A simple technique is described for calculating adsorption equilibria for components in a gaseous mixture, using only data for the corresponding pure-component adsorption equilibria on the same adsorbent. By using experimental data for the binary mixture, the activity coefficient is calculated, also.
The proposed technique is based on the ideal solution theory, where Raoult's Law applies. Predicted adsorption equilibria for Ethane-Ethylene mixtures at 20 ℃ and 60 ℃ gave excellent agreement, but an Ethylene-Carbon dioxide mixture showed some non-idealities, which were expected because of the chemical dissimilarities.
The simplicity of the calculation, which requires no data for the mixture, makes it useful for engineering application to non-polar and chemically similar gas mixtures.