Production of epsilon-caprolactam
AssigneeSumitomo Chemical Company, Limited
InventorsHiroshi Sato, Kenichi Hirose, Norio Ishii, Youichi Umada
Life of this patent
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Abstract
.epsilon.-caprolactam is prepared by gas phase catalytic synthesis in which cyclohexanone oxime is brought into contact with crystalline alluminosilicate, for example, ZSM-5 H.sup.+ form) having 1-12 of constraint index, 500 or more, preferably 1000 or more, of Si/Al atomic ratio and 5.mu. equivalent/g or less, preferably 2.mu. equivalent/g, of external acid amount.
Claims14
A method for preparing .epsilon.-caprolactam which comprises bringing cyclohexanone oxime in a gaseous phase into contact with crystalline alumino-silicate catalyst having 1-12 of constraint index, 500 or more of Si/Al atomic ratio and 5.mu. equivalent/g or less of external acid amount.
A method for preparing .epsilon.-caprolactam comprising:
- bringing cyclohexanone oxime in a gaseous phase into contact with a crystalline alumino-silicate catalyst having a constraint index of 1-12, a Si/Al atomic ratio of at least 1,000, an external surface area of at least 5 m.sup.2 /g, and 5.mu. equivalents/g or less of external acid amount, said cyclohexanone oxime being fed at 1-50 hr.sup.-1 in terms of WHSV.
Dependencies are inferred from the claim text.