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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 6. Отображено 6.
28-11-2019 дата публикации

METHOD FOR SYNTHESIZING SUCROSE-6-ESTER

Номер: WO2019223485A1
Автор: ZHOU, Yougui, CAI, Jiang, MA, Kaifeng, WANG, Yugang, WEI, Xiaoqiao, YANG, Yunhan
Принадлежит:

A method for synthesizing sucrose-6-ester. The method comprises: (a) in the presence of a polar aprotic solvent, contacting an organic phosphine compound represented by formula I with sucrose and an organic tin compound; (b) removing water to obtain a reaction liquid containing a tin-sucrose adduct; and (c) contacting the reaction liquid containing the tin-sucrose adduct with an acid anhydride compound to prepare sucrose-6-ester. (Formula I). R1, R2, and R3 in formula I each are linear or branched alkyl containing 1-20 carbon atoms, cycloalkyl containing 3-10 carbon atoms, or aryl containing 6-10 carbon atoms; moreover, the R1, R2, and R3 are identical groups, partially identical groups, or different groups. According to the method, the reaction conversion efficiency and selectivity are greatly improved, and the molar yield of sucrose-6-ester can reach more than 92% and even can reach 95.3%; moreover, it is easy to implement industrial application.

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Номер записи: 1
22-08-2023 дата публикации

Preparation method of 4-oxoisophorone

Номер: CN116621682A
Автор: ZHANG QIAN, QIAO SHENGCHAO, MA LI, ZHENG SIMIN, WANG YUGANG, GAO FENG, YANG PENGKAI, LIANG SHAOPING
Принадлежит:

The invention discloses a preparation method of 4-oxoisophorone, which comprises the following steps: oxidizing beta-isophorone to prepare the 4-oxoisophorone; the reaction phase chamber is used for accommodating a reaction system, the gas phase chamber is used for caching mixed gas and is communicated with the reaction phase chamber, the connecting channel is used for connecting the lower part of the reaction phase chamber and the gas phase chamber, and the gas phase chamber, the connecting channel and the reaction phase chamber form a gas circulating channel; the reaction system comprises organic alkali, a catalytic system and beta-isophorone, the catalytic system comprises copper ions, acid and water, and the mixed gas comprises oxygen; in the oxidation process, the mixed gas enters the reaction system from the lower part of the reaction phase chamber through the connecting channel, part or all of the oxygen participates in the reaction, the gas which does not participate in the reaction ...

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Номер записи: 2
04-08-2023 дата публикации

Preparation process of vitamin E acetate

Номер: CN116535377A
Автор: GAO FENG, NIU GUANGWEN, QIAO SHENGCHAO, WANG YUGANG, FAN JINHAO, JIANG LIN, YANG PENGKAI, LIANG SHAOPING
Принадлежит:

The invention belongs to the technical field of chemical synthesis, and discloses a preparation process of vitamin E acetate, which comprises the following steps: by taking modified resin as a catalyst, 2, 3, 5-trimethylhydroquinone diester as a solute and acetic acid as a solvent, simultaneously pumping an acetic acid solution of the 2, 3, 5-trimethylhydroquinone diester and isophytol into a microchannel reactor for transesterification to obtain the vitamin E acetate, the catalyst is resin loaded with proton strong acid and lewis acid, and the catalyst is loaded in the microchannel reactor. The micro-channel reactor is beneficial to improving the reaction mass transfer effect, and the supported modified macromolecular catalyst is beneficial to increasing the contact area of reaction liquid and the catalyst, so that the reaction rate is increased, the reaction time is shortened, and the reaction yield is increased; meanwhile, by using the modified resin catalyst, the post-treatment process ...

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Номер записи: 3
18-07-2023 дата публикации

Method for recovering low-concentration rhodium catalyst from organic leftovers containing rhodium catalyst

Номер: CN116445724A
Автор: GAO FENG, NIU GUANGWEN, QIAO SHENGCHAO, WANG YUGANG, FAN JINHAO, LIU XIAOTONG, JIANG LIN, YANG PENGKAI, LIANG SHAOPING
Принадлежит:

The invention relates to the technical field of catalyst recovery, and discloses a method for recovering a low-concentration rhodium catalyst from rhodium catalyst-containing organic leftover materials, which comprises the following steps: (1) adding a modified thermo-sensitive polymer aqueous solution into an isovaleraldehyde application mother solution, stirring, and standing for layering; and (2) heating the water phase obtained after separation, performing phase change on the polymer adsorbed with rhodium to separate out, filtering, and roasting to obtain the recycled rhodium catalyst. The method provided by the invention realizes recovery of the low-concentration rhodium catalyst in the rhodium catalyst-containing organic leftovers, has the advantages of high recovery rate, energy conservation, environmental protection and mild process conditions, and can effectively expand the application range of the rhodium catalyst.

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Номер записи: 4
01-08-2023 дата публикации

Production method and production system of beta-isophorone

Номер: CN116514643A
Автор: ZHANG QIAN, QIAO SHENGCHAO, ZHOU YINJUAN, WANG YUGANG, GAO FENG, YANG PENGKAI, LIANG SHAOPING
Принадлежит:

The invention relates to a production method and a production system of beta-isophorone, alpha-isophorone is used as an initial raw material to prepare beta-isophorone, and the adopted production system comprises a heater for heating and vaporizing alpha-isophorone, a gas-liquid separator, a packed column filled with a catalyst and a rectifying tower which are arranged in sequence; the production method comprises the steps that alpha-isophorone is heated and vaporized through the heater and then enters the gas-liquid separator to be subjected to gas-liquid separation, a gas material is obtained, the gas material enters the packed column to be catalyzed through the catalyst and then enters the rectifying tower to be separated, and beta-isophorone is obtained. The liquid-solid phase reaction is converted into the gas-solid phase reaction, so that the loss of the catalyst is greatly reduced, the catalyst is prevented from accumulating in the liquid phase and causing side reaction, and the ...

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Номер записи: 5
28-07-2023 дата публикации

Preparation method of palladium-based homogeneous catalyst and application of palladium-based homogeneous catalyst in synthesis of isophytol

Номер: CN116496494A
Автор: NIU GUANGWEN, JIANG LIN, GAO FENG, QIAO SHENGCHAO, WANG YUGANG, FAN JINHAO, YANG PENGKAI, LIANG SHAOPING
Принадлежит:

The invention relates to the technical field of chemistry, and discloses a preparation method of a palladium homogeneous catalyst, the catalyst is prepared by using PEG modified PAMAM dendrimer PAMAM-PEG as a ligand and palladium as an active component through a complexation reaction, the catalyst is easily dissolved in ethanol, the selectivity is good, the active component is not easy to fall off, and the activity is high; the invention also provides an application of the palladium-based homogeneous catalyst in synthesis of isophytol, so that recycling of the catalyst is realized, the catalyst cost is saved, sufficient hydrogenation of dehydroisophytol is realized, and the leftover rate of a system and the content of perhydroisophytol are effectively reduced.

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Номер записи: 6