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US09562008B2 Process for the recovery of ε-caprolactam from extract water 有权
从萃取水中回收ε-己内酰胺的方法

Process for the recovery of ε-caprolactam from extract water
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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