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2-acrylamido-2-methylpropanesulfonic acid preparation method

A technology of methylpropanesulfonic acid and acrylamide, which is applied in the field of preparation of 2-acrylamido-2-methylpropanesulfonic acid, which can solve the problems of large refining and purification losses, multiple by-product impurities, and poor product quality. , to achieve the effect of high overall quality level, high dissolution clarity and low product loss

Active Publication Date: 2020-03-03
WEIFANG QUANXIN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many by-products will be produced in the synthesis of 2-acrylamido-2-methylpropanesulfonic acid, and the purity is not high, so it can only be used in industries with low requirements such as water treatment agents
[0007] On the whole, the 2-acrylamido-2-methylpropanesulfonic acid prepared by the prior art has poor product quality and low purity. It not only contains more by-product impurities, but also has a large amount of black after dissolution. Or white small particle impurities, which cannot meet the requirements of special industries such as medicine and cosmetics
Second, the refining and purification loss is large, the yield is low, and it is uneconomical

Method used

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  • 2-acrylamido-2-methylpropanesulfonic acid preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of crude 2-acrylamido-2-methylpropanesulfonic acid:

[0032] The raw material acrylonitrile and nicotinic acid were mixed at low temperature, and then passed through isobutylene to obtain a slurry, which was filtered and dried to obtain crude 2-acrylamido-2-methylpropanesulfonic acid, with a liquid phase purity of 97.1%.

[0033] (1) Add 200g of crude 2-acrylamido-2-methylpropanesulfonic acid and 0.0152g of p-hydroxyanisole to the mixture of 128g of purified water and 32g of ethanol at room temperature, and stir to dissolve;

[0034] (2) Add 3.6g of activated carbon. After stirring for 30min, filter.

[0035] (3) Control the temperature at 15°C, stir at a speed of 200 rpm, add acetone dropwise to the filtrate, after a period of time, the solution becomes turbid, and adjust the speed to 180 rpm;

[0036] Continue to drop at a slow and uniform speed for 2 hours, and add a total of 1800g of acetone dropwise;

[0037] After 1 hour, the temperature was lowered...

Embodiment 2

[0039] Preparation of crude 2-acrylamido-2-methylpropanesulfonic acid:

[0040] The raw material acrylonitrile and nicotinic acid were mixed at low temperature, and then passed through isobutylene to obtain a slurry, which was filtered and dried to obtain crude 2-acrylamido-2-methylpropanesulfonic acid, with a liquid phase purity of 97.1%.

[0041] (1) Add 200g of crude 2-acrylamido-2-methylpropanesulfonic acid and 0.02g of p-hydroxyanisole to the mixture of 140g of purified water and 60g of ethanol at room temperature, and stir to dissolve;

[0042] (2) Add 5g of activated carbon. After stirring for 30min, filter.

[0043] (3) Control the temperature at 18°C, stir at a speed of 200 rpm, add acetone dropwise to the filtrate, after a period of time, the solution becomes turbid, and adjust the speed to 180 rpm;

[0044] Continue to drop at a slow and uniform speed for 2.5 hours, and add a total of 2000g of acetone dropwise;

[0045] After 1 hour, the temperature was lowered t...

Embodiment 3

[0047] Preparation of crude 2-acrylamido-2-methylpropanesulfonic acid:

[0048] The raw material acrylonitrile and nicotinic acid are mixed at low temperature, and then passed through isobutene to obtain a slurry, which is filtered and dried to obtain crude 2-acrylamido-2-methylpropanesulfonic acid, the product liquid phase purity is 97.1%.

[0049] (1) Add 200g of crude 2-acrylamido-2-methylpropanesulfonic acid and 0.012g of p-hydroxyanisole to the mixture of 135g of purified water and 45g of ethanol at room temperature, and stir to dissolve;

[0050] (2) Add 4g of activated carbon. After stirring for 30min, filter.

[0051] (3) Control the temperature to 13°C, stir at a speed of 200 rpm, add acetone dropwise to the filtrate, after a period of time, the solution becomes turbid, and adjust the speed to 180 rpm;

[0052] Continue to drop at a slow and uniform speed for 2.5 hours, and add a total of 2280g of acetone dropwise;

[0053] After 1 hour, the temperature was lowered...

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Abstract

The invention provides a 2-acrylamido-2-methylpropanesulfonic acid synthesis method, which comprises the following steps: (1) synthesizing a crude product from 2-acrylamido-2-methylpropanesulfonic acid, and dissolving the crude product in a mixed solvent mainly containing water at a normal temperature according to a weight ratio of 1:0.8-1; (2) adding active carbon accounting for 1-2% of the totalamount into the mixed solution, stirring for 30 minutes, and filtering; and (3) adding a solventing-out agent into the filtrate in a dropwise manner, controlling the temperature at 0-50 DEG C, reducing the stirring frequency when the solution becomes turbid and crystals are separated out, continuously and slowly adding the solventing-out agent in a dropwise manner at a constant speed for 2-3 hours, keeping the temperature for 1 h after the adding, cooling to a temperature of below 10 DEG C, centrifuging, washing, and drying to obtain a 2-acrylamide-2-methylpropanesulfonic acid product. According to the invention, the method is small in product loss and high in yield, and the obtained product is high in quality and wide in application range, and can meet the use requirements of some special industries.

Description

technical field [0001] The invention relates to the technical field of production of chemical products, in particular to a preparation method of 2-acrylamido-2-methylpropanesulfonic acid. Background technique [0002] 2-Acrylamido-2-methylpropanesulfonic acid (AMPS for English abbreviation) has carbon-carbon double bonds, carboxyl groups and sulfonic acid groups in the molecule, endowing it with excellent unique properties. The carbon-carbon double bond can make the molecule itself or with other molecules homopolymerize and copolymerize to form a high polymer; the carboxyl group makes the molecule have excellent adsorption and complexation; the sulfonic acid group makes the molecule have excellent water solubility and salt resistance, And it has excellent stability; its application in some fields has become an irreplaceable monomer and polymer. Widely used in oil field chemistry, water treatment agent, chemical fiber, plastic, printing and dyeing, paint, surfactant, antista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/44C07C309/15
CPCC07C303/44C07C309/15Y02P20/10
Inventor 张坤树林普文李志军蒋华锋
Owner WEIFANG QUANXIN CHEM