Method for purifying caprolactam
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United States of America Patent
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-
Mar 10, 2009
Grant Date -
May 4, 2006
app pub date -
Nov 11, 2003
filing date -
Nov 13, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The disclosure relates to a process for purifying crude caprolactam. The process involves converting a first mixture of 6-amino capronitrile and water to a second mixture of caprolactam ammonia, water, high boilers and low boilers using a catalyst. The ammonia is removed from the second mixture to obtain a third mixture. Water is removed from the third mixture to give crude caprolactam, high boiler and low boilers. Purified caprolactam is then obtained by a series of distillation steps.
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