Process for the production of mobile pastes of washing-active .alpha.-sulfofatty acid ester salts of high solids content

US4820451A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Robert Piorr · Ratingen, DE
• Hans J. Rommerskirchen · Erkrath, DE
• Horst Ritterbex · Goldkronach, DE
• Frantisek Jost · Goldkronach, DE

Key dates

• Filing date: Oct 31, 1986
• Grant date: Apr 11, 1989
• Expiry date: Oct 31, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In the production of washing-active .alpha.-sulfofatty acid esters by sulfonation of fatty acid alkyl esters with SO.sub.3 in molar ratios of up to 1:2 and more especially of from 1:1.2 to 1:1.8 and subsequent working-up of the crude sulfonic acid in aqueous medium with salt formation, aqueous pastes which are mobile, more especially pumpable, at moderately elevated temperatures are obtained by subjecting the crude sulfonate before the treatment with the aqueous medium to a post-reaction with at least about 0.5 mole equivalent, based on the SO.sub.3 which is not used for the .alpha.-sulfonation, of monohydric alcohols and/or alkoxylation products thereof at temperatures above 70.degree. C. and adjusting the solids contents of the .alpha.-sulfofatty acid ester salts to more than 35% by weight in the subsequent aqueous working-up step.