| http://www.w3.org/ns/prov#value | - In drying operations in which water or any impurity of a highly permeable nature is to be separated from air or other feed gas stream, it is also common practice to pass a dry or impurity-free gas on the lower pressure permeate side of the membrane as a purge gas to facilitate the maintaining of a partial pressure differential, and resulting permeation driving force, across the membrane.
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