Process for obtaining 1,5-dinitro-anthraquinone of high purity
AssigneeProduits Chimiques Ugine Kuhlmann
InventorMaurice R. J. Vallette
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Abstract
The invention relates to a process for obtaining 1,5-dinitro-anthraquinone of high purity from crude mixtures of dinitro-anthraquinones. Said mixture is treated at a temperature ranging from 150.degree. C. to 200.degree. C. with an ester having a boiling point greater than 150.degree. C. derived from an aliphatic alcohol containing 1 to 4 carbon atoms and a mono- or di-carboxylic acid or phosphoric acid, and then, after possible cooling without the temperature falling below 150.degree. C., separating the insoluble material consisting essentially of 1,5-dinitro-anthraquinone.
Claims9
A process for obtaining 1,5-dinitro-anthraquinone of high purity from a mixture containing in addition to the 1,5-dinitro-anthraquinone, up to 75% by weight of a member selected from the group consisting of other dinitro derivatives and mixtures thereof with mononitro-anthraquinone and anthraquinone, which comprises treating said mixture at a temperature ranging from 150.degree. C. to 200.degree. C. with an ester having a boiling point at atmospheric pressure greater than 150.degree. C. derived from an aliphatic alcohol containing 1 to 4 carbon atoms and a mono- or di-carboxylic acid or phosphoric acid, and then, after possible cooling without the temperature falling below 150.degree. C., separating the insoluble material consisting essentially of 1,5-dinitro-anthraquinone.
Dependencies are inferred from the claim text.