Process for the recovery of ε-caprolactam from extract water
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United States of America Patent
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Feb 7, 2017
Grant Date -
Aug 4, 2016
app pub date -
Jul 7, 2014
filing date -
Jul 9, 2013
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Abstract
A process for the recovery of ε-caprolactam from extract water of polycaprolactam obtained by hydrolytic polymerization, wherein the extract water is concentrated, subsequently contained oligomers are depolymerized, non-depolymerizable impurities are separated, water and low-boiling impurities are removed, wherein for adjusting the purity of the recovered ε-caprolactam and the energy consumption used for the process a part of the product is removed from the process as intermediate products.
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