Depolymerization of polyamide 6 in hydrophilic ionic liquids

• 作者: Akio Kamimura Takuji Kawamoto Yuto Shiramatsu
• 来源期刊: 绿色能源与环境:英文版
• 学科: 工学
• 关键词: CHEMICAL RECYCLING Polyamides CHEMICAL conversion IONIC liquids
• 年，卷（期）: 2019,（2）
• 页码范围: 166-170
• 页数: 5页
• 分类号: TK

摘要

Polyamide 6 underwent an efficient depolymerization in hydrophilic ionic liquids under microwave irradiation at 300℃.The depolymerization completed within 60 min.Caprolactam was readily separated by simple extraction procedure and the ionic liquids were recovered and reused for several times.Addition of catalytic amounts of DMAP(N,N-dimethylaminopyridine)promoted the depolymerization effectively.The present improved procedure provides a method to avoid direct distillation procedure,which consumes energy for the separation of caprolactam from ionic liquids.Although some contamination of ionic liquids was observed,the present procedure provides a new possibility for the use of ionic liquids for plastic chemical recycling from the viewpoint of development of an energy-saving methodology.Use of solubility switchable ionic liquids is also examined to explore a possibility for better separation although depolymerization did not work well.