Process for reducing sulfate ions in synthesis process of 2-acrylamido-2-methylpropanesulfonic acid

A technology of methyl propanesulfonic acid and acrylamide group, which is applied in the chemical field to achieve the effects of low cost, high purity and low sulfate radical residues

Active Publication Date: 2017-09-05
WEIFANG QUANXIN CHEM
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  • Summary
  • 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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  • Process for reducing sulfate ions in synthesis process of 2-acrylamido-2-methylpropanesulfonic acid

Examples

Experimental program
Comparison scheme
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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PUM

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Abstract

The invention discloses a process for reducing sulfate ions in the synthesis process of 2-acrylamido-2-methylpropanesulfonic acid. The process comprises the following steps: (1) firstly, adding certain parts of acrylonitrile and a dehydrant into a reaction kettle, and supplying cooling water to cool to minus 30 DEG C to 0 DEG C; (2) introducing gasified isobutene into the reaction kettle at minus 30 DEG C to 0 DEG C, introducing a certain amount of the component, and continuously introducing isobutene and dropping fuming sulfuric acid at the same time; (3) after the fuming sulfuric acid is completely added, continuously introducing a certain amount of an isobutene gas; (4) after the material is completely added, performing heat-preservation reaction at 10-40 DEG C; and (5) performing cooling crystallization on a generated paste product, and performing separation drying, thereby obtaining a 2-acrylamido-2-methylpropanesulfonic acid synthesized product. The synthesized product disclosed by the invention is high in purity, low in cost, convenient in industrial production and relatively low in sulfate radical residue 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 Applications(China)
IPC IPC(8): C07C303/02C07C309/15
CPCC07C303/02C07C309/15
Inventor 林普文李志军蒋华锋
Owner WEIFANG QUANXIN CHEM
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