Continuous process for the preparation of organic isocyanates

US5599968A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Robert Bankwitz · Kempen, DE
• Herbert Gebauer · Krefeld, DE
• Christian K onig · Kaarst, DE
• Eckart Waldau · Bocholt, DE

Key dates

• Filing date: Dec 4, 1995
• Grant date: Feb 4, 1997
• Expiry date: Dec 4, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/01079
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Organic isocyanates are continuously prepared by reacting primary organic amines with phosgene in the presence of an inert, organic solvent, with the reaction mixture being circulated by means of a bubble column at a temperature of from 60.degree. to 100.degree. C. and with the ratio of the quantity of the circulated amine reaction products to the quantity of the amine supplied of from 100:1 to 5:1.