Refining process and refining system of caprolactam

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United States of America Patent

PATENT NO 11459302
SERIAL NO

17208073

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Abstract

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A refining process includes steps of subjecting crude caprolactam to a first evaporative crystallization and a first solid-liquid separation to obtain a first caprolactam crystal and a first crystallization mother liquor; washing the first caprolactam crystal to obtain a second caprolactam crystal; optionally concentrating the first crystallization mother liquor to perform a second evaporative crystallization and a second solid-liquid separation to obtain a third caprolactam crystal and a second crystallization mother liquor; subjecting the third caprolactam crystal to a second washing to obtain a fourth caprolactam; optionally concentrating the second crystallization mother liquor to perform thermostatic crystallization, performing separation to obtain a fifth caprolactam crystal and a third crystallization mother liquor; washing the fifth caprolactam crystal to obtain a sixth caprolactam crystal; and subjecting the second caprolactam crystal to a hydrogenation reaction.

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Patent Owner(s)

  • ZHEJIANG HENGYI PETROCHEMICAL RESEARCH INSTITUTE CO., LTD.

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cheng, Shibiao Zhejiang, CN 4 0
He, Yixuan Zhejiang, CN 3 0
Hu, Xiaokang Zhejiang, CN 5 4
Li, Xi Zhejiang, CN 180 956
Li, Zong Zhejiang, CN 9 55
Ma, Dejia Zhejiang, CN 1 0
Shen, Fei Zhejiang, CN 73 351
Wang, Han Zhejiang, CN 176 1144
Wang, Songlin Zhejiang, CN 9 13
Zhang, Xinping Zhejiang, CN 19 60

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