SELECTIVE PREPARATION OF ANISOTROPIC SPHERES FROM COMMERCIAL PITCHES BY CARBONIZATION UNDER VACUUM.

Yang Duk Park, Yozo Korai, Isao Mochida

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Mesophase spheres were selectively prepared from petroleum A240, hydrotreated A240, and coal tar pitches by heat treatment at 430 degree C for 1 h under vacuum (5-10 Torr), the sphere content being as high as 55 vol% in the residual product. Mesophase spheres from A240 and coal tar pitch tended to coalesce as bulk mesophase of irregular shape when heat-treated for the longer time of 3 H. In contrast, spherical shapes of larger diameter were maintained when hydrotreated A240 was heated under the same conditions where the sphere content was 70 vol%. The spheres were separated by pyridine extraction.

Original languageEnglish
Pages (from-to)689-694
Number of pages6
JournalHigh Temperatures - High Pressures
Volume16
Issue number6
Publication statusPublished - 1984

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry
  • Computational Mechanics
  • Mechanics of Materials
  • Materials Science (miscellaneous)

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