Applicability of PolyActive™ Thin Film Composite Membranes for CO(2) Separation from C(2)H(4) Containing Multi-Component Gas Mixtures at Pressures up to 30 Bar

The PolyActive™ thin film composite membrane (TFCM) has already been successfully applied for CO(2) separation tasks at feed pressures up to 10 bar. To investigate the applicability at higher pressures, measurements were undertaken with C(2)H(4) containing gas mixtures with a composition comparable to the product stream of the oxidative coupling of methane process, as well as single gases up to a feed pressure of 30 bar. Furthermore, the permeances of the conducted gas mixture experiments were simulated. The results show a strong swelling influence of CO(2) on the used membrane depending on the CO(2) fugacity. This swelling effect leads to a pronounced decrease in selectivity. The observed membrane behavior at high pressures could not be predicted by the Free Volume Model (FVM). Two different simulations were conducted: one based on parameters calculated from single gas data measured at pressures up to 2 bar; and a second based on parameters calculated from single gas data measured at pressures from 2 to 30 bar. The two simulations differ in their prediction accuracy. However, they confirm that it is possible to predict the measured permeances in the pressure range up to an average CO(2) fugacity of 6 bar.