Gas separation: apparatus – Electric field separation apparatus – Including gas flow distribution means
Patent
1976-06-11
1977-12-27
Kelley, Mary F.
Gas separation: apparatus
Electric field separation apparatus
Including gas flow distribution means
G03C 532
Patent
active
040653137
ABSTRACT:
A monitoring technique for use in the regeneration of spent bleach-fix solution containing silver ion and ferrous ion resulting from photograhic processing. Regeneration comprises first treating the spent solution with elemental iron to reduce and chemically replace silver ion, and thereafter dispersing an oxidizing agent throughout the silver-free solution to convert ferrous ion to ferric ion. Exhaustion of the elemental iron in the silver replacement step or insufficient oxidation in the ferrous-ferric conversion step are electrochemically detected by comparison of the half-cell potential of a reference solution drawn from the bleach-fix solution in a region of the regenerative cycle where the solution is substantially insensitive to the exhaustion of the elemental iron and insufficient oxidation. Further provision of a continuously flushing reference solution provides longterm accuracy of the electrochemical monitoring method.
REFERENCES:
patent: 3709796 (1973-01-01), King et al.
patent: 3813246 (1974-05-01), Schranz et al.
patent: 3839162 (1974-10-01), Ammer
patent: 3865708 (1975-02-01), Light
patent: 3879203 (1975-04-01), Schranz et al.
patent: 3907568 (1975-09-01), Shirasu et al.
patent: 3964988 (1976-06-01), Riseman et al.
Dahl T. N.
Eastman Kodak Company
Kelley Mary F.
LandOfFree
Bleach-fix regeneration monitoring method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bleach-fix regeneration monitoring method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bleach-fix regeneration monitoring method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1036920