| abstract |
According to a process for the production of highly concentrated pastes of alkali metal salts-alkyl esters of alpha-sulfonated fatty acids, alkyl esters of fatty acids are reacted with SO 3 gas, they are subsequently reacted in the liquid phase and they are reacted. neutralizes with aqueous solutions of alkali hydroxides. During neutralization, the sulphonation product and the aqueous alkali metal hydroxide solution are introduced, maintaining a pH in the range between 2 and 8, into an aqueous phase which initially contains at least 55% by weight of 'a detergent substance and the content of detergent substance is adjusted between 60 and 70% by weight. |