Process for the synthesis of epsilon-caprolactam
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United States of America Patent
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Dec 6, 1988
Grant Date -
N/A
app pub date -
Mar 7, 1988
filing date -
Mar 11, 1987
priority date (Note) -
Expired
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Abstract
The invention concerns a two-step process for the synthesis of caprolactam by reaction of cylcohexanone-oxime with an excess of oleum, carried out in a first step with only a portion of the oxime and in the presence of liquid SO.sub.2, according to usual 'cold' techniques, the amount of free SO.sub.3 in the oleum being equal to or greater than 50% by weight, wherein said 'cold' step is completed by a second 'hot' step, by adding a second portion of oxime, the ratio between said second portion and said first portion ranging from 0.5 to 1.2.
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