Patent · US Active

Process for preparing isocyanates

US8809575B2 · kind B2 · utility

2Cited by

2References

19Claims

0Family size

Assignee

BASF SE

Inventors

Carsten Knoesche · Niederkirchen, DE
Torsten Mattke · Ludwigshafen am Rhein, DE
Patric Mueller · Mutterstadt, DE

Key dates

Filing date	Nov 30, 2009
Grant date	Aug 19, 2014
Priority date	—
Expiry date	Mar 1, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/10
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 the amine and the phosgene are first mixed and converted to the isocyanate in a reactor, and in which a reaction gas (1) which comprises isocyanate and hydrogen chloride leaving the reactor is cooled in a quench (3) by adding a liquid quench medium (5) to form a mixture of reaction gas and quench medium as the product stream (7). The quench medium (5) used is a mixture which comprises at least one solvent and isocyanate and which is withdrawn from the preparation process, any solid particles present in the quench medium (5) being removed before addition to the quench (3).

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