Process for treating photographic washing waters

Details Process for treating photographic washing waters Process for treating photographic washing waters

1985-06-17

1986-12-30

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210684, 210904, C02F 142

Patent

active

046327630

ABSTRACT:
Hexacyanoferrate ions are removed from washing waters using a weakly basic anion exchanger of the acrylic type containing tertiary amino groups. The anion exchanger is treated with an alkali metal hydroxide and an alkali metal dihydrogen phosphate solution.

REFERENCES:
patent: 3788983 (1974-01-01), Fries
patent: 3869383 (1975-03-01), Shimamura et al.
patent: 3931004 (1976-01-01), Shimamura et al.
patent: 3984314 (1976-10-01), Fries
patent: 4043907 (1977-08-01), Shimamura et al.
patent: 4115260 (1978-09-01), Avery
patent: 4267159 (1981-05-01), Crits

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