Process for the preparation of .epsilon.-caprolactam

Details Process for the preparation of .epsilon.-caprolactam Process for the preparation of .epsilon.-caprolactam

1997-03-19

1999-05-04

Shah, Mukund J.

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

Organic compounds

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

540536, C07D20104

Patent

active

059004827

ABSTRACT:
The present invention provides a method for producing .epsilon.-caprolactam, which comprises subjecting cyclohexene to a hydration reaction to obtain cyclohexanol, subjecting the cyclohexanol to a dehydrogenation reaction to obtain cyclohexanone, subjecting the cyclohexanone to an oxime-forming reaction to obtain cyclohexanone oxime, and subjecting the cyclohexanone oxime to a Beckmann rearrangement reaction to obtain .epsilon.-caprolactam, wherein methylcyclopentanones contained in the cyclohexanone subjected to the oxime-forming reaction are controlled to be not more than 400 ppm.
According to the present invention, it is possible to produce .epsilon.-caprolactam having a quality not inferior to conventional quality at a low cost.

REFERENCES:
patent: 4140685 (1979-02-01), Goettsch et al.
patent: 4457807 (1984-07-01), Rulkens et al.
Patent Abstracts of Japan, JP-8-176102, Jul. 9, 1996.
Patent Abstracts of Japan, JP-8-193061, Jul. 30, 1996.
Patent Abstracts of Japan, JP-8-193062, Jul. 30, 1996.
Patent Abstracts of Japan, JP-8-198845, Aug. 6, 1996.
Patent Abstracts of Japan, JP-5-301858, Nov. 16, 1993.

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