Patent · US Active

Process for the production of aromatic diisocyanates in the gas

US8399702B2 · kind B2 · utility

2Cited by

12References

15Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Fritz Pohl · Wittmund, DE
Klaus Biskup · Leverkusen, DE
Rainer Bruns · Leverkusen, DE
Friedhelm Steffens · Leverkusen, DE
Lars Padeken · Itzehoe, DE

Key dates

Filing date	Nov 20, 2008
Grant date	Mar 19, 2013
Priority date	—
Expiry date	Feb 12, 2031

Classification

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

Abstract

Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.

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