Process for obtaining .alpha.,.alpha.'-dinitro anthraquinones of

Details Process for obtaining .alpha.,.alpha.'-dinitro anthraquinones of Process for obtaining .alpha.,.alpha.'-dinitro anthraquinones of

1979-06-28

1981-12-22

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 7600

Patent

active

043070221

ABSTRACT:
The invention relates to a process for obtaining .alpha.,.alpha.'-dinitro-anthraquinones of high purity from crude mixtures obtained from the dinitration of anthraquinone. Such a mixture is placed in contact with an ester having a boiling point greater than 120.degree. C. derived from a mono- or di-carboxylic acid or phosphoric acid, at a temperature between 20.degree. and 200.degree. C. or more, then, after possible cooling, the insoluble material consisting essentially of the .alpha.,.alpha.'-dinitro-anthraquinones is separated.

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

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