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:
Aug. 30, 1977
Filed:
Dec. 17, 1974
Applicant:
Inventor:
Axel Vogel, Cologne, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
260369 ;
Abstract
The present invention relates to a process for separating substantially pure 1,5-dinitroanthraquinone and substantially pure 1,8-dinitroanthraquinone from anthraquinone dinitration mixtures containing 1,5- and 1,8-dinitroanthraquinone, whereby such mixtures are treated with a mixture of concentrated nitric acid and an inert organic solvent, the insoluble 1,5-dinitroanthraquinone is separated off and the 1,8-dinitroanthraquinone isolated from the remaining mother liquor.