K&M was engaged by US DOE to evaluate the potential performance and economics of membrane technologies for high temperature gas separations in three gasification system schemes. A systems approach using computer modeling compared the performance of these new technologies with baseline performance of existing processes. The new membrane-based separation technologies considered include those whose process steps include separation of H2 and CO2 gases, removal of contaminant gases such as H2S and NH3 and those that deal with other contaminates as indicated in the Clean Air Act of 1990. Research focused on ceramic, glass and metal membranes, with particular emphasis on flux and separation factors achieved by various types of membranes at moderate and high temperatures.