| 摘要 |
A continuous process is provided for separating key components from mixed fluids, for example, separating water vapor from air, wherein a mixed fluid feed including a key component, at a preselected initial relatively high pressure is passed through a single or a series of hollow tube(s), the walls of which are selectively permeable to the key components of the mixed feed. At the produce end of the tubes, a portion of the product and/or an external purge fluid is expanded or flashed to a lower pressure than the mixed feed and caused to flow as reflux counter-current along the outside of the tubes toward the feed end. In this manner, a pressure gradient is created across the walls of the permeable tubes to induce permeation. The counter-current reflux flow induces a longitudinal concentration gradient along the walls of the permeable tubes which enhances permeation of key components through the walls of the tubes thereby separating them from the mixed fluid feed.
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