부산대학교 도서관

Currently when fossil fuel resources are decreasing and environmental protection is increasing, renewable energy sources are exploited more. Biogas (typically a raw mixture composed of methane, carbon dioxide and other minor components) can be one of the options how to replace some fossil fuel consumption. Specifically, upgraded biogas has the same utilization and advantages as natural gas. Upgrading biogas to biomethane is commonly utilized. In this process the most crucial operation is the separation of carbon dioxide (CO2) from biogas, which is carried out by technology based on unit operations like adsorption, absorption or membrane separation. The pressure swing adsorption (PSA) is the most widely used method for the separation of gases. It is a periodic batch process where adsorption is performed at a relatively higher pressure than atmospheric pressure and desorption (regeneration) at lower pressure than atmospheric pressure.