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MOLECULAR ENGINEERING DESIGN OF THE SAPO-34 AND ZIF-8 MEMBRANES FOR CO2 SEPARATION FROM CH4 and N2 Surendar Reddy Venna October 25h, 2010 The separation of C02 from light gases is a very important environmental and energy issue. The state-of-the-art process for the purification of C02 uses amine adsorption, which is a complex, and costly. Membrane technology is far less expensive and requires less energy consumption. Although polymeric membranes can separate CO2, high pressures plasticize them and decrease their separation ability considerably. Zeolite membranes have significant advantages over traditional polymeric membranes, such as high thermal, mechanical, and chemical stability. Furthermore, the development of superior performance membranes for gas mixture separations requires novel materials with fundamentally different structural, adsorption and transport properties than those of polymers and zeolites. In this respect, zeolitic imidazolate frameworks (ZIFs) a subclass of metal organic frameworks, have emerged as a novel crystalline porous materials which combine highly desirable properties, such as uniform pores and exceptional thermal and chemical stability, making them ideal candidates for molecular separations. This work demonstrates the development of continuous zeolite (SAPO-34) and metal organic framework (ZIF-8) membranes able to separate C02jrom CH4 and N2.

Molecular engineering design of the SAPO-34 and ZIF-8 membranes for CO2 separation from CH4 and N2.