Synthesis process of sulfonic group containing dirt dispersion agent

Abstract

The invention provides a synthesis process of a sulfonic group containing dirt dispersion agent. The synthesis process comprises the following steps: (1) adding sodium hypophosphite into a kettle residual mixed solution in the process for producing 2-acrylamido-2-methyl propane sulfonic acid, wherein the weight ratio of the mixed solution to the sodium hypophosphite is 90 to (1-2); (2) heating the mixed solution in the step (1), and stopping the heating when the temperature rises to 80 to 85 DEG C; (3) dropwise adding crylic acid and initiator into the mixed solution of the step (2), wherein the weight ratio of the cryic acid to the initiator is 20 to (1-2); (4) maintaining the temperature for 1 to 1.5 hours, and cooling the mixed solution to 45 to 55 DEG C; (5) adding sodium hydroxide of concentration of 50% into the mixed solution of the step (4), adjusting the pH to 3 to 4, and obtaining brownish red clear liquid. By adopting the synthesis process of the sulfonic group containing dirt dispersion agent, the problem for treating the kettle residue after acrylonitrile is distilled and recovered in the process for producing 2-acrylamido-2-methyl propane sulfonic acid or for co-producing N-tert-butyl acrylamide can be solved.

Description

technical field [0001] The invention belongs to the technical field of synthesis of antiscaling and dispersing agents, and in particular relates to a synthesis process of antiscaling and dispersing agents containing sulfonic acid groups. Background technique [0002] During the production of 2-acrylamido-2-methylpropanesulfonic acid, or the co-production of N-tert-butylacrylamide from 2-acrylamido-2-methylpropanesulfonic acid, the solvent acrylonitrile will be recovered after distillation A small amount of kettle residue. After testing, it was found that these still residues actually contained a large amount of useful substances, mainly including N-tert-butylacrylamide and some compounds containing sulfonic acid groups with unsaturated bonds. These substances have the potential to form polymers because of their unsaturated double bonds, and the polymers containing sulfonic acid groups have good dispersion properties for calcium phosphate scale in high temperature environmen...

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