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    • 12. 发明授权
    • Recovery of caprolactam from oligomers and/or polymers of caprolactam
    • 从己内酰胺的低聚物和/或聚合物中回收己内酰胺
    • US5700358A
    • 1997-12-23
    • US396623
    • 1995-03-01
    • Hugo FuchsJosef RitzGerald Neubauer
    • Hugo FuchsJosef RitzGerald Neubauer
    • C07D201/12C07D201/16C08G69/14C08G69/46B01D3/34
    • C07D201/12C07D201/16
    • Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained in the cleavage, by a process including (a) cleaving oligomers and/or polymers of caprolactam to obtain an aqueous reaction mixture which contains caprolactam, (b) removing water from the reaction mixture obtained under (a) to obtain a residue, (c) distilling the residue obtained under (b) in an acidic medium and (d) then distilling the distillate in an alkaline medium to obtain caprolactam, or (c') distilling the residue obtained under (b) in an alkaline medium and (d') then distilling the distillate in an acidic medium to obtain caprolactam.
    • 通过裂解己内酰胺的低聚物和/或聚己内酯并随后通过蒸馏在切割中获得的己内酰胺来处理己内酰胺从己内酰胺的低聚物和/或聚合物中回收己内酰胺,方法包括(a)裂解己内酰胺的低聚物和/或聚合物 得到含有己内酰胺的水性反应混合物,(b)从(a)得到的反应混合物中除去水,得到残渣,(c)将酸性介质中的(b)得到的残渣蒸馏,然后蒸馏 在碱性介质中的馏出物得到己内酰胺,或(c')将在(b)获得的残余物在碱性介质中蒸馏,然后(d'),然后在酸性介质中蒸馏出馏出物,得到己内酰胺。