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Adsorption separation of CH 4 /CO 2 on mesocarbon microbeads: Experiment and modeling
Author(s) -
Peng Xuan,
Wang Wenchuan,
Xue Ruisheng,
Shen Zengmin
Publication year - 2006
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10723
Subject(s) - adsorption , gravimetric analysis , selectivity , chemistry , porosity , gas separation , chemical engineering , analytical chemistry (journal) , thermodynamics , materials science , chromatography , organic chemistry , catalysis , engineering , physics , biochemistry , membrane
A novel meso‐porous material, the activated mesocarbon microbeads (a‐MCMBs) prepared by this group, is used for the separation of the CH 4 /CO 2 mixture by experiment and modeling. First, the adsorption isotherm of nitrogen at 77K was measured to characterize the a‐MCMBs by the IGA‐003 gravimetric analyzer. Then, the adsorption experiments of pure CH 4 and CO 2 at ambient temperature of 298.15 K were carried out. A CH 4 /CO 2 mixture is prepared at the mole ratio of 85:15, corresponding to the gas composition of the Ya‐13 gas field in the Qiongdongnan basin, China. Although only the total adsorption amount of the gas mixture on a‐MCMBs is available, the single adsorption amount for CH 4 and CO 2 , also including the selectivity of CO 2 over CH 4 , can be obtained by the Zhou, Gasem, and Robinson Equation of State (ZGR EOS). Finally, the adsorption behavior over a wide range of variables was predicted by the ZGR EOS method. The predicted greatest selectivity of CO 2 over CH 4 is 3.70 at 3.0 MPa, 258.15 K for the feed gas mole composition of CH 4 :CO 2 = 40:60. Our results demonstrate that a‐MCMBs is not only suitable for CH 4 storage, but also a promising adsorbent for separation of CH 4 /CO 2 . © 2005 American Institute of Chemical Engineers AIChE J, 2006