Abstract
AbstractIn this work, polybenzimidazole (PBI)‐based mixed matrix membranes (MMMs) with natural zeolite were prepared and their transport properties for binary (N2/CH4) and ternary (CO2/N2/CH4) mixed‐gas separation were studied. The MMMs, were prepared with PBI as polymeric matrix and Mexican natural zeolite clinoptilolite enriched with cations of Ca2+ as filler. The thermal properties analysis of the PBI and MMMs studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) indicates that the MMMs membranes have Tg higher than 350°C and decomposition temperatures above 600°C compared with the pristine membranes. PBI membrane and MMMs were analyzed by X‐Ray Diffraction (XRD) and the diffraction patterns showed the zeolite signals combine with the amorphous dome from the polymeric matrix. In addition, the perm‐selectivity properties of the polymeric membranes and MMMs were tested with binary (N2/CH4; 10/90 mol%) and ternary (CO2/N2/CH4; 5/10/85 mol%) gas mixtures at different pressure rates (50, 150 and 300 psi). The perm‐selectivity properties of the MMMs membranes show an improvement in their values about 30% higher compared to the PBI polymeric membranes, favoring the permeation of CO2 and N2.
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