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US 5,212,302 AGranted
Process for producing epsilon-caprolactam and activating solid catalysts therefor
AssigneeSumitomo Chemical Company, Limited
InventorsMasaru Kitamura, Hiroshi Ichihashi, Hideto Tojima
Life of this patent
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Abstract
In the production of .epsilon.-caprolactam from cyclohexanon oxime in gaseous phase in the presence of solid catalysts, the catalysts, no matter whether they may have worked, are brought into contact with either aqueous solution of ammonium salts and at least one basic material or ammonia water.
Claims17
A process for producing .epsilon.-caprolactam from cyclohexanon oxime under a gaseous phase in the presence of solid catalysts which have been in contact with
- (1) aqueous solution of ammonium salts and at least one basic material selected from ammonia, lower alkylamines, allylamines and alkylammonium hydroxides, or
- (2) ammonia water.
Dependencies are inferred from the claim text.