Pervaporation
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Pervaporation is a method for the separation of mixtures of liquids by partial vaporization through a non-porous membrane.
The membrane acts as a selective barrier between the two phases, the liquid phase feed and the vapor phase permeate. It allows the desired component(s) of the liquid feed to transfer through it by vaporization. The fractionation process is mainly due to polarity differences, and not to the volatility difference of the components in the feed. The word is derived from the two basic steps of the process, firstly the permeation through the membrane by the permeate, then it's evaporation into the vapour phase. This process is used by a number of industries for several different processes due to its simplicity and in-line nature.pl:Perwaporacja