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:
Feb. 24, 1976
Filed:
Jan. 17, 1975
Abraham H de Rooij, Geleen, NL;
Stamicarbon B.V., Geleen, NL;
Abstract
An improved recycle process for the production of cyclohexanone oxime comprising circulating an acidic, aqueous solution containing phosphoric acid or ammonium bisulphate or a mixture thereof between a hydroxylamine synthesis zone and a cyclohexanone oxime synthesis zone. Nitrate ions are added to the aqueous solution just prior to the hydroxylamine synthesis zone and catalytically reduced with molecular hydrogen. The aqueous solution from the hydroxylamine synthesis zone is then fed to the cyclohexanone oxime synthesis zone along with a ketone. The aqueous solution is then separated from the oxime formed, either (a) treated at an elevated temperature for a sufficient time to decompose any trace amounts of oxime and cyclohexanone or (b) subjected to a stripping step to remove any trace amounts of oxime and cyclohexanone before being recirculated to the hydroxylamine synthesis zone. The oxime formed by this process is a valuable commercial commodity.