To solve a problem that 2-acrylamide-2-methylpropanesulfonic acid (ATBS) used in a wide variety of applications such as an acrylic-fiber modifier, a starting monomer of a dispersant or a coagulant, and a starting monomer for producing a thickener used in cosmetics or for producing a chemical agent used in an extensive recovery of crude oil, since a polymer produced from ATBS is required to have, in particular, a high molecular weight, and is required to have excellent polymerizability as well as stable quality.
There is disclosed an economically advantageous method of producing high quality ATBS, which method includes mixing acrylonitrile with sulfuric acid, causing the resulting liquid mixture to come into contact with isobutylene to allow the acrylonitrile, sulfuric acid, and isobutylene to react with each other while controlling the concentration of the sulfuric acid in the reaction liquid at 1.3 wt.% or higher to make the ATBS crystal of low impurities easily separable from the resulting ATBS slurry in the process of solid-liquid separation.
GOTO HIROKI
AMAMIYA TAKEYUKI
| JP2002531644A | 2002-09-24 |
| WO2009072480A1 | 2009-06-11 |