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What is Pervaporation?

AZEO-SEP™ (PERVAPORATION & VAPOUR PERMEATION)systems use pervaporation for separation or purification of various liquid mixtures by partial vaporization through a non-porous membrane.

PRINCIPAL OF OPERATION

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 separation process is mainly due to polarity difference and not on the volatility difference of the components in the feed.

LIMITATIONS OF CONVENTIONAL DISTILLATION

Distillation is a conventional fluid mixture separation technology that can separate components with different volatilities and markedly different boiling points (i.e. Benzene/Toluene mixture). However, distillation is extremely complicated when the concentration of the separating components are similar in the liquid and vapor phase, called the azeotropic point (e.g. Ethanol/Water or IPA/Water mixtures). Distillation alone cannot perform any further separation beyond the azeotropic point.

pervaporation