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Prepn process of 2-mercapto propanoic acid

A technology of mercaptopropionic acid and sodium mercaptopropionate, which is applied in the preparation of mercaptans, organic chemistry, etc., can solve the problems of high cost, low yield, difficult marketization of products, etc., and achieves increased yield, reduced production cost, Inexpensive effect

Inactive Publication Date: 2007-03-21
顾建荣
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  • Claims
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Problems solved by technology

[0008] The yield of the 2-chloropropionic acid-sodium hydrosulfide method is low, the cost is high, and the reaction has side reaction poisonous gas, so it is difficult to market the product

Method used

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  • Prepn process of 2-mercapto propanoic acid
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  • Prepn process of 2-mercapto propanoic acid

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with embodiment, but does not limit the present invention. Specifically include the following steps:

[0026] (1), the preparation of mixed solution:

[0027] First, add 116 grams of sodium carbonate to 400 grams of water to dissolve, slowly add 224 grams of 2-chloropropionic acid to react to obtain a 2-chloropropionic acid sodium reaction solution, and the pH value of the reaction solution is 7.0-7.5;

[0028] Then, 600 grams of sodium thiosulfate are added and dissolved in 400 grams of water to make an aqueous solution of sodium thiosulfate;

[0029] Then, add the sodium thiosulfate aqueous solution to the 2-chloropropionate sodium reaction liquid at 70-75°C after 1 hour to react to generate 2-thiopropionate sodium and 2-mercaptopropionic acid, 2-mercaptopropionic acid Sodium, sodium dithiodipropionate, dithiodipropionic acid mixture.

[0030] Finally, the reaction mixture was kept at 70° C. for 4...

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Abstract

The preparation process of 2-mercapto propanoic acid includes the following steps: mixing water solution of 2-chloropropionic acid and water solution of sodium carbonate to obtain sodium 2-chloropropionate in the reacted liquid; adding sodium thiosulfate into the reacted liquid to form mixture solution of sodium 2-thiopropionate, sodium 2-mercapto propanoic acid, sodium 2-mercapto propionate, sodium 2-thiodipropionate and 2-thiodipropionic acid; adding acid into the mixture solution to acidify to obtain mixture solution with 2-thiodipropionic acid and other acids; and finally adding zinc powder into the mixture solution to reduce 2-thiodipropionic acid into 2-mercapto propanoic acid in solution. The process has cheap material, low production cost, complete utilization of the material and high yield of 2-mercapto propanoic acid.

Description

technical field [0001] The invention relates to a preparation method of 2-mercaptopropionic acid. Background technique [0002] 2-Mercaptopropionic acid is an important flavor, and it can also be used as an intermediate in the synthesis of other flavors. It can be used in biochemical research, plastic additives, etc. Its structure is as follows: [0003] [0004] Adopt 2-chloropropionic acid-sodium hydrosulfide method in the prior art, relevant reaction formula is as follows: [0005] [0006] Follow the steps below to implement: [0007] Mix sodium hydrosulfide and 2-chloropropionic acid at 10°C according to a certain ratio, and then slowly heat up to 20°C after 1 hour, then rise to 35°C after 1 hour, and keep warm at this temperature until The reaction is complete. Add acid to the above reaction solution to adjust it to PH=1.0, then extract it with solvents such as ether, toluene or benzene, remove the solvent from the extract, and conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/52C07C319/06
Inventor 顾建荣
Owner 顾建荣
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