Study on preparation and thermal polymerization kinetics of hydrogenated pitch
Tetralin was used as an additive to investigate the chemical composition and structural change law of hydrogenated pitches prepared with different additive amounts.The composition and structural change law were further investigated by XRD and FT-IR.The reaction kinetics was calculated using a chain reaction mod-el.The results revealed that tetralin is a good hydrogen donor.The hydrogen/carbon ratio of the pitches in-creased from 0.35 to 0.80 with the 50%additive mass fraction.Furthermore,the presence of large amounts of naphthenic structures or alkyl chains in the hydrogenated pitch hindered the overpolymerization of thick cyclic aromatic hydrocarbon during the liquid-phase carbonation reaction.The conversion rate of the TI-QS compo-nent to the QI component(k2)decreased from 0.061 to 0.035,which was conducive to a slow increase of sys-tem viscosity,resulting in the formation of intermediate-phase asphaltenes with a wide-area structure.
coal tar pitchhydrogenationchemical compositionkinetics
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