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. 19, 1999
Filed:
Apr. 27, 1998
Applicant:
Inventors:
Wolfgang Bergins, Castrop-Rauxel, DE;
Jorg Talbiersky, Dorsten, DE;
Assignee:
Rutgers VFT AG, Castrop-Rauxel, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568805 ; 568799 ; 568377 ;
Abstract
For the preparation of 3,5-dimethylphenol by catalytic demethylation of isophorone in the gas phase in the presence of a metal or a metal alloy as catalyst, an isophorone-containing process stream is guided through reaction zones that contain said catalyst, whereby the reactivity of the catalyst varies in the reaction zones and the process stream between these reaction zones is thermostated in zones that do nor contain any catalyst, whereby the residual isophorone is greatly reduced, and the yield of 3,5-dimethylphenol is increased.