Preparation and characterization of high-spinnability isotropic pitch from 1-methylnaphthalene-extracted low-rank coal by co-carbonization with petroleum residue

Seon Ho Lee, Song Mi Lee, Ui su Im, Sang Do Kim, Seong Ho Yoon, Byung rok Lee, Dong Hyun Peck, Yong Gun Shul, Doo Hwan Jung

Research output: Contribution to journalArticle


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.

Original languageEnglish
Pages (from-to)186-194
Number of pages9
Publication statusPublished - 2019 Dec


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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