| 摘要 |
<p>A reverse osmosis membrane (10) with improved physical characteristics which is particularly useful in water purification. This membrane includes a thin, active layer (20) of a relatively inert, film forming, polymer, preferably cellulose triacetate, which is capable of dissolving a limited amount of water. The active layer is used in association with a porous support (12), preferably polyvinylidene fluoride. This active layer is disposed on a hydrogel layer (16) which serves to facilitate the movement of water away from the active layer generally toward the pores in the support. The support used is an asymmetric layer or membrane in which the porosity increases with the distance from the hydrogel layer. The complete membrane may be made by employing solvent solutions which are successively applied to the support layer or membrane and from which the solvent is removed.</p> |
