Separation of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquin

Details Separation of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquin Separation of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquin

1976-09-16

1977-10-11

Curtis, Allen B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260705, C07C 7600, C09B 100

Patent

active

040534880

ABSTRACT:
A process for separating 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone by heating a dinitroanthraquinone mixture, in a mixture of from 5 to 85 per cent by weight of N-methylpyrrolidone and from 95 to 15 per cent by weight of an organic liquid which boils at from 80.degree. to 210.degree. C and is miscible in all proportions with N-methylpyrrolidone, at from 60.degree. to 180.degree. C, and separating off the undissolved material, at the extraction temperature, after the solution equilibrium has been reached. The insoluble material contains more than 85 per cent by weight, and as a rule more than 90 per cent by weight, of 1,5-dinitroanthraquinone. From the extract, it is possible to isolate the dissolved 1,8-dinitroanthraquinone together with the dissolved 1,5-dinitroanthraquinone and any byproducts which may be present.

REFERENCES:
patent: 3929841 (1975-12-01), Ackermann et al.
Bikkulov, A. et al., "Recovery of Aromatic Hydrocarbons" in Chem. Ab. 3919c, vol. 78, 1973 p. 327, Abstract of (A).

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