Applications of Titanosilicate Molecular Sieve in Gas Separation

Abstract

Adsorption behavior of nitrogen, argon and oxygen on silver exchanged titanosilicate (Ag-ETS-10) were studied in this work. A low temperature gas chromatographic determination of relatively low concentration argon (<1%) was developed, which was applied to evaluate the production of argon free oxygen by adsorptive air separation on Ag-ETS-10. A lab-scale demonstration shows that Ag-ETS-10 is promising as an adsorbent capable of producing high purity oxygen. A mathematic model base on mass balance proves Ag-ETS-10 bed with enhanced density possesses higher recovery yield of oxygen during adsorptive air separation. Several techniques to enhance the bed density of Ag-ETS-10 were investigated. A lab-scale demonstration was carried to verify the prediction of this correlation. Adsorption behaviors of different hydrocarbons (methane, ethane, ethylene) on ETS-10 at high pressure were studied. Separation of binary mixture (ethylene/ethane, methane/ethane) at high pressure was investigated on ETS-10 through lab-scale demonstration. The bed selectivity was obtained from the demonstration and verified through ideal adsorbed solution theory model. As an alternative, microwave desorption provided a faster heating rate and desorption rate, higher desorption and gas recovery and lower energy consumption compared to conductive heating. Desorption of ethylene/ethane and carbon dioxide/methane mixtures was performed by microwave heating on Na-ETS-10 were investigated.