Surface area variations of coal during solvent extraction |
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| Authors: | David Medeiros Eugene E. Petersen |
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| Affiliation: | Department of Chemical Engineering and Energy and Environment Division, Laurence Berkeley Laboratory, University of California, Berkeley, CA 94720, USA |
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| Abstract: | Changes in the surface area of a Wyoming sub-bituminous coal with progressive extraction have been investigated. Surface areas were determined from CO2 adsorption isotherms at 196 K using the BET equation with 0.234 nm2 for the molecular cross-sectional area of the CO2 molecule at 196 K. Surface areas of the extracted coal varied with extraction time, yield and with the nature of the solvent. A maximum surface area of 265 m2/g was obtained from a four-hour treatment using tetralin at 350 °C as the solvent. The raw coal had a surface area of 99 m2/g. |
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