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US 4,053,488 AGranted
Separation of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone
AssigneeBASF SE
InventorsHilmar Bruenemann, Heinz Eilingsfeld, Dietrich Lach
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AssigneeBASF SE
InventorsHilmar Bruenemann, Heinz Eilingsfeld, Dietrich Lach
Estimating the term…
A process for separating 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone by heating a dinitroanthraquinone mixture, in a mixture of from 5 to 85 per cent by weight of N-methylpyrrolidone and from 95 to 15 per cent by weight of an organic liquid which boils at from 80.degree. to 210.degree. C and is miscible in all proportions with N-methylpyrrolidone, at from 60.degree. to 180.degree. C, and separating off the undissolved material, at the extraction temperature, after the solution equilibrium has been reached. The insoluble material contains more than 85 per cent by weight, and as a rule more than 90 per cent by weight, of 1,5-dinitroanthraquinone. From the extract, it is possible to isolate the dissolved 1,8-dinitroanthraquinone together with the dissolved 1,5-dinitroanthraquinone and any byproducts which may be present.
A process for separating 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone which comprises heating a dinitroanthraquinone mixture, in a mixture of (a) from 5 to 85 percent by weight of N-methylpyrrolidone and (b) from 95 to 15 percent by weight of at least one aromatic benzenehydrocarbon, aromatic chlorohydrocarbon, aromatic-aliphatic ether, aromatic-aliphatic ketone, monohydric aliphatic alcohol of 3 to 10 carbon atoms, alkanediol of 2 or 3 carbon atoms, aliphatic carboxylic acid of 2 to 6 carbon atoms or mixtures thereof, the boiling points of the respective constituents of (b) being from 80.degree. to about 210.degree. C. and said constituents (b) being miscible in all proportions with N-methylpyrrolidone, at from 60.degree. to 180.degree. C. and when the solution equilibrium has been reached, separating the undissolved material from the liquid phase at the extraction temperature.
Dependencies are inferred from the claim text.