Patent · US Active

Process for the distillative separation of aqueous amine solutions

US7575660B2 · kind B2 · utility

1Cited by

14References

9Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Friedhelm Steffens · Leverkusen, DE
Rainer Buse
Bill Brady · Goldkronach, DE

Key dates

Filing date	May 26, 2005
Grant date	Aug 18, 2009
Priority date	—
Expiry date	Apr 16, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S203/20
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to an energy efficient process for the distillative working-up of aqueous amine solutions that occur in the catalytic hydrogenation of nitroaromatic compounds. In this process, the amine is freed from water and also the water is obtained free from amine and low-boiling compounds and the concentrated low-boiling compounds are obtained.

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