Method for continuous production of 2-acryloylamino-2-methyl propanesulfonic acid

A methylpropanesulfonic acid and acrylamide-based technology, which is applied in the preparation of sulfonic acid and organic chemistry, can solve the problems that the product quality does not meet the high-purity requirements of polymerization, shorten the reaction cycle, scientifically design the process flow, and improve quality The effect of stability

Active Publication Date: 2014-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN102351744 divides isobutylene into two times and mixes with acrylonitrile and oleum on this basis, further improves the conversion rate of reaction, but there are certain limitations in the design of its process, the quality of the synthesized product has not reached the level suitable for polymerization high purity requirement

Method used

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  • Method for continuous production of 2-acryloylamino-2-methyl propanesulfonic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Preparation of 2-acrylamido-2-methylpropanesulfonic acid

[0021] Add acrylonitrile and sulfur trioxide to a glass container with a stirring device at a flow rate of 200g / h and 25g / h respectively by a metering pump for mixing. The glass container is cooled by an outer jacket, and the internal temperature is controlled at 6°C . Along with the mixing of acrylonitrile and sulfur trioxide, the mixed solution continuously flows into the primary reactor with stirring device through the overflow port in the middle of the glass container. At the same time, isobutene was vaporized and fed into the primary reactor at a feed rate of 17.5 g / h, and the temperature in the primary reactor was controlled at 30° C. with a water bath. The reaction liquid flows into the secondary reactor through the overflow port in the middle of the primary reactor. At the same time, the vaporized isobutene and sulfur trioxide were fed into the secondary reactor at a feed rate of 17.5 g / h and 25 g / h...

Embodiment 2

[0027] 1) Preparation of 2-acrylamido-2-methylpropanesulfonic acid

[0028]Add acrylonitrile and sulfur trioxide into a glass container with a stirring device at a flow rate of 225g / h and 30g / h respectively by a metering pump for mixing. The glass container is cooled by an outer jacket, and the internal temperature is controlled at 8°C . Along with the mixing of acrylonitrile and sulfur trioxide, the mixed solution continuously flows into the primary reactor with stirring device through the overflow port in the middle of the glass vessel. At the same time, isobutene was vaporized and fed into the primary reactor at a feed rate of 22.6 g / h, and the temperature in the primary reactor was controlled at 35° C. with a water bath. The reaction liquid flows into the secondary reactor through the overflow port in the middle of the primary reactor. At the same time, the vaporized isobutene and sulfur trioxide were fed into the secondary reactor at feed rates of 17.4 g / h and 20 g / h re...

Embodiment 3

[0034] 1) Preparation of 2-acrylamido-2-methylpropanesulfonic acid

[0035] Add acrylonitrile and sulfur trioxide into a glass container with a stirring device at a flow rate of 275g / h and 25g / h respectively by a metering pump for mixing. The glass container is cooled by an outer jacket, and the internal temperature is controlled at 10°C . Along with the mixing of acrylonitrile and sulfur trioxide, the mixed solution continuously flows into the primary reactor with stirring device through the overflow port in the middle of the glass vessel. At the same time, isobutene was vaporized and fed into the primary reactor at a feed rate of 22 g / h, and the temperature in the primary reactor was controlled at 40° C. with a water bath. The reaction liquid flows into the secondary reactor through the overflow port in the middle of the primary reactor. At the same time, the vaporized isobutene and sulfur trioxide were fed into the secondary reactor at a feed rate of 12.9 g / h and 25 g / h r...

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Abstract

The invention provides a method for continuous production of 2-acryloylamino-2-methyl propanesulfonic acid. The method comprises the steps: acrylonitrile and sulfur trioxide are continuously mixed, the mixed liquid flows into a first-level reactor and is subjected to a first-level reaction with isobutene simultaneously introduced into the first-level reactor, the reaction liquid of the first-level reactor enters a second-level reactor and is subjected to a second-level reaction with isobutene and sulfur trioxide simultaneously introduced into the second-level reactor, then the reaction liquid of the second-level reactor is subjected to solid-liquid separation, and the obtained solid is dried to obtain the 2-acryloylamino-2-methyl propanesulfonic acid product. The occurrence of side reactions can be effectively reduced by adopting sulfur trioxide as a sulphonating agent, and the molecular weight of a polymer obtained from polymerization of the obtained 2-acryloylamino-2-methyl propanesulfonic acid as a monomer is relatively high. In addition, the continuous synthesis mode can effectively reduce possibly produced adverse effects on the stability of the product quality in the operation process, so as to further improve the product yield and quality.

Description

technical field [0001] The invention relates to the technical field of production technology of chemical products, in particular to a continuous production method of 2-acrylamido-2-methylpropanesulfonic acid. Background technique [0002] 2-Acrylamide-2-methylpropanesulfonic acid (2-Acrylamide-2-methylpropanesulfonic acid) is a multifunctional water-soluble anionic monomer. It is a white crystalline solid and its structural formula is as follows. [0003] [0004] As shown in the structural formula, 2-acrylamido-2-methylpropanesulfonic acid has a carbon-carbon double bond, a carbonyl group, and a sulfonic acid functional group. The sulfonic acid group makes the molecule have good water solubility, good salt resistance, and good stability; the carbonyl group makes the molecule have good adsorption and complexation; the carbon-carbon double bond can make the molecule itself or with other The molecules undergo homopolymerization and / or copolymerization to form high polymers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C07C303/06C07C303/02C07C309/15C08F220/54
Inventor 穆晓蕾黄凤兴齐兰芝李斗星贾春革
Owner CHINA PETROLEUM & CHEM CORP
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