Development of Ultra Rapid Pressure Swing Adsorption

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In order to apply the pressure swing adsorption (PSA) technologies to a more variety of the area, breakthrough approaches are essential in terms of the development of the compact, high-capacity and energy-efficient PSAs. Development of novel adsorbents, novel configurations and so on have been found in the literature so far to meet the above-mentioned demand. We have developed the ultra rapid PSA having extremely short cycle time in the order of the magnitude of second or shorter, enabling the drastic enhancement of the production capacity.1. Development of piston-driven ultra rapid PSABy employing the oxygen enrichment form the air as a model case, the piston-driven ultra rapid PSA was developed and its basic characteristics were clarified by laboratory-scale experiments and simplified numerical simulations. The PSA operations with the cycle time of one second or shorter were practically possible by introducing suction and exhaust by the up-and-down motion of the piston.2. Application to the carbon dioxide recovery from stack gasThe application of this novel PSA to the recovery of carbon dioxide from stack gases which has been paid attention to in these days. It was found that the development and employment of the hydrophobic zeolite are necessary for this purpose. The hydrophobic zeolite has made it possible to sufficiently remove the carbon dioxide in high moisture conditions.3. Proposal and development of honeycomb zeoliteThe honeycomb zeolite was developed and prepared to derive the high performance of the URPSA,which has much less pressure drop. However, unfortunately it was found that the further technical improvements are needed to achieve the separation performance estimated by the numerical simulations based on a mathematical model.