Patent · US Active

Method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate

US9505711B2 · kind B2 · utility

1Cited by

4References

22Claims

0Family size

Assignee

BASF SE

Inventors

Michael Bock · Ruppertsberg, DE
Johannes Jacobs · Ossendrecht, NL
Kai Thiele · Ekeren, BE
Anne-Kathrin Merten · Schwarzheide, DE

Key dates

Filing date	Nov 15, 2011
Grant date	Nov 29, 2016
Priority date	—
Expiry date	Apr 23, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/20
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4′-methylenediphenyl diisocyanate having a hydrolyzable chlorine content as specified in ASTM D4663-10 of greater than 100 ppm by means of a column K1, wherein the gaseous stream comprising the mixture I is brought into contact in the column K1 with at least one liquid compound A which has the same or higher boiling point than 4,4′-methylenediphenyl diisocyanate and which has a hydrolyzable chlorine content as specified in ASTM D4663-10 of a maximum of 100 ppm, and wherein the gaseous stream O obtained at the top of the column comprises 4,4′-methylenediphenyl diisocyanate has a hydrolyzable chlorine content as specified in ASTM D4663-10 of a maximum of 100 ppm.

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