Patent ID: 6504050
Filing Date: 2003-01-07
Classification: C07C

Abstract:
A process for the preparation of 2-acrylamido-2-methyl-1-propane-sulfonic acid, which comprises mixing acrylonitrile with a mixture of sulfuric acid and a catalyst while maintaining a maximum temperature of 20Â° C., the ratio of acrylonitrile to mixture of sulfuric acid and catalyst being in the range of 3:1 to 6:1 and the ratio of catalyst to acrylonitrile being in the range of 0.02 to 100 to 4.0 to 100, followed by addition of isobutylene while maintaining a maximum temperature of 50Â° C. and separating the product formed, purifying the product by washing with acrylonitrile followed by drying under vacuum at a temperature in the range of 50 to 60Â° C. to obtain the desired product.