Method for working up distillation residues from isocyanate production

US9029595B1 · kind B1 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Friedhelm Steffens · Leverkusen, DE
• Tim Loddenkemper · Dormagen, DE
• Rainer Bellinghausen · Neunburg vorm Wald, DE
• Hartwig Kempkes · Overath, DE

Key dates

• Filing date: Jul 9, 2013
• Grant date: May 12, 2015
• Expiry date: Jul 9, 2033

Classification

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

Abstract

The present invention relates to a method for working up distillation, residues from isocyanate production in which monomeric isocyanate present in distillation residues is recovered by means of a spray-dry method and the overall yield of monomeric isocyanate is thus significantly increased.