Demonstrating the Relationship Between Permeability and Selectivity in Ionically Conductive Membranes for Gas Separation
Hodge, Nathaniel Scott
MetadataShow full item record
Gas separation is an increasingly important process in the modern industrial world. One particularly relevant separation is the removal of CO2 from raw natural gas. Natural gas releases less CO2 during combustion than oil or coal and produces fewer pollutants. Current technology for separating CO2 from raw natural gas requires high capital investment and large energy demands, limiting its economic benefits. Membrane-based gas separation has the potential to become a low-cost, energy-efficient method. However, porous membranes have demonstrated a tradeoff between the flux of gas through the membrane and the selectivity of the desired gas. Mainstream Engineering has developed pore-free ionically conductive membranes that operate via facilitated transport of the target gas. When used in a membrane electrode assembly (MEA) inside an electrochemical cell, these membranes demonstrate the ability to filter gases with high selectivity. The rate and selectivity of these membranes at atmospheric conditions were evaluated using a gas chromatography unit and mass flow controllers. Several of the materials tested in this study displayed potential for industrial application.