Phosgene having low content of carbon tetrachloride

US6930202B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jürgen Heuser · Krefeld, DE
• Hermann Kauth · Krefeld, DE
• Christian Kords · Krefeld, DE

Key dates

• Filing date: Oct 12, 1999
• Grant date: Aug 16, 2005
• Expiry date: Oct 12, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B32/80
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing phosgene having low content of carbon tetrachloride is disclosed. The process entails reacting carbon monoxide with chlorine in the presence of elemental carbon, in a reactor. Critically the temperature of the gas stream emerging from the reactor is restricted to 30 to 80° C. and its pressure, measured directly downstream from said reactor is restricted to 120 to 400 kPaabs. The phosgene thus produced has a content of carbon tetrachloride that is less than 150 ppm.