Process for the preparation of chloroformic acid methyl ester

US4261918A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Schulte-Huermann · Krefeld, DE
• Erhard Schellmann · Cologne, DE
• Jurgen Lahrs · Cologne, DE

Key dates

• Filing date: Oct 12, 1979
• Grant date: Apr 14, 1981
• Expiry date: Oct 12, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for the continuous preparation of chloroformic acid methyl ester by contacting phosgene with methanol at a temperature of up to 50.degree. C. in a reactor which contains chloroformic acid methyl ester as the solvent and in which phosgene is dispersed, the improvement wherein gaseous phosgene is dispersed by already formed and circulated chloroformic acid methyl ester into the reaction chamber by means of a dispersing device, and at the same time methanol is introduced into the homogeneous gas-in-liquid dispersion.