Process for the purification of photographic developer substance

Details Process for the purification of photographic developer substance Process for the purification of photographic developer substance

1981-08-03

1983-03-08

Doll, John

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564437, C07C 8526

Patent

active

043762166

ABSTRACT:
A new process for the purification of photographic developer compounds using an anionic surfactant wherein unwanted impurities are removed either by being precipitated or dissolved.
In this process the developer substance is freed from difficult to remove impurities.

REFERENCES:
patent: 2019032 (1935-10-01), Weiss et al.
patent: 2035510 (1936-03-01), Semenoff
patent: 2744938 (1956-05-01), Urban
patent: 2950319 (1960-08-01), Schenck et al.
patent: 3184511 (1965-05-01), Bevan et al.
patent: 3203994 (1965-08-01), Spiegler
patent: 3301903 (1967-01-01), Cryer et al.

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