There is a "useful permeance" above which further permeance increases will not lead to faster or more compact processes. The"useful permeance" is system specific but for OSN is around 10 L m~(-2) h~(-1) bar~(-1). Once useful permeance is achieved, further materials innovations that would result in better processes are in the areas of 1. More accurate separations. 2. Better in service lifetime performance (aging, fouling). 3. Improved chemical stability.
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机译：上面有一个“有用的渗透率”，进一步的渗透率不会导致更快或更紧凑的过程。 “有用的渗透率”是特定于系统的，但对于OSN约为10 L m〜（-2）H〜（-1）条〜（-1）。一旦实现了有用的渗透率，就会导致更好的过程的进一步材料创新在1.更准确的分离区域。 2.更好的服务寿命性能（老化，污垢）。 3.改善化学稳定性。
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