The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1976
Filed:
Dec. 22, 1975
Applicant:
Inventors:
Assignee:
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260378 ;
Abstract
A process for purifying 1-aminoanthraquinone, which comprises hydrogenating crude 1-aminoanthraquinone containing diaminoanthraquinones in an aqueous medium in the presence of a base using a hydrogenating catalyst to form a mixture comprising 1-aminoanthrahydroquinone and the corresponding diaminoanthrahydroquinones, partially oxidizing the mixture, removing water-insoluble materials from the oxidation product, and then oxidizing the remaining water-soluble residue.