Process for purification of crude 4,4'-diamino-1,1'-dianthraquin

Details Process for purification of crude 4,4'-diamino-1,1'-dianthraquin Process for purification of crude 4,4'-diamino-1,1'-dianthraquin

1993-08-19

1995-02-28

Cintins, Marianne M.

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

Organic compounds

Polycyclo ring system containing anthracene configured ring...

552211, C07D 8746

Patent

active

053938992

ABSTRACT:
Crude 4,4'-diamino-l,l'-dianthraquinonyl-3,3'-disulfonic acids or salts thereof are purified by subjecting an aqueous solution containing the crude products to salting-out using inorganic salts, the aqueous solution being adjusted within a range of from acid to neutral region, whereby a product usable as such for the production of 4,4'-diamino-1,1'-dianthraquinonyl red pigments having excellent pigmentary properties is obtained in high yields with industrial advantages.

REFERENCES:
patent: 2666768 (1952-06-01), Ulich et al.
patent: 3234242 (1966-02-01), Basel et al.
patent: 3471524 (1969-10-01), Wick et al.
patent: 3900472 (1975-08-01), Chang
patent: 4318848 (1982-03-01), Han-Heinz et al.
Chemical Abstracts 60:698e.

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