| 摘要 |
<p>A semi-permeable gas membrane process is described for the separation of very high purity nitrogen (17) from a process feed gas mixture (11) that is predominantly nitrogen, and one or more other permeable gases, which process comprises providing the feed gas mixture (11) under pressure to a membrane separator unit (14) comprising a semi-permeable separation membrane (16) with respect to which the largest fraction of the other permeable gases is at least 20 times more permeable than nitrogen, to provide a very high purity raffinate nitrogen gas product (17).</p> |
