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Energies 2010, 3(9), 1576-1585; doi:10.3390/en3091576

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 / Revised: 26 August 2010 / Accepted: 30 August 2010 / Published: 9 September 2010
(This article belongs to the Special Issue Coal, Biomass & Solid Refuse Combustion)
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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 coal hydroliquefaction; residue; hydro-conversion; kinetics; recycle
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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