Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1992-07-24
1993-09-07
Sever, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210 97, 2101952, 2102572, 21032172, B01D 6118, B01D 6122
Patent
active
052425975
ABSTRACT:
A method is presented for achieving constant purification cycle times over the life of an ultrafiltration membrane in a silver halide purification system. Silver halide emulsion pumped from a feed vessel enters an ultrapurification module wherein a permeate stream is separated from the emulsion. The permeate stream is then divided into a permeate-to-drain stream and a recycle stream. The recycle stream is returned to the feed vessel. By varying the amount of permeate recycled, a constant permeate-to-drain rate can be maintained, and hence the purification cycle time can be maintained constant despite fouling of the membrane.
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Eastman Kodak Company
Sever Frank
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