Process for preparing 3-mercaptopropyl acid

A technology of mercaptopropionic acid and hydrochloric acid, which is applied in the field of preparation of 3-mercaptopropionic acid, can solve the problems of difficult marketization of products, high cost, low yield, etc., and achieves low production cost, convenient wastewater treatment, and low price. Effect
CN1793117AInactive Publication Date: 2006-06-28顾建荣
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
顾建荣
Publication Date
2006-06-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a manufacture method for 3-thiohydracrylic acid. The feature is that is mixing the NaOH water solution, sodium hydrosulphide, sodium polysulfide, dropping acrylonitrile at 20-70 degree centigrade, keeping temperature to form kinds of inter mixture liquid, adding HCl to acidify, adding zinc powder to deoxidize to gain 3-thiohydracrylic acid solution. The invention could decrease cost, and the waste liquid is easy to process.
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Description

technical field

[0001] The invention relates to a preparation method of 3-mercaptopropionic acid. Background technique

[0002] In the prior art, 3-mercaptopropionic acid is an intermediate for the preparation of medicine fenarol, and can also be used in biochemical research, antioxidants, plastic additives, etc. Its structural formula is: SHCH2CH2COOH

[0003] The existing technology adopts the following steps to implement:

[0004]

[0005]

[0006] <chemistry num="001"> <chem file="200510022566_cml001.xml" / > < / chemistry>

[0007] After mixing thiourea and hydrochloric acid, add dropwise acrylonitrile to react, then add 4% caustic soda to remove ammonia gas. After the solution is neutralized to acidity with hydrochloric acid, it is extracted with a solvent, the solvent is recovered, and the finished product is obtained by distillation under reduced pressure. In this method, because thiourea is relatively expensive, th...

Claims

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