Coal extract produced by solvent extraction of low-rank coal is not suitable for spinning due to its high oxygen content. In order to effectively overcome this limitation, soft pitch was produced by co-carbonization of coal extract and petroleum residues. The decrease in oxygen content was confirmed by physical property analyses of the soft pitches blended at different mixing ratios. A bridge/hydroaromatic structure of the soft pitch was observed during the co-carbonization. The produced spinnable pitch had a high spinnability and a softening point of 230 °C. This spinnable pitch, prepared by solvent extraction of low-rank coal, showed excellent spinnability and was heat-treated at 800 °C for 5 min to produce isotropic carbon fibers having diameters of 7 μm and a tensile strength of 1189 MPa. Thus, the co-carbonization of coal extract and petroleum residue is an effective method for the production of inexpensive spinnable pitch for isotropic carbon-fiber manufacture.
Bibliographical noteFunding Information:
This work was supported by Nano-Convergence Foundation ( www.nanotech2020.org ) funded by the Ministry of Science and ICT(MSIT, Korea) & the Ministry of Trade, Industry and Energy (MOTIE, Korea) [Project Name: Development of a thin CNT reinforced carbon composite having designed special flow patten with high mechanical, electrical properties and corrosion resistance/Project Number: R201901010 ], This work was conducted under framework of the research and development program of the Korea Institute of Energy Research (KIER) ( B5-2427 ) in Republic of Korea.
© 2019 Elsevier Ltd
All Science Journal Classification (ASJC) codes
- Materials Science(all)