Pitch Thermooxidation in Distillation Reactors

O. A. Konovalov, Yu. S. Amirov, O. Ya. Kozina, and T. P. Nekrasova

OAO Zapadno-Sibirskii Metallurgicheskii Kombinat (ZSMK), Novokuznetsk

Abstract—The thermooxidation of pitch in new distillation reactors is investigated industrially in various condi-
tions. It is found that increasing the temperature of one-time evaporation of tar in the stage-II evaporator of the tar-
distillation department up to 400–405°C increases the proportion of toluene-insoluble materials by 19–21 wt %.
A technology for plasticization and thermoxidation of the pitch in distillation reactors is developed. It is shown
that moving the distillation reactors closer to the tar-distillation department reduces the temperature drop of the
pitch and maintains the temperature in the distillation reactors at 340–370°C, thereby intensifying polycondensa-
tion and polymerization. The influence of the heat-treatment time (up to 6–7 h) on the characteristics of the pitch
is determined.

DOI:10.3103/S1068364X08100062

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