Manufacture of 2-amino-3-bromoanthraquinone

Details Manufacture of 2-amino-3-bromoanthraquinone Manufacture of 2-amino-3-bromoanthraquinone

1978-02-01

1979-02-13

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 9724, C09B 120

Patent

active

041395433

ABSTRACT:
In a process for the manufacture of 2-amino-3-bromoanthraquinone by heating 2-aminoanthraquinone with bromine (in the molar ratio of 1:1) in sulfuric acid, while mixing, the improvement wherein crude 2-aminoanthraquinone, in sulfuric acid of from 60 to 90 percent strength by weight, which contains from 10 to 15% by weight of an alkanecarboxylic acid of 3 or 4 carbon atoms or a mixture of such acids, is heated with from 1 to 1.05 moles of bromine per mole of 2-aminoanthraquinone at from 130 to 150.degree. C. The 2-amino-3-bromoanthraquinone which is isolated may be used for the manufacture of dyes. It is at least as pure as that obtained from purified 2-aminoanthraquinone by the process of the prior art.

REFERENCES:
patent: 2236672 (1941-04-01), Coffey et al.
patent: 2835700 (1958-05-01), Boyle et al.

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