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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

Inactive Publication Date: 2006-06-28
顾建荣
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In this method, because thiourea is relatively expensive, the yield is low, and the cost is relatively high, so that the product is difficult to market

Method used

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  • Process for preparing 3-mercaptopropyl acid
  • Process for preparing 3-mercaptopropyl acid
  • Process for preparing 3-mercaptopropyl acid

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Experimental program
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Effect test

Embodiment Construction

[0026] The present invention will be further described below in conjunction with embodiment, but does not limit the present invention.

[0027] Preparation of synthetic solution:

[0028] 250 grams of 30% sodium hydrosulfide, 12 grams of caustic soda, 20 grams of water, and 3 grams of catalyst sodium disulfide were added to the reaction pot and stirred, and 54 grams of acrylonitrile was added at 25°C for reaction, and the reaction was carried out for 10 hours after adding.

[0029] acidification:

[0030] Adding concentration is 450 grams of industrial hydrochloric acid of 30% to above-mentioned synthesis liquid, heats up and refluxes for 3 hours.

[0031] reduction:

[0032] The temperature of the above acidified solution was lowered to 30°C, 40 grams of zinc powder was added to react, and the temperature was raised to 100°C for 0.5 hours.

[0033] Extraction, Distillation:

[0034] Add 500 g of toluene to the above reducing solution, stir and separate layers, distill the...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C319/04C07C323/52
Inventor 顾建荣
Owner 顾建荣
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