Title:
【発明の名称】ナイロンを含む廃棄物からカプロラクタムを回収する方法
Document Type and Number:
Japanese Patent JPH11508913
Kind Code:
A
Abstract:
A process for depolymerizing nylon 6 and recovering caprolactam from the depolymerized products by extraction with alkyl phenolic compounds. Process steps include (a) treating a first mixture comprising nylon 6 with water at a temperature between about 200 DEG C. and about 400 DEG C. to yield a second mixture comprising depolymerized nylon 6 components, wherein the second mixture contains caprolactam at a concentration between about 5 wt. % and about 35 wt. %; (b) optionally, separating insoluble material from the second mixture; (c) extracting the second mixture with an extraction agent to yield an aqueous raffinate third mixture and an organic phase fourth mixture comprising caprolactam and the extraction agent, wherein the extraction agent is an alkyl phenol having a boiling point higher than that of the caprolactam; (d) recovering caprolactam from the organic phase fourth mixture by distillation; (e) recycling the aqueous raffinate third mixture to step (a).
Inventors:
Frentzen, Yvonne, Geleen
Tierlt, Marcelinus, Prehelms, Gerhardas
Tuvalu, Rudolph, Lambertus
Tierlt, Marcelinus, Prehelms, Gerhardas
Tuvalu, Rudolph, Lambertus
Application Number:
JP50570597A
Publication Date:
August 03, 1999
Filing Date:
July 11, 1996
Export Citation:
Assignee:
DSM N.V.
International Classes:
C07D201/12; C07D201/16; (IPC1-7): C07D201/12; C07D201/16
Attorney, Agent or Firm:
Mitsuo Matsui