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A kind of continuous production method of 2-acrylamido-2-methylpropanesulfonic acid

A methylpropanesulfonic acid and acrylamide-based technology, applied in the preparation of sulfonic acid, organic chemistry, etc., can solve the problem that the product quality does not meet the high-purity requirements of polymerization, shorten the reaction cycle, scientific process design, proportioning constant effect

Active Publication Date: 2016-06-29
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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  • A kind of continuous production method of 2-acrylamido-2-methylpropanesulfonic 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 vessel. 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 re...

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 container. 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...

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 continuous production method of 2-acrylamido-2-methylpropanesulfonic acid, which comprises continuous mixing of acrylonitrile and sulfur trioxide, and the mixed liquid flows into the first-stage reactor and simultaneously passes into the The isobutene in the primary reactor is subjected to the primary reaction, and the reaction liquid of the primary reactor enters the secondary reactor to carry out the secondary reaction with the isobutylene and sulfur trioxide which are simultaneously passed into the secondary reactor, and then the secondary reaction The reaction liquid in the device is subjected to solid-liquid separation, and the obtained solid is dried to obtain 2-acrylamido-2-methylpropanesulfonic acid product. The use of sulfur trioxide as a sulfonating agent can effectively reduce the occurrence of side reactions, and the polymer obtained by polymerizing the obtained 2-acrylamido-2-methylpropanesulfonic acid as a monomer has a relatively high molecular weight. In addition, the continuous synthesis method can effectively reduce the adverse impact on the stability of product quality that may occur during the operation process, thereby further improving the yield and quality of the product.

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 Patents(China)
IPC IPC(8): C07C309/15C07C303/02C07C303/06C08F220/56C08F220/54
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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