Patent ID: 7592302
Filing Date: 2009-09-22
Classification: C11D

Abstract:
1. A process for producing a granular detergent comprising: (1) a step of preparing a paste containing α-sulfo fatty acid alkylester salt by a series of reactions of sulfonating a fatty acid alkylester with a sulfonating gas by contact with each other, esterifying the sulfonated product with a lower alcohol, neutralizing the esterified product, and bleaching the neutralized, product, to give a paste containing α-sulfo fatty acid alkylester salt; (2) a step of conducting a first aging of the thus obtained paste, wherein the first aging temperature is 60-90° C. and the first aging time is 1-48 hours: (3) a step of making the aged paste into flakes or pellets containing equal to or less than 10 wt % of water, or a step of making the aged paste into flakes or pellets containing equal to or less than 10 wt % of water and then crushing the resulting flakes or pellets into a powder having an average particle diameter of 100-1500 μm; (4) a step of conducting a second aging of the powder, flakes, or pellets, wherein the second aging temperature is 25-45° C. and the second aging time is equal to or longer than 30 minutes; and (5) a step of mixing or granulating the powder, flakes, or pellets obtained by the above step (4) with a detergent component by any method selected from powder mixing, kneading-crushing, and agitation granulation.