Vapour permeation
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Pervaporation
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other pressure driven
membrane separations
(micro-, ultrafiltration,..)
Principles and
Applications of
PERVAPORATION
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SEPARATION PRINCIPLE

Pervaporation vs. Distillation

The separation principle governing pervaporation is a combination of selective sorption/solution and diffusion.
The fractionation process is mainly due to polarity differences, and not to the volatility difference of the components in the feed.
It differs significantly from distillation, which depends on differences in vapour liquid equilibrium relationships.
Pervaporation can be considered in situations where distillation is impossible, difficult or uneconomic - mainly for systems that demonstrate azeotropic behaviour.

Pervaporation vs. Filtration

FILTRATION
with a porous membrane
PERVAPORATION
with a dense membrane
Transport mechanism convective flow through pores diffusional flow through membrane
Selection criteria Pore size vs. particule (molecule) size Chemical affinity between molecules and membranes
Driving force pressure difference partial pressure difference