发明名称 METHOD OF MANUFACTURING EPSILON-CAPROLACTAM
摘要 An epsilon-caprolactam manufacturing method capable of manufacturing in good yield, high-quality epsilon-caprolactam containing less impurity has an epsilon-caprolactam purification step A of obtaining purified epsilon-caprolactam from raw epsilon-caprolactam by applying a drop crystallization method, a first-stage epsilon-caprolactam recovery step B of obtaining first recovered epsilon-caprolactam and a first recovered mother liquor by applying an evaporative crystallization method to a crystallization mother liquor obtained in the epsilon-caprolactam purification step A, and a second-stage epsilon-caprolactam recovery step C of obtaining second recovered purified epsilon-caprolactam by applying a melt crystallization method to the first recovered mother liquor, first recovered epsilon-caprolactam being recovered as a raw material for the epsilon-caprolactam purification step A and second recovered purified epsilon-caprolactam being recovered as a raw material for the epsilon-caprolactam purification step A and/or the first-stage epsilon-caprolactam recovery step B.
申请公布号 US2012330006(A1) 申请公布日期 2012.12.27
申请号 US201113581777 申请日期 2011.03.01
申请人 NAGAMI HIDETO 发明人 NAGAMI HIDETO
分类号 C07D201/16 主分类号 C07D201/16
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