Catalytic carbonization of aromatic hydrocarbons—IX: Carbonization mechanism of heterocyclic sulfur compounds leading to the anisotropic coke

✍ Scribed by Isao Mochida; Takashi Ando; Keiko Maeda; Hiroshi Fujitsu; Kenjiro Takeshita

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Volume: 18
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(80)90021-4

✦ Synopsis

Carbonization mechanisms of three heterocyciic sulfur compounds catalyzed by aluminium chloride were investigated in order to resolve the factors which influence the optical texture of the coke produced from these compounds. The extent and rate of sulfur elimination, the rate of carbonization as measured by the increase of benzene insolubles, the temperature region of fusion, and the intermediate structure were assumed influential during the carbonization. Thioxanthene, which produced a mosaic coke, showed a similar fused region to that of diphenylene sulfide which formed a needle coke. however the rate of carbonization of the former compound was much faster than that of the latter. Thianthrene. which produced a fine mosaic coke with some isotropic portions, had the narrowest region of fusion. The importance of the intermediate structure in understanding the carbonization me~hanisn3s of the compounds in modifying the carbonization reaction is emphasized. The desulfurization mechanism is also discussed to some extent, relating it to that of carbonization,