Synthetic method of AMPS (2-Acrylamide-2-methylpropanesulfonic acid)

A methylpropanesulfonic acid and acrylamide-based technology, which is applied in the preparation of sulfonic acid and organic chemistry, can solve the problems of energy consumption and achieve the effects of reducing energy consumption and inhibiting side reactions

Inactive Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can meet the needs of industrial production, but still need to control the temperature in the vacuum distillation process, and it is necessary to add a polymerization inhibitor to avoid the polymerization of acrylonitrile in the distillation process, while consuming a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0023] In the four-necked flask that is provided with temperature control device, stirrer, thermometer and gas feeding device, add 135g commercially available analytical pure acrylonitrile (wherein the content of acrylonitrile is 99.7% by weight, the balance is water), the acrylonitrile Cool to 0°C, slowly add 1 mass% SO 3 31g of fuming sulfuric acid, and then adjust the temperature of the reaction system to 40°C, and slowly introduce 17g of isobutene to react. After the introduction of isobutene is completed, the reaction is terminated after keeping the temperature for one hour, and the reaction solution is vacuum filtered. After filtering, the filter cake and filtrate are obtained, the filtrate is recovered, and the filter cake is vacuum-dried at a drying temperature of 100° C. and a drying pressure of 10 KPa to obtain a dried filter cake.

[0024] The dried filter cake is the crude AMPS product, the LC purity is 95% by weight, and the calculated yield of AMPS is 90%.

Embodiment 1

[0026] In the four-necked flask that is provided with temperature control device, stirrer, thermometer and gas feeding device, add the acrylonitrile (wherein the content of acrylonitrile is 99.2% by weight) that reclaims in the reference example 1 of 135g, acrylonitrile is cooled to 0 °C, slowly add 1 wt% SO 331g of fuming sulfuric acid, and then adjust the temperature of the reaction system to 40°C, and pass 17g of isobutene to react. After the isobutene is passed through, the reaction is completed after 1 hour of heat preservation, and the reaction solution is vacuum filtered. After filtering, the filter cake and filtrate are obtained, the filtrate is recovered, and the filter cake is vacuum-dried at a drying temperature of 100° C. and a drying pressure of 10 KPa to obtain a dried filter cake.

[0027] The dried filter cake is the crude AMPS product, the LC purity is 95.4% by weight, and the calculated yield of AMPS is 93.5%.

Embodiment 2

[0029] In a four-necked flask provided with a temperature control device, a stirrer, a thermometer and a gas feed device, add 90 g of the acrylonitrile waste liquid recovered in Reference Example 1 (the content of acrylonitrile in the acrylonitrile waste liquid is 99.2% by weight) and 45g of commercially available analytically pure acrylonitrile, the acrylonitrile was cooled to 4°C, and slowly added 3 11.5g of oleum, and then adjust the temperature of the reaction system to 30°C, and slowly introduce 5.3g of isobutene to react. After the introduction of isobutene is completed, the reaction is terminated after 1 hour of heat preservation, and the reaction solution is filtered. The filtrate and filter cake were obtained after filtration, the filtrate was recovered, and the filter cake was vacuum-dried at a drying temperature of 80° C. and a drying pressure of 10 KPa to obtain a dried filter cake.

[0030] The dried filter cake is the crude AMPS product, the LC purity is 95.4% by...

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Abstract

The invention provides a synthetic method of AMPS (2-Acrylamide-2-methylpropanesulfonic acid), which comprises the following steps of: contacting acrylonitrile and sulfuric acid with isobutene to generate a pasty product; and separating the pasty product to obtain AMPS. The method is characterized in that: at least part of acrylonitrile is from waste liquid produced during the process in which acrylonitrile is taken as a raw material to synthesize AMPS. According to the synthetic method of AMPS, provided by the invention, acrylonitrile waste liquid with a certain proportion is directly taken as a reaction solvent and a reactant for synthesizing AMPS, so that the process of rectification recovery is reduced or completely given up, and the energy consumption is greatly reduced; and simultaneously, as the acrylonitrile waste liquid contains a reaction byproduct, in terms of chemical equilibrium, the side reaction can be prevented from occurring. Thus, compared with the prior art, the method provided by the invention can improve the yield of the product of AMPS.

Description

technical field [0001] The invention relates to a method for synthesizing 2-acrylamido-2-methylpropanesulfonic acid. Background technique [0002] 2-Acrylamide-2-methylpropanesulfonic acid (2-Acrylamide-2-methylpropanesulfonic acid, hereinafter referred to as AMPS) is a multifunctional water-soluble anionic monomer, due to its molecular structure has a carbon-carbon double bond and is insensitive to salt Sulfonic acid group, so it is easy to polymerize, and its homopolymer and copolymer have many special properties, which have broad application prospects and can be widely used in oilfield chemistry, water treatment agents, chemical fibers, plastics, printing and dyeing, coatings, surfactants, Antistatic agents, ceramics, photography, washing aids, ion exchange resins, gas separation membranes, electronics and other fields. [0003] The most typical process for producing AMPS at present is to prepare AMPS by reacting acrylonitrile, oleum and isobutylene under relatively mild...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/15C07C303/06
Inventor 李斗星黄凤兴齐兰芝穆晓蕾贾春革赵冬
Owner CHINA PETROLEUM & CHEM CORP
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