Method for regenerating seasoned aqueous fixing or bleach/fixing

Details Method for regenerating seasoned aqueous fixing or bleach/fixing Method for regenerating seasoned aqueous fixing or bleach/fixing

1997-04-29

1999-09-28

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 430400, 430398, B01D 6100

Patent

active

059582456

ABSTRACT:
The invention concerns a method and a device for the selective extraction of the halide ions from photographic baths. According to the invention, the solutions to be treated are subjected to a first nanofiltration step 2 in diafiltration mode, then to a second nanofiltration step 3 in concentration mode. The method makes it possible to prolong the activity of the fixing or bleaching/fixing baths during the processing of photographic products.

REFERENCES:
patent: 3925175 (1975-12-01), Fisch et al.
patent: 4341629 (1982-07-01), Uhlinger
patent: 5219717 (1993-06-01), Schmittou et al.
patent: 5607592 (1997-03-01), Bernard et al.
patent: 5679503 (1997-10-01), Martin et al.
Mulder, M., "Basic Principles of Membrane Technology", 1990, pp. 334-336, Kluwer Academic Publishers.

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