Process for the separation of dinitroanthraquinone mixtures

Details Process for the separation of dinitroanthraquinone mixtures Process for the separation of dinitroanthraquinone mixtures

C - Chemistry, Metallurgy

07

C

260/236.33

C07C 79/37 (1980.01)

Patent

CA 1111032

ABSTRACT OF THE DISCLOSURE A process has been developed for the separation isomers of 1,5-dinitroanthraquinone (particularly 1,8-dinitroanthraquinone) from 1,5-dinitroanthraquinone which comprises a) treating 1 part by weight of a dinitroanthraquinone mixture with 4.5-9 parts by weight of nitrobenzene and/or with the solution obtained after the separation of 1,5-dinitroanthraquinone according to step b) and/ or the solution obtained after the separation of the 1,X- (X = 5, 6, 7 and 8)-dinitroanthraquinone mixture at a temperature of 100 to 200°C and then separating off the unsoluble constituents at 100 - 150°C, b) treating the residue which is obtained according to step a) and essentially consists of 1,5-dinitroanthraquinone, with 1-4 parts by weight of nitrobenzene at a temperature from 140°C to the boiling point, then cooling the mixture to 90 to 130°C and separating the 1,5-dinitroanthra- quinone which is not dissolved, c) cooling the solution obtained after the separation of the unsoluble constituents according to step a) to 90 to 120°C and separating off the 1,8-dinitroanthraquinone which has crystallised out.

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