| 摘要 |
In a process comprising diffusing a fluid through the upstream side of a semipermeable membrane having upstream and downstream sides, to the downstream side, the improvement comprising exposing the downstream side during said diffusing to either a liquid which does not wet the downstream side, or to the vapor of said liquid, whereby the rate of diffusion of said fluid through said membrane is increased and wherein said semipermeable membrane is a microporous sintered material, e.g., polytetrafluoroethylene having a pore diameter of 1-1,000, preferably 5-200 microns.
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