Consider a binary gas mixture of ethylene and ethane. This Demonstration plots the selectivity for adsorption of ethylene relative to ethane in NaX (zeolite structure FAU or faujasite) at user-set values of the total pressure at . In addition, the total amount and specific amounts of each component adsorbed are plotted as functions of the gas-phase mole fraction of ethylene: total amount in blue, ethylene in magenta, and ethane in brown.