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Densities, refractive indices, and viscosities were determined for two ionic liquids, 1-methyl-3-octylimidazolium tetrafluoroborate and 1-methyl-3-butylimidazolium perchlorate, and for their mixtures with ethanol at atmospheric pressure and temperatures from (278.15 to 363.15) K. The results for the pure components were correlated successfully by empirical equations. Excess molar volume, viscosity deviation, and refractive index deviation were calculated and correlated by the Redlich-Kister polynomial equation. As the numbers of parameters for Redlich-Kister polynomial equations are large, a model with one parameter was proposed to calculate densities, viscosities, and refractive indices of binary mixtures. On the basis of the proposed model, the physical properties of binary solutions are calculated from pure component physical properties, their mole fractions, and an adjustable parameter, which is determined by fitting of the experimental data.The results of the model represent reasonable accuracy for physical properties of binary systems.

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Experimental data for adsorption of pure carbon dioxide, methane, and nitrogen on zeolite 13X granules at different temperatures (288.15–318.15 K) and pressure up to 20 bar are reported. The cation of adsorbent is exchanged with H+, Li+, and Cu2+, and the adsorption of pure gases is measured. The equilibrium adsorption isotherms of gases are performed with a static volumetric adsorption instrument, which was designed and built. The results show that the adsorption capacity of carbon dioxide is higher than that of methane and nitrogen and that the cation exchange improved the adsorption capacity of pure gases. The LiX adsorbent has the highest adsorption capacity among the studied adsorbents. However, the relative selectivity of carbon dioxide over methane for zeolite 13X has the highest value of 30.48. The CuX adsorbent shows the highest selectivity for carbon dioxide over nitrogen. The adsorption isotherms for all of the pure gases are fitted successfully with the Toth model.