Method for producing 2-acrylamido-2-methylpropanesulfonic acid

Through the continuous process, the constant temperature mixing and crystallization process of acetic acid and water is used to solve the problems of low purification yield and low purity of 2-acrylamido-2-methylpropanesulfonic acid in the existing technology, and achieve high purity. And high-yield production, the molecular weight of the product polymer meets oil field requirements, improving product quality stability.

CN104230763AActive Publication Date: 2014-12-24CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN201310224982.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2013-06-07
Publication Date
2014-12-24
Estimated Expiration
2033-06-07

AI Technical Summary

Technical Problem

The existing purification method of 2-acrylamido-2-methylpropanesulfonic acid has low yield, low purity, and complicated process, resulting in unstable product quality and difficulty in meeting the requirements of high molecular weight and high temperature-resistant and salt-resistant polymers in oil fields. Viscosity requirements.

Method used

Using a continuous process, acetic acid and water are mixed with crude 2-acrylamido-2-methylpropanesulfonic acid at a constant temperature, and then continuously fed into the crystallizer for crystallization. The temperature and residence time are controlled to obtain high-purity 2 -Acrylamide-2-methylpropanesulfonic acid, simplifying the process and avoiding the adverse effects of temperature rise and fall on the reaction.

Benefits of technology

Achieved the production of 2-acrylamido-2-methylpropanesulfonic acid with high purity (more than 98%) and high yield (more than 70%). The product quality is stable and the polymer molecular weight exceeds 18 million, meeting the high requirements of oil fields. Molecular weight and high viscosity requirements.

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Abstract

The invention discloses a method for producing a 2-acrylamido-2-methylpropanesulfonic acid. The method comprises the steps: mixing acetic acid with water, then mixing with a crude 2-acrylamido-2-methylpropanesulfonic acid with the mass content of 90-95%, keeping the temperature constant during the mixing process, and thus obtaining a dissolved solution; and then continuously introducing the prepared dissolved solution into a crystallizer, discharging crystals from an outlet of the crystallizer to obtain the 2-acrylamido-2-methylpropanesulfonic acid with the mass content of 98% or more. An oil field temperature-resistant and salt-resistant polymer formed by polymerization of the 2-acrylamido-2-methylpropanesulfonic acid produced by the method and acrylamide can achieve relatively high molecular weight and can be better applied in the oil field exploration field.
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