Patent · US Active

Method for producing diisocyanates by phosgenating diamine suspensions

US9272988B2 · kind B2 · utility

2Cited by

13References

9Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Jörg Laue · Olfen, DE
Christian Steffens
Jens Krause · Rahden, DE
Stefan Wershofen · Mönchengladbach, DE
Werner Kilian
Marc Seekamp · Erlangen, DE
Matthias Ruhland · Recklinghausen, DE

Key dates

Filing date	Sep 18, 2013
Grant date	Mar 1, 2016
Priority date	—
Expiry date	Sep 18, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C2602/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for producing organic diisocyanates by reacting the corresponding diamines with phosgene in inert solvents. High-melting diamines from the series of 1,5-naphthalenediamine, tetralindiamine, 1,4-phenylenediamine, durenediamine, and o-tolidinediamine are used as diamines. According to the invention, a suspension of the diamines in inert solvents is produced, wherein dynamic mixing units, selected from dispersion disks and rotor-stator systems, are used, and the obtained suspension is phosgenated.

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