Pervaporation and vapor permeation at the azeotropic point or in the vicinity of the LLE boundary phases of organic/aqueous mixtures

Pervaporation and vapor permeation experiments have been performed in order to investigate separately the effect of feed density and concentration on the material transport from the bulk feed to the bulk permeate. Measurements have been carried out for the azeotropic mixtures ethanol/water, 1,4-diox...

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Bibliographic Details
Published inJournal of membrane science Vol. 107; no. 3; pp. 277 - 282
Main Authors Schehlmann, M.S., Wiedemann, E., Lichtenthaler, R.N.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 30.11.1995
Elsevier
Subjects
Applied sciences
Chemical engineering
Exact sciences and technology
Membrane separation (reverse osmosis, dialysis...)
Organic/aqueous mixtures
Pervaporation
Vapor permeation
Organic/aqueous mixtures
Vapor permeation
Pervaporation
Ethanol
Swelling
Polymeric membranes
Concentration polarization
Alcohol
Dehydration
Experimental study
Oxygen heterocycle
Composite material
Mass transfer
Gaseous permeation
Membrane separation
Polyvinylalcohol
Acrylonitrile polymer
Ethyl ether
Aqueous solution
Organic compounds
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Summary:Pervaporation and vapor permeation experiments have been performed in order to investigate separately the effect of feed density and concentration on the material transport from the bulk feed to the bulk permeate. Measurements have been carried out for the azeotropic mixtures ethanol/water, 1,4-dioxane/water and 2-propanol/water at 333 and 353 K using a hydrophilic PVA/PAN-composite-membrane. In particular the influence of the feed density on the fluxes has been investigated close to and at the azeotrope where the feed concentration is almost the same in both processes. The fluxes observed are smaller and the selectivity is larger in vapor permeation compared to pervaporation. Using the same hydrophilic membrane additional pervaporation experiments for binary mixtures of 1-butanol/water and 1-pentanol/water have been performed at 333 K, and for diethyl ether/water at 323 K in the vicinity of the LLE boundary phases. Although the concentrations in the two corresponding equilibrium phases are different almost identical permeate fluxes and selectivities are obtained.
ISSN:0376-7388
1873-3123
DOI:10.1016/0376-7388(95)00142-6