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

Pervaporation is a method for the separation of mixtures of liquids by partial vaporization through a non-porous membrane.

Pervaporation differs from other membrane processes as a change in phase occurs across the membrane:
the transported species move from a liquid phase on one side of the membrane to a vapour phase on the other.

The separation principle governing pervaporation is mainly due to polarity differences and differs significantly from distillation which depends on differences in vapour liquid equilibrium relationships to affect a separation. Pervaporation is used in situations where distillation is impossible, difficult or uneconomic.

The elucidation of the selective transport and ‘evaporation’ through a membrane is attributed to Kahlenberg in 1906. He observed transport through a rubber membrane. However, it was Kober who first coined the term pervaporation to describe the transport of water through a collodion membrane in 1917.


PROCESS ENGINEERING


step-by-step selection of a pervaporation process
step-by-step selection of a pervaporation process

Pervaporation (liquid feed)?
or Vapour permeation (vapour feed)?

Continuous or batch process ?



the hybrid Distillation-Pervaporation processes
How to combine pervaporation and distillation

combining Distillation and Pervaporation:



APPLICATIONS

Pervaporation and vapour permeation are used for an effective and economic separation of mixtures of substances with small volatility differences (boiling point) and azeotropic mixtures.

- Ethanol dehydration (Bioethanol, Fuel Ethanol, Power ethanol)
- Solvent dehydration (Alcohol, Ketones, Esters,..)
- water removal from condensation reactions
- methanol (or water or ethanol) removal from transesterification reactions