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Preparation method of low-acrylonitrile 2-acrylamido-2-methylpropanesulfonate

A technology of methylpropanesulfonate and acrylamide, which is applied in the field of compound preparation, can solve the problem of how to prepare, low 2-acrylamido-2-methylpropanesulfonate, acrylonitrile, etc. problems, to achieve the effect of stability, low cost and easy operation

Active Publication Date: 2022-04-01
WEIFANG QUANXIN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the preparation process of the existing 2-acrylamido-2-methylpropanesulfonate product, the removal of acrylonitrile is not mentioned, nor how to prepare 2-acrylonitrile-2-acrylonitrile content Related reports about methyl propane sulfonate

Method used

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  • Preparation method of low-acrylonitrile 2-acrylamido-2-methylpropanesulfonate
  • Preparation method of low-acrylonitrile 2-acrylamido-2-methylpropanesulfonate

Examples

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Effect test

Embodiment 1

[0036]Add 543kg of 32% liquid caustic soda and 555kg of water into the 2000L reactor, turn it on to cool down, start to add 900kg of 2-acrylamido-2-methylpropanesulfonic acid powder, and after the addition is completed, add 1.34kg of sodium sulfite (sodium sulfite and The molar ratio of acrylonitrile is 2:1), add 0.14kg of polymerization inhibitor, control the temperature in the kettle to 35°C, after stirring for 2 hours, the pH becomes 12.60, then slowly add AMPS powder to adjust the pH, and the adding time is 10min, The dosage is 2.5kg, and the pH in the kettle is adjusted to 9.50.

[0037] After adding AMPS, adjust the pH value, continue stirring for 30 minutes, stop stirring, and maintain the temperature in the kettle at 20°C. During this period, the pH of the product is continuously checked until the pH value does not rise again, and the time is 1.5 hours. Start stirring again, add a little sulfuric acid to readjust the pH to 9.45, and discharge to obtain 2-acrylamido-2-m...

Embodiment 2

[0039] Add 543kg32% liquid caustic soda and 555kg water to the 2000L reactor, add 1.34kg sodium sulfite (the molar ratio of it to acrylonitrile in the product is 2:1), turn on the cooling, and start to add 2-acrylamido-2-methylpropane Sulfonic acid powder 900kg, after adding, add 0.14kg of polymerization inhibitor, control the temperature in the kettle to 30°C, stir for 2 hours, the pH becomes 12.20, then slowly add AMPS powder to adjust the pH, adding time 8min, dosage 2.4 kg, adjust the pH in the kettle to 9.80.

[0040] After adding AMPS, adjust the pH value, continue stirring for 30 minutes, stop stirring, and maintain the temperature in the kettle at 20°C. During this period, the pH of the product is continuously checked until the pH value does not rise again. The time is 1 hour, start stirring again, add a little sulfuric acid to readjust the pH to 9.45, and discharge to obtain 2-acrylamido-2-methylpropanesulfonate solution , after testing, the content of acrylonitrile ...

Embodiment 3

[0042] Add 543kg32% liquid caustic soda and 555kg water into the 2000L reactor, turn on the cooling, start to add 900kg of 2-acrylamido-2-methylpropanesulfonic acid powder, add about half of it, add 1kg of sodium sulfite (it is mixed with the product The mass ratio of acrylonitrile is 1.5:1), and continue to feed 2-acrylamido-2-methylpropanesulfonic acid powder. After feeding, add 0.14kg of polymerization inhibitor, control the temperature in the kettle to 35°C, and stir for 2h. The pH became 12.40, and then began to slowly add AMPS powder to adjust the pH. The addition time was 10 minutes, the dosage was 2.0kg, and the pH in the kettle was adjusted to 9.60.

[0043] After adding AMPS, adjust the pH value, continue stirring for 30 minutes, stop stirring, and keep the temperature at 20°C. During this period, the pH of the product is continuously checked until the pH value does not rise any more. The time is 1h20min. Then start stirring again, add a little hydrochloric acid to r...

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Abstract

The invention discloses a method for preparing low-acrylonitrile 2-acrylamido-2-methylpropanesulfonic acid salt, which uses 2-acrylamido-2-methylpropanesulfonic acid powder and alkaline substances as raw materials to prepare 2 ‑acrylamido‑2‑methylpropanesulfonic acid salt solution; determine the content of residual acrylonitrile in the 2‑acrylamido‑2‑methylpropanesulfonic acid powder raw material before feeding; add absorption to the reaction solution during the preparation process The molar ratio of the absorbent to the acrylonitrile in the 2-acrylamido-2-methylpropanesulfonic acid powder raw material added is 1.5-2:1; after the absorbent is added to the reaction liquid, it is carried out in two stages And reaction, make the 2-acrylamido-2-methyl propane sulfonate solution of low acrylonitrile content. The present invention innovatively proposes a preparation method of 2-acrylamido-2-methylpropanesulfonate with low acrylonitrile content for the first time, and the acrylonitrile content in the salt solution product prepared by this method is greatly reduced, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of compound preparation, and relates to the preparation of 2-acrylamido-2-methylpropanesulfonate, in particular to a preparation of 2-acrylamido-2-methylpropanesulfonate with low acrylonitrile content Preparation. Background technique [0002] 2-Acrylamido-2-methylpropanesulfonic acid, referred to as AMPS, is a multifunctional water-soluble anionic monomer, which is white crystalline powder. [0003] The structural formula of AMPS contains strong anionic, water-soluble, and salt-insensitive sulfonic acid groups, shielded amide groups and unsaturated double bonds, which make it have excellent performance. The special structure of AMPS can also be used to improve the comprehensive properties of water-insoluble polymers. Its polymers are excellent functional polymer electrolytes, as dye fixatives, flocculants, dispersants, thickeners, and have been widely used in chemical fiber, plastics, coatings, surfactant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/32C07C309/15
CPCC07C303/32C07C309/15
Inventor 蒋华锋李志军李远峰任吉林徐景明
Owner WEIFANG QUANXIN CHEM
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