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Kinetics of extraction of coal-tar pitch components with supercritical carbon dioxide |
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| Authors: | S Marković Z Marković R I McCrindle B R Simonović |
| Institution: | (1) Faculty of Science, University of Kragujevac, POB 60, 34000 Kragujevac, Serbia;(2) Faculty of Agronomy, University of Kragujevac, 34 Cara Duŝana, 32000 Ĉaĉak, Serbia;(3) Tshwane University of Technology, POB 56208, 0007 Arcadia, Republic of South Africa;(4) Holding Institute of General and Physical Chemistry, 12/V Studentski trg, POB 551, 11000 Belgrade, Serbia |
| Abstract: | The extraction of a coal-tar pitch with supercritical carbon dioxide was performed under optimal pressure, flow rate, and three different constant temperatures. The extraction kinetics was examined for each temperature and it was surprisingly found that the extraction rate of most components was governed by the first-order kinetics. It was assumed that this deviation from typical models of supercritical fluid extraction kinetics was caused by high pitch concentrations and low solubilities of the components. |
| Keywords: | coal-tar pitch supercritical fluid extraction carbon dioxide polycyclic aromatic hydrocarbons kinetics |
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