Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate
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United States of America Patent
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Nov 10, 2009
Grant Date -
Jan 20, 2005
app pub date -
Aug 23, 2002
filing date -
Aug 27, 2001
priority date (Note) -
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Abstract
A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the aqueous caprolactam product, in an amount of not more than 100 mmol alkali hydroxide per kg of caprolactam; (b) reacting at least part of the added alkali hydroxide to form alkali amino caproate, to obtain a caproate-enriched caprolactam product; and (c) distilling the caproate-enriched caprolactam product at reduced pressure.
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