CAS: 14293-73-3; Potassium Dithionite

专利信息

专利号:US-11040938-B2
优先权日:2016-07-27
标 题 :Continuous flow process for the synthesis of phenylhydrazine salts and substituted phenylhydrazine salts
发明人：MA BING; PAN SHUAI
权利人:SHANGHAI HYBRID—CHEM TECH; SHANGHAI HYBRID CHEM TECH
摘要:The present invention provided a continuous flow process for the synthesis of phenylhydrazine salts and substituted phenylhydrazine salts. Diazotization, reduction, acidic hydrolysis and salifying with acids are innovatively integrated together. Using acidic liquids of aniline or substituted aniline, diazotization reagents, reductants and acids as raw materials, phenylhydrazine derivative salts is obtained through the synthesis process, which is a three-step continuous tandem reaction including diazotization, reduction, acidic hydrolysis and salifying. The described synthesis process is a kind of integrated solutions, which is carried out in an integrated reactor. The feed inlets of the integrated reactor are continuously filled with raw materials. In the integrated reactor, diazotization, reduction, acidic hydrolysis and salifying are carried out continuously and orderly, and phenylhydrazine salts or substituted phenylhydrazine salts is obtained in the outlet of the integrated reactor without interruption. The total reaction time is no more than 20 min.

专利号:US-3583979-A
优先权日:1969-05-06
标 题:Process for preparing n-aminohexamethyleneimine
发明人：LORENTZ WILLIAM D; BEAL PHILIP F; PARIKH JEKISHAN R
权利人:UPJOHN CO
摘要:THIS INVENTION RELATES TO A NOVEL PROCESS FOR THE PREPARATION OF N-AMINOHEXAMETHYLENEIMINE OF THE FORMULA 1-NH2-HEXAHYDROAZEPINE WHICH COMPRISES HEATING N-NITROSOHEXAMETHYLENEIMINE OF THE FORMULA 1-(O=N-)-HEXAHYDROAZEPINE IN A LOWER-ALKANOL-WATER CONTAINING A BASE AND AN ALKALI METAL HYDROSULFITE. N-AMINOHEXAMETHYLENEIMINE (I) IS A MAJOR REACTANT IN THE SYNTHESIS OF 1-(HEXAHYDRO-1HAZEPIN - 1 - YL) - 3 - (P-TOLYSULFONYL) UREA, THE ORAL ANTIDIABETIC DRUG TOLAZAMIDE.

专利号:US-2019152896-A1
优先权日:2016-07-27
标题 :Continuous Flow Process For the Synthesis of Phenylhydrazine Salts and Substituted Phenylhydrazine Salts

专利号:SE-438855-B
优先权日:1974-02-26
标 题:3-HYDROXICROTONIC ACID DERIVATIVES FOR USE AS INTERMEDIATE IN THE SYNTHESIS OF 3-CEFEM SUBSTANCES

专利号:SE-438854-B
优先权日:1974-02-26
标 题:3-METHYLENOIC ACID DERIVATIVES FOR USE AS INTERMEDIATE IN THE SYNTHESIS OF 3-CEFEM SUBSTANCES

专利号:CN-107663161-B
优先权日:2016-07-27
标题:A kind of continuous flow synthesis process of phenylhydrazine salt and substituted phenylhydrazine salt