Process for purifying lactams
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United States of America Patent
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Sep 18, 2007
Grant Date -
Aug 21, 2003
app pub date -
Dec 27, 2000
filing date -
Dec 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is described for purifying lactams, in particular the lactams obtained by cyclizing hydrolysis of an aminoalkylnitrile, and more particularly to the purification by crystallization of .epsilon.-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile. This crystallization is carried out on the cyclization reaction medium after hydrogenation, removal of volatile compounds, and treatment with an ion-exchange resin.
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