A process for separating carbon dioxide from a multicomponent gas mixture containing carbon dioxide and a hydrocarbon, such as natural gas or associated gas, using gas-separation membranes selective for carbon dioxide over the hydrocarbon. The membranes use a selective layer made from a polymer having...http://www.google.com/patents/US6572680?utm_source=gb-gplus-sharePatent US6572680 - Carbon dioxide gas separation using organic-vapor-resistant membranes
