Method for producing 1-nitroanthraquinone
AssigneeSumitomo Chemical Company, Limited
InventorsAkira Fukasawa, Shinzaburo Masaki, Norio Serizawa
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Abstract
Anthraquinone is nitrated using a mixed acid comprising sulfuric acid and nitric acid, the concentration of sulfuric acid being 70 to 76% by weight and the amount of nitric acid being 33 to 55% by weight based on the total weight of sulfuric acid and nitric acid, whereby 1-nitroanthraquinone is obtained in a high yield and a high purity.
Claims6
A method for producing 1-nitroanthraquinone by nitration of anthraquinone, which comprises reacting anthraquinone at a temperature of 30.degree. to 80.degree. C. with a mixed acid comprising sulfuric acid and nitric acid, the concentration of sulfuric acid being 70 to 76% by weight and the amount of nitric acid being 33 to 55% by weight based on the total weight of sulfuric acid and nitric acid, and then separating the reaction mixture into a crystal portion of 1-nitroanthraquinone and a liquid portion of the mixed acid.
Dependencies are inferred from the claim text.