Adsorption kinetics of CO<sub>2</sub>, CH<sub>4</sub>, and their equimolar mixture on coal from the Black Warrior Basin, West-Central Alabama

Gruszkiewicz, M. S.; Naney, M. T.; Blencoe, J. G.; Cole, D. R.; Pashin, J. C.; Carroll, R. E.

Abstract:

Laboratory experiments were conducted to investigate the adsorption kinetic behavior of pure and mixed gases (CO_2, CH₄, approximately equimolar CO₂ + CH₄ mixtures, and He) on a coal sample obtained from the Black Warrior Basin at the Littleton Mine (Twin Pine Coal Company), Jefferson County, west-central Alabama. The sample was from the Mary Lee coal zone of the Pottsville Formation (Lower Pennsylvanian). Experiments with three size fractions (45-150????m, 1-2??mm, and 5-10??mm) of crushed coal were performed at 40????C and 35????C over a pressure range of 1.4-6.9??MPa to simulate coalbed methane reservoir conditions in the Black Warrior Basin and provide data relevant for enhanced coalbed methane recovery operations. The following key observations were made: (1) CO₂ adsorption on both dry and water-saturated coal is much more rapid than CH₄ adsorption; (2) water saturation decreases the rates of CO₂ and CH₄ adsorption on coal surfaces, but it appears to have minimal effects on the final magnitude of CO₂ or CH₄ adsorption if the coal is not previously exposed to CO₂; (3) retention of adsorbed CO₂ on coal surfaces is significant even with extreme pressure cycling; and (4) adsorption is significantly faster for the 45-150????m size fraction compared to the two coarser fractions. ?? 2008 Elsevier B.V.

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Article

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70035801

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Gruszkiewicz, M. S.; Naney, M. T.; Blencoe, J. G.; Cole, D. R.; Pashin, J. C.; Carroll, R. E.

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1-2

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English

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International Journal of Coal Geology

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Adsorption kinetics of CO₂, CH₄, and their equimolar mixture on coal from the Black Warrior Basin, West-Central Alabama; 2009; Article; Journal; International Journal of Coal Geology; Gruszkiewicz, M. S.; Naney, M. T.; Blencoe, J. G.; Cole, D. R.; Pashin, J. C.; Carroll, R. E.