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:
May. 03, 1977
Filed:
Dec. 22, 1972
Applicant:
Inventors:
Reinold Schmitz, Blecher, DT;
Christoph M Wittig, Leverkusen, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260370 ;
Abstract
Process for the manufacture of practically mercury-free anthraquinonesulphonic acids, characterized in that anthraquinone is sulphonated with sulphuric acid containing SO.sub.3 in the presence of catalysts containing mercury, at elevated temperature, the sulphonation mixture, if appropriate after dilution with water, is subsequently treated with an inorganic or organic compound of divalent sulphur and thereafter, if appropriate following dilution with water, the mercury compounds present in an insoluble form are separated off and the anthraquinonesulphonic acids are then isolated in a known manner.