Document Type and Number:
Japanese Patent JPH0437816
Kind Code:
B2
Abstract:
A process for purifying crude monochloro- or monobromoanthraquinone is described. In this process, monochloro- or monobromoanthraquinone which contains by-products as impurities is mixed with a hot non-polar aliphatic solvent in such a ratio that more than half of the crude product goes into solution and the remainder which contains the impurities forms a second lower phase, said eutectic melt is separated, and the saturated solution is allowed to cool, and the monochloro- or monobromoanthraquinone, which precipitates in pure form, is isolated.
Inventors:
TEIBOORU SOMURO
YOHAN REGURI
YOHAN REGURI
Application Number:
JP22343183A
Publication Date:
June 22, 1992
Filing Date:
November 29, 1983
Export Citation:
Assignee:
CIBA GEIGY
International Classes:
C07C46/10; C07C45/00; C07C50/24; C07C67/00
Next Patent: JPH0437817