Patent · US Active

Process and apparatus for preparing isocyanates

US9006481B2 · kind B2 · utility

2Cited by

6References

10Claims

0Family size

Assignee

BASF SE

Inventors

Torsten Mattke · Ludwigshafen am Rhein, DE
Carsten Knoesche · Niederkirchen, DE
Bernd Rumpf · Hockenheim, DE
Eckhard Stroefer · Mannheim, DE

Key dates

Filing date	Mar 18, 2010
Grant date	Apr 14, 2015
Priority date	—
Expiry date	Mar 2, 2032

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF28D13/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, optionally in the presence of an inert medium, in which phosgene and amine are first evaporated and then superheated further to reaction temperature, and the superheated phosgene and amine are mixed and fed to a reactor in which the phosgene and the amine are converted to the isocyanate, wherein the residence time of the phosgene at temperatures greater than 300° C. is not more than 5 s, and/or the temperature of heat transfer surfaces in contact with phosgene is not more than 20 K above the phosgene temperature to be established. The invention further relates to an apparatus for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.