Patent · US Expired

Decolorization of aqueous glyoxal solutions

US4728435A · kind A · utility

1Cited by

7References

14Claims

0Family size

Assignee

BASF SE

Inventors

Guenther Mueller · Flein, DE
Rolf Ramsteiner · Schifferstadt, DE
Fritz Graf · Speyer, DE
Leopold Hupfer · Friedelsheim, DE

Key dates

Filing date	Oct 6, 1986
Grant date	Mar 1, 1988
Priority date	—
Expiry date	Oct 6, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/917
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

An aqueous glyoxal solution is decolorized by a process in which the said solution is passed over granulated active carbon which is arranged in a fixed bed and whose differential pore radius distribution has a maximum of from 10 to 100 A, the Peclet number being from 500 to 5000, the decolorized glyoxal solution is discharged, the active carbon bed is then regenerated by treating it with an aqueous solution of an alkaline agent and then with an aqueous acid, and further glyoxal solution to be decolorized is passed over the active carbon regenerated in this manner.

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