Work-up of distillation residues from the synthesis of toluene diisocyanate

US6673960B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Hans Volkmar Schwarz · Waterloo, BE
• Markus Maurer · Gettorf, DE
• Michael Sander · Blankenloch, DE
• Eckhard Ströfer · Mannheim, DE
• Rene Leuthold · Hohenbocka, DE
• Burghard Hantel · Cosel, DE
• Siegfried Richter · Schraden, DE
• Jörg Therre · Worms, DE

Key dates

• Filing date: Dec 14, 2000
• Grant date: Jan 6, 2004
• Expiry date: Dec 14, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2612
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for working up distillation residues from the synthesis of tolylene diisocyanate by reaction of the distillation residues with water comprises reacting the TDI distillation residues with water in a continuous or semicontinuous process in a backmixed reactor in the presence of hydrolysate.