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A Study on the Hydrotreating of Coal Hydroliquefaction Residue and its Kinetics
Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, shanghai, China
* Author to whom correspondence should be addressed.
Received: 19 August 2010; in revised form: 26 August 2010 / Accepted: 30 August 2010 / Published: 9 September 2010
Abstract: Hydro-conversion of coal hydroliquefaction residue obtained from a 6t/day pilot plant of Shenhua Group in Shanghai was carried out under the hydrotreating condition. The coal hydroliquefaction residue and its product were extracted in sequence with n-hexane, toluene and tetrahydrofuran in a Soxhlet apparatus. The n-hexane soluble fractions increased with the increase of reaction temperature and time. Its amount increased from 14.14% to a maximum of 40.86% under the conditions of 470 °C and 30 min, which meant that moderate extension of coal residence time in the coal hydroliquefaction reactor is beneficial to the increase of oil yield. A 4-lumped kinetic model of coal hydroliquefaction residue hydro-conversion was performed using solubility-based lumped fractions. In the model, the tetrahydrofuran insoluble fractions were classified into two parts: easily reactive part and unreactive part. The kinetic parameters were estimated by a fourth-order Runge-Kutta method and a nonlinear least squares method, and the apparent activation energies were calculated according to the Arrhenius Equation. A large quantity of total catalyst consisting of remained liquefaction catalyst, part of the mineral from raw coal and additive Fe-based catalyst could considerably reduce the apparent activation energy of hydro-conversion for the toluene insoluble/tetrahydrofuran insoluble fractions to 36.79 kJ•mol-1. The calculated values of the model coincided well with the experimental values.
Keywords: coal hydroliquefaction; residue; hydro-conversion; kinetics; recycle
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Huang, J.; Lu, X.; Zhang, D.; Gao, J. A Study on the Hydrotreating of Coal Hydroliquefaction Residue and its Kinetics. Energies 2010, 3, 1576-1585.
Huang J, Lu X, Zhang D, Gao J. A Study on the Hydrotreating of Coal Hydroliquefaction Residue and its Kinetics. Energies. 2010; 3(9):1576-1585.
Huang, Jue; Lu, Xilan; Zhang, Dexiang; Gao, Jinsheng. 2010. "A Study on the Hydrotreating of Coal Hydroliquefaction Residue and its Kinetics." Energies 3, no. 9: 1576-1585.