Semipermeable membrane for separating fluids, process for preparing and using the membrane for microfiltration, distillation and special fabrics

摘要

The present invention relates to a semipermeable membrane for separating fluids, comprising hydrophobic PVDF. The membrane is asymmetrical and is prepared with a succession of steps comprising:a) preparing a solution comprising PVDF and an organic solvent;b) treating this solution to form a preformed membrane;c) evaporating at least part of the solvent contained in the preformed membrane;d) gelifying the preformed membrane in a coagulation bath;e) washing the preformed membrane to extract the solvent.