Abstract
The structure and carbonization behavior of hexane soluble, asphaltene (TS/HI), and toluene insoluble fractions separated from the pitches from the products of gas-coking coal hydrogenation performed at 420°C and 455°C were estimated. The fractions were characterized by elemental analysis and 1H NMR spectroscopy. The kinetics and mechanism of mesophase formation on isothermal treatment at 450°C and the optical texture of resultant semi-cokes were studied by polarized-light optical microscopy to evaluate the contribution of various components to the pitch transformation. The hydrogenation temperature rise appeared to decrease hetero-atom content and increase aromaticity in all fractions, improving essentially their carbonization behavior. The extent of the alteration increased with the fraction depth. Asphaltenes showed the most extensive mesophase development among all fractions. The properties of this component seemed to have a decisive effect on the transformation of pitch as a whole. Toluene insolubles from the low-temperature hydrogenation, conversely to those produced at 455°C, contributed to some deterioration of the optical texture of pitch coke.
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