Method for producing ε-caprolactam

Details Method for producing ε-caprolactam Method for producing ε-caprolactam

2007-03-13

2007-03-13

Kifle, Bruck (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

C540S536000

Reexamination Certificate

active

11088874

ABSTRACT:
The invention provides a method for producing ε-caprolactam comprising the steps of: a reaction process which subjects cyclohexanone oxime to a Beckmann rearrangement reaction in the presence of a solid catalyst; and a catalyst regeneration process which regenerates the solid catalyst used in the reaction process by heat treatment under an atmosphere comprising an oxygen-containing gas, wherein the solid catalyst heat-treated in the catalyst regeneration process is used in the reaction process, the carbon contents in the solid catalyst in the reaction process and the catalyst regeneration process are maintained in a range of 0.5 to 2% by weight, and the nitrogen contents in the solid catalyst in the reaction process and the catalyst regeneration process are maintained in a range of 0.01 to 0.2% by weight.According to the invention, ε-caprolactam can be produced in a high production yield for a long period of time by enhancing persistence of the catalytic activity for producing ε-caprolactam.

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JP 2003236394 (machine translation), Aug. 26, 2003.
English language abstract of JP 2003 236394 A (Aug. 26, 2003).
English language abstract of JP 06 107627 A (Apr. 19, 1994).

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