Patent · US Active

Process for the production of toluene diisocyanate

US8030522B2 · kind B2 · utility

2Cited by

3References

6Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Joachim Zechlin · Neuss, DE
Bernd Pennemann · Moitzfeld, DE
Friedhelm Steffens · Leverkusen, DE
Wenbin JI · Longbeilingcun, CN

Key dates

Filing date	Jun 7, 2006
Grant date	Oct 4, 2011
Priority date	—
Expiry date	Apr 29, 2027

Classification

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

Abstract

The invention relates to a process for the production of toluene diisocyanate, in which the crude toluenediamine obtained from the hydrogenation is purified and then phosgenated. The purification step reduces the total amount of cyclic ketones to less than 0.1% by weight, based on 100% by weight of the toluenediamine.

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