Multicomponent adsorption on activated carbons under supercritical conditions

被引:10
作者
Ustinov, EA
Staudt, R
Do, DD [1 ]
Herbst, A
Harting, R
机构
[1] Univ Queensland, Dept Chem Engn, St Lucia, Qld 4072, Australia
[2] Tech Univ, St Petersburg State Technol Inst, St Petersburg, Russia
[3] Univ Leipzig, Inst Non Class Chem, D-4318 Leipzig, Germany
基金
澳大利亚研究理事会;
关键词
adsorption; mixture; activated carbon; high pressure; equilibria; distribution of adsorption volume;
D O I
10.1016/j.jcis.2004.02.071
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Adsorption of binary mixtures onto activated carbon Norit R1 for the system nitrogen-methane-carbon dioxide was investigated over the pressure range up to 15 MPa. A new model is proposed to describe the experimental data. It is based on the assumption that an activated carbon can be characterized by the distribution function of elements of adsorption volume (EAV) over the solid-fluid potential. This function may be evaluated from pure component isotherms using the equality of the chemical potentials in the adsorbed phase and in the bulk phase for each EAV. In the case of mixture adsorption a simple combining rule is proposed, which allows determining the adsorbed phase density and its composition in the EAV at given pressure and compositions of the bulk phase. The adsorbed concentration of each adsorbate is the integral of its density over the set of EAV. The comparison with experimental data on binary mixtures has shown that the approach works reasonably well. In the case of high-pressure binary mixture adsorption, when only total amount adsorbed was measured, the proposed model allows reliably determining partial amounts of the adsorbed components. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:376 / 385
页数:10
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