In this study, we tried to prepare an isotropic spinnable pitch which can be useful to prepare the general purpose carbon fiber through the co-carbonization of biomass tar with ethylene bottom oil under two different preparation methods (atmospheric distillation, pressurized distillation). The results showed that the ethylene bottom oil added co-carbonization was very effective to decrease of the oxygen contents for obtaining a stable spinnable pitch. The pressurized distillation was more effective to reduce the oxygen functional groups of pitches than atmospheric distillation. The obtained spinnable pitch by the pressurized distillation showed higher pitch yield of 42% and lower oxygen content of 9.12% than the spinnable pitch by the atmospheric distillation. The carbon fiber derived from the pressurized distillation spinnable pitch by carbonization at 800ºC for 5 min showed that the higher tensile strength of carbon fiber was increased up to 800 MPa.

Abstract
 1. Introduction
 2. Experimental
  2.1. Materials
  2.2. Preparation of spinnable isotropic pitchesand carbon fibers
  2.3. Characterization of pitches and carbonfibers
 3. Results and Discussion
  3.1. Analysis of raw materials
  3.2. Preparation and characterization ofpitches
  3.3. Preparation and characterization of carbonfibers
 4. Conclusions
 Conflict of Interest
 Acknowledgements
 References

• Jianxiao Yang(College of Materials Science and Engineering, Hunan University, Institute for Materials Chemistry and Engineering, Kyushu University) Corresponding Author
• Kui Shi(College of Materials Science and Engineering, Hunan University)
• Xuanke Li(College of Materials Science and Engineering, Hunan University)
• Seong-Ho Yoon(Institute for Materials Chemistry and Engineering, Kyushu University)