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    Effect of Equation of States on High-Pressure Volumetric Measurements of Methane-Coal Sorption Isotherms-Part 1: Volumes of Free Space and Methane Adsorption Isotherms

    Access Status
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    Authors
    Ekundayo, Jamiu
    Rezaee, Reza
    Date
    2019
    Type
    Journal Article
    
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    Citation
    Ekundayo, J.M. and Rezaee, R. 2019. Effect of Equation of States on High-Pressure Volumetric Measurements of Methane-Coal Sorption Isotherms-Part 1: Volumes of Free Space and Methane Adsorption Isotherms. Energy and Fuels. 33 (2): pp. 1029-1036.
    Source Title
    Energy and Fuels
    DOI
    10.1021/acs.energyfuels.8b04016
    ISSN
    0887-0624
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/89573
    Collection
    • Curtin Research Publications
    Abstract

    High-pressure volumetric analysis (HPVA) experiments were carried out using Particulate System's HPVA-II 200 at temperatures of 25 and 40 °C and pressures up to 7 MPa to quantify methane adsorption capacities of a coal sample. Six well-known equations of state (EOSs), namely, Peng-Robinson (PR), Soave-Redlich-Kwonk (SRK) and their volume translated forms (PR-Peneloux and SRK-Peneloux), Soave modified Benedict-Webb-Rubin (SBWR), and Lee-Kesler (LK) were used for data interpretation, and the results were compared with those calculated by the equipment using Z-factors from NIST-refprop software implementation of McCarty and Arp EOS for helium and Setzmann and Wagner EOS for methane. Because of variations in the Z-factors of helium and supercritical methane obtained from the different EOSs, large variations were observed in calculated isotherms and Langmuir parameters with the PR-Peneloux and PR-EOS family showing the largest relative deviations, while SRK-EOS and SRK-Peneloux gave more negative adsorption for each temperature. All the EOSs gave significantly lower density for the adsorbed phase at 40 °C compared to the value at 25 °C. This is consistent with the negative effect of temperature on adsorption.

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