Adsorption equilibria of light hydrocarbon carbon dioxide mixtures on zeolite 5A using the two-dimensional equations of state

Accurate description of adsorption equilibria of gases an adsorbents is essentially required in the design of gas adsorption separation processes. The equilibrium isotherms were measured using the conventional volumetric method for the adsorption of pure light hydrocarbon gases (methane, ethane and propane) and their mixtures with carbon dioxide on zeolite 5A at 273.2, 303.2 and 323.2 K. Various forms of the two-dimensional equations of state (2-D EOS) were used to describe the adsorption equilibria between the adsorbed and gas phases. Model constants for the 2-D EOS were evaluated for each pure component and binary mixture system, respectively, by correlating with the experimental data. Extensive statistical analyses were performed for calculations of pure component and binary mixture isotherms. The 2-D EOS models were found to be capable of fairly representing adsorption equilibria.