Process for producing epsilon-caprolactam
AssigneeSumitomo Chemical Company, Limited
InventorsHiroshi Sato, Kenichi Hirose, Masaru Kitamura, Hideto Tojima, Norio Ishii
Life of this patent
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Abstract
.epsilon.-caprolactam is prepared by gas phase catalytic synthesis where cyclohexanone oxime is brought into contact with a crystalline zeolite, for example, aluminosilicate zeolite or metallosilicate zeolite having a constraint index of 1-12 which has been surface treated with an organometallic compound represented by the general formula: R.sub.4-n MX.sub.n wherein R which may be identical or different represent an alkyl group of 1-6 carbon atoms or phenyl group, M represnets Si or Ge, X represents Cl or an alkoxy group of 1-6 carbon atoms and n represents 1 or 2.
Claims9
A method for preparing .epsilon.-caprolactam which comprises bringing cyclohexanone oxime in a gaseous phase into contact with a crystalline zeolite catalyst having a constraint index of 1-12 which has been surface treated with an organometallic compound represented by the following general formula (I):
- R.sub.4-n MX.sub.n (I)
- wherein R which may be identical or different represent an alkyl group of 1-6 carbon atoms or phenyl group, M represents Si or Ge, X represents Cl or an alkoxy group of 1-6 carbon atoms and n represents 1 or 2.
Dependencies are inferred from the claim text.