Patent · US Expired

Process for separating mixtures of materials having different boiling points

US6359177B1 · kind B1 · utility

8Cited by

3References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Bill Brady · Goldkronach, DE
Guenther Weymans · Kempten (Allgäu), DE
Berthold Keggenhoff · Krefeld, DE

Key dates

Filing date	Dec 15, 2000
Grant date	Mar 19, 2002
Priority date	—
Expiry date	Dec 15, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C209/86
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A mixture of materials having different boiling points is separated into fractions having different boiling points. The separated fraction containing the desired product is stripped using the vapors of a lower boiling fraction. The process of the present invention is particularly useful for recovering a desired isomer or isomer mixture from a technical mixture obtained during production of an aromatic amine such as toluenediamine. Little or no unwanted isomer or by-product is present in the isomer or isomer mixture product of this process.

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