Membranes for separation of CO2/CH4 at harsh conditions

This review discusses recent advances in the development of materials and membranes with the potential for use in hostile environments and their efficiency in separating CO2 and CH4. Depending on the gas treatment operating condition, the membranes are exposed to harsh conditions (pressures above 40 bar), which is a challenge to ensure performance. Polymeric, inorganic, and mixed matrix membranes have been investigated, and the zeolites (inorganic) have presented advantages in terms of physical and chemical stability, in addition to greater selectivity. However, commercially available membranes for the separation of CO2 and CH4 are mostly polymeric, due to their higher stage of development.