КАТАЛИТИЧЕСКОЕ КАРБОКСИЛИРОВАНИЕ ВОЛОКОН ЦЕЛЛЮЛОЗЫ В НЕПРЕРЫВНОМ ПРОЦЕССЕ С МНОГОКРАТНЫМИ ДОБАВЛЕНИЯМИ КАТАЛИЗАТОРА, ВТОРИЧНОГО ОКИСЛИТЕЛЯ И ОСНОВАНИЯ В ДВИЖУЩУЮСЯ ЖИДКУЮ МАССУ ВОЛОКОН ЦЕЛЛЮЛОЗЫ

FIELD: chemistry. SUBSTANCE: invention relates to the production of carboxylated fibre. The method includes catalytic carboxylation of cellulose fibres in at least two stages of catalytic carboxylation, located successively, in which the primary catalyst, the secondary oxidating agent, and, if necessary, an agent for pH regulation are added in the beginning of each stage. EFFECT: invention makes it possible to increase a level of carboxylation with effective expenditures. 11 cl, 1 dwg, 8 tbl, 5 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 531 280 C2 (51) МПК C08B 15/02 (2006.01) C08B 1/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2012141503/05, 28.09.2012 (24) Дата начала отсчета срока действия патента: 28.09.2012 (72) Автор(ы): Уирэварна Ананда С. (US) (73) Патентообладатель(и): ВЕЙЕРХОЙЗЕР НР КОМПАНИ (US) Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 10.04.2014 Бюл. № 10 R U 30.09.2011 US 61/541,753 (45) Опубликовано: 20.10.2014 Бюл. № 29 2001125941 A, 27.06.2003. WO 2000050462 A1, 31.08.2000. EA 000896 B1, 26.06.2000 2 5 3 1 2 8 0 R U (54) КАТАЛИТИЧЕСКОЕ КАРБОКСИЛИРОВАНИЕ ВОЛОКОН ЦЕЛЛЮЛОЗЫ В НЕПРЕРЫВНОМ ПРОЦЕССЕ С МНОГОКРАТНЫМИ ДОБАВЛЕНИЯМИ КАТАЛИЗАТОРА, ВТОРИЧНОГО ОКИСЛИТЕЛЯ И ОСНОВАНИЯ В ДВИЖУЩУЮСЯ ЖИДКУЮ МАССУ ВОЛОКОН ЦЕЛЛЮЛОЗЫ (57) Реферат: Изобретение относится к производству первичный катализатор, вторичный окисляющий карбоксилированного волокна. Способ включает агент и, при необходимости, агент для каталитическое карбоксилирование волокон регулировки pH добавляют в начале каждой целлюлозы по меньшей мере на двух ступенях ступени. Изобретение позволяет повысить каталитического карбоксилирования, уровень карбоксилирования при эффективных расположенных последовательно, в которые затратах. 10 з.п. ф-лы, 1 ил., 8 табл., 5 пр. Стр.: 1 C 2 C 2 Адрес для переписки: 129090, Москва, Проспект Мира, д. 6, ППФ "ЮС", С.В.Ловцову 2 5 3 1 2 8 0 (56) Список документов, ...

ЦЕЛЛЮЛОЗНАЯ КОМПОЗИЦИЯ СО СПОСОБНОСТЬЮ УСТРАНЕНИЯ НЕПРИЯТНОГО ЗАПАХА

FIELD: pulp industry.SUBSTANCE: invention relates to fluff pulp with improved ability to eliminate unpleasant odour, as well as methods for production of fluff pulp. Fluff pulp contains bleached kraft fibre having weighted average fibre length of about 2 mm, copper number of less than about 7, carboxyl group content of more than about 3.5 meq/100 g, whiteness by ISO of at least 80, viscosity from about 2 cP to about 9 cP, and content of copper ions from about 0.2 parts per million to about 50 parts per million in terms of weight of bleached kraft fibre.EFFECT: technical result is improved ability to eliminate unpleasant smell of fluff pulp.26 cl, 4 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 729 701 C1 (51) МПК D21C 9/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК D21C 9/163 (2020.02); D21C 9/001 (2020.02); D21C 9/00 (2020.02) (21)(22) Заявка: 2019128706, 12.03.2018 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): ИНТЕРНЭШНЛ ПЭЙПА КАМПАНИ (US) Дата регистрации: 11.08.2020 21.03.2017 US 62/474,515 (45) Опубликовано: 11.08.2020 Бюл. № 23 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 13.09.2019 (86) Заявка PCT: 2 7 2 9 7 0 1 R U (87) Публикация заявки PCT: WO 2018/175135 (27.09.2018) C 1 C 1 US 2018/021991 (12.03.2018) 2 7 2 9 7 0 1 (56) Список документов, цитированных в отчете о поиске: EP 2527531 B1, 30.07.2014. WO 2014140940 A2, 18.09.2014. RU 2608686 C2, 23.01.2017. WO 2010138941 A2, 02.12.2010. WO 2001029309 A1, 26.04.2001. Приоритет(ы): (30) Конвенционный приоритет: R U 12.03.2018 (72) Автор(ы): ФРОАСС, Питер М. (US) Адрес для переписки: 129090, Москва, пр-кт Мира, 6, ООО "Патентно-правовая фирма "ЮС" (54) ЦЕЛЛЮЛОЗНАЯ КОМПОЗИЦИЯ СО СПОСОБНОСТЬЮ УСТРАНЕНИЯ НЕПРИЯТНОГО ЗАПАХА (57) Реферат: Изобретение относится к распушенным 3,5 мэкв/100 г, белизну по ISO по меньшей мере целлюлозам с улучшенной способностью 80, вязкость от приблизительно 2 спз до устранения ...

СПОСОБ РЕГУЛИРОВАНИЯ ХИМИЧЕСКОГО БАЛАНСА ЦЕЛЛЮЛОЗНОГО ЗАВОДА

Improvement with the manufacture of the paper pulp.

Process anti-pollutant of bleaching of the paper pulp.

PROCEDURE FOR THE REDUCTION OF REMAINDER CHLORINE IN LAUBHOLZ-ZELLSTOFF

PROCEDURE FOR THE PRODUCTION OF CHLORINE DIOXIDE.

Novel method of bleaching of lignocellulosic pulp using persulphate

Process for delignifying and bleaching chemical pulp

Process for delignifying and bleaching chemical pulp Abstract: The delignification and bleaching of chemical pulp by a bleaching stage, in which the chemical pulp is reacted first with chlorine dioxide and, after reaction of the chlorine dioxide, is further reacted without intermediate washing with hydrogen peroxide in the presence of a molybdate or tungstate, permits the production of chemical pulp having a whiteness of at 1o least 89.5%, having improved stability to yellowing and reduced oxidative damage.

BLEACHING WOOD PULP

PULP SOURING PROCESS ENHANCING CONSERVATION OF SPECIFIC BLEACHING AGENT RESIDUALS

There is disclosed a process for souring chemical or mechanical cellulosic pulp using carbon dioxide to obtain proper acidification of the pulp slurry. The souring is performed after a single or a multistage bleaching sequence ending with sodium hypochlorite, calcium hypochlorite or hydrogen peroxide or the like in a common process for the preparation of paper pulp. The use of CO2 permits bleaching to continue because CO2 does not destroy the bleaching residuals remaining from the single or last bleaching stages.

TREATMENT OF PULP

CHLORINE DIOXIDE GENERATION

Chlorine dioxide production is integrated with a pulp mill system. A gaseous mixture of chlorine dioxide and chlorine is formed in a chlorine dioxide generating zone, an aqueous solution of chlorine dioxide wherein no more than about 10% of the available chlorine of the aqueous solution is provided by chlorine and the remainder of the available chlorine is provided by the chlorine dioxide is formed from the gaseous mixture, the aqueous chlorine dioxide solution is used to bleach cellulosic fibrous material pulp, hydrogen chloride is formed by reaction between the chlorine separated from the mixture and hydrogen and the hydrogen chloride is forwarded to the chlorine dioxide generating zone for use in forming the gaseous mixture of chlorine dioxide and chlorine.

METHOD FOR BLEACHING PULP WITH CHLORINE DIOXIDE

A method of treating pulp with chlorine dioxide according to which clorine dioxide is mixed in the pulp and the mixture thus produced is fed into a treatment vessel (42) in which the chlorine dioxide treatment is carried out at a temperature of 40-90 ~C and at a pH of 1.5-6.5. The pulp is discharged from the treatment vessel in a closed space straight to a chlorine dioxide stage washer (44) ensuring that no detrimental amounts of residual dioxide remain in the pulp flowing to the washer.

METHOD OF REDUCING WASTE STREAM POLLUTANTS BY THE CONTROL AND SEPARATION OF WASTE CONTAMINANTS A MULTI-STAGE CELLULOSIC BLEACHING SEQUENCE

METHOD OF CONTROLLING THE CHEMICAL BALANCE OF A PULP MILL

The present invention related to a method to optimise the chemical balance at a sulfate pulp mill, which produces at least pulp bleached with chlorine dioxide and has a chlorine dioxide plant using at least chlorate, methanol and sulfuric acid for making chlorine dioxide. The method comprises at least the following steps: a), gases from the mill's concentrated non-condensable gas system are incinerated in order to form a gas containing sulfur dioxide, which is treated to produce concentrated sulfuric acid, and b), raw methanol from the mill processes is purified to produce methanol, and c), side streams containing sodium compounds and/or sulfur compounds produced by mill processes are used as make-up chemicals, wherein the production of chlorine dioxide uses the sulfuric acid produced in step a) and methanol purified in step b), with a sulfuric acid concentration of 94-99%, preferably 95-98%, and using in step c) sesquisulfate or sodium sulfate produced during the production of chlorine ...

OXIDATIVE METHOD

The present invention relates to a method of generating chlorine dioxide from chlorite salts in the presence of an iron ion-containing complex, a method of treating a substrate with a chlorine-containing oxidant in the presence of an iron ion-containing complex and related aqueous media, kits and compositions.

PROCESS FOR THE PRODUCTION OF A TREATED PULP, TREATED PULP, AND TEXTILE FIBRES PRODUCED FROM THE TREATED PULP

The present invention relates to a process for the production of treated pulp comprising the steps of: i. providing a fibre source material; ii. subjecting the fibre source material to pre-hydrolysis; iii. subjecting the pre-hydrolysed fibre source material to alkaline chemical pulping process, preferably kraft pulping, to obtain an alkaline pulp; iv. optionally adjusting the pH of the obtained pulp to above pH 9; v. subjecting the alkaline pulp to a bleaching sequence comprising contacting the pulp with ozone (Z) in alkaline conditions to obtain a treated pulp. The invention also relates to a treated pulp obtained, textile fibres produced from the treated pulp, textile products comprising the textile fibres and to the use of the treated pulp.

CHLORINE-FREE PROCESS FOR BLEACHING PULP

... - 18 - Case 156-7131 A chlorine-free method for bleaching chemical pulps, particularly kraftpulp, uses a first step of treating the pulp with a hemicellulose acting enzyme of a microorganism. Subsequently, the treated pulp is extracted, treated with chlorine dioxide, re-extracted and retreated with chlorine dioxide to result in a brightness level of at least 88. 6300/DH/Gro ...

PROCESS FOR BLEACHING CHEMICAL PULP FOR PAPER MANUFACTURING

A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a peroxide, and at least one reaction catalyst selected from the group consisting of oxoacids of elements of Groups IV, V and VI and salts of these acids. Formation of organic chlorine compounds as by-products is suppressed by decreasing the amount of chlorine dioxide used in the ECF bleaching process in the first stage, and thus environmental toxicity in the waste water discharged from the bleaching process is decreased. Chemical pulp having a high degree of brightness is economically produced because increase in the production capacity is not required at all or suppressed to the minimum, and the investment cost is reduced to the minimum when the bleaching with chlorine in the first stage is converted into the bleaching with chlorine dioxide which is an ECF bleaching process.

METHOD FOR TREATMENT OF PULP

The present invention relates to a method for treatment of pulp in an alkali ne pulping process of chemical pulp. The pulp is treated in a chlorine dioxide stage comprising successive preferably a chlorine dioxide step and an acid treatment step at a pH of 2 - 5 and a temperature of over 80.degree.C. The conditions in the chlorine dioxide step are such that the hexenuronic acid groups in the pulp do not react with chlorine dioxide.

Procédé de blanchiment.

Procédé d'activation du pouvoir oxydant des solutions de chlorite.

Procédé de blanchiment.

Solution aqueuse acide de chlorite et procédé pour sa préparation.

Procédé de blanchiment de pâtes de cellulose au sulfite ou au sulfate

Produit stable pour le blanchiment de matières, notamment de matières textiles, et procédé pour sa fabrication.

Procédé de délignification et/ou de blanchiment de fibres cellulosiques

Procédé pour le blanchiment de substances organiques par oxydation à l'aide de solutions de chlorites.

Method for making paper from bagasse and waste liquid alkali recovery and treatment method

Process allowing to avoid corrosions

Chlorine dioxide prodn. as part of paper paste mfr. - by reacting sodium chlorate with sodium sulphate and hydrochloric acid and removing the salt (BR270776)

METHOD FOR REDUCING the AGENTS OF POLLUTION OF the WASTE CURRENTS BY the LIMITATION AND the SEPARATION OF the WASTE IMPURITIES Of a CELLULOSE SEQUENCE OF BLEACHING HAS MULTIPLE STAGES

Enhanced bleaching of wood pulp suspensions - contg. dissolved organic cpds. using addition first of chlorine di:oxide and chlorine then of chlorine alone

Process for the oxidation of substances by chlorite solutions

METHOD FOR BLEACHING PULP

Improvements with the processes of bleaching

Multistage bleaching of lignocellulose pulp - using chlorine di:oxide under acid conditions in first stage, increasing reaction rate and effectiveness

PROCEEDED OF BLEACHING OF PASTES PAPER HAS CHEMICAL

La présente invention concerne un procédé de blanchiment de pâtes à papier chimiques suivant lequel les pâtes, après cuisson et éventuellement préblanchiment, sont soumises à au moins un traitement au dioxyde de chlore en présence d'oxygène.

PROCEDE DE RECYCLAGE POUR PAPETERIE

L'invention concerne un procédé de production de pâte cellulosique et de blanchiment. Le procédé comporte deux cycles, dont l'un est un cycle de liqueur du lessiveur et l'autre un cycle de soufre. Le cycle de liqueur du comprend les étapes consistant à lessiver une charge cellulosique manière à former une pâte, à séparer la pâte et à la blanchir en au moins une étape avec du dioxyde de chlore, à évaporer et brûler la liqueur résiduaire restante de manière à former un salin, à dissoudre le salin pour une liqueur verte et à utiliser la liqueur verte, après recaustification, comme au moins une portion de la charge de départ pour l'étape de lessivage. Le cycle du soufre selon la présente invention utilise une partie de la liqueur verte du de la liqueur du lessiveur. La liqueur verte est carbonatée pour former un bicarbonate qui est ensuite dépouillé de H2S. Le H2S est transformé en H2SO4 et utilisé comme charge de départ pour un générateur de dioxyde de chlore. Le générateur de dioxyde de chlore ...

PROCESS FOR REDUCING FLUORESCENCE IN PULP

METHOD FOR TREATING LIQUID FLOWS AT A CHEMICAL PULP MILL

The invention relates to a method of treating liquid flows at a chemical pulp mill comprising at least an alkaline cooking process utilizing cooking liquor for producing pulp, brown stock treatment with essentially closed liquid cycles, a pulp bleaching plant using ECF-bleaching wherein chloride- containing effluents are generated, a chemical recovery plant comprising a causticizing plant and chemical recovery boiler plant, and effluent purification. A characteristic feature of the method is that chloride-containing effluents of the bleaching plant are introduced to the effluent purification where they are treated for decreasing the organic matter content thereof, at least 20 % of the purified effluent is led back to a pulp mill process, purified effluent is used in at least one stage of causticizing as raw water source so that the chloride-containing liquid formed in the process stage is a weak white liquor fraction that is led to the recovery boiler plant as a smelt dissolving liquid ...

ENZYMATIC BLEACHING OF PAPER PULP

The use of a GH78 enzyme in the bleaching of pulp for preparing paper materials, such as paper, linerboard, corrugated paperboard, tissue, towels, corrugated containers and boxes.

СПОСОБ ОБРАБОТКИ ЦЕЛЛЮЛОЗНОЙ МАССЫ С ОТБЕЛИВАНИЕМ ЦЕЛЛЮЛОЗЫ

Способ касается обработки целлюлозной массы с отбеливанием целлюлозы. Целлюлозную массу обрабатывают по меньшей мере на стадиях озона, диоксида хлора или щелочения и затем промывают в моечном устройстве, имеющем значение Е10 по меньшей мере 3, предпочтительно выше 4. Промывочную жидкость вводят в моечное устройство противоточно целлюлозной массе и ее моют так, что промывочная жидкость является фильтратом, полученным из самого моечного устройства. Количество циркулирующей промывочной жидкости составляет 1,5-3,5 т/вст целлюлозной массы. После чего целлюлозную массу моют жидкостью, введенной снаружи моечного устройства. Количество указанной жидкости таково, что фактор разбавления в последней промывке менее 1 т/вст. Полное количество промывочной жидкости, используемой в моечном устройстве, таково, что фактор разбавления составляет более 0 т/вст. 4 з.п. ф-лы, 3 ил.

ЦЕЛЛЮЛОЗА И БУМАГА ПОВЫШЕННОЙ ЯРКОСТИ

... 1. Способ изготовления целлюлозы и/или бумажной основы, содержащий контакт некоторого количества волокон крафт-целлюлозы в растворе с концентрацией от 7 до 15% по меньшей мере с одним оптическим отбеливателем после последней стадии беления/экстрагирования с помощью хлорного отбеливателя. ! 2. Способ изготовления целлюлозы и/или бумажной основы, содержащий контакт некоторого количества волокон крафт-целлюлозы в растворе по меньшей мере с одним оптическим отбеливателем после последней стадии беления/экстрагирования с помощью хлорного отбеливателя, отличающийся тем, что упомянутый по меньшей мере один оптический отбеливатель поглощает свет с первой длиной волны и излучает свет с второй длиной волны, которая больше первой длины волны. ! 3. Способ по п.1 или 2, отличающийся тем, что контакт осуществляют до ящика смешивания/напорного ящика машины. ! 4. Способ по п.1 или 2, отличающийся тем, что с волокнами контактирует от 1 до 15 фунтов оптического отбеливателя на тонну. ! 5. Способ по п.1 или ...

СПОСОБ ОТБЕЛКИ ЦЕЛЛЮЛОЗЫ

... 1. Способ отбелки целлюлозы, включающий стадии:- обеспечение водной среды, содержащей от 1% до 40% по массе целлюлозы, выраженной на основании воды в водной среде (100%);- добавление алкилфосфоновой кислоты аминокислоты или ее соли, имеющей формулу, выбранную из:А-(В); иА-(В);где Аи Аимеют формулу:А=HOOC-A-NH; иА=HOOC-C(NH)(R)(R')где B представляет собой алкилфосфоновокислотную группировку, имеющую от 1 до 6 атомов углерода в алкильной группе, и у представляет собой целое число от 1 до 10; А независимо выбран из С-Слинейных, разветвленных, циклических и ароматических углеводородных радикалов, возможно замещенных одной или более С-Слинейными, разветвленными, циклическими и/или ароматическими углеводородными группами, которые (радикалы и/или группы) могут быть замещены одной или более группировками ОН, COOH и/или NH; R и R' независимо выбраны из С-Слинейных, разветвленных, циклических и ароматических углеводородных радикалов, возможно замещенных одной или более С-Слинейными, разветвленными ...

VERFAHREN ZUR GASPHASE-DELIGNIFIZIERUNG VON ZELLSTOFF

VERFAHREN ZUR REDUZIERUNG VON RESTCHLOR IN LAUBHOLZ-ZELLSTOFF

OZONE TREATMENT OF WITH CHLORINE DIOXIDE/CCHLORINE OF CHLORINIERTER PULPE.

PROCEDURE FOR THE PRODUCTION OF COMPOSITIONS FOR THE CONVERSION FOR LYOCELL FIBERS

PROCEDURES FOR THE RECOVERY OF WASTE PAPER WITH MICROENCAPSULATED COMPONENTS

PROCEDURE FOR BLEACHING LIGNOCELLULOSE CONTAINING MATERIAL.

BLEACH FROM CHEMICAL CELLULOSE AND TREATMENT WITH A COMPLEXING AGENT

Process for the bleaching of chemical paper pulps

KRAFT MILL RECYCLE PROCESS

PROCESS AND APPARATUS FOR BLEACHING OF PULP

PRODUCTION OF CHLORINE DIOXIDE AND INTEGRATION WITH EFFLUENT-FREE PULP MILL

A continuous cyclic process for the production of chlorine dioxide includes the formation of a gaseous mixture of chlorine dioxide, chlorine and steam from an aqueous reaction medium containing sodium chlorate and hydrochloric acid at an activity below about 1N. Chlorine dioxide is recovered from the gaseous mixture. Sodium chloride formed in the reaction is deposited in the reaction vessel and is removed therefrom. The continuous cyclic process forms part of an effluent dioxide is used as a bleaching chemical and from which sodium chloride is removed. Sodium hydroxide solution used in caustic extraction of the pulp in the bleach plant is formed by electrolysis of an aqueous solution sodium chloride, which may be formed from that removed from the chlorine dioxide generator and/or recovered from the pulp mill. Sodium chlorate feed for the chlorine dioxide generator is formed by electrolysis of aqueous sodium chloride solution, which may be formed from that removed from the chlorine dioxide ...

SYSTEM AND METHOD FOR GAS PHASE PULP BLEACHING

Wood pulp is bleached with chlorine dioxide gas. Shredded or fluffed pulp is exposed to a controlled amount of chlorine dioxide gas for a time period sufficient to obtain the required pulp brightness. The amount of unused chlorine dioxide gas is continuously monitored. The controlled amount of chlorine dioxide gas fed to the bleaching system is automatically adjusted in response to charges in the amount of unused chlorine dioxide gas leaving the bleaching system.

BLEACHING STILBENE YELLOW DYED WOOD PULP

... 10 199 P 92 4636 (a) CANADA BLEACHING STILBENE YELLOW DYED WOOD PULP Chlorine dioxide is a specific bleaching agent for stilbene yellow dye which has been used to dye paper stock. Chlorine dioxide may be used in amounts as low as 0.25% based on the oven dry weight of the pulp fiber.

METHOD FOR PREPARING NONWOOD FIBER PAPER

Paper comprised solely of a nonwood fiber mix is demonstrated to meet the technical physical specifications of commercially produced papers made from wood. The esthetically impressive paper meets nearly every technical specification of commercially produced paper.

USE OF CHEMICAL PULP MILL STEAM STRIPPER OFF GASES CONDENSATE AS REDUCING AGENT IN CHLORINE DIOXIDE PRODUCTION

Steam stripper off gas from chemical pulp mills, for example kraft or sulphite pulp mills is rich in methanol and totally reduced sulphur (TRS) compounds. This gaseous stream is usually burned to avoid further handling of this TRS-rich, odorous stream. We found that once this gaseous stream is condensed, it can be used as a reducing agent in the chlorine dioxide generator, in place of purchased methanol. Surprisingly, we found that, in addition to the methanol component, the TRS components act as reducing agents during the production of chlorine dioxide or, at the very least, do not consume chlorine dioxide. The use of this stream in the ClO2 generator will allow pulp mills to reduce or eliminate the consumption of purchased methanol while providing a new approach to deal with TRS compounds in the chlorine dioxide generator rather than employing a dedicated TRS incinerator or any other combustion device.

METHOD FOR PULP BLEACHING

A process for pulp bleaching is disclosed wherein an amino acid phosphonic acid is used together with a bleaching agent, pH regulants and pH buffers for pulp treatment in an aqueous medium. The bleaching agent can be represented by oxidative and reductive bleaching agents. The oxidative bleach treatment is conducted in alkaline medium whereas the reductive treatment is conducted in mildly acid medium.

METHOD FOR PHOTO-ASSISTED CHLORINE DIOXIDE BLEACHING OF PULP

The invention relates to method for photo-assisted chlorine dioxide bleaching of pulp. It includes the following steps: (1) Photocatalytic pretreatment; (2) Chlorine dioxide bleaching. The invented process starts with the unbleached pulp being treated by photocatalytic process to remove lignin. By controlling the light application time and doses of chemicals, one makes sure that lignin removal is over 70% prior to the accelerated degradation of carbohydrates. The chlorine dioxide charge is decreased as compared with the conventional elemental chlorine free (ECF) bleaching. It greatly improves the pulp bleachability and reduces the amount of adsorbable organic halogens (AOX) in the bleach plant wastewater. After photocatalytic pretreatment of the pulp, chlorine dioxide dosage saving is more than 50% and the AOX formation is reduced by 50%-70%.

METHOD FOR PHOTO-ASSISTED CHLORINE DIOXIDE BLEACHING OF PULP

The invention relates to method for photo-assisted chlorine dioxide bleaching of pulp. It includes the following steps: (1) Photocatalytic pretreatment; (2) Chlorine dioxide bleaching. The invented process starts with the unbleached pulp being treated by photocatalytic process to remove lignin. By controlling the light application time and doses of chemicals, one makes sure that lignin removal is over 70% prior to the accelerated degradation of carbohydrates. The chlorine dioxide charge is decreased as compared with the conventional elemental chlorine free (ECF) bleaching. It greatly improves the pulp bleachability and reduces the amount of adsorbable organic halogens (AOX) in the bleach plant wastewater. After photocatalytic pretreatment of the pulp, chlorine dioxide dosage saving is more than 50% and the AOX formation is reduced by 50%-70%.

ACTINOMADURA XYLANASE SEQUENCES AND METHOD OF USE

The isolation and cloning of Actinomadura flexuosa xylanases having a molecular weight of 35 kDa and 50 kDa are described. These xylanases are thermostable and useful in biobleaching of wood pulp.

PROCESS FOR THE PRODUCTION OF CHLORINE DIOXIDE

PROCESS FOR BLEACHING CHEMICAL PULP FOR PAPER MANUFACTURING

A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a peroxide, and at least one reaction catalyst selected from the group consisting of oxoacids of elements of Groups IV, V and VI and salts of these acids. Formation of organic chlorine compounds as by-products is suppressed by decreasing the amount of chlorine dioxide used in the ECF bleaching process in the first stage, and thus environmental toxicity in the waste water discharged from the bleaching process is decreased. Chemical pulp having a high degree of brightness is economically produced because increase in the production capacity is not required at all or suppressed to the minimum, and the investment cost is reduced to the minimum when the bleaching with chlorine in the first stage is converted into the bleaching with chlorine dioxide which is an ECF bleaching process.

BLEACHING OF CHEMICAL PULP AND TREATMENT WITH A CHELATING AGENT

The invention relates to a process for the bleaching of chemical pulp, wherein the pulp is delignified and/or bleached with chlorine dioxide or with a combination of chlorine dioxide and a per-compound, and additionally the pulp is chelated in order to bind heavy metals, such as Fe, Mn and/or Cu, to a chelate complex. The chelate complex is selected from the group made up of Nbis-¢(1,2-dicarboxylethoxy)-ethyl!-amine, N-bis¢(1,2-dicarboxylethoxy)-ethyl!-aspartic acid and N-tris-¢(1,2-dicarboxylethoxy)-ethyl!-amine, and the alkali metal and earth-alkali metal salts of these, and the chelating treatments are carried out simultaneously by combining the chelating chemical with the pulp in the same bleaching stage as chlorine dioxide.

BLEACHING OF CHEMICAL PULP AND TREATMENT WITH A CHELATING AGENT

The invention relates to a process for the bleaching of chemical pulp, where in the pulp is delignified and/or bleached with chlorine dioxide or with a combination of chlorine dioxide and a per- compound, and additionally the pulp is chelated in order to bind heavy metals, such as Fe, Mn and/or Cu, to a chelate comple x. The chelate complex is selected from the group made up of N-bis-[(1,2-dicarboxylethoxy)-ethyl]-amine, N- bis[(1,2dicarboxylethoxy)-ethyl]-aspartic acid and N-tris-[(1,2-dicarboxylethoxy)-ethyl]-amine, and the alkali metal and earth- alkali metal salts of these, and the chelating treatments are carried out simultaneously by combining the chelating chemical with the pulp in the same bleaching stage as chlorine dioxide.

Method for bleaching pulp

Process of activation of the chlorite solutions

Improvements with the bleaching of cellulosic feedstocks

PROCEDE PERFECTIONNE DE BLANCHIMENT DE MATIERE FIBREUSE CELLULOSIQUE TELLE QUE PATE DE BOIS

Procédé perfectionné de blanchiment de matière fibreuse cellulosique telle que pâte de bois. Selon le procédé, on fait le blanchiment en suspension aqueuse, en plusieurs étapes, au moyen de dioxyde du chlore et de chlore, le dioxyde de chlore représentant 20 à 95 % de chlore disponible total utilisé. Apres une première étape, où l'on utilise une solution aqueuse de dioxyde de chlore contenant ou non en outre du chlore, on soumet la suspension, qui contient de la matière organique dissoute, par exemple au taux de 3,5 à 6,5 % en poids, à une seconde étape de blanchiment avec du chlore, sans lavage entre les deux étapes de blanchiment. Application à l'industrie de la pâte à papier.

Bleached cellulose fibre pulp prodn. - with sulphur recovery and recycle, with reduced chemical requirements and pollution

METODO DE BRANQUEAMENTO DE POLPA DE PAPEL

PROCESS FOR BLEACHING LIGNOCELLULOSE-CONTAINING NON-WOOD PULP

The present invention refers to a process for bleaching lignocellulose-containing pulp comprising pulp obtainable from lignocellulose-containing materials selected from the group consisting of non-wood with a peroxide-containing compound, where the pulp prior to the bleaching is treated with chlorine dioxide, characterised in that the pulp after the treatment with chlorine dioxide is treated in a separate stage with a chelating agent at a pH up to about 2.9 and washed between the chlorine dioxide treatment and chelating agent treatment.

METHOD FOR TREATING LIQUID FLOWS AT A CHEMICAL PULP MILL

A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, treatment of brown stock generated in the cooking, a bleaching plant using ECF-bleaching, in which chloride-containing effluents are formed, an effluent purification plant for treating bleaching plant effluents and other effluents generated at the mill. At least a portion of the effluents is returned after the purification to the pulp production line as source of process water. More than one treatment line is arranged at the effluent purification plant for the mill effluents and effluents with different chemical compositions are purified in separate treatment lines so that the quality and amount of purified water from each treatment line is suitable for use in a stage or stages of the production process, whereto purified effluent is returned.

Xylanase treatment of chemical pulp

The present invention discloses methods of bleaching chemical pulp that use xylanase enzymes after chemical bleaching. The method comprises the steps of carrying out a chlorine dioxide stage to produce a partially bleached pulp, treating the partially bleached pulp with a xylanase enzyme, optionally in the presence of oxygen and hydrogen peroxide, in a mild extraction stage, then bleaching the pulp with a second chlorine dioxide stage. The method allows the mill to decrease the usage of sodium hydroxide or other alkali, while decreasing the use of chlorine dioxide, and possibly improving the yield and strength of the pulp, while maintaining a similar level of bleached brightness of the pulp. The pulp bleaching method of the present invention may be performed in a pulp mill as part of a complex pulp bleaching process.

ODOR CONTROL PULP COMPOSITION

The present technology is directed to fluff pulps with improved odor control as well as methods of making such fluff pulps. A fluff pulp is provided that includes a bleached kraft fiber and a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. The bleached kraft fiber includes a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of more than about 3.5 meq/100 grams; an ISO brightness of at least 80; and a viscosity from about 2 cps to about 9 cps.

Process for the production of chlorine dioxide

A process for the production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, mineral acid and a reducing agent in such proportions that chlorine dioxide is produced in a reaction medium which is maintained at a temperature of from about 50 °C to about 100 °C and at an acidity within a range of from about 5 N to about 11 N. The reaction medium is subjected to subatmospheric pressure sufficient for evaporating water, a mixture of chlorine dioxide, oxygen and water vapour being withdrawn from an evaporation zone in the reaction vessel, and alkali metal sulfate being precipitated in a crystallization zone in the reaction vessel. As the reducing agent hydrogen peroxide is used.

METHOD AND APPARATUS FOR BLEACHING PULP

ЦЕЛЛЮЛОЗА И БУМАГА ПОВЫШЕННОЙ ЯРКОСТИ

Способ касается изготовления целлюлозы и/или бумажной основы и может быть использован в целлюлозно-бумажной промышленности. Сначала осуществляют полное беление/экстракцию волокон крафт-целлюлозы хлорным агентом. После чего волокна промывают и подвергают контактированию в растворе с по крайней мере одним оптическим отбеливателем (OO) до ящика смешивания и напорного ящика машины. Волокна в растворе имеют консистенцию от 7 до 15%, рН раствора во время контакта OO волокнами составляет от 3,5 до 5,5, температура контакта составляет от 60 до 80°С и время контакта от 0,5 до 6 час. Дополнительный контакт OO с волокнами осуществляют в устройстве для нанесения покрытия или в клеильном прессе. Контактирование можно осуществлять на этапе хранения как при высокой плотности, так и при низкой плотности волокон крафт-целлюлозы, а также на этапе облагораживания. Техническим результатом является повышение белизны и яркости волокон при использовании меньшего количества OO. 18 з.п. ф-лы, 11 ил., 12 табл.

СПОСОБ ОТБЕЛКИ ХИМИЧЕСКОЙ ЦЕЛЛЮЛОЗЫ

Изобретение относится к отбеливанию химической целлюлозы. Способ, в котором начальная отбелка целлюлозы включает первую обработку диоксидом хлора (D0), включающую также добавление щелочи в целлюлозу после добавления диоксида хлора и последующую щелочную обработку с кислородом и пероксидом водорода (ЕОР), причем эти стадии отделены друг от друга стадией промывки. Кроме того, способ включает обработку целлюлозы для уменьшения содержания переходных металлов в целлюлозе до указанной обработкой пероксидом, в соответствии с чем начальная отбелка содержит последовательность D0N EOF. При этом рН целлюлозы устанавливают на значение от 8 до 11 до указанной стадии промывки указанным добавлением щелочи, таким образом, органические вещества в целлюлозе растворяются и будут удалены из целлюлозы на указанной стадии промывки как фильтрат, содержащий также большую часть образованных хлоридов, причем не допускается поступление этого фильтрата в систему утилизации, и содержание хлоридов в фильтрате со стадии ...

СПОСОБ ПОЛУЧЕНИЯ ВОЛОКОН ДРЕВЕСНОЙ МАССЫ С УВЕЛИЧЕННЫМ ОБЪЕМОМ, ПОЛУЧАЕМЫЕ ВОЛОКНА ДРЕВЕСНОЙ МАССЫ И СОДЕРЖАЩИЕ ИХ ИЗДЕЛИЯ

Изобретение относится к способам превращения в волокнистую массу неочищенного древесного материала, такого как древесные стружки, с получением волокон древесной массы, имеющих увеличенный удельный объем, а также к отбеливанию полученных в результате волокон древесной массы с получением беленых волокон древесной массы, имеющих увеличенный удельный объем. Указанные волокна древесной массы и беленые волокна древесной массы могут содержаться или применяться в разнообразных изделиях, таких как многослойный покрытый картон, распушенная древесная масса и т.д. 4 н. и 55 з.п. ф-лы, 2 пр., 2 табл., 8 ил.

СПОСОБ ДЕЛИГНИФИКАЦИИ И ОТБЕЛКИ ЦЕЛЛЮЛОЗЫ

... 1. Способ делигнификации и отбелки целлюлозы со ступенью отбелки, на которой ! а) на первой стадии целлюлозу в водной смеси, содержащей целлюлозу в количестве от 3 до 30 мас.%, подвергают при температуре в пределах от 50 до 150°С и при значении рН в пределах от 2 до 7 взаимодействию с диоксидом хлора в количестве, соответствующем коэффициенту Каппа в пределах от 0,02 до 0,25, до превращения более 90% диоксида хлора и ! б) полученную на первой стадии смесь затем без отделения ее компонентов на второй стадии подвергают при температуре в пределах от 50 до 150°С дальнейшему взаимодействию с пероксидом водорода, используемым в количестве от 0,1 до 5 мас.%, в присутствии молибдата в количестве, которое соответствует содержанию молибдена от 10 до 2000 част./млн, или в присутствии вольфрамата в количестве, которое соответствует содержанию вольфрама от 200 до 10000 част./млн, при этом все количества в каждом случае указаны в пересчете на массу используемой сухой целлюлозы. ! 2. Способ по п.1, отличающийся ...

СПОСОБ ОТБЕЛКИ БИСУЛЬФИТНОЙ ЦЕЛЛЮЛОЗЫ

Изобретение относится к целлюлозно-бумажной промышленности и может быть использовано для получения из небеленой бисульфитной целлюлозы растворимой беленой и облагороженной целлюлозы, предназначенной для химической переработки, в частности для нитрования. Согласно способу отбелке подвергают жесткую небеленую бисульфитную целлюлозу повышенного выхода с высокой массовой долей лигнина более 6%, проводят делигнификацию целлюлозы пероксидом водорода в присутствии катализатора молибдата натрия при концентрации массы 10% с последующим продолжением делигнификации в щелочной среде, затем отбелку целлюлозы хлоритом натрия в две ступени с промежуточным щелочением. Делигнификацию проводят в две ступени: на первой ступени в кислой среде при температуре 70-75°С в течение 120-150 мин, расходе H2O24,5-5,0%, H2SO40,5-0,6%, Na2MoO40,15-0,35% от массы абсолютно сухой целлюлозы; на второй ступени в щелочной среде при температуре 80-85°С в течение 90-120 мин, расходе H2O21,5-2,0%, NaOH 1,5-2,0%, Na2SiO32,5-3,0% ...

VERFAHREN ZUM BLEICHEN VON ABFALLPAPIER-GANZZEUG

Delignification and bleaching of pulp with alkali chlorite - by adding chlorite before acidification to produce nascent reagent, minimising pollution

In delignification and bleaching pulp suspensions (I) with alkali chloride (II), (I) with pH over 4 treated with (II) soln. then the pH is adjusted to 1-2.8 by adding acid, so that delignification and bleaching reagent is formed in the nascent state in the residual lignin. (I) and (II) are allowed to react for over 2 min. before adding the acid, pref. HC1, or H2S)4, Delignification and bleaching are carried out at 20-80 deg.C and pulp densities of 3-30%. In a multistage process, (I) is treated with (II) soln. and HC1 in the first stage and fed to a first reactor, the prod. from the first reactor is passed through a first washing filter to a second reactor, where it is treated with H202 and aq. NaOH soln. and the prod. is discharged through a second washing filter. This opt. is followed by a third stage in which (II) soln. and HCI are added again and the prod. is discharged from the third reactor through a third washing filter, giving high grade bleached pulp. ADVANTAGE - Pulp of good quality ...

Improvements in the bleaching of cellulosic materials

Cellulosic material is bleached by subjecting it to the action of an aqueous solution, at a pH of about 3-11, containing an alkali or alkaline earth metal persulphate. The process is especially useful for completing the bleaching of material already partially bleached by the customary methods, and is applicable to wood pulp, cotton linters and textile fibres, e.g. of cotton, hemp or regenerated cellulose. Specified chlorites are those of sodium and calcium and specified persulphates are those of sodium and potassium. In examples: (1) to (6), kraft pulps are suspended for 2 hours in an aqueous solution containing sodium chlorite and sodium persulphate, and buffered, the pH and temperature employed being, (1) 5.8 and 78-80 DEG C., (2) 7.5 and 70-80 DEG C., (3) 8.5 and 75-80 DEG C., (4) 9.0 and 24 DEG C., (5) 8.5 and 35-43 DEG C., (6) 9.1 and 60 DEG C., and the pulp is separated and washed; (7) to (9), cotton muslin is immersed an aqueous solution containing sodium chlorite, sodium persulphate ...

Process for bleaching cellulose fibres and textile products prepared therefrom

A process of bleaching cellulosic fibrous material comprises uniformly steeping the material in an aqueous solution of an alkali or alkaline-earth metal chlorite at a pH of 7.0 or above and, after freeing the material from excess chlorite solution, drying without an intermediate washing step. The bleaching bath may be a solution of sodium chlorite at a pH which is adjusted with acetic or formic acid to between 8.0 and 9.5 and may contain sodium bicarbonate, a sulphonated fatty compound, a fatty acid condensation product or a fatty alcohol sulphonate. Prior to bleaching the material may be cleaned. The material may be dried at 80 DEG to 95 DEG C. in a chamber into which hot air is blown. In examples regenerated cellulose staple fibre fleece, sliver and filaments are bleached and the temperature of the bleaching bath is between 20 DEG and 25 DEG C. or 50 DEG and 60 DEG C.

PROCEDURE FOR BLEACHING ZELLULOSEHALTIGEM SYNTHETIC MATERIAL

PROCEDURE FOR BLEACHING ZELLULOSEHALTIGEM SYNTHETIC MATERIAL

VERFAHREN ZUM BLEICHEN VON ZELLULOSEHALTIGEM FASERMATERIAL

VERFAHREN ZUR REGENERIERUNG VON ALTPAPIER MIT MIKROVERKAPSELTEN BESTANDTEILEN

STRENGTHENING OF MECHANICAL PULP BY CHEMICAL TREATMENT

METHODS FOR REDUCING CHLORINE DIOXIDE ASSOCIATED CORROSION

Methods for inhibiting chlorine dioxide associated corrosion in industrial equipment by treating industrial equipment (e.g., pipes, washers and other metallic, e.g., stainless steel surfaces) or process streams in contact with industrial equipment with one or more haloperoxidases, preferably, a chloroperoxidase, in an amount effective to reduce chlorine dioxide associated corrosion.

PROCESS FOR THE PREPARATION OF SULPHIDE-FREE ALKALI LIQUOR

A process is disclosed for the preparation of an essentially sulphide-free alkali liquor starting from an alkali sulphide source. The alkali sulphide source is reacted in alkaline medium with copper (II) oxide and/or copper (I) oxide, optionally with the addition of water, in a mole ratio of oxide to sulphide (calculated as alkali sulphide) (charging) of at least 0.9. The mixture obtained is allowed to react at a temperature of from 30 to 130.degree.C to form hydroxide in an amount equivalent to the amount of sulphide and to precipitate a solid phase consisting essentially of copper (I) sulphide, copper (II) sulphide ox a mixture thereof. Thereafter, the solid phase is separated in a manner known per se to obtain an essentially sulphide-free alkali liquor. The reaction time of the precipitation reaction is adjusted with regard to the charging and temperature selected so that the residual concentration of copper ions in the final alkali liquor is below 1 mmole/litre.

METHOD OF REDUCING WASTE STREAM POLLUTANTS BY THE CONTROL AND SEPARATION OF WASTE CONTAMINANTS A MULTI-STAGE CELLULOSIC BLEACHING SEQUENCE

Case 3317/WJC:lm CONTROL AND SEPARATION OF WASTE CONTAMINANTS FROM A MULTI-STAGE CELLULOSIC BLEACHING SEQUENCE A method is provided for reducing waste stream pollutants by the control and separation of color bodies, COD, BOD and other organics from inorganic chloride pollutants in the aqueous waste effluent of a cellulosic pulp bleaching process containing a sequential chlorination stage (Dc) or mixture (D/C) stage followed by an extraction (E) or oxygen (O) stage, comprising, maintaining the conditions of the Dc or D/C stage such that the pulp product therefrom is low in inorganic chloride and organically bound chlorides and the waste effluent therefrom is low in organic distribution as compared to the subsequent E or O stage waste effluent, passing said waste effluent through an activated bed, under conditions wherein color bodies, COD, BOD and other organics are selectively removed therefrom without significant. effect upon the inorganic chloride content; maintaining conditions in the ...

Modified cellulose from chemical kraft fiber and methods of making and using the same

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

Modified cellulose from chemical kraft fiber and methods of making and using the same

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

Modified cellulose from chemical kraft fiber and methods of making and using the same

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

PROCESS FOR IMPROVING CHLORINE DIOXIDE BLEACHING OF PULP

The invention is directed to a method for increasing brightness of pulp, wherein the method includes: contacting a pulp slurry with chlorine dioxide in a final D (ClO) bleaching stage; and adding a brightening additive to the final D bleaching stage after at least a portion of the chlorine dioxide has been consumed, in an amount sufficient to increase brightness of the pulp; wherein the brightening additive is an inorganic compound chosen from hypochlorous acid, one or more precursor compounds that form hypochlorous acid in said final D bleaching stage, or a mixture thereof. 1. A method for increasing brightness of pulp , said method comprising:{'sub': '2', 'a) contacting a pulp slurry with chlorine dioxide in a final D (ClO) bleaching stage having a pre-selected bleaching time;'}b) adding a brightening additive to said final D bleaching stage after 60% of the final D stage has been completed, in an amount sufficient to increase brightness of the pulp; wherein said brightening additive is an inorganic compound chosen from hypochlorous acid, one or more precursor compounds that form hypochlorous acid in said final D bleaching stage, or a mixture thereof.2. The method according to claim 1 , wherein the final D bleaching stage has a retention time from 30 to 180 minutes.3. The method according to claim 1 , wherein the brightening additive is added during the period of time beginning from about the last 10% of remaining time to the end of the bleaching stage.4. The method according to claim 3 , wherein the brightening additive is added during the period of time beginning from about the last 5% of remaining time to the end of the bleaching stage.5. The method according to claim 4 , wherein the brightening additive is added during the period of time with less than about 5 minutes remaining in the final D bleaching stage.6. The method according to claim 1 , wherein the brightening additive is one or more precursors compounds that form hypochlorous acid chosen from Cl claim ...

Bleaching Trichomes to Remove Proteins

A process for bleaching trichome fibers individualized from a trichome source, such as a leaf and/or a stem, is disclosed. The process of bleaching degrades trichome associated protein. Further, the bleaching processes improves the color of the trichomes, exhibiting CIELAB Color values of L* greater than 87 and b* less than 17 and with less than 0.1% protein by weight of molecular weight greater than 3,500 daltons. 1. A process of treating individualized trichomes to remove proteins , whereby the process comprises:a. selecting a trichome containing biomass,b. individualizing the trichomes from the biomass, wherein the trichomes have a protein content,c. wetting the trichomes,d. reacting the trichomes with a reactant,e. removing the trichomes from the reaction, andf. measuring the protein content of the reacted trichomeswherein protein present in the individualized trichomes is reacted to break down the protein, yielding individualized trichomes with less than 0.1% protein by weight of molecular weight greater than 3,500 daltons.2. The process of wherein the reactant comprises a peracid.3. The process of wherein the peracid is peracetic acid.4. The process of wherein peracetic acid is generated by reacting N claim 3 ,N claim 3 ,N′ claim 3 ,N′-Tetraacetylethylenediamine with hydrogen peroxide.5. The process of wherein the temperature of the reacting step d is maintained above 20° C.6. The process of wherein the pH of the reacting step d is maintained above 5.0.7. The process of wherein the reaction of the reacting step d is for greater than 1 minute.8Stachys byzantina.. The process of wherein the biomass is from9. A process of treating individualized trichomes to remove proteins claim 1 , whereby the process comprises:a. selecting a trichome containing biomass,b. individualizing the trichomes from the biomass, wherein the trichomes have a protein content,c. wetting the trichomes,d. reacting the trichomes with a first reactant,e. reacting the trichomes with a second ...

CROSSLINKED CELLULOSE AS PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY

A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. 1. A method , comprising:crosslinking bleached cellulose fibers within a pulp while the pulp has a consistency greater than or equal to 12%; and a resultant carboxymethyl cellulose (CMC) viscosity greater than or equal to 60 centipoise (cP),', 'a brightness greater than or equal to 75%, and', 'a water retention value (WRV) greater than or equal to 1.1 g/g., 'drying the pulp after said crosslinking, wherein the dried pulp has2. The method of claim 1 , wherein crosslinking the bleached cellulose fibers includes crosslinking the bleached cellulose fibers while the pulp has a consistency greater than or equal to 15%.3. The method of claim 1 , wherein crosslinking the bleached cellulose fibers increases a WRV of the dried pulp.4. The method of claim 1 , wherein crosslinking the bleached cellulose fibers includes exposing the bleached cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups.5. The method of claim 1 , wherein crosslinking the bleached cellulose fibers includes exposing the bleached cellulose fibers to a crosslinker claim 1 , and ...

Modified cellulose from chemical kraft fiber and methods of making and using the same

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

Method and compositions for oxygen delignification of chemical pulp

The present disclosure provides methods and compositions for improving the oxygen delignification process. The methods may include adding low doses of a borohydride stabilized in an alkaline solution to brownstock pulp. The methods may result in significant chemical savings, increased pulp brightness, increased pulp yield, and reduced kappa number.

Methods of pulp fiber treatment

In some embodiments, a method may include treating pulp in pulp and paper mills. The methods may include providing a peracetate oxidant solution and generating a reactive oxygen species. The peracetate solution may include peracetate anions and a peracid. In some embodiments, the peracetate solution may include a pH from about pH 10 to about pH 12. In some embodiments, the peracetate solution has a molar ratio of peracetate anions to peracid ranging from about 60:1 to about 6000:1. In some embodiments, the peracetate solution has a molar ratio of peracetate to hydrogen peroxide of greater than about 16:1. The peracetate oxidant solution may provide enhanced treatment methods of bleaching, brightening, and delignifying pulp fibers involving the use of peracetate oxidant solutions.

BLEACHING AND SHIVE REDUCTION PROCESS FOR NON-WOOD FIBERS

The present invention is directed to a method of increasing the brightness of non-wood fibers and nonwoven fabric fabrics produced by the method. In one aspect, the method includes forming a mixture of non-wood fibers and exposing the mixture to a brightening agent to produce brightened fibers. The brightening agent is oxygen gas, peracetic acid, a peroxide compound, or a combination thereof. The brightened fibers have a brightness greater than the fibers of the mixture before exposure as measured by MacBeth UV-C standard. 1. Brightened bast fibers , comprising:a mean length of about 5 to about 95 millimeters (mm); anda brightness greater or equal to 80 as measured by a TAPPI brightness test.2. The brightened bast fibers of claim 1 , wherein the brightened bast fibers are substantially pectin-free and are flax fibers claim 1 , hemp fibers claim 1 , jute fibers claim 1 , ramie fibers claim 1 , nettle fibers claim 1 , Spanish broom fibers claim 1 , kenaf plant fibers claim 1 , or any combination thereof.3. A nonwoven fabric claim 1 , formed by a method comprising:forming bast fibers into fiber mat at consistency of about 20% to about 50%, the fibers having a mean length of about 5 to about 95 millimeters (mm); andexposing the fiber mat at the consistency of about 20% to about 50% to a brightening agent to produce brightened bast fibers, the brightening agent comprising a peroxide compound and oxygen gas, the oxygen gas being dissolved in solution and being about 0.1 to about 10.0% on fiber oxygen;wherein the brightened bast fibers have a brightness greater or equal to 80 as measured by a TAPPI standard.4. The nonwoven fabric of claim 3 , wherein the nonwoven fabric is a wet wiper claim 3 , a dry wiper claim 3 , an impregnated wiper claim 3 , a sorbent claim 3 , a medical supply product claim 3 , a personal protective fabric claim 3 , an automotive protective covering claim 3 , a personal care article claim 3 , a fluid filtration product claim 3 , a home furnishing ...

A LOW VISCOSITY KRAFT FIBER HAVING AN ENHANCED CARBOXYL CONTENT AND METHODS OF MAKING AND USING THE SAME

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. 1. A method of making an oxidized acid-treated kraft fiber comprising:subjecting cellulose fiber to a kraft pulping step;oxygen delignifying the cellulose fiber;bleaching the cellulose fiber using a multi-stage bleaching process;oxidizing the cellulose fiber with a peroxide and a catalyst under acidic conditions in at least one stage of the multi-stage bleaching process;treating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process prior to the at least one oxidation stage; andtreating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process following the at least one oxidation stage.2. The method of claim 1 , wherein the kappa number of the fiber after kraft pulping and oxygen delignification is from about 13 to about 21.3. The method of claim 1 , wherein the catalyst is chosen from at least one of copper and iron.4. The method of claim 1 , wherein the peroxide is hydrogen peroxide.5. The method of claim 4 , wherein the pH of the oxidation ranges from about 2 to about 6.6. The method of claim 5 , wherein the iron catalyst is chosen from at least one of ferrous sulfate claim 5 , ferrous chloride claim 5 , ferrous ammonium sulfate claim 5 , ferric chloride claim 5 , ferric ammonium sulfate claim 5 , or ferric ammonium citrate.7. The method of claim 6 , wherein the iron catalyst is added in an amount ranging from about 25 to about 150 ppm iron based on the dry weight of the kraft pulp.8. The method of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process.9. The method of any of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process comprising a sequence chosen from (C/A)(OX)(C/A)ED claim 1 , (C/A)(OX)DE(C/A) claim 1 , (C ...

Porphyrazines as efficient, catalytic and scalable method to produce chlorine dioxide

Methods, kits, cartridges, and compounds related to generating chlorine dioxide by exposing ClO 2 − to at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst are described.

OXIDATIVE METHOD

The present invention relates to a method of generating chlorine dioxide from chlorite salts in the presence of a manganese ion-containing complex, a method of treating a substrate with a chlorine-containing oxidant in the presence of a manganese ion-containing complex and related aqueous media, kits and compositions. 1. A method of generating chlorine dioxide from a chlorine-containing chemical , which is a chlorite salt , comprising contacting , in an aqueous medium , a chlorite salt and a complex comprising one or more manganese ions and one or more polydentate ligands , which are either chelants capable of chelating at least one manganese ion through four nitrogen atoms or are Schiff-base ligands , with the proviso that the complex does not comprise a porphyrin or porphyrazine ligand and wherein the aqueous medium comprises between about 0.001 and about 5 μM of the complex.2. A method of treating a substrate comprising contacting , in an aqueous medium , (i) the substrate (ii) an amount of a chlorine-containing chemical , which is chlorine dioxide and/or a chlorite salt; and (iii) a complex comprising one or more manganese ions and one or more polydentate ligands , which are either chelants capable of chelating at least one manganese ion through four nitrogen atoms or are Schiff-base ligands , with the proviso that the complex does not comprise a porphyrin or porphyrazine ligand and wherein the aqueous medium comprises between about 0.001 and about 5 μM of the complex.3. The method of claim 1 , wherein the substrate is a cellulosic substrate.4. The method of claim 2 , which is a method of treating water claim 2 , comprising contacting the water with an amount of the chlorine-containing chemical and the complex.5. The method of claim 1 , wherein the aqueous medium comprises between about 0.1 and about 5 μM of the complex.6. The method of claim 1 , wherein the method involves use of a chlorite salt selected from the group consisting of sodium chlorite claim 1 , ...

Measurement apparatus and method

A bleaching apparatus comprises a measurement chamber has a first substance, the amount of the first substance in the measurement chamber being known. A dosing unit inputs a second substance to the measurement chamber for causing a chemical reaction between the first substance and the second substance, one of the first substance and the second substance being chlorine dioxide and another of the first substance and the second substance being filtered sample from pulp slurry of a pulp process. At least one sensor performs detection of a property known to depend on the chemical reaction between the first substance and the second substance as a function of time. A data processing unit determines chemical demand of chlorine dioxide for washing loss in a bleaching sub-process on the basis of at least one value in the detected property within a known period of time after the input of the second substance.

A LOW VISCOSITY KRAFT FIBER HAVING AN ENHANCED CARBOXYL CONTENT AND METHODS OF MAKING AND USING THE SAME

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. 1. A method of making an oxidized acid-treated kraft fiber comprising:subjecting cellulose fiber to a kraft pulping step;oxygen delignifying the cellulose fiber;bleaching the cellulose fiber using a multi-stage bleaching process;oxidizing the cellulose fiber with a peroxide and a catalyst under acidic conditions in at least one stage of the multi-stage bleaching process;treating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process prior to the at least one oxidation stage; andtreating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process following the at least one oxidation stage.2. The method of claim 1 , wherein the kappa number of the fiber after kraft pulping and oxygen delignification is from about 13 to about 21.3. The method of claim 1 , wherein the catalyst is chosen from at least one of copper and iron.4. The method of claim 1 , wherein the peroxide is hydrogen peroxide.5. The method of claim 4 , wherein the pH of the oxidation ranges from about 2 to about 6.6. The method of claim 5 , wherein the iron catalyst is chosen from at least one of ferrous sulfate claim 5 , ferrous chloride claim 5 , ferrous ammonium sulfate claim 5 , ferric chloride claim 5 , ferric ammonium sulfate claim 5 , or ferric ammonium citrate.7. The method of claim 6 , wherein the iron catalyst is added in an amount ranging from about 25 to about 150 ppm iron based on the dry weight of the kraft pulp.8. The method of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process.9. The method of any of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process comprising a sequence chosen from (C/A)(OX)(C/A)ED claim 1 , (C/A)(OX)DE(C/A) claim 1 , (C ...

METHOD FOR PRODUCTION OF CELLULOSE NANOCRYSTALS FROM MISCANTHUS GIGANTEUS AND COMPOSITES THEREFROM

Methods for isolating cellulose nanocrystals (CNCs) from the plant (MxG). Impressive yields are obtained through a combination of processing steps including base hydrolysis, bleaching and acid hydrolysis. MxG-CNCs are produced having high aspect ratios, are biorenewable and can be used for a wide range of applications such as nanofillers in composites. MxG-CNC-containing composites are also disclosed. 1. A composite composition , comprising:{'i': 'Miscanthus Giganteus,', 'a matrix material; and cellulose nanocrystals from'}wherein the matrix material comprises one or more polymers or copolymers,wherein the polymers or copolymers comprise an alkylene oxide (co)polymer, a vinyl aromatic (co)polymer, a polyolefin (co)polymer, a diene (co)polymer, a polyacrylate (co)polymer, poly(vinyl acetate), poly(vinyl alcohol), a polyamide, a polyurethane, a polyester, or a combination thereof, and{'i': 'Miscanthus Giganteus', 'wherein the cellulose nanocrystals from are present in an amount of 1 to 20 parts based on 100 parts by weight of the matrix material.'}2Miscanthus Giganteus. The composite composition according to claim 1 , wherein the cellulose nanocrystals from have carboxyl functionality.3. A paper claim 2 , plastic claim 2 , rubber claim 2 , paint claim 2 , coating claim 2 , adhesive or sealant comprising the composition according to .4. A paper claim 2 , plastic claim 2 , rubber claim 2 , paint claim 2 , coating claim 2 , adhesive or sealant comprising the composition according to claim 2 , The present invention relates to methods for isolating cellulose nanocrystals (CNCs) from the plant (MxG). Impressive yields are obtained through a combination of processing steps including base hydrolysis, bleaching and acid hydrolysis. MxG-CNCs are produced having high aspect ratios, are biorenewable and can be used for a wide range of applications such as nanofillers in composites. MxG-CNC-containing composites are also disclosed.Cellulose nanocrystals have been isolated from ...

METHOD FOR MANUFACTURING BLEACHED PULP, FEEDSTOCK, AND PACKAGING SYSTEM

A feedstock includes feedstock paper and non-paper material. The feedstock paper includes lignin and cellulose. A method includes cooking the feedstock in cooking liquor to dissolve at least a portion of the lignin from the feedstock paper and to at least partially dissolve the non-paper material in the cooking liquor, thereby yielding a cooked pulp. The method further includes washing the cooked pulp to yield washed pulp and spent cooking liquor, regenerating the spent cooking liquor to yield regenerated cooking liquor, and bleaching the washed pulp. 1. A method for manufacturing bleached pulp from a feedstock comprising feedstock paper and non-paper material , the feedstock paper comprising lignin and cellulose , the method comprising:cooking the feedstock in a cooking liquor to dissolve at least a portion of the lignin from the feedstock paper and to at least partially dissolve the non-paper material in the cooking liquor, thereby yielding a cooked pulp;washing the cooked pulp to yield washed pulp and spent cooking liquor;regenerating the spent cooking liquor to yield regenerated cooking liquor; andbleaching the washed pulp.2. (canceled)3. The method of claim 1 , wherein the feedstock paper has claim 1 , on average claim 1 , a kappa number of at least 70.4. (canceled)5. The method of claim 1 , wherein the feedstock paper has claim 1 , on average claim 1 , a kappa number of at least 90.6. (canceled)7. The method of claim 1 , wherein the feedstock paper has claim 1 , on average claim 1 , a kappa number of at least 110.8. The method of claim 1 , wherein the feedstock paper has claim 1 , on average claim 1 , a kappa number of at least 120.9. The method of claim 1 , wherein the feedstock paper includes OCC materials.10. The method of claim 1 , wherein the non-paper material has a positive gross heating value in a dissolved state within the cooking liquor.11. (canceled)12. The method of claim 1 , wherein the non-paper material has a positive gross heating value in a ...

PROCESS FOR PRODUCING INCREASED BULK PULP FIBERS, PULP FIBERS OBTAINED, AND PRODUCTS INCORPORATING SAME

Processes for pulping raw pulp material, such as wood chips, to provide pulp fibers having increased bulk, as well as bleaching the resulting pulp fibers to provide bleached pulp fibers having increased bulk. These pulp fibers and bleached pulp fibers may be incorporated into or used various products, such as multi-ply coated paperboards, fluff pulp, etc. 1. A composition comprising one or more of: softwood pulp fibers having an ISO brightness of at least about 60 and a coarseness in the range of from about 15 to about 45 mg/100 m. of fiber; or hardwood pulp fibers having an ISO brightness of at least about 80 and a coarseness in the range of from about 5 to about 20 mg/100 m. of fiber , the pulp fibers comprising: from about 15 to about 27% by weight acid-insoluble lignin;', 'from about 20 to about 25% by weight hemicellulose;', 'from about 40 to about 50% by weight cellulose; and', 'about 0.4% or less by weight extractives; or, 'for softwood pulp fibers from about 8 to about 20% by weight acid-insoluble lignin;', 'from about 15 to about 25% by weight hemicellulose;', 'from about 47 to about 58% by weight cellulose; and, 'for hardwood pulp fibersfrom about 0.01 to about 0.08% by weight extractives.2. The composition of claim 1 , wherein the softwood pulp fibers are unbleached and comprise: from about 23 to about 27% by weight of acid-insoluble lignin; from about 20 to about 23% by weight of hemicellulose; from about 40 to about 50% by weight (of cellulose; and about 0.25% or less by weight extractives.3. The composition of claim 1 , wherein the softwood pulp fibers are bleached and comprise: from about 15 to about 20% by weight of acid-insoluble lignin; from about 22 to about 25% by weight of hemicellulose; from about 46 to about 50% by weight of cellulose; and about 0.01% or less by weight of the extractives.4. The composition of claim 1 , wherein the softwood pulp fibers have an ISO brightness of from about 60 to about 68.5. The composition of claim 4 , wherein ...

METHOD OF PRODUCING DISSOLVING PULP FROM LIGNOCELLULOSIC MATERIAL

The present invention relates to an improved process for producing dissolving pulp from a hydrolysis-kraft cooking process, and wherein production increases may result in less viscosity reduction and thus not meeting the target viscosities in the dissolving pulp produced. In order to compensate for losses in viscosity reduction in the cook at production increases is the oxygen delignification stage boosted with modest charges of peroxide that introduce an additional viscosity reduction. 1. A method for producing low viscosity dissolving pulp from lignocellulosic material , said dissolving process comprising a first acidic hydrolysis process followed by a kraft cooking process reaching a kappa number in the washed cooked pulp below 30 , said cooked and washed pulp subsequently further delignified in at least an oxygen delignification stage and finally bleached in at least one bleaching stage , and wherein the final target viscosity of the bleached dissolving pulp is primarily controlled by adjusting the conditions of the oxygen stage using temperature , alkali charge and oxygen charge obtaining a basic viscosity reduction in said oxygen stage in the range of 50-300 ml/g by said adjustment of temperature and charge of alkali and oxygen , said oxygen stage being further reinforced by a charge of at least one additional oxidation agent in order to obtain an additional viscosity reduction in said oxygen stage in the range of an additional 50-100 ml/g at least.2. Method according to wherein the additional oxidation agent is hydrogen peroxide.3. Method according to claim 2 , said dissolving process comprising following steps in sequence;a) subjecting comminuted cellulosic material for an acidic hydrolysis process wherein at least 20% of the original hemicellulose content of the lignocellulosic material is degraded in the hydrolysis process,b) subjecting the hydrolysed lignocellulosic material to a kraft cook obtaining a cooked pulp, c1) a retention time of at least 40 ...

MODIFIED CELLULOSE FROM CHEMICAL FIBER AND METHODS OF MAKING AND USING THE SAME

This disclosure relates to improved products containing oxidized cellulose. This disclosure further relates to improved methods of making oxidized cellulose in multi-stage bleaching processes, including, for example, in four-stage and three-stage bleaching processes. This disclosure further relates to products made therefrom, including wipe, tissue, towel, and napkin products. 131-. (canceled)32. A method of making an oxidized cellulose comprising:bleaching a cellulosic pulp using a four-stage bleaching process, wherein at least one stage of the four-stage bleaching process is an oxidizing stage comprising oxidizing the pulp with at least one peroxide and at least one catalyst under acidic conditions.33. The method according to claim 32 , wherein the at least one catalyst is chosen from at least one of a copper-containing catalyst and an iron-containing catalyst claim 32 , and wherein the at least one peroxide is hydrogen peroxide.34. The method according to claim 33 , wherein at least one stage of the bleaching process is a carboxylating stage comprising treating the fiber with a carboxylating agent.35. The method according to claim 33 , wherein the at least one oxidizing stage is followed by at least one bleaching stage.36. The method according to claim 33 , wherein no alkaline stage follows the at least one oxidizing stage.37. The method according to claim 33 , wherein the at least one oxidizing stage is followed by at least one carboxylating stage.38. The method according to claim 33 , wherein the at least one oxidizing stage is the second stage.39. The method according to claim 33 , wherein the at least one oxidizing stage is the third stage.40. The method according to claim 33 , wherein the at least one oxidizing stage is the fourth stage.41. The method according to claim 33 , wherein the four-stage bleaching process comprises a sequence chosen from at least one of DE(OX)D claim 33 , D(OX)ED claim 33 , D(OX)DE claim 33 , DED(OX) claim 33 , D(OX)D(OX) claim 33 ...

Low Viscosity Kraft Fiber Having an Enhanced Carboxyl Content and Methods of Making and Using the Same

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. 141.-. (canceled)42. A method of making a modified kraft fiber comprising:subjecting cellulose fiber to a kraft pulping step;oxygen delignifying the cellulose fiber following the kraft pulping step;bleaching the cellulose fiber following oxygen delignification using a five-stage bleaching process;oxidizing the cellulose fiber with a peroxide and a catalyst chosen from at least one of copper and iron under acidic conditions during the second stage of the five-stage bleaching process; andtreating the fiber with a carboxylating acid treatment comprising a combination of either sodium chlorite and hydrogen peroxide or chlorine dioxide and hydrogen peroxide during the third stage of the five-stage bleaching process.43. The method of claim 42 , wherein the kappa number of the fiber after the kraft pulping step is from about 13 to about 21.44. The method of claim 42 , wherein the kappa number of the fiber after the kraft pulping and oxygen delignification steps is from about 5 to about 8.45. The method of claim 42 , wherein the catalyst in the oxidation stage is an iron catalyst.46. The method of claim 45 , wherein the peroxide in the oxidation stage is hydrogen peroxide.47. The method of claim 46 , wherein the pH in the oxidation stage ranges from about 2 to about 6.48. The method of claim 47 , wherein the catalyst in the oxidation stage is chosen from at least one of ferrous sulfate claim 47 , ferrous chloride claim 47 , ferrous ammonium sulfate claim 47 , ferric chloride claim 47 , ferric ammonium sulfate claim 47 , or ferric ammonium citrate.49. The method of claim 48 , wherein the catalyst in the oxidation stage is added in an amount ranging from about 25 to about 250 ppm iron based on the dry weight of the cellulose fiber and wherein the hydrogen peroxide in ...

MODIFIED CELLULOSE FROM CHEMICAL KRAFT FIBER AND METHODS OF MAKING AND USING THE SAME

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them. 1247-. (canceled)248. A method of making a kraft fiber comprising:bleaching a cellulosic kraft pulp using a multi-stage bleaching process, andoxidizing the kraft pulp during two stages of the multi-stage bleaching process, wherein each oxidation stage comprises oxidation with peroxide and a catalyst under acidic conditions; andwherein the multi-stage bleaching process comprises at least one bleaching stage following the two oxidation stages.249. The method of claim 248 , wherein the catalyst is chosen from at least one of copper and iron.250. The method according to any of claims 249 , wherein the peroxide is hydrogen peroxide.251. The method according to claim 250 , wherein the catalyst is iron.252. The method according to claim 251 , wherein the pH of the oxidation stages range from about 2 to about 6.253. The method according to claim 252 , wherein the catalyst is chosen from at least one of ferrous sulfate claim 252 , ferrous chloride claim 252 , ferrous ammonium sulfate claim 252 , ferric chloride claim 252 , ferric ammonium sulfate claim 252 , or ferric ammonium citrate.254. The method according to claim 250 , wherein the catalyst is iron and is added in an amount ranging from about 25 to about 250 ppm Fe based on the dry weight of the kraft pulp.255. The method according to claim 250 , wherein the peroxide is added in an amount of from about 0.1 to ...

Fluff pulp

The present invention is directed to fluff pulp having a Kappa number in the range of from 5 to 18 and having, when in the form of a dry sheet, ISO brightness in the range of from 30 to 60% and having a specific volume in the dry defibrated state of at least 19 dm3/kg and having absorption time in the range of from 2 to 4 seconds.

Methods of microbial control

In some embodiments, a method may include reducing the microbial load in contaminated water of water recycle loops. These water recycling loops may include pulp and paper mills, cooling towers and water loops, evaporation ponds, feedstock processing systems and/or non-potable water systems. The methods may include providing a peracetate oxidant solution. The peracetate solution may include peracetate anions and a peracid. In some embodiments, the peracetate solution may include a pH from about pH 10 to about pH 12. In some embodiments, the peracetate solution has a molar ratio of peracetate anions to peracid ranging from about 60:1 to about 6000:1. In some embodiments, the peracetate solution has a molar ratio of peracetate to hydrogen peroxide of greater than about 16:1. The peracetate solution may provide bleaching, sanitizing and/or disinfection of contaminated water and surfaces. The peracetate oxidant solution may provide enhanced separation of microbes from contaminated water.

PRODUCT AND PROCESSES FROM AN INTEGRATED FOREST BIOREFINERY

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. 1. A method of producing a paper product , the method comprising:(a) providing a charge of lignocellulosic material;(b) contacting the charge of lignocellulosic material with water, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 130° C. and about 200° C. and lowering the pH to between about 3 and about 6.9 by producing acid from the reaction of the water and lignocellulosic material for a period in the range of between about 1 minute and about 6 hours, wherein an aqueous extract and extracted lignocellulosic materials are obtained and wherein the acid comprises acetic acid; and(c) pulping the extracted lignocellulosic materials to produce a pulp, wherein the pulp has a viscosity of greater than about 30 cP.2. The method of claim 1 , wherein the water and charge of lignocellulosic material are maintained at a temperature in the range of between about 145° C. and about 185° C.3. The method of claim 1 , wherein the water contacts the lignocellulosic material between about 15 minutes and about 240 minutes.4. The method of claim 1 , wherein the pulp has a viscosity of greater than about 40 cP.5. The method of claim 1 , wherein the pulping step produces individual fibers and fiber bundles having a kappa number of at most about 18 after about 15 minutes.6. The method of claim 1 , wherein the pulping step produces individual fibers and fiber bundles having a kappa number of at most about 11 after about 30 minutes.7. The method of claim 1 , wherein the pulping step produces individual fibers and fiber bundles having a kappa number of at most about 7 after about 60 minutes.8. The method of claim ...

REDUCING CONTENT OF HEXENURONIC ACIDS IN CELLULOSIC PULP

The improvement invention provides an enzymatic method for reducing the content of hexenuronic acids in a chemical cellulosic pulp and/or improvement of the brightness of cellulosic pulp using haloperoxidase. 1. A method for reducing the content of hexenuronic acids in a chemical cellulosic pulp and/or improving the brightness of a chemical cellulosic pulp , comprising contacting the cellulosic pulp with a haloperoxidase , hydrogen peroxide , and ions selected from the group consisting of chloride , bromide , iodide , and thiocyanate ions and optionally with one or more tertiary amines.2. The method of claim 1 , wherein the haloperoxidase is a chloroperoxidase from enzyme class EC 1.11.1.10.3. The method of claim 1 , wherein the haloperoxidase is a vanadium haloperoxidase.4Curvularia verruculosaCurvularia inequalis. The method of claim 1 , wherein the amino acid sequence of the haloperoxidase has at least 80% identity claim 1 , preferably at least 85% identity claim 1 , more preferably at least 90% identity claim 1 , even more preferably at least 95% identity claim 1 , and most preferably at least 97% identity to the amino acid sequence of a haloperoxidase (SEQ ID NO: 1) or a haloperoxidase (SEQ ID NO: 2).5. The method of claim 1 , wherein the chemical cellulosic pulp is also contacted with a xylanase; preferably an endo-1 claim 1 ,4-beta-xylanase from enzyme class EC 3.2.1.8.6Bacillus agaradhaerens. The method of claim 5 , wherein the amino acid sequence of the xylanase has at least 60% identity claim 5 , preferably at least 65% identity claim 5 , more preferably at least 70% identity claim 5 , more preferably at least 75% identity claim 5 , more preferably at least 80% identity claim 5 , more preferably at least 85% identity claim 5 , more preferably at least 90% identity claim 5 , even more preferably at least 95% identity claim 5 , and most preferably at least 97% identity to the amino acid sequence of a xylanase (SEQ ID NO: 3).7. The method of claim 5 , wherein ...

Modified cellulose from chemical kraft fiber and methods of making and using the same

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

Methods for oxygen delignification and ozone bleaching of pulp

A method for treating pulp through oxygen delignification and ozone bleaching is disclosed. The method uses a modified oxygen recovery unit which separates a mixture of oxygen and ozone thereby generating a stream of ozone and a stream of oxygen; feeding the stream of oxygen to an oxygen delignification unit; feeding a pulp to the oxygen delignification unit; feeding the stream of ozone to an ozone bleaching unit; feeding the delignified pulp to the ozone bleaching unit; and recovering the delignified and bleached pulp.

TREATED KRAFT PULP COMPOSITIONS AND METHODS OF MAKING THE SAME

Compositions including treated Kraft pulp, useful for making rayon fibers, having a lower degree of polymerization, a high R18, a low hemicellulose content, and high reactivity, are described. Methods of making the compositions are also described. 1. A treated Kraft pulp , comprising:a hemicellulose content of 5% or more;a R18 value of 88% or more; and a standard reactivity of 3.5 mL or more,', 'a modified reactivity of 30 mL or more,', 'a filter value Kr of 10,000 or less,', 'a SEM fiber segment count of 11 or less per 100 μm2 of a filter when the pulp is subjected to a modified reactivity test, and', 'a crystallite cross-section of less than 20.6 nm2;, 'at least one reactivity value selected fromwherein the treated pulp has less than 8% by weight of cellulose II as determined by x-ray crystallography.2. The treated pulp of claim 1 , wherein the hemicellulose content is greater than 7%.3. The treated pulp of claim 1 , wherein the R18 value is from 88% to 92%.4. The treated pulp of claim 1 , wherein the treated pulp further comprises one or more of a pentosan content of from 4.6% to 9% claim 1 , a xylan content of 4 to 8% claim 1 , and a mannan content of 3% to 8%.5. The treated pulp of claim 1 , wherein the treated pulp comprises a standard reactivity of 5 mL or more.6. The treated pulp of claim 1 , wherein the treated pulp comprises a modified reactivity of 50 mL or more.7. The treated pulp of claim 1 , wherein the treated pulp comprises a filter value Kr of 8 claim 1 ,000 or less.8. The treated pulp of claim 1 , wherein the treated pulp further comprises a carboxyl content of less than 3.6 meq/100 g.9. The treated pulp of claim 1 , wherein the treated pulp further has an ASTM degree of polymerization of from 600 to 900.10. The treated pulp of claim 1 , wherein the treated pulp further has a copper number of from 0.3 to 1.2.11. The treated pulp of claim 1 , wherein the treated pulp has 0% cellulose II as determined by x-ray crystallography.12. The treated pulp of ...

CROSSLINKED CELLULOSE AS PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY

A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. 1. A method , comprising:forming a pulp from a cellulosic feedstock;bleaching the pulp;crosslinking cellulose fibers within the pulp while the pulp has a consistency greater than or equal to 12%; anddrying the pulp after bleaching the pulp and after crosslinking the cellulose fibers, wherein the dried pulp has a resultant carboxymethyl cellulose viscosity greater than or equal to 60 centipoise.2. The method of wherein crosslinking the cellulose fibers includes crosslinking the cellulose fibers while the pulp has a consistency greater than or equal to 15%.3. The method of wherein bleaching the pulp includes bleaching the pulp according to a Kraft bleaching process.4. The method of wherein bleaching the pulp includes oxygen bleaching the pulp.5. The method of wherein bleaching the pulp includes chlorine dioxide bleaching the pulp after oxygen bleaching the pulp.6. The method of wherein bleaching the pulp includes increasing a brightness of the pulp to a brightness greater than or equal to 75%.7. The method of wherein bleaching the pulp includes reducing a lignin content of ...

Use of surfactant to treat pulp and improve the incorporation of kraft pulp into fiber for the production of viscose and other secondary fiber products

A surfactant treated bleached softwood kraft pulp fiber, useful as a starting material in the production of cellulose derivatives including cellulose ether, cellulose esters and viscose, is disclosed. Methods for making the kraft pulp fiber and products made from it are also described.

LOW VISCOSITY KRAFT FIBER HAVING AN ENHANCED CARBOXYL CONTENT AND METHODS OF MAKING AND USING THE SAME

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. 1. A chemically modified kraft fiber comprising cellulose which has been catalytically oxidized and treated with a carboxylating acid , having a carboxyl content greater than about 6 meq/100 g , an aldehyde content of less than 1 meq/100 g and viscosity less than 5.5 mPa·s.2. The fiber of claim 1 , wherein the carboxyl content is at least about 7 meq/100 g.3. The fiber of claim 1 , wherein the ISO brightness is from about 85 to about 92.4. The fiber of claim 1 , having a degree of polymerization of from about 350 to about 1860.5. The fiber of claim 1 , having an aldehyde content of less than about 0.6 meq/100 g.6. The fiber of claim 1 , having a carbonyl content ranging from about 1.5 meq/100 g to about 2.5 meq/100 g.7. The fiber of having a viscosity of from about 3 mPa·s to about 5.5.8. The fiber of having a viscosity of from about 3 claim 1 , mPa·s to about 4.9. The fiber of claim 1 , having a copper number of greater than about 2 claim 1 , or greater than about 2.5 claim 1 , or greater than about 3.10. The fiber of claim 1 , having an S10 caustic solubility ranging from about 14% to about 30.11. The fiber of claim 1 , having an S18 caustic solubility less than about 16%.12. The fiber of claim 1 , having an R10 value from at least about 72%.13. The fiber of claim 1 , having an R18 value ranging from at least about 79.14. The fiber of claim 1 , wherein the fiber is softwood fiber and having a hemicellulose content of from about 12% to about 17%.15. The fiber of claim 1 , wherein the fiber is softwood fiber and having a fiber length of at least about 2 mm.16. The fiber of claim 1 , wherein the fiber exhibits antimicrobial and/or antibacterial properties.17. The fiber of claim 1 , wherein the fiber is contained within an absorbent product that further ...

REDUCING CONTENT OF HEXENURONIC ACIDS IN CELLULOSIC PULP

The present invention provides an enzymatic method for reducing the content of hexenuronic acids in a chemical cellulosic pulp and/or improvement of the brightness of cellulosic pulp using haloperoxidase. 115-. (canceled)16. A method for reducing the content of hexenuronic acids and/or improving the brightness of a cellulosic pulp , comprising contacting the cellulosic pulp with a haloperoxidase , hydrogen peroxide , and one or more ions selected from chloride , bromide , iodide , and thiocyanate.17. The method of claim 16 , further comprising contacting the cellulosic pulp with one or more tertiary amines.18. The method of claim 16 , wherein the haloperoxidase is a chloroperoxidase from enzyme class EC 1.11.1.10.19. The method of claim 16 , wherein the haloperoxidase is a vanadium haloperoxidase.20. The method of claim 16 , wherein the amino acid sequence of the haloperoxidase has at least 80% identity to SEQ ID NO: 1 or SEQ ID NO: 2.21. The method of claim 16 , further comprising contacting the cellulosic pulp with a xylanase.22. The method of claim 21 , wherein the xylanase is an endo-1 claim 21 ,4-beta-xylanase from enzyme class EC 3.2.1.8.23. The method of claim 21 , wherein the amino acid sequence of the xylanase has at least 60% identity to SEQ ID NO: 3.24. The method of claim 21 , wherein the amino acid sequence of the haloperoxidase has at least 95% identity to SEQ ID NO: 1 and the amino acid sequence of the xylanase has at least 95% identity to SEQ ID NO: 3.25. The method of claim 16 , wherein the cellulosic pulp is a pulp made by alkaline cooking.26. The method of claim 25 , wherein the cellulosic pulp is a kraft pulp or a sulfite pulp.27. The method of claim 16 , further comprising an alkaline extraction stage.28. The method of claim 27 , wherein the alkaline extraction stage is reinforced with hydrogen peroxide and/or oxygen with or without a previous bleaching agent.29. A method for reducing the content of hexenuronic acids of a cellulosic pulp claim ...

METHODS OF PRODUCING A PAPER PRODUCT

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. 111.-. (canceled)12. A pulp produced in accordance with the process of:(a) contacting a charge of a lignocellulosic material with water, the lignocellulosic material containing an initial amount of xylan, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 20° C. and about 200° C. and lowering the pH to between about 3 and about 6.9 by producing acetic acid from the reaction of the water and lignocellulosic material for a period of about 10 minutes to about 4 days, to form extracted lignocellulosic materials; and(b) pulping said extracted lignocellulosic materials.13. The pulp of claim 12 , wherein the pulp is bleached and has a brightness greater than about 90%.14. The pulp of claim 12 , wherein the pulp has a specific surface area between about 5 claim 12 ,000 cm/g and about 40 claim 12 ,000 cm/g.15. The pulp of claim 12 , wherein the pulp has a specific surface area between about 15 claim 12 ,000 cm/g and about 25 claim 12 ,000 cm/g.16. The pulp of claim 12 , wherein the pulp has a specific volume between about 1.5 cm/g and about 4.0 cm/g.17. The pulp of claim 12 , wherein the pulp has a specific volume between about 2.75 cm/g and about 3.75 cm/g.18. The pulp of claim 12 , wherein the pulp is effectuated by a process selected from the group consisting of mechanical pulping claim 12 , chemical pulping and a combination of mechanical and chemical pulping.19. The pulp of wherein the pulp is effectuated by mechanical pulping.20. The pulp of claim 19 , wherein the mechanical pulping is fiber separation by mechanical force. This is a continuation of U.S. patent application Ser. No. 15/625,545, ...

CROSSLINKED CELLULOSE AS LOW-COST PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY

A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. 1. A method , comprising:forming a pulp from a cellulosic feedstock;bleaching the pulp;crosslinking cellulose fibers within the pulp while the pulp has a consistency greater than or equal to 12%; anddrying the pulp after bleaching the pulp and after crosslinking the cellulose fibers, wherein the dried pulp has a resultant carboxymethyl cellulose viscosity greater than or equal to 60 centipoise.2. The method of wherein crosslinking the cellulose fibers includes crosslinking the cellulose fibers while the pulp has a consistency greater than or equal to 15%.3. The method of wherein bleaching the pulp includes bleaching the pulp according to a Kraft bleaching process.4. The method of wherein bleaching the pulp includes oxygen bleaching the pulp.5. The method of wherein bleaching the pulp includes chlorine dioxide bleaching the pulp after oxygen bleaching the pulp.6. The method of wherein bleaching the pulp includes increasing a brightness of the pulp to a brightness greater than or equal to 75%.7. The method of wherein bleaching the pulp includes reducing a lignin content of ...

TREATED KRAFT PULP COMPOSITIONS AND METHODS OF MAKING THE SAME

Compositions including treated Kraft pulp, useful for making rayon fibers, having a lower degree of polymerization, a high R18, a low hemicellulose content, and high reactivity, are described. Methods of making the compositions are also described. 1. A treated Kraft pulp , comprising:a hemicellulose content of 5% or more;a R18 value of 88% or more; and a standard reactivity of 3.5 mL or more,', 'a modified reactivity of 30 mL or more,', 'a gamma number of 60% or less,', 'a filter value Kr of 10,000 or less,', {'sup': '2', 'a SEM fiber segment count of 11 or less per 100 μmof a filter when the pulp is subjected to a modified reactivity test, and'}], 'at least one reactivity value selected from{'sup': '2', 'a crystallite cross-section of less than 20.6 nm;'}wherein the treated pulp has less than 8% by weight of cellulose II as determined by x-ray crystallography; andwherein the treated Kraft pulp is treated chemical wood pulp.2. The treated pulp of claim 1 , wherein the hemicellulose content is greater than 7%.3. The treated pulp of claim 1 , wherein the R18 value is from 88% to 92%.4. The treated pulp of claim 1 , wherein the treated pulp further comprises one or more of a pentosan content of from 4.6% to 9% claim 1 , a xylan content of 4% to 8% claim 1 , and a mannan content of 3% to 8%.5. The treated pulp of claim 1 , wherein the treated pulp comprises a standard reactivity of 5 mL or more.6. The treated pulp of claim 1 , wherein the treated pulp comprises a modified reactivity of 50 mL or more.7. The treated pulp of claim 1 , wherein the treated pulp comprises a filter value Kr of 8 claim 1 ,000 or less.8. The treated pulp of claim 1 , wherein the treated pulp further comprises a carboxyl content of less than 3.6 meq/100 g.9. The treated pulp of claim 1 , wherein the treated pulp further has an ASTM degree of polymerization of from 600 to 900.10. The treated pulp of claim 1 , wherein the treated pulp further has a copper number of from 0.3 to 1.2.11. The treated ...

Method for extracting cellusose, hemicellulose and lignin from lignocellulose from plant biomass

A process for obtaining cellulose, hemicellulose and lignin from lignocellulose can be carried out in an environmentally friendly manner when it comprises the following steps: step a) wherein a lignocellulose from plant biomass is provided, step b) wherein the lignocellulose is brought into contact with a first mixture M1 containing water and an alkaline component, and a first suspension S1 forms, the first suspension S1 comprises a first solid F1 and a first liquid phase P1, wherein the first solid F1 contains a crude cellulose, and the first liquid phase P1 contains hemicellulose and lignin, and step c) wherein the crude-cellulose-containing solid F1 is brought into contact with a second mixture M2 containing formic acid and water and optionally acetic acid, and a second suspension S2 forms, the second suspension S2 comprises a second solid F2 and a second liquid phase P2, wherein the second solid F2 contains a pure cellulose, and the second liquid phase P2 contains hemicellulose and lignin.

IRON PORPHYRAZINES AS EFFICIENT, CATALYTIC AND SCALABLE METHOD TO PRODUCE CHLORINE DIOXIDE

Methods, kits, cartridges, and compounds related to generating chlorine dioxide by exposing ClOto at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst are described. 1. A cartridge comprising a housing and at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst in the housing , wherein the cartridge is adapted to allow reactants to contact the at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst.3. The cartridge of claim 2 , wherein the alkyl is selected from straight-chain or branched-chain alkyl radicals containing from 1 to 22 carbon atoms claim 2 , methyl claim 2 , ethyl claim 2 , n-propyl claim 2 , isopropyl claim 2 , n-butyl claim 2 , isobutyl claim 2 , sec-butyl claim 2 , tert-butyl claim 2 , pentyl claim 2 , iso-amyl claim 2 , hexyl claim 2 , octyl claim 2 , nonyl claim 2 , decyl claim 2 , dodecyl claim 2 , tetradecyl claim 2 , hexadecyl claim 2 , octadecyl claim 2 , and eicosyl.4. The cartridge of claim 2 , wherein R claim 2 , R claim 2 , R claim 2 , and Rare TDMBImp.5. The cartridge of claim 2 , wherein R claim 2 , R claim 2 , R claim 2 , and Rare TM2PyP or R claim 2 , R claim 2 , Rand Rare TM4PyP.7. The cartridge of claim 6 , wherein the alkyl is selected from straight-chain or branched-chain alkyl radicals containing from 1 to 22 carbon atoms claim 6 , methyl claim 6 , ethyl claim 6 , n-propyl claim 6 , isopropyl claim 6 , n-butyl claim 6 , isobutyl claim 6 , sec-butyl claim 6 , tert-butyl claim 6 , pentyl claim 6 , iso-amyl claim 6 , hexyl claim 6 , octyl claim 6 , nonyl claim 6 , decyl claim 6 , dodecyl claim 6 , tetradecyl claim 6 , hexadecyl claim 6 , octadecyl claim 6 , and eicosyl.8. The cartridge of claim 1 , wherein the cartridge comprises the reactants claim 1 , and the reactants comprise ClO.9. The cartridge of claim 8 , wherein the ClO is provided from at least one substance selected from the group consisting of chlorite salts.10. The cartridge of claim 8 , wherein the ClO is ...

Use of Cellulase to improve Viscosity Control of Dissolving Pulp

The present invention relates to treatment of unbleached or partially bleached or alkaline extracted dissolving pulp with one or more cellulases. The cellulase treatment results in increased viscosity control, reduced viscosity and/or increased reactivity of the final dissolving pulp.

Low Capital Bleaching of Chemical Pulp

Bleaching methods and formulations for bleaching/delignification processes for chemical pulp are provided. The bleaching methods utilize peroxide and an organomanganese complex under aqueous caustic conditions, increasing bleaching efficiency of the overall bleaching/delignification process. Chemical pulp having increased brightness can be obtained at decreased temperatures and with reduced stage time, resulting in reduced chemical consumption and improved energy efficiency.

Method for Production of Cellulose Nanocrystals from Miscanthus Giganteus and Composites Therefrom

Methods for isolating cellulose nanocrystals (CNCs) from the plant Miscanthus Giganteus (MxG). Impressive yields are obtained through a combination of processing steps including base hydrolysis, bleaching and acid hydrolysis. MxG-CNCs are produced having high aspect ratios, are biorenewable and can be used for a wide range of applications such as nanofillers in composites. MxG-CNC-containing composites are also disclosed.

NOVEL DISSOLVING WOOD PULPS AND METHODS OF MAKING AND USING THE SAME

This disclosure relates to methods of making novel dissolving wood pulps by processes comprising acid prehydrolysis, pulping, and a multi-stage bleaching process comprising oxidation with a catalyst and peroxide under acidic conditions, as well as to products made therefrom having a combination of medium-purity, low viscosity, and improved reactivity, filterability, and/or clogging that can be used as a substitute for traditional high-purity dissolving pulps in a wide variety of applications. 1. A method of making a kraft dissolving wood pulp comprising:subjecting a cellulosic material to an acid prehydrolysis process,subsequently subjecting the cellulosic material to a kraft cooking process to form a kraft pulp,subjecting the kraft pulp to a multi-stage bleaching process to form a kraft dissolving wood pulp, wherein at least one stage of the multi-stage bleaching process is an oxidation bleaching stage (OX) comprising oxidizing the pulp with at least one peroxide and at least one catalyst under acidic conditions.2. The method of claim 1 , wherein the cellulosic material is a softwood.3. The method of claim 2 , wherein kraft pulp is subjected to an oxygen delignification process after the kraft cooking process and before the multi-stage bleaching process.4. The method of claim 3 , wherein the oxidation bleaching stage (OX) is carried out at an acidic pH with an iron catalyst and hydrogen peroxide.5. The method of claim 4 , wherein the oxidation bleaching stage (OX) is carried out at an acidic pH from about 2 to about 5 with an iron catalyst in an amount from about 5 ppm Feto about 100 ppm Feand hydrogen peroxide in an amount ranging from about 0.01% to about 0.3% based on the dry weight of the kraft pulp.6. The method of claim 4 , wherein the dissolving wood pulp is further treated with a surfactant following the multi-stage bleaching process.7. The method of claim 6 , wherein the multi-stage bleaching sequence is chosen from one of D(OX)D claim 6 , DE(OX) claim 6 , ...

NOVEL DISSOLVING WOOD PULPS AND METHODS OF MAKING AND USING THE SAME

This disclosure relates to methods of making novel dissolving wood pulps by processes comprising acid prehydrolysis, pulping, and a multi-stage bleaching process comprising oxidation with a catalyst and peroxide under acidic conditions, as well as to products made therefrom having a combination of medium-purity, low viscosity, and improved reactivity, filterability, and/or clogging that can be used as a substitute for traditional high-purity dissolving pulps in a wide variety of applications. 1. A kraft dissolving wood pulp made from softwood comprising an R10 of from about 87% to about 92% , a viscosity of from about 4 mPa·s to about 7.5 mPa·s , and a clogging value (Kr) of less than about 1000.2. The kraft dissolving wood pulp of claim 1 , further comprising an R18 from about 93% to about 95%.3. The kraft dissolving wood pulp of claim 1 , further comprising a pentosans level of from about 2% to about 5%.4. The kraft dissolving wood pulp of claim 1 , further comprising an ISO brightness of from about 86 to about 90.5. The kraft dissolving wood pulp of claim 1 , further comprising a carboxyl content of from about 2 meq/100 g to about 4 meq/100 g and a copper number from about 0.5 to about 1.5.6. The kraft dissolving wood pulp of claim 1 , further comprising a filterability of at least about 2000 grams/min and a carbon disulfide reactivity of ΔT less than 10 seconds at 9 ml carbon disulfide for 14.4 g of oven dried pulp.7. The kraft dissolving wood pulp of claim 1 , comprising an R10 of from about 87% to about 90% claim 1 , a viscosity of from 5.5 mPa·s to 6.5 mPa·s claim 1 , a clogging value (Kr) of less than about 600 claim 1 , and an ISO brightness of at least about 88.8. The kraft dissolving wood pulp of claim 1 , comprising an R10 of from about 90% to about 92% claim 1 , a viscosity of from 6.5 mPa·s to 7.5 mPa·s claim 1 , a clogging value (Kr) of less than about 800 claim 1 , and an ISO brightness of at least about 88.9. A viscose product made from the kraft ...

METHOD FOR LIGNIN DEPOLYMERISATION

The present invention is in the field of delignifying and/or bleaching of pulp, more in particular wood pulp. Such a process is useful in paper production. More in particular, the method relates to the use of an enzyme for delignification and/or bleaching, more in particular a bacterial laccase. Even more in particular, it provides a method for delignifying and/or bleaching of a pulp, comprising an enzymatic treatment step wherein lignin-containing pulp and a laccase are reacted at alkaline pH, wherein the laccase has an amino acid sequence according to SEQ ID NO: 1 or an amino acid sequence at least 90% identical to SEQ ID NO: 1. 1. Method A method for lignin depolymerization , the method comprising:contacting a solution or suspension containing lignin with a laccase at alkaline pH,the laccase comprises an amino acid sequence at least 90% identical to SEQ ID NO: 1; andthe lignin is depolymerized.2. The method according to claim 1 , wherein the solution or suspension containing lignin comprises a pulp.3. The method according to claim 2 , wherein the pulp is a mechanical pulp or a chemical pulp.4. The method according to claim 2 , further comprising bleaching the pulp.5. The method according to claim 4 , wherein bleaching the pulp comprises:the pulp with a bleaching chemical selected from the group consisting of peroxide, hydrogen peroxide, oxygen, ozone, chlorine dioxide and a mixture of chlorine dioxide and chlorine gas.6. The method according to claim 1 , wherein the solution or suspension containing lignin comprises at least 40% lignin as a fraction of the dry matter of the solution or suspension.7. The method according to claim 1 , wherein contacting the solution or suspension is carried out at a temperature between 10 and 90 degrees Celsius.8. The method according to claim 7 , wherein the temperature is above 40 degrees.9. The method according to claim 7 , wherein the temperature is below 50 degrees.10. The method according to claim 1 , wherein the pH of the ...

Method of processing and fractionating biomass and use of fractions thus obtained

The present invention relates to a method of treating biomass, comprising providing a lignocellulosic biomass feedstock; contacting the biomass feedstock in a mixture, which is formed by the biomass, water and an alkaline agent, with an oxidizing agent at an elevated temperature; and continuing the contacting of the biomass feedstock with the oxidizing agent until a notable part of the lignin is solubilised. The step of providing the biomass feedstock comprises contacting a biomass raw-material containing cellulose, hemicellulose and lignin in an aqueous phase with an alkaline agent; continuing the contacting of the biomass with the alkaline agent until a significant portion of the hemicellulose is dissolved in the aqueous phase to provide a modified biomass; recovering the modified biomass; optionally opening the structure of the modified biomass by mechanical treatment; and using the modified biomass as a lignocellulosic biomass feedstock. Treating the biomass provides hemicellulose, lignin and cellulose fractions that have a multitude of applications in the bioeconomy. 1. A method of fractionation of biomass , in particular in the absence of sulphurous chemicals , comprising the steps of:a) providing a lignocellulosic biomass feedstock containing cellulose, hemicelluloses and lignin;b) dispersing the biomass feedstock in an aqueous phase;c) separating at least a part of the hemicelluloses from the biomass by dissolving them into the aqueous phase;d) defibering the biomass to provide a modified biomass;e) contacting the modified biomass in an aqueous phase with an oxidizing agent in the presence of an alkaline agent at an elevated temperature;f) continuing the contacting of the biomass with the oxidizing agent until a part of the lignin is solubilised and a cellulose-enriched biomass is obtained; andg) recovering the cellulose-enriched biomass thus obtained.2. The method according to claim 1 , further comprising recovering the hemicelluloses obtained in step c.3. ...

METHOD OF CONTROLLING THE CHEMICAL BALANCE OF A PULP MILL

A method to optimize the chemical balance at a sulfate pulp mill, which produces at least pulp bleached with chlorine dioxide and has a chlorine dioxide plant using at least chlorate, methanol and sulfuric acid for making chlorine dioxide. The method includes: a) gases from the mill's concentrated non-condensable gas system are incinerated in order to form a gas containing sulfur dioxide, which is treated to produce concentrated sulfuric acid, and b) raw methanol from the mill processes is purified to produce methanol, and c) side streams containing sodium compounds and/or sulfur compounds produced by mill processes are used as make-up chemicals, wherein the production of chlorine dioxide uses the sulfuric acid produced in step a) and methanol purified in step b), with a sulfuric acid concentration of 94-99%, preferably 95-98%, and using in step c) sesquisulfate or sodium sulfate produced during the production of chlorine dioxide. 1. A method for controlling a chemical balance at a sulfate pulp mill , wherein the sulfate pulp mill produces at least pulp bleached with chlorine dioxide and the sulfate pulp mill includes a chlorine dioxide plant using at least chlorate , methanol and sulfuric acid to produce chlorine dioxide , the method comprising:incinerating a concentrated non-condensable gas produced in the sulfate pulp mill to form a gas containing sulfur dioxide,treating the gas containing sulfur dioxide to produce a concentrated sulfuric acid having a sulfuric acid concentration of 94% to 99%;purifying raw methanol from the sulfate pulp mill to produce a purified methanol, andusing side streams containing sodium compounds and/or sulfur compounds produced by the sulfate pulp mill as make-up chemicals in the sulfate pulp mill,wherein production of chlorine dioxide in the sulfate pulp mill uses the concentrated sulfuric acid and the purified methanol; andwherein sesquisulfate or sodium sulfate produced during the production of chlorine dioxide is used.2. The method ...

METHODS OF PRODUCING A PAPER PRODUCT

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. 111. -. (canceled)12. A process of pulping lignocellulosic materials comprising:(a) contacting a charge of a lignocellulosic material with water, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 20° C. and about 200° C. and lowering the pH to between about 0.5 and about 6.9 by producing acetic acid from the reaction of the water and lignocellulosic material for a period in the range of between about 1 minute and about 7 days, wherein an aqueous extract and extracted lignocellulosic materials are obtained; and(b) pulping said extracted lignocellulosic materials with a mixture of a hydroxide and an anthraquinone (AQ) wherein individual fibers and fiber bundles are produced.13. The process of claim 12 , wherein the hydroxide is selected from the group consisting of sodium hydroxide claim 12 , potassium hydroxide and mixtures thereof.14. The process of claim 12 , wherein the AQ is a sodium anthraquinone-2-sulfonate (SAQ).15. The process of claim 12 , wherein the AQ is a 2-methylanthraquinone (MAQ).16. The process of claim 12 , wherein the concentration of the AQ in the mixture is 0.05-0.1%. This is a continuation of U.S. patent application Ser. No. 15/051,742, filed Feb. 24, 2016, which is a continuation of U.S. patent application Ser. No. 14/603,663, filed January 23, 2015, now U.S. Pat. No. 9,273,431, which is a continuation of U.S. patent application Ser. No. 14/198,754, filed Mar. 6, 2014, now U.S. Pat. No. 8,940,133, which is a continuation of U.S. patent application Ser. No. 13/683,642, filed Nov. 21, 2012, now U.S. Pat. No. 8,668,806, which is a divisional of U.S. patent application ...

Method for Production of Cellulose Nanocrystals from Miscanthus Giganteus and Composites Therefrom

Methods for isolating cellulose nanocrystals (CNCs) from the plant (MxG). Impressive yields are obtained through a combination of processing steps including base hydrolysis, bleaching and acid hydrolysis. MxG-CNCs are produced having high aspect ratios, are biorenewable and can be used for a wide range of applications such as nanofillers in composites. MxG-CNC-containing composites are also disclosed. 1Miscanthus Giganteus. A process for isolating cellulose nanocrystals from , comprising the steps of:{'i': 'Miscanthus Giganteus;', 'performing a base hydrolysis step on a quantity of'}performing a bleaching step on a solid material recovered from the base hydrolysis step;performing an acid hydrolysis step on a solid material recovered from the bleaching step; and{'i': 'Miscanthus Giganteus', 'recovering cellulose nanocrystals from after performing the acid hydrolysis step.'}2Miscanthus Giganteus. The process according to claim 1 , wherein prior to performing the base hydrolysis step a quantity of is obtained and comminuted to reduce an average particle size of solid material to a smaller average particle size.3Miscanthus Giganteus. The process according to claim 1 , wherein the base hydrolysis step includes contacting the with a basic solution having a pH of about 13 to about 14 claim 1 , and wherein the base utilized has a formula of MOH claim 1 , wherein M is a cationic counter ion.4. The process according to claim 3 , wherein the bleaching step comprises contacting one or more of sodium chlorite and sodium hypochlorite; and also acetic acid with the solid material recovered from the base hydrolysis step claim 3 , wherein the one or more of the sodium chlorite and sodium hypochlorite are present in a concentration between about 0.5 in about 4 weight percent and a concentration of acetic acid is between about 0.2 and about 9 weight percent.5. The process according to claim 4 , wherein the bleaching step is performed for about 1 to about 3 hours at a temperature of ...

PROCESS FOR THE PRODUCTION OF A TREATED PULP, TREATED PULP, AND TEXTILE FIBRES PRODUCED FROM THE TREATED PULP

The present invention relates to a process for the production of treated pulp comprising the steps of: i. providing a fibre source material; ii. subjecting the fibre source material to pre-hydrolysis; iii. subjecting the pre-hydrolysed fibre source material to alkaline chemical pulping process, preferably kraft pulping, to obtain an alkaline pulp; iv. optionally adjusting the pH of the obtained pulp to above pH 9; v. subjecting the alkaline pulp to a bleaching sequence comprising contacting the pulp with ozone (Z) in alkaline conditions to obtain a treated pulp. The invention also relates to a treated pulp obtained, textile fibres produced from the treated pulp, textile products comprising the textile fibres and to the use of the treated pulp. 1. A process for the production of treated pulp comprising the steps of:i. providing a fibre source material;ii. subjecting the fibre source material to pre-hydrolysis;iii. subjecting the pre-hydrolysed fibre source material to an alkaline chemical pulping process to obtain an alkaline pulp;iv. optionally adjusting the pH of the alkaline pulp to above pH 9; andv. subjecting the alkaline pulp to a bleaching sequence comprising contacting the alkaline pulp with ozone (Z) in alkaline conditions to obtain a treated pulp.2. The process according to claim 1 , wherein the process further comprises a step of withdrawing pre-hydrolysate liquor after step (ii).3. The process according to claim 1 , wherein the bleaching sequence comprises the step of contacting the alkaline pulp with oxygen (O) prior to contacting the alkaline pulp with ozone (Z) in alkaline conditions.4. The process according to claim 3 , wherein the step of contacting the alkaline pulp with oxygen (O) is performed as a double step (OO) in two separate steps.5. The process according to claim 4 , wherein the first oxygen step in the double step is shorter than the second oxygen step.6. The process according to claim 1 , wherein the bleaching sequence comprises a step of ...

IRON PORPHYRAZINES AS EFFICIENT, CATALYTIC AND SCALABLE METHOD TO PRODUCE CHLORINE DIOXIDE

Methods, kits, cartridges, and compounds related to generating chlorine dioxide by exposing ClO to at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst are described. 1. A method of generating chlorine dioxide comprising exposing ClO to at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst.3. The method of claim 2 , wherein R claim 2 , R claim 2 , Rand Rare TDMBImp.4. The method of claim 2 , wherein R claim 2 , R claim 2 , Rand Rare TM2PyP or R claim 2 , R claim 2 , Rand Rare TM4PyP.6. The method of claim 1 , wherein the ClO is provided from at least one substance selected from the group consisting of chlorite salts.7. The method of claim 1 , wherein the ClO is provided from at least one substance selected from the group consisting of sodium chlorite claim 1 , potassium chlorite claim 1 , calcium chlorite and magnesium chlorite.8. The method of claim 1 , wherein the ClO is mixed with a solid filler.9. The method of claim 1 , wherein the ClO is adsorbed on at least one substance selected from the group consisting of clay claim 1 , silica claim 1 , alumina and organic polymers.10. The method of claim 1 , wherein at least one of the iron porphyrin catalyst or the iron porphyrazine catalyst is adsorbed on a solid support.11. The method of claim 10 , wherein the solid support includes a substance selected from the group consisting of clay claim 10 , silica claim 10 , alumina claim 10 , glass beads claim 10 , functionalized polystyrene or organic polymers.12. A kit for generating chlorine dioxide comprising at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst and instructions to combine the at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst with ClO.14. The kit of claim 13 , wherein R claim 13 , R claim 13 , Rand Rare TDMBImp.15. The kit of claim 13 , wherein R claim 13 , R claim 13 , Rand Rare TM2PyP or R claim 13 , R claim 13 , Rand Rare TM4PyP.17. The kit of claim 12 , wherein ...

A Lignin-Containing Cellulose Nanofiber, a Paper and a Film Comprising the Said Lignin-Containing Cellulose Nanofiber

The present invention relates to a lignin-containing cellulose nanofiber characterized in that (a) the said lignin-containing cellulose nanofiber has a content of carboxyl group in a range of 0.2-1.5 mmol/g, (b) the said lignin-containing cellulose nanofiber has Zeta potential in a range of −100 to −35 mV, and (c) the said lignin-containing cellulose nanofiber has an average diameter in a range of 3-30 nm. In addition, the present invention further relates to a paper and a film comprising the said lignin-containing cellulose nanofiber. The present invention also relates to a process for preparing a lignin-containing cellulose nanofiber comprising steps of (i) treating a lignin-containing cellulosic material with an organic solvent, (ii) treating the cellulosic material treated from the step (i) with derivative of N-oxy radical compound and hypochlorite compound, and (iii) mechanical treating the cellulosic material treated from the step (ii). 1. A lignin-containing cellulose nanofiber wherein:(a) the said lignin-containing cellulose nanofiber has a content of carboxyl group in a range of 0.2-1.5 mmol/g(b) the said lignin-containing cellulose nanofiber has Zeta potential in a range of −100 to −35 mV, and(c) the said lignin-containing cellulose nanofiber has an average diameter in a range of 3-30 nm.2. The cellulose nanofiber according to claim 1 , wherein the said lignin-containing cellulose nanofiber preferably has the content of carboxyl group in the range of 0.4-0.7 mmol/g.3. The cellulose nanofiber according to ; wherein the said lignin-containing cellulose nanofiber preferably has Zeta potential in the range of −80 to −25 mV.4. The cellulose nanofiber according to claim 1 , wherein the said lignin-containing cellulose nanofiber preferably has the average diameter in the range of 5-21 nm.5. The cellulose nanofiber according to claim 1 , wherein the said lignin-containing cellulose nanofiber has a content of lignin in a range of 19-25% by weight claim 1 , ...

Bleaching and shive reduction process for non-wood fibers

The present invention is directed to a method for scouring and increasing the brightness of non-wood fibers. The method comprises forming a mixture of non-wood fibers, exposing the mixture to a scouring liquor and a scouring agent comprising oxygen gas to form a scouring mixture, and scouring the scouring mixture by radially circulating the scouring liquor throughout the scouring mixture to provide scoured fibers.

Method and apparatus for controlling the catalytic oxidation of cellulose

A method for controlling the catalytic oxidation of cellulose includes using a heterocyclic nitroxyl compound as catalyst oxidizing cellulose in a reaction mixture comprising liquid medium, the catalyst and hypochlorite as main oxidant analyzing one or more oxidative chlorine species dependent on the hypochlorite concentration of the reaction mixture on line in the reaction mixture or in a gas composition which is in contact with the reaction mixture; and controlling supply of hypochlorite to the reaction mixture on the basis of the analysis.

METHOD FOR BLEACHING PAPER PULP

The present invention relates to a method for bleaching an unbleached or pre-bleached paper pulp comprising at least the following consecutive steps: a) preparing an unbleached or pre-bleached paper pulp having a pH of at least 8, b) bringing the paper pulp obtained at the end of step a) into contact with chlorine dioxide, c) when the pH of the paper pulp obtained from step b) is lower than 10, adding at least one Brønsted base to the paper pulp, d) adding hydrogen peroxide to the paper pulp obtained at the end of step c), e) maintaining the paper pulp obtained at the end of step d) in a first bleaching tower, f) optionally, adding sulphuric acid to the paper pulp obtained at the end of step e) and maintaining the obtained paper pulp in a second bleaching tower, the method dispensing with the need for a step of washing the paper pulp before the end of step e), and, if applicable, before the end of step f). 1. A process for bleaching unbleached or pre-bleached paper pulp comprising at least the following successive steps:a) preparing an unbleached or pre-bleached paper pulp with a pH greater than or equal to 8,b) placing the paper pulp obtained at the end of step a) in contact with chlorine dioxide,c) when the pH of the paper pulp at the end of step b) is less than 10, add at least one Brønsted base to the paper pulp,d) adding hydrogen peroxide to the paper pulp,e) keeping the paper pulp obtained at the end of step d) in a first bleaching tower,where the process has no step of washing the paper pulp before the end of step e).2. The process according to claim 1 , wherein the process further comprises the following step f):f) at the end of step e), acidifying the paper pulp and keeping it in a second bleaching tower,where the process has no step of washing the paper pulp before the end of step f).3. The process according to claim 1 , wherein at least one cellulose protective agent and a chelating and/or sequestering agent are added during step a).4. The process ...

MODIFIED CELLULOSE FROM CHEMICAL KRAFT FIBER AND METHODS OF MAKING AND USING THE SAME

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them. 1247-. (canceled)248. A fluff pulp comprising a kraft fiber bleached according to a multi-stage bleaching process , wherein at least one stage of the bleaching process comprises oxidizing the kraft fiber with at least one peroxide and at least one catalyst under acidic conditions , wherein the at least one catalyst comprises copper or a combination of copper and iron , and wherein the kraft fiber has an aldehyde content ranging from about 1 meq/100 g to about 9 meq/100 g , a carboxyl content of at least about 3 meq/100 g , a 0.5% capillary CED viscosity of less than about 10 mPa·s an ISO brightness of at least about 88 , and a length-weighted average fiber length of at least about 2 mm.249. The fluff pulp of claim 248 , wherein the at least one catalyst comprises copper sulfate.250. The fluff pulp of claim 248 , wherein the at least one catalyst comprises a combination of a copper catalyst and an iron catalyst and the iron catalyst comprises at least one of ferrous sulfate claim 248 , ferrous chloride claim 248 , ferrous ammonium sulfate claim 248 , ferric chloride claim 248 , ferric ammonium sulfate claim 248 , and ferric ammonium citrate.251. The fluff pulp of claim 249 , wherein the copper sulfate is added in an amount ranging from about 100 to about 200 ppm copper based on the dry weight of the kraft fiber252. The fluff pulp of claim 250 , wherein the ...

CROSSLINKED KRAFT PULP COMPOSITIONS AND METHOD

Pulps in accordance with certain embodiments include crosslinked cellulose fibers and have high brightness, reactivity, and intrinsic viscosity, and therefore can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. Crosslinking the cellulose fibers can include exposing the fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. Another method in accordance with the present technology includes providing an aqueous suspension of pulp that includes chemical wood pulp fibers that were previously bleached and dried, crosslinking the fibers with such a glycidal ether crosslinker, and drying the pulp. 1. Pulp , comprising:crosslinked cellulose fibers, a resultant carboxymethyl cellulose (CMC) viscosity greater than or equal to 60 centipoise (cP),', 'a brightness greater than or equal to 75%, and', 'a water retention value (WRV) greater than or equal to 1.0 g/g., 'wherein the pulp has2. The pulp of claim 1 , wherein the pulp has:a resultant CMC viscosity greater than or equal to 60 cP,a brightness greater than or equal to 75%, anda WRV greater than or equal to 1.1 g/g.3. The pulp of claim 1 , wherein the pulp is a kraft pulp.4. The pulp of claim 1 , wherein the pulp is bleached.5. The pulp of claim 1 , wherein the pulp is at least partially insoluble in cupriethylenediamine (cuen).6. The pulp of claim 1 , further comprising less than or equal to 0.09% lignin by oven-dried weight of the crosslinked cellulose fibers.7. The pulp of claim 1 , further comprising greater than or equal to 10% hemicellulose by oven-dried weight of the crosslinked cellulose fibers.8. The pulp of claim 1 , having a resultant CMC ...

Softwood kraft fiber having improved whiteness and brightness and methods of making and using the same technical field

A bleached softwood kraft pulp fiber with high alpha cellulose content and increased brightness and whiteness is provided. Methods for making the kraft fiber and products made from it are also described. 113-. (canceled)14. A kraft pulp fiber made by a method comprising:digesting and oxygen delignifying a cellulose fiber to a kappa number of less than about 8; andbleaching the cellulose fiber in a multi-stage bleaching sequence;{'sub': '0', 'wherein the first stage of the multi-stage bleaching sequence is a chlorine dioxide Dstage wherein chlorine dioxide is applied in an amount of greater than about 1 chlorine dioxide on pulp.'}15. The kraft pulp fiber of claim 14 , wherein the ISO brightness of the fiber is at least about 91%.16. The kraft pulp fiber of claim 14 , wherein the CIE whiteness of the fiber is at least about 85.17. The kraft pulp fiber of claim 14 , wherein the CIE b* value of the fiber is less than about 2.5.18. The kraft pulp fiber of claim 14 , wherein the R18 value of the fiber is from about 87.5% to about 90%.19. The kraft pulp fiber of claim 14 , wherein the ISO brightness of the fiber is at least about 91% claim 14 , wherein the CIE whiteness of the fiber is at least about 85 claim 14 , and wherein the R18 value of the fiber is from about 87.5% to about 90%.20. The kraft pulp fiber of claim 14 , wherein the viscosity of the fiber is less than about 10 mPa·s.21. The kraft pulp fiber of claim 19 , wherein the viscosity of the fiber is less than about 10 mPa·s.22. A softwood kraft fiber having an ISO brightness of at least about 91% claim 19 , a CIE whiteness of the fiber of at least 85 claim 19 , and an R18 value from about 87.5% to about 90%.23. The kraft pulp fiber of claim 22 , wherein the CIE b* value of the fiber is less than about 2.5.24. The kraft pulp fiber of claim 22 , wherein the viscosity of the fiber is less than about 10 mPa·s. This disclosure relates to softwood, more particularly southern pine, kraft fiber having improved whiteness ...

ODOR CONTROL PULP COMPOSITION

The present technology is directed to fluff pulps with improved odor control as well as methods of making such fluff pulps. A fluff pulp is provided that includes a bleached kraft fiber and a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. The bleached kraft fiber includes a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of more than about 3.5 meq/100 grams; an ISO brightness of at least 80; and a viscosity from about 2 cps to about 9 cps. 1. A fluff pulp comprising: a length-weighted average fiber length of at least about 2 mm;', 'a copper number of less than about 7; and', 'a ISO brightness of at least 80, and, 'bleached kraft fiber comprising'}a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.2. The fluff pulp of claim 1 , wherein copper ions of the copper ion content comprise a copper (I) salt claim 1 , a copper (II) salt claim 1 , hydrates thereof claim 1 , or a combination of any two or more thereof.3. The fluff pulp of claim 1 , wherein copper ions of the copper ion content comprise one or more of elemental copper claim 1 , copper (I) chloride claim 1 , copper (I) oxide claim 1 , copper (I) sulfate claim 1 , copper (II) carbonate claim 1 , copper (II) chloride claim 1 , copper (II) phosphate claim 1 , copper(II) nitrate claim 1 , copper (II) perchlorate claim 1 , copper (II) phosphate claim 1 , copper (II) sulfate claim 1 , copper (II) tetrafluoroborate claim 1 , and copper (II) triflate.4. The fluff pulp of claim 1 , wherein the fluff pulp further comprises iron ions.5. The fluff pulp of claim 4 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.6. The fluff pulp of claim 1 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP).7. The fluff pulp of claim 1 , wherein the fluff pulp has a carboxyl content of ...

Bleaching Trichomes to Remove Proteins

A process for bleaching trichome fibers individualized from a trichome source, such as a leaf and/or a stem, is disclosed. The process of bleaching degrades trichome associated protein. Further, the bleaching processes improves the color of the trichomes. 1. A process of treating individualized trichomes to remove proteins , whereby the process comprises:a. selecting a trichome containing biomass;b. individualizing the trichomes from the biomass, wherein the trichomes have a protein content;c. wetting the trichomes;d. reacting the trichomes with a reactant comprising at least one one of a chlorite, a peroxide, and a peracid;e. removing the trichomes from the reaction; andf. measuring the protein content of the reacted trichomes;wherein protein present in the individualized trichomes is reacted with the reactant to break down the protein via oxidation, yielding individualized trichomes with less than 0.1% protein by weight of molecular weight greater than 3,500 daltons.2. The process of wherein the peracid is peracetic acid.3. The process of wherein peracetic acid is generated by reacting N claim 2 ,N claim 2 ,N′ claim 2 ,N′-Tetraacetylethylenediamine with hydrogen peroxide.4. The process of wherein the temperature of the reacting step d is maintained above 20° C.5. The process of wherein the pH of the reacting step d is maintained above 5.0.6. The process of wherein the reaction of the reacting step d is for greater than 1 minute.7Stachys byzantina.. The process of wherein the biomass is from8. A process of treating individualized trichomes to remove proteins claim 1 , whereby the process comprises:a. selecting a trichome containing biomass;b. individualizing the trichomes from the biomass, wherein the trichomes have a protein content;c. wetting the trichomes;d. reacting the trichomes with a first reactant;e. reacting the trichomes with a second reactant;f. removing the trichomes from the second reaction; andg. measuring the protein content of the reacted trichomes; ...

Product and processes from an integrated forest biorefinery

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.

Methods for carbonate pretreatment and pulping of cellulosic material

A method of pretreating comminuted fibrous material with sodium carbonate and then cooking the pretreated material in the presence of anthraquinone (AQ) is provided. The resulting pulp produced has a higher yield, enhanced strength, and better bleachability compared to pulp produced by prior art methods. AQ may also be introduced to the carbonate pretreatment stage. The method may further include an acid pretreatment providing further enhanced properties to the pulp produced.

一种减少蔗渣浆二氧化氯漂白过程aox形成量的方法

本发明涉及一种减少蔗渣浆二氧化氯漂白过程AOX形成量的方法。主要特征是：包括以下步骤：(1)高温酸预处理段；(2)生物酶预处理段；(3)二氧化氯漂白段。本发明通过对未漂蔗渣浆进行高温酸预处理主要是为了去除未漂浆中存在的己烯糖醛酸，而生物酶的使用是为了去除纤维表面部分的半纤维素，使残余木素更多地暴露出来，可保证二氧化氯漂白工段中使用的二氧化氯更少，减少漂白过程中生成的AOX。蔗渣浆经高温酸预处理和生物酶预处理共同作用后，二氧化氯用量节约了15％-30％，AOX的形成量减少了20％-40％。

Method of controlling the process of oxygen bleaching of pulp

A method for controlling an oxygen-bleaching process of lignocellulosic pulp to a desired degree of delignification. The pulp is passed at a substantially constant temperature into a bleaching reactor wherein the pulp has a substantially constant level at its outlet. The hydrostatic pressure is measured and the quantity of oxygen fed into the reactor is adjusted to reach a desired degree of delignification.

牛皮纸浆用清洗剂及使用其的牛皮纸浆的制造方法

本发明的牛皮纸浆用清洗剂，用于在用氧对被蒸解的纸浆原料中含有的木质素成分进行分解后，清洗上述纸浆原料，其特征在于，所述清洗剂含有一种非离子性表面活性剂，所述非离子性表面活性剂是选自下述通式(1)、(2)及(3)所示的化合物的至少一种的非离子性表面活性剂，所述非离子性表面活性剂的浊点低于清洗上述纸浆原料时的清洗温度。R 1 O-(PO) n -[(EO) m ·(PO) k ]H 通式(1)R 2 -CO-(AO) y -OR 3 通式(2)

Preparation and purification of poly(tetramethylene ether) formal glycols and poly(oxybutylene formal) glycols

Oligomeric formal diols are prepared by coupling segments of poly(tetramethylene ether) glycols, each having a molecular weight of 650-3000, with formaldehyde in the presence of a granular acidic catalyst, to yield poly(tetramethylene ether) formal glycols of 1,400-12,000 molecular weight. Oligomeric formal diols of a second type can also be prepared by coupling with formaldehyde segments of poly(tetramethylene ether) glycols mixed with segments of other polymeric glycols, as for example polyethylene oxide glycol of 200 molecular weight, to yield poly(ether formal) glycols of substantially higher molecular weight than either of the starting polyether glycols, and having properties significantly different from the parent polyether glycols that may affect the performance as soft or elastomeric segments of derived polyurethanes, polyetheresters, and polyureas. Yet a third type of oligomeric formal diols can be prepared by coupling monomeric diols, as for example 1,4-butanediol, with formaldehyde to yield higher molecular weight poly(oxybutylene formal) glycols.

Process for the production of chlorine dioxide

USE OF SURFACE-ACTIVE SUBSTANCE FOR PROCESSING PULPES AND IMPROVING THE INTRODUCTION OF KRAFT PULPES IN FIBER TO OBTAIN VISCOSE AND OTHER SECONDARY FIBROUS PRODUCTS

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2017 128 939 A (51) МПК D21C 3/26 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2017128939, 05.04.2013 (71) Заявитель(и): ДжиПи СЕЛЛЬЮЛОУС ГМБХ (CH) Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 04.02.2019 Бюл. № 04 (72) Автор(ы): НОННИ Артур Джеймс (US), КУРШЕН Чарльз Эдвард (US), СЛОУН Кристофер Майкл (US), КЕМПБЕЛЛ Филип Рид (US), ДАУДЛ Стивен Чэд (US), ЭНГЛ Джоэл Марк (US) A 2 0 1 7 1 2 8 9 3 9 (57) Формула изобретения 1. Крафт-волокно пульпы, имеющее ISO степень белизны, по меньшей мере, примерно 92%, CIE белизну, по меньшей мере, примерно 85, и значение R18 от примерно 84% до примерно 91%, и поверхностно-активное вещество. 2. Крафт-волокно пульпы по п. 1, в котором волокно пульпы является волокном пульпы из мягкой древесины. 3. Крафт-волокно пульпы по п. 1 или 2, в котором волокно пульпы имеет CIE белизну по меньшей мере примерно 86. 4. Крафт-волокно пульпы по любому из пп. 1-3, в котором волокно пульпы имеет значение R18 примерно 88%. 5. Крафт-волокно пульпы по любому из пп. 1-4, в котором волокно пульпы имеет общее карбонильное содержание менее примерно 2,5 ммоль/100 г. 6. Крафт-волокно пульпы по любому из пп. 1-5, в котором волокно пульпы имеет CED-вязкость менее примерно 5 мПа.с. 7. Крафт-волокно пульпы по любому из пп. 1-6, в котором волокно пульпы имеет b*-значение в насыщенном NaOH состоянии менее 30. 8. Крафт-волокно пульпы по любому из пп. 1-7, в котором волокно имеет значение b* менее примерно 25. 9. Крафт-волокно пульпы по любому из пп. 1-8, в котором поверхностно-активное вещество представляет собой катионогенное поверхностно-активное вещество. 10. Крафт-волокно пульпы по любому из пп. 1-9, в котором поверхносто-активное Стр.: 1 A R U (54) ИСПОЛЬЗОВАНИЕ ПОВЕРХНОСТНО-АКТИВНОГО ВЕЩЕСТВА ДЛЯ ОБРАБОТКИ ПУЛЬПЫ И УЛУЧШЕНИЕ ВВЕДЕНИЯ КРАФТ-ПУЛЬПЫ В ВОЛОКНО ДЛЯ ПОЛУЧЕНИЯ ВИСКОЗЫ И ДРУГИХ ВТОРИЧНЫХ ВОЛОКНИСТЫХ ПРОДУКТОВ 2 0 1 7 1 2 ...

Oxygen delignification of lignocellulosic material

본 발명은 두 단계의 산소 탈리그닌화 플랜트(plant)의 한 단계가 제거된, 펄프를 탈리그닌화하는 방법을 형성한다. 특히, 펄프 침지 단계는 펄프로부터 착색 물질을 알칼리 가수분해 여과하고 펄프 섬유를 팽창시키기 위하여 펄프 스트림이 알칼리 공급물과 함께 혼합되어 충분한 기간 동안 체류될 수 있게 한다. 그 다음에, 펄프 스트림은 산소 공급물과 혼합되어 믹서를 통하여 처리된다. 그 믹서의 산출물이 산소가 펄프 섬유의 리그닌과 반응하는 가압된 반응기에 공급된다. 팽창된 펄프 섬유는 산소의 리그닌과의 반응 및 추가적인 착색 물질의 제거를 촉진한다. The present invention forms a process for delignifying pulp in which one stage of a two stage oxygen delignification plant is removed. In particular, the pulp soaking step allows the pulp stream to be mixed with the alkali feed and stay for a sufficient period of time in order to alkali hydrolyze the colored material from the pulp and expand the pulp fibers. The pulp stream is then mixed with an oxygen feed and processed through a mixer. The output of the mixer is fed to a pressurized reactor where oxygen reacts with lignin of the pulp fibers. The expanded pulp fibers promote the reaction of oxygen with lignin and the removal of additional colored material.

CATALYTIC CARBOXYLATION OF CELLULOSE FIBERS IN A CONTINUOUS PROCESS WITH REPEATED ADDITIVES OF THE CATALYST, SECONDARY OXIDIZER AND BASIS IN MOVING LIQUID GREEN POWDER

1. Способ изготовления стабильной волокнистой карбоксилированной целлюлозы, который включает:карбоксилирование волокон целлюлозы из древесной массы в водной щелочной суспензии путем каталитического карбоксилирования волокон по меньшей мере на двух ступенях каталитического карбоксилирования, при котором ступени каталитического карбоксилирования расположены последовательно, и каждая последующая ступень каталитического карбоксилирования далее карбоксилирует карбоксилированные волокна с предыдущей ступени каталитического карбоксилирования, ина первую ступень каталитического карбоксилирования подают прекурсор первичного окислителя, активный катализатор - оксаммониевую соль, выбираемый из группы, состоящей из гетероциклических нитроксидов, соответствующих им гидроксильных аминов или соответствующих им аминов, стабильных в водных щелочных условиях, у которых атомы углерода рядом с азотом нитроксида не имеют водородных замещений, и их смесей, вторичный окислитель для регенерации активного катализатора; и достаточное количество щелочного материала для того, чтобы волокна находились при щелочном pH 8-11 в начале ступени каталитического карбоксилирования для карбоксилирования волокон целлюлозы; ина каждой последующей ступени каталитического карбоксилирования подают дополнительные количества прекурсора активного катализатора, вторичного окислителя и щелочной материал для регулировки рН до 8-11, чтобы далее карбоксилировать волокна целлюлозы с предыдущей ступени каталитического карбоксилированияпричем волокна целлюлозы имеют уровень карбоксилирования от 18 до 100 мэкв на 100 г целлюлозы печной РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2012 141 503 A (51) МПК C08J 5/20 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2012141503/05, 28.09.2012 (71) Заявитель(и): ВЕЙЕРХОЙЗЕР НР КОМПАНИ (US) Приоритет(ы): (30) Конвенционный приоритет: (72) Автор(ы): Уирэварна Ананда С. (US) 30.09.2011 US 61/541,753 Адрес для переписки: 129090, ...

Method for producing chemi-mechanical pulp and semi-chemical pulp

本发明涉及一种在酸性条件下处理木材或农业秸秆植物原料生产化机浆或半化学浆的方法，该方法还包括酸的回收和废液中半纤维素糖和木素的后续利用。其中，纸浆生产是在温和常压环境下利用甲酸/甲酸盐水溶液润涨软化植物原料并适度脱除木素和半纤维素。软化后的原料进行水力疏解和机械磨浆，制备出化机浆或半化学浆。在纸浆和废液的干燥过程中，实现甲酸的回收并联产甲酸盐，本发明还提供了废液中木素和半纤维素的分离方法和后续利用途径。本方法涉及的制浆在酸性条件下进行，不同于现行化机浆或半化学浆在碱性环境下生产的方法。该发明能够保证植物原料的所有成分得到分离利用，并且化学品得到回用，具有很好的资源利用效益和环境效益。

Silica composition

The invention relates to a composition comprising a mixture of a silica compound and an alkaline earth metal oxide or alkaline earth metal hydroxide in an aqueous solvent, characterised in that the silica compound and the alkaline earth metal oxide or alkaline earth metal hydroxide together form the major part of the non-solvent matter of the composition. The invention also relates to a method for producing said composition comprising adding an alkaline earth metal oxide or alkaline earth metal hydroxide and a silica compound to an aqueous medium to form an aqueous mixture, and allowing said aqueous mixture to stand. The invention also relates to a method for treating cellulosic fibres using said composition.

Silica composition

The invention relates to a composition comprising a mixture of a silica compound and an alkaline earth metal oxide or alkaline earth metal hydroxide in an aqueous solvent, characterised in that the silica compound and the alkaline earth metal oxide or alkaline earth metal hydroxide together form the major part of the non-solvent matter of the composition. The invention also relates to a method for producing said composition comprising adding an alkaline earth metal oxide or alkaline earth metal hydroxide and a silica compound to an aqueous medium to form an aqueous mixture, and allowing said aqueous mixture to stand. The invention also relates to a method for treating cellulosic fibres using said composition.

Silica composition

The invention relates to a composition comprising a mixture of a silica compound and an alkaline earth metal oxide or alkaline earth metal hydroxide in an aqueous solvent, characterised in that the silica compound and the alkaline earth metal oxide or alkaline earth metal hydroxide together form the major part of the non-solvent matter of the composition. The invention also relates to a method for producing said composition comprising adding an alkaline earth metal oxide or alkaline earth metal hydroxide and a silica compound to an aqueous medium to form an aqueous mixture, and allowing said aqueous mixture to stand. The invention also relates to a method for treating cellulosic fibres using said composition.

METHODS OF ENHANCING PRINTING QUALITY OF PIGMENT COMPOSITIONS ONTO COTTON FABRICS

본 발명은 면함유직물의 프린팅 특성을 향상시키는 방법에 관한 것이다. 특히, 본 발명은 면함유직물을 프린팅 하기전에 직물을 셀룰라아제로 전처리하여 안류흡수도, 선명도, 안료블리딩등과 같은 직물의 트린팅 특성을 향상시킨다. 본 방법은 일반적으로 수성셀룰라아제 제제, 바람직하게는 교반조건하의 수성셀룰라아제 용액에 의한 면함유직물의 처리를 수반한다.

METHODS FOR CARBONATE PRELIMINARY TREATMENT AND CELLING OF CELLULOSE MATERIAL

1. Способ обработки измельченного целлюлозного волокнистого материала, включающий в себя: a) обработку целлюлозного волокнистого материала свободным от серы карбонатсодержащим раствором с получением предварительно обработанного целлюлозного материала; и b) обработка предварительно обработанного целлюлозного материала варочным химикатом в течение достаточного времени и при достаточной температуре с получением целлюлозной массы; в котором, по крайней мере, в одном из a) и b) целлюлозный волокнистый материал обрабатывается антрахиноном. ! 2. Способ по п.1, в котором целлюлозный волокнистый материал обрабатывается антрахиноном в а). ! 3. Способ по п.1 или 2, в котором предварительно обработанный целлюлозный волокнистый материал обрабатывается антрахиноном в b). ! 4. Способ по какому-либо одному из пп.1 и 2, в котором карбонатсодержащий раствор включает в себя карбонат натрийсодержащий раствор. ! 5. Способ по п.4, в котором раствор, содержащий карбонат натрия, включает от 1 до 12% карбоната натрия из расчета Na2O на древесную щепу, предпочтительно от 2 до 9% карбоната натрия из расчета Na2O на древесную щепу и обработку осуществляют от 15 до 120 мин при температуре между 120°C и 200°C. ! 6. Способ по п.5, в котором раствор, содержащий карбонат натрия, включает от 2 до 7% карбоната натрия из расчета Na2O на древесную щепу, и обработку осуществляют от 15 до 120 мин при температуре между 120°C и 170°C. ! 7. Способ по п.1, в котором свободный от серы карбонатсодержащий раствор включает в себя свободный от серы раствор карбоната натрия. ! 8. Способ по какому-либо одному из пп.1, 2 или 7, в котором варочный химикат включает в себя гидроксид натрия. ! 9. Способ по каком� РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2008 150 352 (13) A (51) МПК D21C 3/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21), (22) Заявка: 2008150352/12, 17.05.2007 (71) Заявитель(и): ДЗЕ РИСЕРЧ ФАУНДЕЙШН ОФ СТЕЙТ ЮНИВЕРСИТИ ОФ НЬЮ ЙОРК (US) ...

With acid bleaching sequence manufacture high functionalization's low-viscosity sulfur silicate fiber method and thus technique manufacture fiber

一种纸浆纤维，其具有增强的羰基含量，产生改善的抗微生物性、抗黄变性和吸收性。还记载了制造硫酸盐浆纤维的方法以及由其制得的产品。

Catalytic carboxylation of cellulose fibers in a continuous process

通过在至少两个串联的催化羧化级中催化羧化纤维素纤维来制造羧化纤维，其中在每个级开始时添加初级催化剂和次级氧化剂，如有必要的话，还有pH调节剂。

METHOD FOR PRODUCING HIGH-FUNCTIONAL LOW-VARIABLE KRAFT FIBER USING ACID BLEACHING SEQUENCE AND FIBER MADE USING THIS PROCESS

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2015 142 979 A (51) МПК D21C 3/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2015142979, 24.02.2014 (71) Заявитель(и): ДжиПи СЕЛЛЬЮЛОУС ГМБХ (CH) Приоритет(ы): (30) Конвенционный приоритет: 14.03.2013 US 61/785,075 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 14.10.2015 R U (43) Дата публикации заявки: 17.04.2017 Бюл. № 11 (72) Автор(ы): НОННИ Артур Дж. (US), КУРШЕН Чарльз Э. (US) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2014/140852 (18.09.2014) R U (54) СПОСОБ ИЗГОТОВЛЕНИЯ ВЫСОКОФУНКЦИОНАЛЬНОГО МАЛОВЯЗКОГО КРАФТВОЛОКНА С ИСПОЛЬЗОВАНИЕМ ПОСЛЕДОВАТЕЛЬНОСТИ КИСЛОТНОГО ОТБЕЛИВАНИЯ И ВОЛОКНО, ИЗГОТОВЛЕННОЕ С ПОМОЩЬЮ ЭТОГО ПРОЦЕССА (57) Формула изобретения 1. Способ для изготовления крафтцеллюлозы, включающий в себя: гидролиз и кислородную делигнификацию крафтцеллюлозной массы; отбеливание крафтцеллюлозной массы с использованием многостадийного процесса отбеливания; и окисление крафтцеллюлозы во время по меньшей мере двух стадий перекисью и катализатором в кислотных условиях; причем эти по меньшей мере две стадии могут осуществляться до последовательности отбеливания, в ходе последовательности отбеливания, после последовательности отбеливания или в комбинации этого. 2. Способ по п. 1, в котором крафтцеллюлозная масса представляет собой волокно южной сосны. 3. Способ по п. 1, в котором катализатор выбирается по меньшей мере как одно из меди и железа, и значение pH стадии окисления составляет от приблизительно 2 до приблизительно 6. 4. Способ по п. 3, в котором катализатор является железом и присутствует в количестве от приблизительно 50 частей на миллион до приблизительно 150 частей на миллион, а перекись является перекисью водорода и присутствует в количестве от 0,5% до приблизительно 3,0%. 5. Способ по п. 1, в котором окисление выполняется на второй и четвертой стадиях Стр.: 1 A 2 0 1 5 1 4 2 9 7 9 A Адрес для переписки: 129090, Москва, ул. Б. ...

A kind of method that wealthy mixed sulfate element chlorine free bleaching chemical pulp of needle prepares paper substrate

本发明公开了一种针阔混合硫酸盐无元素氯漂白化学浆制备纸基的方法，包括如下步骤：1)将硫酸盐法蒸煮得到的针阔混合浆作为纸浆原料，分为三份，分别打浆，第一种纸浆的打浆度为10‑20°SR，第二种纸浆的打浆度为45‑50°SR，第三种纸浆的打浆度为55‑65°SR；2)将步骤1)中制备的三种纸浆按一定比例混合，得到混合浆料，使混合浆料中第一种纸浆、第二种纸浆和第三种纸浆的质量比为10‑20:60‑85:5‑10；3)将步骤2)中得到的混合浆料抄制成型或压制成型，得到纸基材料。

Stabilized gas-enriched and gas-supersaturated liquids

A gas-enriched liquid delivered at a site of interest that is substantially bubble free after delivery into a lower pressure liquid or gas environment. The delivered gas-enriched liquid is produced by a process comprising the steps of: a) preparing a mixture of gas and liquid; b) compressing the mixture to a pressure such that the gas completely dissolves in the liquid to form a gas-enriched liquid; c) enclosing the gas-enriched liquid within a confined space while retaining substantially the same pressure. The confined space has at least one dimension less than about 0.2 mm, and has at least one opening to a liquid or gas environment site of interest having a lower pressure than that of the pressure of the confined space; and d) delivering the gas-enriched liquid from the confined space out through the at least one exit opening to the lower pressure environment without formation of bubbles.

Bleaching method of lignocellulosic material with improved environmental pollution

내용 없음

Low viscosity kraft fibre having higher carboxyl content and methods of making and using same

FIELD: paper. SUBSTANCE: methods for making kraft pulp fibre and products made therefrom are described. EFFECT: pulp fibre with higher carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. 41 cl, 4 tbl, 6 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 661 836 C2 (51) МПК B21C 9/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК B01J 20/24 (2006.01); C08B 15/00 (2006.01); C08B 15/04 (2006.01); D21C 3/02 (2006.01); D21C 9/004 (2006.01); D21C 9/142 (2006.01); D21C 9/147 (2006.01); D21C 9/163 (2006.01); D21H 11/20 (2006.01) (21)(22) Заявка: 2015143174, 12.03.2014 12.03.2014 Дата регистрации: (73) Патентообладатель(и): ДжиПи СЕЛЛЬЮЛОУС ГМБХ (CH) 19.07.2018 (56) Список документов, цитированных в отчете о поиске: EP 1505198 A1, 09.02.2009. WO 01/ 15.03.2013 US 61/787,146 (43) Дата публикации заявки: 20.04.2017 Бюл. № 11 29309 A1, 26.04.2001. WO 00/39389 A1, 06.07.2000. US 5441603 A, 15.08.1995. (45) Опубликовано: 19.07.2018 Бюл. № 20 (86) Заявка PCT: IB 2014/001272 (12.03.2014) C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 15.10.2015 (87) Публикация заявки PCT: WO 2014/140940 (18.09.2014) 2 6 6 1 8 3 6 2 6 6 1 8 3 6 Приоритет(ы): (30) Конвенционный приоритет: R U R U (24) Дата начала отсчета срока действия патента: (72) Автор(ы): НОННИ Артур Дж. (US), КУРШЕН Чарльз Э. (US), КАРТЕР Блэр Родерик (US) Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, строение 3, ООО "Юридическая фирма Городисский и Партнеры" (54) КРАФТ-ВОЛОКНО С НИЗКОЙ ВЯЗКОСТЬЮ, ИМЕЮЩЕЕ ПОВЫШЕННОЕ СОДЕРЖАНИЕ КАРБОКСИЛЬНЫХ ГРУПП, И СПОСОБЫ ЕГО ПОЛУЧЕНИЯ И ПРИМЕНЕНИЯ (57) Реферат: Целлюлозное волокно с повышенным абсорбционным свойствам. Также описаны содержанием карбоксильных групп, приводящим способы изготовления целлюлозного крафтк улучшенным антимикробным свойствам, волокна и выполненные из него изделия. 2 н. и 39 характеристикам стойкости к пожелтению и з.п. ф-лы, 4 табл., 6 ...

Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp

Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 18%, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The total amount of alkaline material applied to the pulp is between 0.8 and 7% by weight of oven dry pulp. High strength, low lignin pulps are subsequently formed which may be further bleached to high brightness with reduced amounts of chemicals.

Method of making pulp having high hemicellulose content

Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.

Cellulose pulp having increased hemicellulose content

Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.

Method of producing dissolving pulp, dissolving pulp and use of method

Methods for carbonate pretreatment and pulping of cellulosic material

A method of pretreating comminuted fibrous material with sodium carbonate and then cooking the pretreated material in the presence of anthraquinone (AQ) is provided. The resulting pulp produced has a higher yield, enhanced strength, and better bleachability compared to pulp produced by prior art methods. AQ may also be introduced to the carbonate pretreatment stage. The method may further include an acid pretreatment providing further enhanced properties to the pulp produced.

Method for preparing high-yield dissolving pulp by using eutectic solvent

本发明公开了一种低共熔溶剂制备高得率溶解浆的方法，包括如下步骤：将低共熔溶剂与木质纤维生物质进行混合后，在加热条件下进行预处理，预处理得到的混合物经过固液分离后得到滤液和固体物料；去除滤液中的溶质得到低共熔溶剂回收液，低共熔溶剂回收液能够再次用于对固体物料进行预处理；固体物质经过洗涤、干燥后得到预处理物料；对预处理物料进行蒸煮处理，得到蒸煮浆料；对蒸煮浆料进行漂白处理，漂白处理后的固体经过洗涤、干燥后得到溶解浆。本发明利用低共熔溶剂对木质纤维生物质进行预处理，能够减少溶解浆中半纤维素含量和木质素含量，减少了蒸煮和漂白过程中药品的使用量，且低共熔溶剂可回收利用，降低生产成本。

MODIFIED CELLULOSE FROM CHEMICAL CRAFT FIBER AND METHODS OF ITS PRODUCTION AND USE

А 2016122607 ко РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) (11) 3% 3% < < а а < 2% (13) С < 5 А (50) МПК 021С 500 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2016122607, 08.06.2016 (71) Заявитель(и): ДжиПи СЕЛЛЬЮЛОУС ГМБХ (СН) Приоритет(ы): (30) Конвенционный приоритет: 28.05.2009 95 61/182,000 (62) Номер и дата подачи первоначальной заявки, из которой данная заявка выделена: 2014142821 23.10.2014 (72) Автор(ы): НОННИ Артур, Дж. (05), КУРШЕН Чарльз Э. (05), СЛОУН Кристофер Майкл (05), АБИЦ Питер Р. (05) (43) Дата публикации заявки: 13.12.2017 Бюл. № 35 Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, стр. 3, ООО "Юридическая фирма Городисский и Партнеры" (54) МОДИФИЦИРОВАННАЯ ЦЕЛЛЮЛОЗА ИЗХИМИЧЕСКОГО КРАФТ-ВОЛОКНА И СПОСОБЫ ЕГО ИЗГОТОВЛЕНИЯ И ИСПОЛЬЗОВАНИЯ (57) Формула изобретения 1. Способ получения крафт-волокна, включающий: отбеливание крафт-целлюлозы с использованием многостадийного процесса отбеливания и окисления крафт-целлюлозы во время осуществления двух стадий многостадийного процесса отбеливания, где каждая стадия окисления включает окисление с использованием перекиси и катализатора в кислой среде; и где многостадийный процесс отбеливания включает, по меньшей мере, одну стадию отбеливания, следующую после двух стадий окисления. 2. Способ по п. 1, в котором катализатор выбирают, по меньшей мере, из одного катализатора: меди или железа. 3. Способ по п.1 или 2, в котором перекись представляет собой перекись водорода. 4. Способ по п.3, в котором катализатором является железо. 5. Способ по п.4, в котором значение рН на стадии окисления от около 2 до около 6. 6. Способ по п.5, в котором катализатор выбирают, по меньшей мере, из одного катализатора: сульфата железа, дихлорида железа, железоаммиачных квасцов, хлорида железа, железоаммониевых квасцов или двойной соли лимонно-кислого железа и лимонно-кислого аммония. 7. Способ по п.б, в котором катализатором является железо и его добавляют в количестве от около ...

Use of surfactants for pulp processing and improvement of craft pulp introduction in fibre for obtaining viscoose and other secondary fibre products

FIELD: chemistry.SUBSTANCE: craft pulp fibre from bleached softwood processed with the surfactant is considered, that is used as a starting material, to obtain the derivatives of cellulose including simple cellulose ether, cellulose esters and viscose. Methods for obtaining fibre from craft pulp and products made from it are also contemplated.EFFECT: improved properties.23 cl, 5 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 636 306 C2 (51) МПК D21C 3/26 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2014146173, 05.04.2013 (24) Дата начала отсчета срока действия патента: 05.04.2013 Дата регистрации: Приоритет(ы): (30) Конвенционный приоритет: (73) Патентообладатель(и): ДжиПи СЕЛЛЬЮЛОУС ГМБХ (CH) 18.04.2012 US 61/635,185 (45) Опубликовано: 21.11.2017 Бюл. № 33 (56) Список документов, цитированных в отчете о поиске: WO 2010/138941 A2, 02.12.2010. WO 2009/093615 A1, 30.07.2009. JP 2003096681 A, 03.04.2003. (85) Дата начала рассмотрения заявки PCT на национальной фазе: 18.11.2014 (86) Заявка PCT: US 2013/035494 (05.04.2013) (87) Публикация заявки PCT: 2 6 3 6 3 0 6 (43) Дата публикации заявки: 10.06.2016 Бюл. № 16 R U 21.11.2017 (72) Автор(ы): НОННИ Артур Джеймс (US), КУРШЕН Чарльз Эдвард (US), СЛОУН Кристофер Майкл (US), КЕМПБЕЛЛ Филип Рид (US), ДАУДЛ Стивен Чэд (US), ЭНГЛ Джоэл Марк (US) (54) ИСПОЛЬЗОВАНИЕ ПОВЕРХНОСТНО-АКТИВНОГО ВЕЩЕСТВА ДЛЯ ОБРАБОТКИ ПУЛЬПЫ И УЛУЧШЕНИЕ ВВЕДЕНИЯ КРАФТ-ПУЛЬПЫ В ВОЛОКНО ДЛЯ ПОЛУЧЕНИЯ ВИСКОЗЫ И ДРУГИХ ВТОРИЧНЫХ ВОЛОКНИСТЫХ ПРОДУКТОВ (57) Реферат: Рассматривается обработанное поверхностнопростой эфир целлюлозы, сложные эфиры активным веществом волокно из крафтцеллюлозы и вискозу. Также рассматриваются целлюлозы из отбеленной мягкой древесины, способы получения волокна из крафт-целлюлозы используемое в качестве исходного материала, и продуктов, выполненных из него. 3 н. и 20 з.п. для получения производных целлюлозы, включая ф-лы, 5 ил. R U 2 6 3 6 3 0 6 Адрес для переписки: ...

Method and apparatus for sulfate boiling of ground cellulose fibrous material

FIELD: pulp-and-paper industry. SUBSTANCE: method involves feeding ground cellulose fibrous material in white sulfate liquor into upper section of boiling flow; extracting black sulfate liquor from at least one region between upper and central sections of boiler; discharging and recirculating liquid in recirculation circuit in boiler central section; adding washing liquid in lower section of boiler and discharging kraft-pulp from lower section. Liquid is discharged from lower section and recirculated in washing recirculation circuit while white sulfate liquor is added. Recirculated liquor is ascended in boiler in countercurrency to material flow, with amount of added liquor and temperature mode in washing circuit being regulated. EFFECT: increased efficiency and improved quality of boiled material. 9 cl, 3 dwg, 1 tbl у69630с ПЧ ГЭ РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МПК ВИ” 2 089 694 ' 13) С1 О 21С 3/02, 7/00 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 5001635/12, 16.09.1991 (30) Приоритет: 17.09.1990 Ш$ 07/583,043 (46) Дата публикации: 10.09.1997 (56) Ссылки: Шитов Ф.А. Технология целлюлозно-бумажного производства. - М.: Лесная промышленность, 1971, с. 105 - 107. (71) Заявитель: Камир, Инк (Ц$) (72) Изобретатель: Бертил Стромберг[[$Е], Джиан ДжиангГ ПМ, Ричард Лааксо[СА], Джозеф Филлипс[Ц$], Брайан Гринвуд[И$], Джеймс Р.Праф[И$] (73) Патентообладатель: Камир, Инк (05$) (54) СПОСОБ НЕПРЕРЫВНОЙ СУЛЬФАТНОЙ ВАРКИ ИЗМЕЛЬЧЕННОГО ЦЕЛЛЮЛОЗНОГО ВОЛОКНИСТОГО МАТЕРИАЛА И УСТРОИСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ (57) Реферат: Изобретение относится способу непрерывной сульфатно варки измельченного целлюлозного волокнистого материала и устройства для его осуществления и предназначено к использованию в — целлюлозно-бумажной промышленности. Сущность изобретения состоит в том, что способ включает подачу измельченного целлюлозного волокнистого материала в сульфатном белом щелоке в верхнюю секцию варочного потока, экстрагирование ...

CHEMICAL CELLULOSE BLEACH METHOD

1. Способ отбелки химической целлюлозы, в котором начальная отбелка целлюлозы включает первую обработку диоксидом хлора (D0), включающую также добавление щелочи в целлюлозу после добавления диоксида хлора, и последующую щелочную обработку кислородом и пероксидом водорода (EOP), причем указанная обработка отделена от указанной первой обработки стадией промывки, при этом указанный способ включает, кроме того, обработку целлюлозы для уменьшения содержания переходных металлов в целлюлозе до указанной обработки пероксидом, в соответствии с чем начальная отбелка содержит последовательность D0N EOF, отличающийся тем, что pH целлюлозы указанным добавлением щелочи устанавливают на значение от 8 до 11 перед указанной стадией промывки, таким образом органические вещества в целлюлозе растворяются и будут удалены из целлюлозы на указанной стадии промывки как фильтрат, содержащий также большую часть образованных хлоридов, причем не допускается поступление этого фильтрата в систему утилизации, и содержание хлоридов в фильтрате со стадии промывки после указанной стадии EOP снижается. ! 2. Способ по п.1, отличающийся тем, что обработка целлюлозы для удаления переходных металлов состоит в кислотной обработке (A) целлюлозы и следующей промывки перед стадией D0N, в соответствии с чем последовательность стадий начальной отбелки есть A D0N EOP. ! 3. Способ по п.1, отличающийся тем, что на стадии D0N добавляют щелочь в количестве от 1 до 20 кг, в виде NaOH. ! 4. Способ по п.1, отличающийся тем, что на стадии D0N, продолжительность щелочной обработки составляет от 5 с до 60 мин. ! 5. Способ по п.1, отличающийся тем, что для добавления щелочи используют гидроксид РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2008 143 245 (13) A (51) МПК D21C 9/14 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21), (22) Заявка: 2008143245/12, 27.03.2007 (71) Заявитель(и): ОЙ ЛЯННЕН ТУТКИМУС - ВЕСТЕРН РИСЕРЧ ИНК (FI) (30) Конвенционный приоритет: 31. ...

Modified cellulose from chemical kraft fiber and methods of making and using the same

본 발명은 독특한 특성을 갖는 변형된 크래프트 펄프 섬유를 제공한다. 변형된 섬유는 이것이 낮은 중합도(DP)를 갖는 것을 제외하고는, 그의 통상적인 대응물과 거의 구별할 수 없는 변형된 표백된 크래프트 섬유일 수 있다. 또한, 본 발명은 변형된 섬유를 제조하는 방법 및 그로부터 제조된 생성물을 제공한다. 상기 방법은 다단계 표백 공정의 단일 단계에 통합될 수 있는 1단계의 산성, 철 촉매화된 퍼옥사이드 처리 공정일 수 있다. 상기 생성물은 화학적 셀룰로즈 원료, 미세결정성 셀룰로즈 원료, 플러프 펄프 및 이들로부터 제조된 생성물일 수 있다.

Paper pulp bleaching method

FIELD: paper-making.SUBSTANCE: present invention relates to a method of bleaching unbleached or pre-bleached paper pulp, which includes at least the following sequential stages: a) obtaining unbleached or pre-bleached paper pulp with a pH value of at least 8, b) bringing the paper pulp obtained at the end of the stage a) into a contact with chlorine dioxide, c) adding at least one Bronsted base into the paper pulp if pH of the paper pulp obtained at the stage b) is less than 10, d) adding hydrogen peroxide into the paper pulp obtained at the end of the stage c), e) keeping the paper pulp obtained at the end of the stage d) in the first bleaching tower, f) not necessarily adding sulfuric acid into the paper pulp obtained at the end of the stage e) and keeping the obtained paper pulp in the second bleaching tower. The method does not require the stage of flushing the paper pulp before the end of the stage e) and, if applicable, before the end of the stage f).EFFECT: obtaining a paper pulp bleaching method.13 cl, 5 tbl, 2 ex, 6 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 747 664 C2 (51) МПК D21C 9/14 (2006.01) D21C 9/16 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК D21C 9/14 (2021.01); D21C 9/163 (2021.01) (21)(22) Заявка: 2019121768, 18.01.2018 (24) Дата начала отсчета срока действия патента: Дата регистрации: 11.05.2021 23.01.2017 FR 1750512 (43) Дата публикации заявки: 11.01.2021 Бюл. № 2 (45) Опубликовано: 11.05.2021 Бюл. № 14 (73) Патентообладатель(и): САНТР ТЕКНИК ДЕ Л'ИНДУСТРИ ДЕ ПАПЬЕ, КАРТОН И СЕЛЛЮЛОЗ (FR), ИНСТИТЮ ПОЛИТЕКНИК ДЕ ГРЕНОБЛЬ (FR) (56) Список документов, цитированных в отчете о поиске: WO 1991012366 A1, 22.08.1991. US 3884752 A1, 20.05.1975. EP 222674 A1, 20.05.1987. RU 2189412 C2, 20.09.2002. (85) Дата начала рассмотрения заявки PCT на национальной фазе: 11.07.2019 2 7 4 7 6 6 4 Приоритет(ы): (30) Конвенционный приоритет: R U 18.01.2018 (72) Автор(ы): МОРТХА, Жерар (FR), МАРКОН, ...

Modified cellulose from chemical kraft fiber and methods of making and using the same

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

Method of making a highly functional, low viscosity kraft fiber using an acidic bleaching sequence and a fiber made by the process

A pulp fiber with an enhanced carbonyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described.

Softwood kraft fiber having an improved α-cellulose content and its use in the production of chemical cellulose products

A bleached softwood kraft pulp fiber with high α-cellulose content and a low CED viscosity is provided, A surfactant treated fiber useful in the production of chemical derivatives is also described. Methods for making the kraft pulp fiber and products made from it are also described.

Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described.