Process for producing 1,5-dinitroanthraquinone and 1,8-dinitroan

Details Process for producing 1,5-dinitroanthraquinone and 1,8-dinitroan Process for producing 1,5-dinitroanthraquinone and 1,8-dinitroan

1974-10-10

1976-06-15

Demers, Arthur P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4968

Patent

active

039637620

ABSTRACT:
Substantially pure 1,5- and/or 1,8-dinitroanthraquinone is recovered from dinitration mixtures which may contain sulfuric acid or a perfluoralkane sulfonic acid by adjusting the nitric acid concentration in the nitration mixture to a value of 91 to 96% for a ratio by weight of nitric acid to solids of from 2.5 : 1 to 10 : 1; separating off the insoluble crude 1,5-dinitroanthranthraquinone at 15.degree. to 50.degree.C; taking up the 1,5-dinitroanthraquinone with 90 to 100% nitric acid in a ratio by weight of nitric acid to solids of from 0.5 : 1 to 3.5 : 1; stirring at 15.degree. to 80.degree. C; separating off the insoluble pure 1,5-dinitroanthraquinone thus obtained; adjusting the mother liquid left following separation of the crude 1,5-dinitroanthraquinone to a nitric acid concentration of from 88 to 94% for a ratio by weight of nitric acid to solids of from 3.0 : 1 to 12 : 1, with the proviso that the nitric acid concentration is at least 1.5% lower than in the preceding separation of crude 1,5-dinitroanthraquinone; and separating off the pure 1,8-dinitroanthraquinone obtained in this way at a temperature in the range of from 20.degree. to 50.degree.C and freeing it from the nitric acid adhering thereto.

REFERENCES:
patent: 3818052 (1974-06-01), Hohmann et al.
Kirk-Othmer Encyclopedia of Chemical Technology, vol. 2 (2nd Ed.), 1964 pp. 491-492.

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