| 摘要 |
<p>A method for preparing a hollow membrane for mass transfer between a liquid phase and a gaseous phase, comprising: preparing a polymeric paste obtained by mixing from 13 to 39% of a polymer belonging to the class of polysulphones with a polar aprotic solvent. The blend is extruded from an annular opening of an annular section extruder head with concomitant injection from the extruder head of a precipitant solution into the forming hollow membrane. The precipitant solution consists of 5 - 55% by weight of a polar aprotic solvent and of 45 - 95% by weight of a solvent selected from the group consisting of acetone, methylethylketone, glycerol, water, ethylene glycol, ethanol, butanol and isopropyl alcohol.</p> |
