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

US5391782A · 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 23, 1992
• Grant date: Feb 21, 1995
• Expiry date: Nov 23, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/17
• 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 0 to 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.