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Single and multicomponent adsorption equilibria of carbon dioxide, nitrogen, carbon monoxide and methane in hydrogen purification processes
Author(s) -
Sievers Werner,
Mersmann Alfons
Publication year - 1994
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270170507
Subject(s) - adsorption , chemistry , carbon monoxide , thermodynamics , methane , ternary operation , activated carbon , hydrogen , pressure swing adsorption , carbon dioxide , atmospheric temperature range , molecular sieve , organic chemistry , catalysis , physics , computer science , programming language
Single, binary, ternary and quaternary adsorption equilibria of CO 2 , CO, CH 4 and N 2 on molecular sieve 5A and activated carbon were experimentally determined over a pressure range from 10 −4 to 10 1 MPa, a temperature range from 303 to 363 K and at various compositions. The adsorption equilibria of steam reformer gases as needed for the hydrogen purification in pressure swing adsorption units were measured by using a circulating volumetric method. For the temperature‐dependent correlation of pure gas isotherm fields the Toth equation, which is a favorable model for heterogeneous adsorbents, was extended by two parameters accounting for the temperature‐dependencies of the saturation loading and the heterogeneity parameter. Multicomponent equilibria were successfully predicted from single component isotherms by the Ideal Adsorbed Solution Theory based on the accurate representation of the pure component data by this temperature dependent Toth equation. Other thermodynamic models like the HIAS, the MIAS, the SPD or the VS theory and the Statistical Thermodynamics Model were also applied to the prediction of the adsorption equilibrium and the temperature and pressure dependence of the selectivity, with comparable success, which is due to the quasi‐ideal adsorption behavior even at a high pressure.