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. 09, 1979
Filed:
Jul. 22, 1976
Applicant:
Inventors:
Horst Scheuermann, Ludwigshafen, DE;
Helmut Hoch, Wachenheim, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
260508 ;
Abstract
Dimethylaminobenzenesulfonates are manufactured by reacting nitrobenzenesulfonates with formaldehyde and hydrogen in the presence of a hydrogenation catalyst containing a metal of atomic number from 24 to 29 and of phosphoric acid and water at a pH of from 2 to 3.5, at from 50 to 150.degree. C, under a pressure of at least 40 bars, with a residence time of from 1 to 15 minutes. The products are starting materials for the synthesis of dyes, especially of rhodamine dyes, oxazine dyes and reactive dyes, and also of pharmaceuticals and pesticides.