Patent · US Expired

Process for the preparation of alkali metal dichromates and chromic acid by electrolysis

US5127999A · kind A · utility

9Cited by

2References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Helmut Klotz · Friedrichshafen, DE
Rainer Weber · Leverkusen, DE
Norbert Lonhoff · Leverkusen, DE
Hans-Dieter Block · Cologne, DE
Hans-Dieter Pinter · Wermelskirchen, DE

Key dates

Filing date	Jun 10, 1991
Grant date	Jul 7, 1992
Priority date	—
Expiry date	Jun 10, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25B1/28
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A process for the preparation of alkali metal dichromates and/or chromic acid by electrolysis of alkali metal monochromate and/or alkali metal dichromate solution in electrolysis cells, the anode and cathode compartments of which are separated by cation exchange membranes, wherein the cation exchange membranes are single-layer membranes based on perfluorinated polymers having sulfonic acid groups as cation exchange groups, and an aqueous solution having a pH of 4 to 14 is produced in the cathode compartment of the cells.

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