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:
Jan. 22, 1980
Filed:
Feb. 01, 1979
Applicant:
Inventors:
Kurt Handrick, Essen-Steele, DE;
Georg Kolling, Essen-Bredeney, DE;
Clemens Linden, Essen-Bergerhausen, DE;
Assignee:
Bergwerksverband GmbH, Essen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C09B / ;
U.S. Cl.
CPC ...
260369 ;
Abstract
A process for the manufacture of anthraquinones in which o-benzyl-toluene is first oxidized with 25 to 50 weight-% nitric acid at atmospheric pressure and moderate temperatures, and then further oxidized with a more dilute nitric acid at elevated temperatures and pressures to yield crude o-benzoyl-benzoic acid. The crude product is then esterified with methanol, the methyl ester distilled and, when necessary, recrystallized, and heated with concentrated sulfuric acid to yield anthraquinone in high yield and of a high degree of purity.