Method of preparing .omega.-lactams, in particular caprolactam

Details Method of preparing .omega.-lactams, in particular caprolactam Method of preparing .omega.-lactams, in particular caprolactam

1986-03-27

1987-03-03

Bond, Robert T.

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

Organic compounds

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

540464, 546243, 548554, C07D20110

Patent

active

046476610

ABSTRACT:
A method of preparing .omega.-lactams, in particular caprolactam, comprising: a step of premixing cycloaliphatic acids having the formula ##STR1## where n=3-13, with a dehydrating agent; the first step of reaction with a nitrosating agent; the second step of reaction with the addition of a very small amount of water corresponding to a molar ratio U=H.sub.2 O/SO.sub.3 within the 0.1 to 0.9 range; and the step of reclaiming the unreacted cycloaliphatic acid. The method affords improved output from the lactamization reaction and reduced byproducts.

REFERENCES:
patent: 3022291 (1962-02-01), Muench et al.
patent: 4349437 (1982-09-01), Rossi et al.

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