Recovery of color developer

Details Recovery of color developer Recovery of color developer

1977-11-21

1979-08-07

Lander, Ferris H.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 22R, 210321A, 210433M, 210500M, 210511, 96 55, 422256, 422259, B01D 1300, B01D 1100

Patent

active

041637135

ABSTRACT:
A method for the recovery of a color developing agent of the N,N-disubstituted paraphenylene diamine type is provided. The used color developing solution is placed in a cell member which is separated from a second cell member, which contains an aqueous acid solution by a semipermeable nonporous membrane.
The semi-permeable non-porous membrane has imbibed in it an organic solvent of low water miscibility in which the color developing agent is soluble. The color developing agent diffuses through the semi-permeable non-porous membrane and forms a salt with the aqueous acid, and is then used as such.

REFERENCES:
patent: 3769206 (1973-10-01), Brown et al.
patent: 3956112 (1976-05-01), Lee et al.

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