Method for producing thiodipropionic acid by bipolar membrane electrodialysis

A technology of bipolar membrane electrodialysis and thiodipropionic acid, applied in chemical instruments and methods, membrane technology, sulfide preparation, etc., can solve problems such as serious odor, hydrogen sulfide procurement, transportation, and use problems, and achieve The effect of improving the working environment

Inactive Publication Date: 2017-11-24
天津力生化工有限公司
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Problems solved by technology

The disadvantage is that the odor produced by methyl acrylate and hydrogen sulfide is relatively serious during the production process, and there are problems in the procurement, transportation and use of hydrogen sulfide

Method used

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  • Method for producing thiodipropionic acid by bipolar membrane electrodialysis

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Embodiment 1

[0028] Add sodium sulfide aqueous solution into the reaction kettle, add acrylic acid dropwise according to the ratio of sodium sulfide:acrylic acid molar ratio of 1:2.1, the reaction temperature is 70-80°C, react for 2 hours, and the crude product yield of thiodipropionic acid is 90%. , to obtain the thiodipropionic acid condensation feed liquid, the condensation feed liquid is sent to the high-speed centrifugal sedimentation unit to remove the polymer and mechanical impurities through the delivery pump, and then the sodium polyacrylate is further removed through precision filtration and ultrafiltration, and the chelating resin processing unit Remove high-valent metal ions, pass the condensation feed solution after removing impurities into the salt chamber of the bipolar membrane electrodialysis device; ~0.5%) to ensure the passage of direct current and keep the temperature in the salt chamber and alkali chamber ≤35°C. Connect the anode and cathode respectively to the "+" and...

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Abstract

A method for producing thiodipropionic acid by bipolar membrane electrodialysis is characterized in that sodium sulfide and acrylic acid are used as raw materials and undergo a condensation reaction, and sodium polyacrylate and solid particles are removed from a feed liquid (a main component is sodium thiodipropionate) obtained after completion of the condensation reaction by a high-speed centrifugal sedimentation technology; a condensed feed liquid obtained after visible impurities are removed passes through a filter unit and then passes through a salt chamber of a bipolar membrane electrodialysis device composed of a bipolar membrane and a cationic membrane; a low-concentration sodium hydroxide solution is introduced into an alkali chamber of the bipolar membrane electrodialysis device to guarantee passing of direct current, temperature in the salt chamber and the alkali chamber is maintained to be less than or equal to 35 DEG C, and the positive pole and the negative pole are respectively accessed to ''+'' and ''-'' direct current for electrodialysis; and with electrodialysis, pH value of the condensed feed liquid is gradually transitioned to 2-3, thiodipropionic acid is moved out of the salt chamber, thiodipropionic acid is refined and dried to obtain a product, and about 6% caustic soda aqueous solution is obtained in the alkali chamber.

Description

technical field [0001] The invention relates to the field of synthetic technology of chemical raw materials, in particular to a synthesis method of thiodipropionic acid, in particular to a method for producing thiodipropionic acid by bipolar membrane electrodialysis. Background technique [0002] Thiodipropionic acid is the main raw material for the synthesis of thioester antioxidants. At present, the production process of thiodipropionic acid is as follows: Acrylic acid and sodium sulfide react to obtain sodium thiodipropionate, thiodipropionic acid Sodium is acidified with sulfuric acid to obtain crude thiodipropionic acid, and finally, through chemical unit operations such as crystallization, washing, and drying, to obtain thiodipropionic acid. In this process, many chemical unit operations such as crystallization and leaching produce a large amount of high-salt and high-COD wastewater. The waste water is treated by multi-effect evaporation or MVR, which has high energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44C07C319/20C07C323/52
CPCB01D61/445C07C319/20C07C323/52
Inventor 王秀林田洪祥张洪江张学平袁勇
Owner 天津力生化工有限公司
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