Method and device for the selective extraction of halide ions fr

Details Method and device for the selective extraction of halide ions fr Method and device for the selective extraction of halide ions fr

1996-08-07

1997-10-21

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Regenerating image processing composition

Bleach-fix

430398, G03C 5395

Patent

active

056795033

ABSTRACT:
The invention concerns a method and a device for extracting the halide ions from fixing or bleaching/fixing photographic solutions containing mainly thiosulfate as the fixing agent, bringing the solutions into contact with a nanofiltration module including at least two membranes of different types.
The method enables the activity of the fixing or bleaching/fixing baths to be extended during the processing of photographic products.

REFERENCES:
patent: 3925175 (1975-12-01), Fisch et al.
patent: 4574049 (1986-03-01), Pittner
patent: 4995983 (1991-02-01), Eadie et al.
patent: 5219717 (1993-06-01), Shmittou
patent: 5234583 (1993-08-01), Cluff
patent: 5266203 (1993-11-01), Mukhopadhyay et al.

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