Isolation of dinitroanthraquinone having a high content of .alph

Details Isolation of dinitroanthraquinone having a high content of .alph Isolation of dinitroanthraquinone having a high content of .alph

1976-05-14

1977-08-16

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 100, C07C 7937

Patent

active

040426041

ABSTRACT:
A process for the isolation of mixtures of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone which have a high content of .alpha.,.alpha.'-dinitroanthraquinones by heating a suspension of the crude dinitroanthraquinone mixture in certain organic liquids at from 60.degree. to 200.degree. C until solution equilibrium has been set up, and separating the undissolved material from the solution. The undissolved material contains more than 90% and as a rule more than 95% by weight of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone. The pure mixture of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone may be used for the manufacture of dyes.

REFERENCES:
patent: 1622168 (1927-03-01), Stein
patent: 1758855 (1930-05-01), Schmidt et al.
patent: 3929841 (1975-12-01), Ackermann et al.
patent: 3939185 (1976-02-01), Vogel

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