✦ LIBER ✦

Studies on the early stage of carbonization of petroleum pitch by means of high-temperature 1H-NMR and ESR

✍ Scribed by Kiyoshi Azami; Tetsuro Yokono; Yuzo Sanada; Seiichi Uemura

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 663 KB
Volume: 27
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(89)90121-8

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✦ Synopsis

The early stage of carbonization of petroleum pitches has been studied by in-situ, hightemperature 'H-NMR and ESR techniques. Well-resolved 'H-NMR spectra were found to provide cletailed information about the mesophase formation in the course of pyrolysis. The process of mesophase generation during cooling was clarified by using an ESR spin probe. The nucleation of mesophase embryos in these processes was clearly observed in the both spectra. It was found that the mesophase transformation occurs at nearly the same level of aromatic hydrogen fraction or spin concentration.

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