各種ダイナミック膜および無機材質膜とその応用

概要

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Dynamic membrane can be formed by filtering a feed solution containing a membrane forming material through a porous support. The principle of this membrane was first reported in 1966 with hydrous Th (IV) as a membrane forming additive. Since then, in making of RO or UF membranes, most of the research and development studies on dynamic membranes has been concentrated on searching membrane forming additives and on determining optimum formation processes. We classify dynamic membranes into two types, a pre-coat type and a self-rejecting type. The pre-coat type is a normal dynamic membrane for RO or UF membrane previously descried. In the self-rejecting type, the depositl ayer, composed of macromolecular solute such as synthetic polyelectrolyts or protein, has a ultra-filtration, ability for the solute. The development and current research of these dynamic membranes is to be reviewed.<BR>Although many studies of the dynamic membranes were conducted with ceramics, stainless steel and carbon tubes as porous supports, pore sizes of supports were widely distributed. But, along with the advancement in materials development, the pore size and its distribution have become small and narrow, respectively. Today, the porous support, especially made of ceramics and glass, can be used as inorganic MF or UF membrane. These inorganic membranes will also be reviewed briefly.
日本膜学会の論文