PROCESS FOR SEPARATING DINITROANTHRAQUINONES FROM RESIDUAL MIXTURES RESULTING FROM THE NITRATION OF ANTHRAQUINONE

摘要

1529168 Separation of dinitroanthraquinones from anthraquinone nitratic products CIBAGEIGY AG 30 Aug 1977 [30 Aug 1976] 36227/77 Heading C2C The invention comprises a process for the separation of dinitro anthraquinones from residual mixtures resulting from the nitration of anthraquinone after isolations of 1,5 and 1,8-dinitroanthroquinones obtained as reaction products, and containing hydroxynitronathraquinones, which process comprises treating the solid residual mixtures with concentrated sulphuric acid or oleum at a temperature between room temperature and 110‹ C. and separating the dinitroanthraquinones from the resultant suspension by filtration.