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Gao R.,The 451st Hospital of Peoples Liberation Army | Sun Z.,Xianyang Normal University | Niu M.,Northwest University, China | Zhao H.,Northwest University, China | And 2 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2015

The influence of asphaltene content in coal tar feedstock which consisted of deasphalted oil in medium and low temperature coal tar mixed with crude asphaltene on the compositions and structures of hydrotreated asphaltenes was studied in an autoclave. The results showed that, with increasing the asphaltene content in the feedstock, the average relative molecular mass and the contents of sulfur, nitrogen and oxygen in the hydrotreated asphaltenes increased, the H/C atomic ratio and condensation degree parameter of the aromatic ring system decreased, but the aromaticity factor of the hydrotreated asphaltene increased, which indicated that the condensation degree of the hydrotreated asphaltene increased and its coking reactivity was enhanced. When the asphaltene content reached 17%(w), both the total ring number and the aromatic ring number in the hydrotreated asphaltene were more than those in the coal tar feedstock, which showed that the condensation reactions were dominating when the asphaltene content in the feedstock was excessively high. © 2015, SINOPEC Beijing Research Institute of Chemical Industry. All right reserved.

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