Process for preparing isocyanates

US8492580B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Bernhard Geissler · Schwarzenbruck, DE
• Eckhard Stroefer · Mannheim, DE
• Andreas Schmidt · Braunschweig, DE
• Matthias Kloetzer · Kröppen, DE

Key dates

• Filing date: Aug 2, 2010
• Grant date: Jul 23, 2013
• Expiry date: May 4, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to an improved multistage process for the continuous preparation of diisocyanates by reaction of the corresponding diamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric urethanes and thermal dissociation of the latter.