Process for the manufacture of alkali metal salts of amino polycarboxylic acids

US3966803A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wilhelm Vogt · Lichtenau, DE
• Hubert Neumaier
• Erich Schallus
• Gunter Peantek

Key dates

• Filing date: Apr 25, 1975
• Grant date: Jun 29, 1976
• Expiry date: Apr 25, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C229/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Production of alkali metal salts of amino polycarboxylic acids by reaction of a suitable carboxylic acid nitrile with aqueous alkali at elevated temperature. The salts are produced from an amino polycarboxylic acid nitrile suspension in an aqueous alkali metal hydroxide solution, which has a minimum strength of substantially 30 % by weight and contains at least stoichiometric proportions of alkali metal hydroxide; the suspension is introduced into a reactor heated to a temperature between 60.degree. and 150.degree. C, and salt formation is effected by thorough agitation.