A study of adsorption equilibria of oxygen, nitrogen and\ud oxygen-nitrogen mixtures on types 4A, 5A, 13X and Na-Mordenite molecular\ud sieve pellets has been made.\ud Pure component isotherms, using a volumetric apparatus, have\ud been measured for each gas on each adsorbent at pressures up to 9 bar\ud and for temperatures of 278.15,293.15 and 303.15 K.\ud Curve fitting of the pure canponent isotherms has been attempted\ud using the kinetic model of Gonzalez and Holland, the vacancy solution\ud model, the statistical thermodynamic model and a mathematical equation\ud similar to the Hill-de Boer model. With the exception of the kinetic\ud model, good curve fitting was obtained.\ud Binary equilibria data have been measured, using a constant\ud volume method, for mixtures of oxygen and nitrogen at pressures of\ud 1.7 and 4.4 bar and at temperatures of 278.15,293.15 and 303.15 K\ud for each of the adsorbents. These results have been presented graphically\ud as equilibrium phase compositions and corresponding total\ud adsorption loadings.\ud The binary experimental equilibria data have been examined\ud against values predicted by mixture models (kinetic model, the extended\ud vacancy solution model, the statistical thermodynamic model, the Cook\ud and Basmadjian model, and the ideal adsorbed solution theory) using\ud regression parameters obtained from the pure component isotherms. The\ud statistical thermodynamic model and the ideal adsorbed solution theory\ud gave the best representation of the experimental data.\ud The activity coefficients of the adsorbed phase for the binary\ud experimental data have been calculated and the results showed no\ud appreciable deviation of the adsorbed phase from ideality.British Council and the University of Gezira (Sudan
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