A kind of technique of reducing sulfate ion in the synthesis process of 2-acrylamido-2-methylpropanesulfonic acid

A methylpropanesulfonic acid and acrylamide-based technology is applied in the chemical industry to achieve the effects of high purity, low sulfate radical residue and low cost

Active Publication Date: 2022-02-18
WEIFANG QUANXIN CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of sulfate ion in most of the synthesized 2-acrylamido-2-methylpropanesulfonic acid is more than 0.3%, how to realize the control of the sulfate content in the product during the synthesis process, and reduce the sulfate ion without refining content, but there is no mention in the prior art

Method used

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  • A kind of technique of reducing sulfate ion in the synthesis process of 2-acrylamido-2-methylpropanesulfonic acid

Examples

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Effect test

Embodiment 1

[0034] Put 200kg of 0.12% acrylonitrile with water content and 1.2kg of acetic anhydride in a 0.5 cubic meter stainless steel reactor equipped with a jacket constant temperature device, agitator, thermometer, and liquid and gas feed distributor, and cool down to -15°C with refrigerated liquid While stirring, start to feed isobutene at a constant speed. When about 1.2kg of isobutene was introduced into the reactor, 40 kg of fuming sulfuric acid with a sulfur trioxide concentration of 0.42% prepared in advance was added dropwise. , and then feed 1.2kg of isobutene, and the total amount of isobutene fed is 24kg. The reaction process temperature was controlled at 35°C by passing cold water through the jacket. After 1.5 hours of heat preservation, the reaction was terminated, and the reaction solution was vacuum filtered. After filtering, a filter cake and a filtrate are obtained, the filtrate is recovered, and the filter cake is vacuum-dried at a drying temperature of 70° C. to ...

Embodiment 2

[0037] Put 200kg of 0.15% acrylonitrile with water content and 1.3kg of acetic anhydride in a 0.5 cubic meter stainless steel reactor equipped with jacket constant temperature device, agitator, thermometer and liquid and gas feed distributor, and cool down to -10°C with refrigerated liquid While stirring, start to feed isobutene at a constant speed. When about 1.5 kg of isobutene was passed into, 40 kg of fuming sulfuric acid with a sulfur trioxide concentration of 0.63% prepared in advance was added dropwise. While sulfuric acid was added dropwise, isobutene was continuously passed into the reactor. When the oleum was added dropwise, 2.0 kg of isobutene was fed in again, and the total amount of isobutene fed was 24 kg. The reaction process temperature was controlled at 40°C by passing cold water through the jacket. After 1.5 hours of heat preservation, the reaction was terminated, and the reaction solution was vacuum filtered. After filtering, a filter cake and a filtrate a...

Embodiment 3

[0040] Put 135kg of 0.2% acrylonitrile with water content and 1.3kg of acetic anhydride in a 0.5 cubic meter stainless steel reactor equipped with a jacket constant temperature device, agitator, thermometer, and liquid and gas feed distributors, and cool down to -5°C with refrigerated liquid While stirring, start to feed isobutene at a constant speed. When about 1.36 kg of isobutene was passed into, 31 kg of fuming sulfuric acid with a sulfur trioxide concentration of 0.5% prepared in advance was added dropwise. When sulfuric acid was added dropwise, isobutene was continuously passed into the reactor. When the oleum was added dropwise, 1.19kg of isobutylene was fed. The total isobutene feed was 17 kg. The reaction process temperature was controlled at 40°C by passing cold water through the jacket. After 1.5 hours of heat preservation, the reaction was terminated, and the reaction solution was vacuum filtered. After filtering, a filter cake and a filtrate are obtained, the f...

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Abstract

A kind of technology that reduces sulfate ion in the synthesis process of 2-acrylamido-2-methyl propane sulfonic acid, comprises the steps: (1) earlier acrylonitrile and dehydrating agent of certain weight portion are added in reactor, open cooling Cool the water to -30°C ~ 0°C, (2) put the vaporized isobutene into the reaction kettle at the temperature of -30°C ~ 0°C; Fuming sulfuric acid; (3) After adding fuming sulfuric acid, continue to pass a certain amount of isobutene gas; (4) After the addition is completed, keep warm at a temperature of 10-40°C for reaction; (5) Mix the slurry generated by the above steps The crystallized product was cooled and crystallized, and the synthetic product of 2-acrylamido-2-methylpropanesulfonic acid was obtained after separation and drying. The synthesized product of the invention has high purity and low cost, is convenient for realizing industrialized production, and has relatively low residue of sulfate group without refining.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a process for reducing sulfate ions in the synthesis process of 2-acrylamide-2-methylpropanesulfonic acid. Background technique [0002] 2-Acrylamide-2-methylpropanesulfonic acid (2-Acrylamide-2-methylpropanesulfonic acid referred to as AMPS) is a multifunctional water-soluble anionic monomer, which is a white crystalline solid, and its structural formula is as follows: [0003] [0004] Due to the strong anionic, water-soluble, and salt-insensitive sulfonic acid groups, shielded amide groups and unsaturated double bonds in the AMPS structural formula, it has 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, co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/02C07C309/15
CPCC07C303/02
Inventor 林普文李志军蒋华锋
Owner WEIFANG QUANXIN CHEM
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