Process for the production of highly concentrated pastes of .alpha.-sulfofatty acid alkyl ester alkali metal salts

US5382677A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Dietmar Colignon · Erkrath, DE
• Erich Dorra · Goldkronach, DE
• Guenter Panthel · Haan, DE
• Wolfgang Schmidt · Frankfurt, DE
• Norbert Wrede · Goldkronach, DE

Key dates

• Filing date: Nov 24, 1992
• Grant date: Jan 17, 1995
• Expiry date: Nov 24, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D1/28
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In the production of highly concentrated pastes of .alpha.-sulfofatty acid alkyl ester alkali metal salts by reaction of fatty acid alkyl esters with gaseous SO.sub.3, subsequent after-reaction in liquid phase and neutralization with aqueous alkali hydroxide solutions, the sulfonation product and aqueous alkali metal hydroxide solution are introduced during neutralization into an aqueous phase initially containing at least 55% by weight washing-active substance at a pH value in the range from 2 to 8 and washing-active substance contents of 60 to 70% by weight are established.