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The Characteristics of Mesophase Pitch Prepared by Heterogeneous Fluorination Process from Pyrolysis Fuel Oil

열분해잔사유로부터 불균일계 불소화공정에 의해 제조된 메조페이스 피치의 특성

  • Kim, Do Young (Department of Chemical engineering and Applied Chemistry, Chungnam National University) ;
  • Kim, Ji-Hyun (Department of Chemical engineering and Applied Chemistry, Chungnam National University) ;
  • Lee, Hyung-Ik (The 4th R&D Institute-4, Agency for Defense Development) ;
  • Lee, Young-Seak (Department of Chemical engineering and Applied Chemistry, Chungnam National University)
  • 김도영 (충남대학교 응용화학공학과) ;
  • 김지현 (충남대학교 응용화학공학과) ;
  • 이형익 (국방과학연구소 제4연구본부) ;
  • 이영석 (충남대학교 응용화학공학과)
  • Received : 2016.09.13
  • Accepted : 2016.09.24
  • Published : 2016.10.10

Abstract

In this study, we have prepared mesophase pitch from pyrolysis fuel oil (PFO) by heterogeneous reforming process. This process was conducted by direct fluorination at various temperature and followed by the heat treatment at $390^{\circ}C$. The reformed pitch was then investigated by softening point analysis, elemental analysis, fourier-transform infrared spectroscopy, high resolution X-ray diffraction and polarization microscope analysis. Carbon contents of reformed pitch increased according to increasing the reaction temperature of fluorination, while oxygen, nitrogen and sulfur contents were completely eliminated. As the fluorination temperature increased, the creation, growth, coalescence and alignment process of mesophase spheres were observed. Also the interlayer spacing of carbon hexagonal planar structure decreased, while its crystalline size increased. In addition, aromatic ring compound contents increased by the condensation polymerization of aliphatic compound. These results can be attributed to the radical reactivity of the fluorine increased as the reaction temperature increased. It was considered that the fluorination reaction could help PFO to generate aromatic compounds, via promoting polymerization by radical reaction.

Acknowledgement

Supported by : 국방과학연구소

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