PROCESS FOR THE REGULATION OF THE CONTENT OF DI-SALTS IN APHA-SULPHO FATTY-ACID ESTERS TENSIDES

摘要

In light colored surfactants produced by sulfonation of fatty acid alkyl esters with less than 2 moles of SO3 per mole of fatty acid alkyl ester and subsequent work-up of the crude sulfonate in aqueous medium to form salts, the content of alpha -sulfofatty acid disalts is regulated and reduced by transesterifying the sulfonation product before its treatment with an aqueous medium with at least about 0.5 mole equivalent of an alcohol, based on the SO3 which is not for alpha -sulfonation.