Process for the continuous production of mono- and polyisocyanates

US4851570A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gottfried Zaby · Leverkusen, DE
• Helmut Judat · Langenfeld, DE
• Siegbert Humburger · Leverkusen, DE
• Stefaan De Vos · Rayong, TH
• Rolf-W. Eckermann · Bensberg, DE

Key dates

• Filing date: Oct 27, 1988
• Grant date: Jul 25, 1989
• Expiry date: Oct 27, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention relates to a process for the continuous production of an organic monoisocyanate or polyisocyanate in a single stage reaction. A reaction mixture is formed by continuously mixing, at a temperature elevated above room temperature but not exceeding about 150.degree. C., a solution in a substantially inert organic solvent of a monoamine or polyamine corresponding to the monoisocyanate or polyisocyanate and a solution in a substantially inert organic solvent of phosgene. The reaction mixture is continuously passed upwards from below through a reaction column comprising at least 10 separate chambers separated by perforated plates, wherein each perforation of said perforated plates has a diameter of less than about 20 mm.