Kinetics of thermal liquefaction of coal |
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Authors: | Jeevan S Abichandani Yatish T Shah Donald C Cronauer Raffaele G Ruberto |
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Affiliation: | 1. Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA;2. Gulf Research and Development Company, Pittsburgh, PA 15230, USA |
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Abstract: | A model is presented for the kinetic study of the thermal liquefaction of Belle Ayr subbituminous and Burning Star bituminous coals with anthracene oil, hydrogenated anthracene oil and hydrogenated phenanthrene. All experiments were performed in a continuous-feed, stirred tank reactor, at a temperature of 450 °C and a space time of approximately 5 to 55 min. A kinetic model which includes a reaction: coal + oil→more reactive coal, correlates the data reasonably well. This reaction explains the net consumption of anthracene oil during the initial stages of liquefaction. Such a reaction may account for a portion of the swelling of coal at low space times and the sizable increase of viscosity of reaction slurry during these initial stages of liquefaction. It is also observed that the yield of oil increases when solvents of increasing hydrogen donor capacity are used. |
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Keywords: | coal liquefaction chemical kinetics |
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