Patent · US Expired

Purification of aqueous glyoxal solutions

US4521632A · kind A · utility

2Cited by

4References

14Claims

0Family size

Assignee

BASF SE

Inventors

Gerhard Wickenhaeuser · Birkenheide, DE
Bernd Heida · Haßloch, DE
Fritz Graf · Speyer, DE
Leopold Hupfer · Friedelsheim, DE

Key dates

Filing date	Jan 23, 1984
Grant date	Jun 4, 1985
Priority date	—
Expiry date	Jan 23, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C45/80
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Aqueous solutions of glyoxal which contain acids are purified by treatment with a solution which contains from 20 to 60% by weight of a tertiary amine and from 80 to 40% by weight of an alcohol which is not infinitely miscible with water, the treatment being carried out by mixing the two solutions during a residence time of less than 5 minutes.

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