IBMEM - Ing.-Büro für Membrantechnik
Max-Planck-Str.9, 61381 Friedrichsdorf (Frankfurt/Main), Germany Tel. +49 (0)6172 137-132 - E-Mail: info@ibmem.com |
other pressure driven membrane separations (micro-, ultrafiltration,..) |
Principles and Applications of PERVAPORATION |
Membrane Screening Test and Pilotes |
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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 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
APPLICATIONS Pervaporation and vapour permeation are used for an effective and economic separation of mixtures of substances with small difference in boiling point and azeotropic mixtures. - - - continuous water removal from condensation reactions - continuous methanol removal from transesterification reactions |