Patent · US Expired

Process for the preparation of chromic acid

US5071522A · kind A · utility

1Cited by

1References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

Filing date	Feb 25, 1991
Grant date	Dec 10, 1991
Priority date	—
Expiry date	Feb 25, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25B1/22
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A process for the preparation of chromic acid by the electrolysis of dichromate and/or monochromate solutions in electrolytic cells in which the anode chamber and the cathode chamber are separated by a cation exchanger membrane, the improvement wherein the chromic acid content of the solution in the anode chamber is periodically increased above that of a continuous operating state.

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