Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Recycling of Crosslinked Polypropylene and Crosslinked Polyethylene in Supercritical Methanol

초임계 메탄올에서 가교폴리프로필렌과 가교폴리에틸렌의 재활용성 비교

  • Lee, Hong-Shik (School of Chemical and Biological Engineering, Seoul National University) ;
  • Jeong, Ju Hyeong (School of Chemical and Biological Engineering, Seoul National University) ;
  • Hong, Soon Man (Korea Institute of Science and Technology) ;
  • Koo, Chong Min (Korea Institute of Science and Technology) ;
  • Cho, Hang-Kyu (Korea Institute of Science and Technology) ;
  • Lee, Youn-Woo (School of Chemical and Biological Engineering, Seoul National University)
  • Received : 2011.04.25
  • Accepted : 2011.07.13
  • Published : 2012.02.01
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Abstract

Decrosslinking of crosslinked polypropylene(XLPP) in supercritical methanol was investigated compared with that of crosslinked polyethylene(XLPE). Effect of reaction temperature and initial gel contents was studied using a batch reactor. Gel contents of samples before and after reaction were measured for quantitative analysis. As reaction temperature and initial gel contents increased, the decrosslinking rate increased. The rate of decrosslinking reaction is dependent linearly on the gel contents. Experimental results indicated that the decrosslinking of XLPP was faster than that of XLPE, and it was confirmed quantitatively by the calculation of kinetic constants. In conclusion, it is considered that XLPP has better recyclability than XLPE.

초임계 메탄올에서 가교폴리프로필렌의 탈가교 반응에 대해 연구하고 이를 가교폴리에틸렌의 탈가교 반응과 비교하였다. 회분식 반응기를 이용하여 반응 온도와 초기 겔 함량이 탈가교 반응 속도에 미치는 영향을 알아보았고, 정량적 분석을 위해 반응 전후의 겔 함량을 측정하였다. 반응 온도가 증가할수록, 초기 겔 함량이 증가할수록 탈가교 반응속도가 증가하였고, 반응 속도는 겔 함량에 선형적으로 의존하였다. 가교폴리프로필렌의 탈가교 반응이 가교폴리에틸렌보다 빠르게 일어나는 것을 확인하였고, 반응속도상수를 계산하여 이를 정량적으로 확인하였다. 이를 통해 재활용 측면에서는 가교폴리프로필렌이 가교폴리에틸렌보다 우수한 것을 알 수 있다.

Keywords

Acknowledgement

Supported by : 교육과학기술부

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