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. 23, 1989
Filed:
Jul. 09, 1987
Milos Rusek, Binningen, CH;
Hermann Kny, Fullinsdorf, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
A process for the preparation of indoline without substantial formation of indole, comprises passing 2-(2-aminophenyl)ethanol, in a vapor phase and admixed with a carrier gas, at a temperature of from about 240.degree. to about 260.degree. C. over at least a catalytic amount of a metal silicate or aluminosilicate containing alkaline earth metal or rare earth metal ions. The carrier gas can be water in the form of steam. The passage of 2-(2-aminophenyl)ethanol over the catalyst can be periodically terminated and the catalyst reactivatd by passing a mixture of air and nitrogen over the catalyst at a temperature of from about 300.degree. to about 550.degree. C., after which the passage of 2-(2-aminophenyl)ethanol and carrier gas can be resumed.