This book comprehensively and systematically treats modern understanding of the polymeric membrane science and technology. It covers topics like the design concept and the fabrication of polymeric membranes aimed for ultrahigh gas selectivity and permeability, antifouling ability, the membrane structure design theory of the target separation/reaction purpose, the simulation module developed for industrial and nonideal membrane operation, the principles, mechanisms and fabrication strategies of integrated process design and the novel enhanced hybrid process. This book will appeal to a wide general readership including chemists, chemical engineers, materials researchers, pharmaceutical scientists, biomedical researchers, etc.