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Применить Всего найдено 7. Отображено 7.
23-05-2019 дата публикации

METHOD FOR PREPARING 2,2'-DIPYRIDINE AND DERIVATIVES THEREOF

Номер: WO2019095613A1
Автор: LUO, Chaoran, WANG, Wenkui, XUE, Yi, CHEN, Xinchun, ZHOU, Dianhai, JIANG, Jianhua, WANG, Fujun
Принадлежит:

Disclosed is a method for preparing 2,2'-dipyridine and derivatives thereof. The method comprises: using pyridine represented by formula I or a derivative thereof as a raw material to generate 2,2'-dipyridine represented by formula II by performing dehydrogenative coupling under the action of a supported catalyst in the presence of additives, wherein R is H, C1-C2 alkyl, Cl, or Br. The method of the present invention features wide adaptability to raw materials, high atomic utilization rate, high catalyst activity, long service life, and fewer by-products.

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Номер записи: 1
07-03-2019 дата публикации

METHOD FOR PREPARING 1,1'-ETHYLENE-2,2'-BIPYRIDYL DICHLORIDE SALT

Номер: WO2019041462A1
Автор: YUE, Ruikuan, XUE, Yi, CHEN, Honglong, WANG, Wenkui, LUO, Chaoran, CHEN, Xinchun, ZHOU, Dianhai, JIANG, Jianhua, WANG, Fujun
Принадлежит:

Disclosed is a method for preparing 1,1'-ethylene-2,2'-bipyridyl dichloride salt, the method involving mixing an aqueous solution of diquat dibromide with hydrochloric acid, and then dropwise adding same to a mixed solution of an organic solvent, a bromine absorbent and an oxidant for reaction to obtain the 1,1'-ethylene-2,2'-bipyridine dichloride salt.

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Номер записи: 2
14-05-2020 дата публикации

GREEN PREPARATION METHOD FOR DIQUAT ANION SALT

Номер: WO2020093459A1
Автор: XUE, Yi, YUE, Ruikuan, CHEN, Honglong, YUAN, Yi, WANG, Wenkui, LUO, Chaoran, LIU, Xiaopan, ZHOU, Yuming, WANG, Mingliang, SUN, Baiwang, BAO, Jiehua
Принадлежит:

The present invention relates to the field of chemistry, and disclosed thereby is a green preparation method for a diquat anion salt, the method comprising: reacting a diquat dibromide mother liquor with an oxidant in the presence of hydrochloric acid or sulfuric acid to obtain a reaction solution containing a diquat dichloride salt or diquat disulfate salt; filtering the reaction solution; adjusting the pH of the filtrate; concentrating to obtain a diquat dichloride mother liquor or diquat disulfate mother liquor; mixing a filter cake with an organic solvent; introducing ethylene to react until the system pressure no longer changes; filtering the reaction solution to obtain a filtrate containing 1,2-dibromoethane and a diquat dibromide salt solid; washing and drying the diquat dibromide salt to prepare a diquat dibromide mother liquor; recovering the filtrate to obtain 1,2-dibromoethane, and reacting same with bipyridine to produce a diquat dibromide salt. The method of the present invention ...

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Номер записи: 3
24-10-2019 дата публикации

CATALYST FOR PREPARING PYRIDINE BASE FROM SYNTHETIC GAS, PREPARATION METHOD THEREFOR AND USE THEREOF

Номер: WO2019200778A1
Автор: LIU, Xiaopan, LUO, Chaoran, XUE, Yi, WANG, Wenkui, DU, Xiang
Принадлежит:

Disclosed is a catalyst for preparing a pyridine base from synthetic gas, the catalyst comprising a carrier, an active component, a first auxiliary agent and a second auxiliary agent, wherein the carrier is a molecular sieve, the active component is Rh, the first auxiliary agent is one or more of Mn, Fe, Na and La, and the second auxiliary agent is one or more of Zn, Co, Cr, Bi and Cu; and Rh is 0.5-3% of the mass of the carrier, the first auxiliary agent is 0.05-5% of the mass of the carrier, and the second auxiliary agent is 0.5-15% of the mass of the carrier. The catalyst is applied to the preparation of a pyridine base by catalyzing synthetic gas, wherein the synthetic gas and an ammonia donor are used as reaction raw materials and reacted to obtain a pyridine base product. The catalyst can couple the cyclization and condensation reactions in which acetaldehyde and aldehyde ammonia are generated by the hydrogenation of carbon monoxide, and realize the conversion from synthetic gas to ...

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Номер записи: 4
07-07-2023 дата публикации

Piperidine dehydrogenation catalyst and preparation method thereof

Номер: CN116393159A
Автор: CHEN HONGLONG, LUO CHAORAN, WANG FUJUN, CHEN JIZHEN, DU XIANG, ZHANG WEIWEI
Принадлежит:

The present invention discloses a piperidine dehydrogenation catalyst and a preparation method thereof, and relates to the technical field of catalysts, the piperidine dehydrogenation catalyst comprises an active component and a carrier composition, the active component comprises a noble metal active component and a transition metal active component, and the active component accounts for 0.1-1% of the weight of the carrier composition in terms of elementary substance; the carrier composition comprises a molecular sieve and a modified metal oxide, the content of the molecular sieve in the carrier composition is 95%, and the content of the modified metal oxide in the carrier composition is 5%. According to the dehydrogenation catalyst disclosed by the invention, the active component and the carrier composition are matched, so that the reaction temperature can be reduced in actual use, the coking is reduced, the product yield is further improved, and the service life of the catalyst is prolonged ...

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Номер записи: 5
18-07-2023 дата публикации

Preparation process of 2, 2 '-dipyridyl

Номер: CN116444423A
Автор: ZHANG WEIWEI, LUO CHAORAN, CHEN HONGLONG, CHEN JIZHEN, WANG FUJUN, WANG WENKUI, DU XIANG, JIANG JIANHUA
Принадлежит:

The invention discloses a preparation process of 2, 2 '-dipyridyl, and relates to the technical field of dipyridine.The method comprises the steps that pyridine serves as a raw material, a fixed bed serves as a reactor, under the action of a loaded nickel catalyst, coupling reaction is conducted to generate 2, 2'-dipyridyl, the nickel content in the loaded nickel catalyst is 62-65%, and a carrier of the loaded nickel catalyst is modified silicon oxide; the specific preparation process comprises the following steps: S01, loading a nickel-loaded catalyst into a fixed bed reactor, activating for 2-3 hours, and heating to a reaction temperature; s02, pyridine and an additive are mixed according to a certain proportion, then the mixed solution is injected into the fixed bed reactor, and 2, 2 '-dipyridine.The activity of the loaded nickel catalyst is higher, and through the catalytic reaction of the loaded nickel catalyst, the prepared 2, 2'-dipyridineis high in conversion rate and long in service ...

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Номер записи: 6
25-07-2023 дата публикации

Preparation process of aquacide dichloride

Номер: CN116478159A
Автор: CHEN JIZHEN, DING YONGSHAN, YUE RUIKUAN, WANG WENKUI, CHEN HONGLONG, WANG FUJUN, ZHANG WEIWEI, LUO CHAORAN
Принадлежит:

The invention discloses a preparation process of diquat dichloride, and relates to the technical field of diquat, and the specific preparation process of the diquat dichloride comprises the following steps: S01, mixing diquat dibromide and hydrochloric acid, adding a catalyst, mixing, dropwise adding into a mixed solution of an organic solvent, a bromine absorbent and an oxidizing agent, keeping the temperature at 50 DEG C, reacting for 1-2 hours, filtering, washing, and drying to obtain the diquat dichloride. Controlling the dropping speed, and heating to 60-70 DEG C for reaction; s02, after the reaction is finished, liquid separation is performed to obtain a water phase and a reaction oil phase, residual bromide in the water phase is extracted with an organic solvent, an extraction water phase and an extraction oil phase are obtained, ammonium bicarbonate is added into the extraction water phase, the pH of the extraction water phase is adjusted to 5-6, and after concentration, diquat ...

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Номер записи: 7