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:
Apr. 06, 1976
Filed:
Apr. 01, 1975
Abraham H de Rooij, Geleen, NL;
Stamicarbon, B.V., Geleen, NL;
Abstract
An improved cyclic process for producing cyclohexanone oxime is provided wherein the circulating reaction medium is subjected to a heat treatment of at least 40.degree.C in the presence of nitrous gases as it circulates between the oxime synthesis zone and the hydroxylamine synthesis zone. The residual cyclohexanone oxime is hydrolyzed to cyclohexanone in said heat treatment in the presence of nitrous gases. The reaction medium is then stripped of cyclohexanone prior to recirculating to the hydroxylamine synthesis zone. In another embodiment of the invention the recirculating reaction mixture is heated to at least 50.degree.C in the presence of nitrous acid as the mixture circulates between the oxime synthesis zone and the hydroxylamine synthesis zone, thus reducing the amount of residual cyclohexanone oxime and cyclohexanone to an insignificant amount.