Investigation and Comparison of Zeolites and Zeo-Types for Separation of Light Molecules (CO2, N2, CH4) in Membrane Processes

Membrane processes is one of the latest methods in separation of light molecules. Selection of a proper molecular sieve with high selectivity and permeability in moderate pressure and ambient temperature is the significant point in membrane processes. The objective of this review paper is the study of zeolite and zeo-type molecular sieves for separation of CO2 from natural gas (CH4) as well as separation of CO2 from N2 as the major component of the air, in membrane processes. According to this study, the separation factor of CO2/CH4 and CO2/N2 was investigated and compared for different kinds of of zeolites and zeo-type membranes. The literature survey demonstrated that T and SAPO-34 show the highest separation factor of CO2/N2 and CO2/CH4 separation.