Patent · US Expired

Recovery of aqueous glyoxylic acid solutions

US4902828A · kind A · utility

40Cited by

4References

9Claims

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	Oct 18, 1984
Grant date	Feb 20, 1990
Priority date	—
Expiry date	Oct 18, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/48
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Aqueous glyoxylic acid solutions, essentially free of other acids, are recovered from aqueous solutions which still contain other acids, by a method in which the aqueous solution is mixed with an organic nitrogen compound at as high as 50.degree. C., the phases are separated, and the glyoxylic acid is extracted from the organic phase with water, at a higher temperature.

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