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Modelling of solvent extraction of coal Open Access


Other title
solvent extraction
Type of item
Degree grantor
University of Alberta
Author or creator
Figueroa, Diana C
Supervisor and department
de Klerk, Arno (Chemical and Materials Engineering)
Gupta, Rajender (Chemical and Materials Engineering)
Examining committee member and department
de Klerk, Arno (Chemical and Materials Engineering)
Gupta, Rajender (Chemical and Materials Engineering)
Trivedi, Japan (Civil and Environmental Engineering)
Department of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
Master of Science
Degree level
Modelling of solvent extraction was studied using 1,2,3,4–tetrahydronaphtalene (tetralin) and Poplar coal (lignite). A kinetic model was developed taking into account temperature, mass transfer limitations and dominating events (physical or chemical) during coal liquefaction. It was found there is no influence of coal particle size (53 – 1000µm) and coal to solvent ratio (1:2 – 1:8) on the extraction yield. After 15 minutes or longer extraction time, two regions were identified, physical and chemical dissolution. The physical dissolution is dominant at low temperatures and chemical dissolution is dominant at high temperatures. Physical and chemical dissolution were modelled using separate terms. The term for physical dissolution employed a limiting concentration and was of the form C_(s-physical) (1-e^(-k_p t) ). The term for chemical dissolution also included a limiting concentration and was of the form (C_(s-reactive)-C_(s-physical))(1-e^(-k_r t)). The description of chemical dissolution was further refined to predict the coal soluble, coal insoluble and light fraction.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Figueroa Murcia, C., Rivolta Hernández, M., Gupta, R., De Klerk, A., Solvent extraction of coal at low temperature: influence of time and particle size. Prepr. Pap.-Am. Chem. Soc., Div. Fuel Chem., 56:2 (2011) 304-305.

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