Method of producing amino carboxylic acids

US6916947B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Oliver Meyer · Ingelheim am Rhein, DE
• Thomas Kalz · Herne, DE
• Karlheinz Drauz · Alzenau, DE

Key dates

• Filing date: Nov 25, 2002
• Grant date: Jul 12, 2005
• Expiry date: Jan 23, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention is directed to a method for producing amino acids by reacting halogenated carboxylic acid ester (haloacid esters) with a metal cyanate in the presence of an alcohol and by subsequent acidic saponification of the urethane carbonic acid formed. The method is characterized by the metal cyanate being placed at an elevated temperature in an organic solvent and the other reactants being continuously charged into the mixture over a defined time period.