New Production methods of 3-mercaptopropionic acid 3-MPA CAS 107-96-0
3-Mercaptopropionic acid (short name 3-MPA, CAS Registration number 107-96-0) is an important chemical raw material and intermediate, which can be used in medicine, additives and catalysts. It is an intermediate of pharmaceutical fennerol (chlormethazone); it can be used as a stabilizing aid for polyvinyl chloride; it can be used as a curing agent in the field of coatings; it can be used to prepare polycarboxylic acid water-reducing agents. It is necessary to know that before you buy 3-Mercaptopropionic acid for use.
At present, the preparation process routes of 3-mercaptopropionic acid at home and abroad mainly include the following: acrylonitrile-sodium hydrosulfide or sodium thiosulfate method; acrylonitrile-thiourea method; acrylic acid-hydrogen sulfide method; 3-chloropropionic acid- Sodium thiosulfate method, etc. However, these methods usually have the following problems: the raw materials used are toxic or difficult to obtain. For example, acrylonitrile is highly toxic and 3-chloropropionic acid is difficult to obtain; the reaction requires high equipment, such as acrylic acid which is corrosive to high-pressure vessels; wastewater; Or the waste liquid is difficult to handle.
In order to solve the above technical problems, the purpose of the present invention is to provide a method for preparing 3-mercaptopropionic acid. In the preparation method provided by the present invention, sodium acrylate reacts with sodium hydrosulfide or sodium sulfide to generate sodium monothiopropionate, and then sodium sulfide (or sodium sulfide and sulfur powder) is added to crack sodium monothiopropionate to generate mercaptopropane Sodium and acid are added to obtain 3-mercaptopropionic acid. The preparation method provided by the invention has cheap raw materials, high yield of 3-mercaptopropionic acid, high purity of 3-mercaptopropionic acid, solid waste and solvent can be separated and recovered, sodium salt crystallized and used as industrial products, solvent distillation recovery recycling The three wastes are easy to use.
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