PROCESS FOR PRODUCING LIGHT-COLOURED PASTES OF alpha-SULPHO FATTY ACID ALKYL ESTER ALKALI METAL SALTS.

摘要

PCT No. PCT/EP91/00951 Sec. 371 Date Nov. 25, 1992 Sec. 102(e) Date Nov. 25, 1992 PCT Filed May 21, 1991 PCT Pub. No. WO91/18874 PCT Pub. Date Dec. 12, 1991.In the production of alpha -sulfofatty acid alkyl ester alkali metal salt pastes by reaction of fatty acid alkyl esters with gaseous SO3, subsequent after-reaction in liquid phase and neutralization with aqueous alkali metal hydroxide solutions, the crude sulfonation product is fed to an at least two-stage cascade of stirred tanks equipped with heating and cooling systems in which it is subjected with mechanical agitation to a temperature-controlled after-reaction until a degree of sulfonation of at least 90% is reached, after which the aged sulfonation product is further processed in known manner to alpha -sulfofatty acid alkyl ester alkali metal salt pastes.