An analysis of the equilibrium adsorption of nitrogen, oxygen, and their mixtures on zeolite NaX at temperatures of from −20 to +30°C

Abstract

The equilibrium adsorption of oxygen, nitrogen, and their mixtures on zeolite NaX at temperatures of from −20 to +30°C was analyzed by statistical thermodynamics methods on the basis of the data published by Gorbunov et al. [1]. The regularization method was used to calculate the dependence of the internal energy and entropy of pure gases in zeolite cavities on the number of molecules per cavity. This substantially increased the reliability of the functions found. The heat of sorption as a function of the degree of filling and gas mixture composition was analyzed using the dependences obtained and a new algorithm developed for binary adsorption calculations. The trends revealed can be used to model air separation by pressure swing adsorption.