PROCESS FOR THE PREPARATION OF MIXTURES OF DINITROANTHRAQUINONES WITH A HIGH CONTENT OF 1,5- AND 1,8- DINITROANTHRAQUINONE

摘要

PROCESS FOR THE PREPARATION OF MIXTURES OFDINITROANTHRAQUINONES WITH A HIGH CONTENT OF1,5- AND 1,8- DINITROANTHRAQUINONEABSTRACT OF THE DISCLOSUREA process has been developed for the preparation of mix-tures of dinitroanthraquinones with a high content of 1,5- and1,8- dinitroanthraquinone by nitration with nitric acid in thepresence of sulphuric acid with heating wherein anthraquinone,1-nitroanthraquinone or a mixture of them is treated with about1.5 to about 2.5 times the amount by weight of nitric acid,relative to the feed material, in the presence of about 0.75times to twice the amount by weight, relative to nitric acid,of sulphuric acid, the temperature first being kept in therange from room temperature to about 50°C until at least 50%of the starting material or materials has been dinitrated, thenadjusting the temperature to about 50°C to about 70°C to completethe dinitration.