A Study on the Hydrotreating of Coal Hydroliquefaction Residue and its Kinetics

Jue Huang, Xilan Lu, Dexiang Zhang and Jinsheng Gao
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Jue Huang: Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, shanghai, China
Xilan Lu: Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, shanghai, China
Dexiang Zhang: Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, shanghai, China
Jinsheng Gao: Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, shanghai, China

Energies, 2010, vol. 3, issue 9, 1-10

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2010
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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