15667-63-7Relevant articles and documents
Preparation method and device of 1-cyano-2-propenyl acetate
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Paragraph 0035-0057, (2020/05/14)
The invention provides a preparation method of 1-cyano-2-allyl acetate. The preparation method comprises an esterification reaction and distillation. Acrolein cyanohydrin and liquid acetic anhydride are subjected to the esterification reaction in the presence of a catalyst and inorganic acid to prepare a reaction solution containing ACA, an ACA product is obtained after distillation, and the esterification reaction further comprises the step of introducing gaseous acetic anhydride into a reaction system. The invention further provides a preparation device of 1-cyano-2-allyl acetate. Accordingto the method and the device, acetic anhydride is ingeniously divided into two parts to be fed, one part is separated out to serve as acetic anhydride steam which is fed into an esterification reaction tower from the bottom of the tower, heat required by reaction can be provided, acetic acid can be effectively blown off, the esterification reaction can be accelerated through effective removal of acetic acid, and the reaction efficiency is improved. The device is characterized in that a conductivity meter is arranged in the esterification reaction tower to monitor the reaction process on line,so that the timeliness and effectiveness of reaction process control are guaranteed.
Method for synthesizing 2-acetoxyl-3-crotononitrile
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Paragraph 0023; 0024, (2018/05/01)
The invention discloses a method for synthesizing 2-acetoxyl-3-crotononitrile. The method comprises the following steps: taking acrolein, hydrocyanic acid and acetic anhydride as raw materials, dropping mixed solution of the acrolein and the acetic anhydride into alcoholic solution of the hydrocyanic acid, performing a reaction on the mixture, so as to obtain the 2-acetoxyl-3-crotononitrile. In the method, the hydrocyanic acid replaces sodium cyanide which is used for performing a reaction with water, so that the problem that cyanide-containing waste water caused by the use of the water in thesynthesis process is avoided, and the 2-acetoxyl-3-crotononitrile is efficiently synthesized. In the method, alcohol is taken as a reaction system, acetic acid is generated in the reaction process, and all solvents can be recycled, therefore, the method has the advantages of being environmentally friendly and lowering the cost.
Process for the preparation of 2-hydroxy-4-(methylthio) butanoic acid or methionine by mercaptan addition
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, (2008/06/13)
A process for the free-radical addition of a mercaptan to a nonconjugated olefinic substrate having a terminal carbon-carbon double bond is disclosed. 2-Hydroxy-4-(ethylthio)butanoic acid (HMBA) or methionine can be prepared using this method. The nonconjugated olefinic substrate has the general formula: STR1 wherein R is selected from the group consisting of --COOH, --COOR2, --CONR3 R4, --CN and --CCl3, R1 is selected from the group consisting of --OH, --OCOR2, --NHCOR2 and --NH2, R2 is selected from the group consisting of alkyl, cycloalkyl and aryl and R3 and R4 are independently selected from the group consisting of --H and R2.