Abstract
The capture of carbon dioxide (CO2) from sour gas streams with polymeric membranes is of great importance due to the low cost of polymeric membranes, compact, high area per unit volume, and ease of operation compared to packed bed towers. Packed bed towers have been comprehensively employed in various areas such as gas separation processes. Gas absorption in packed towers has been approved as a successful technology in chemical and other industrial processes using scrubbing liquid. By contrast, there are weaknesses in the performance of packed bed columns; for example, the high flow rates might lead to flooding, and the low liquid flow rates might lead to poor distribution of liquid foaming. The packed bed columns have a small specific gas-liquid interfacial area compared to polymeric membranes. Moreover, a comparatively large size of packed columns is required compared to the gas-liquid membrane contactor. Membrane contacting systems for gas separation have been of great interest to several investigators as a substitute technology due to their large specific gas-liquid interfacial contact area. This chapter delivers the importance of polymeric membranes employed in CO2 gas separation. Membranes structure and method of fabrication have a strong impact on membrane performance. The chapter seeks to highlight the potential use of polymeric membranes for CO2 separation.
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