Patent · US Active

Process for the preparation of isocyanates in the gas phase

US7615662B2 · kind B2 · utility

10Cited by

6References

11Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Fritz Pohl · Wittmund, DE
Klaus Biskup · Leverkusen, DE
Rainer Bruns · Leverkusen, DE
Friedhelm Steffens · Leverkusen, DE
Herbert Stutz · Karlsruhe, DE

Key dates

Filing date	Dec 11, 2007
Grant date	Nov 10, 2009
Priority date	—
Expiry date	Dec 11, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling takes place in the cooling stretch in one stage in two or more cooling zones connected in series.

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