Method and apparatus for regenerating spent photographic bleach-fixer solution
US4204930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1979 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Apr 13, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/3956
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for regenerating a spent bleach-fixer solution by electrodialysis using an electrodialysis cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compartment, a plurality of intermediate enionation and deionation compartments with a set of the deionation compartments alternately disposed between a set of the enionation compartments, and an anode compartment; said method comprising filling an electrolyte solution in the cathode compartment, the enionation compartments and anode compartment, and the spent bleach-fixer solution in the deionation compartments, and passing a direct electric current across the cathode and the anode; and an apparatus for use in the aforesaid method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.