Preparation of mesophase pitch from aromatic hydrocarbons by the aid of HF BF3

Isao Mochida, Kiyoyuki Shimizu, Yozo Korai, Hiroyuki Otsuka, Yukio Sakai, Susumu Fujiyama

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143 Citations (Scopus)

Abstract

Two procedures to prepare mesophase pitch from naphthalene using HF BF3, are described. The first procedure heats naphthalene at 80°C with HF BF3 to give a naphthene rich pitch followed by either (a) heat treatment at 400-480°C under vacuum (0.1 kPa) or (b) Heat treatment at 2.1 MPa followed by vacuum treatment at 0.1 kPa. Approach (a) gives a spinnable mesophase pitch of S.P. 228°C of 98% anisotropy, 23 wt% yield, and approach (b) of 40-60 wt% yield. Stabilization in air was very slow especially with the pitch made by approach (b), taking 90-120 min or longer at 300°C. Programmed heating was effective to reduce the stabilization time. The second procedure heated naphthalene with HF BF3, under pressure at 260-300°C. The resultant pitches had 100% anisotropy and S.P. of 215-285°C with BS amounts of 52-12 wt% in yields of up to 60 wt%. Smoothly spun fibers were stabilized, 15-30 min at 270°C. Noncatalytic preparation produced mesophase pitch of high aromaticity: catalytic preparations maintained naphthenic hydrogen, the cause of stabilization reactivity. HF BF3 could be removed from the pitch.

Original languageEnglish
Pages (from-to)311-319
Number of pages9
JournalCarbon
Volume28
Issue number2-3
DOIs
Publication statusPublished - 1990

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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    Mochida, I., Shimizu, K., Korai, Y., Otsuka, H., Sakai, Y., & Fujiyama, S. (1990). Preparation of mesophase pitch from aromatic hydrocarbons by the aid of HF BF3. Carbon, 28(2-3), 311-319. https://doi.org/10.1016/0008-6223(90)90005-J