Method of preparing .omega.-lactams, in particular caprolactam
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United States of America Patent
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Mar 3, 1987
Grant Date -
N/A
app pub date -
Mar 27, 1986
filing date -
Mar 27, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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