Process for obtaining 1,5-dinitro-anthraquinone of high purity

Details Process for obtaining 1,5-dinitro-anthraquinone of high purity Process for obtaining 1,5-dinitro-anthraquinone of high purity

1979-06-28

1981-12-22

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 7600

Patent

active

043070213

ABSTRACT:
The invention relates to a process for obtaining 1,5-dinitro-anthraquinone of high purity from crude mixtures of dinitro-anthraquinones. Said mixture is treated at a temperature ranging from 150.degree. C. to 200.degree. C. with an ester having a boiling point greater than 150.degree. C. derived from an aliphatic alcohol containing 1 to 4 carbon atoms and a mono- or di-carboxylic acid or phosphoric acid, and then, after possible cooling without the temperature falling below 150.degree. C., separating the insoluble material consisting essentially of 1,5-dinitro-anthraquinone.

REFERENCES:
patent: 4042604 (1977-08-01), Eilingsfeld et al.
patent: 4053488 (1977-10-01), Bruehemann et al.

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