| abstract |
In the production of wash-active alpha-sulfofatty acid esters by sulfonating fatty acid alkyl esters with SO3 in molar ratios up to 1: 2, in particular from 1: 1.2 to 1: 1.8, and subsequent processing of the crude sulfonic acid in an aqueous medium with salt formation, aqueous pastes are used can be moved at moderately elevated temperatures, in particular can be pumped, by obtaining the crude sulfonate before treatment with an aqueous medium in a post-reaction with at least about 0.5 mol equivalent - based on the amount of SO3 not used for alpha-sulfonation Subjects monohydric alcohols and / or their alkoxylation products at temperatures above 70 C and in the subsequent aqueous workup sets solids contents of the alpha-sulfofatty acid ester salts above 35 percent by weight. |