Process for separating solid 1,5- and/or 1,8-dinitroanthraquinon

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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159 2R, C07C 4968

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043893449

ABSTRACT:
A process and an equipment for obtaining dry 1,5- and/or 1,8-dinitroanthraquinone from suspensions which contain liquid nitrobenzene whereby in a first stage solid 1,5- and/or 1,8-dinitroanthraquinone with a content of less than 30% by weight of nitrobenzene is separated off mechanically from the suspension at elevated temperature and whereby in a second stage the residued nitrobenzene is removed from the separated 1,5- and/or 1,8-dinitroanthraquinone by lowering the pressure during which the temperature falls.

REFERENCES:
patent: 3836547 (1974-09-01), Toth
patent: 3836601 (1974-09-01), Frey et al.
patent: 4031116 (1977-06-01), Thiem et al.
patent: 4076734 (1978-02-01), Yamada et al.

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