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The influence of permeant and membrane properties on mass transfer in pervaporation of volatile organic compounds from dilute aqueous solutions

Olsson, Jenny; Trägårdh, Gun LU and Lipnizki, F (2002) In Separation Science and Technology 37(6). p.1199-1223
Abstract
In this study, a dilute mixture of volatile organic compounds in aqueous solution was separated by means of hydrophobic pervaporation, using three different poly(octylmethyl siloxane) membranes of various thicknesses. The permeabilities were determined for homologous series of compounds from the chemical groups of alcohols, esters, and aldehydes, and they were then related to some characteristic properties of the permeants. The molar volume, the activity coefficient at infinite dilution in water, and the ability to form hydrogen bonds could explain the resulting permeability, when comparing the values of the different permeants. A critical molar volume was identified, above which the permeability started to decrease drastically with... (More)
In this study, a dilute mixture of volatile organic compounds in aqueous solution was separated by means of hydrophobic pervaporation, using three different poly(octylmethyl siloxane) membranes of various thicknesses. The permeabilities were determined for homologous series of compounds from the chemical groups of alcohols, esters, and aldehydes, and they were then related to some characteristic properties of the permeants. The molar volume, the activity coefficient at infinite dilution in water, and the ability to form hydrogen bonds could explain the resulting permeability, when comparing the values of the different permeants. A critical molar volume was identified, above which the permeability started to decrease drastically with increase in the permeant molar volume as the mobility of the permeant was hindered sterically by the distance between the polymer chains of the membrane. This critical molar volume was related to the degree of crosslinking of the selective layer. Thus, it could be concluded that membranes should be designed with a low degree of crosslinking to obtain better separation properties, especially for larger permeants. From the results, it could also be concluded that the porous support layer could affect the separation properties significantly. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
membrane thickness, porous support, volatile organic compound, pervaporation, permeability
in
Separation Science and Technology
volume
37
issue
6
pages
1199 - 1223
publisher
Marcel Dekker
external identifiers
  • wos:000175385400001
  • scopus:0036237303
ISSN
0149-6395
DOI
10.1081/SS-120002607
language
English
LU publication?
yes
id
a67bbcf1-8f7d-4d4d-ae14-ba7215ce4b95 (old id 338506)
date added to LUP
2007-11-08 08:26:28
date last changed
2017-08-27 05:25:37
@article{a67bbcf1-8f7d-4d4d-ae14-ba7215ce4b95,
  abstract     = {In this study, a dilute mixture of volatile organic compounds in aqueous solution was separated by means of hydrophobic pervaporation, using three different poly(octylmethyl siloxane) membranes of various thicknesses. The permeabilities were determined for homologous series of compounds from the chemical groups of alcohols, esters, and aldehydes, and they were then related to some characteristic properties of the permeants. The molar volume, the activity coefficient at infinite dilution in water, and the ability to form hydrogen bonds could explain the resulting permeability, when comparing the values of the different permeants. A critical molar volume was identified, above which the permeability started to decrease drastically with increase in the permeant molar volume as the mobility of the permeant was hindered sterically by the distance between the polymer chains of the membrane. This critical molar volume was related to the degree of crosslinking of the selective layer. Thus, it could be concluded that membranes should be designed with a low degree of crosslinking to obtain better separation properties, especially for larger permeants. From the results, it could also be concluded that the porous support layer could affect the separation properties significantly.},
  author       = {Olsson, Jenny and Trägårdh, Gun and Lipnizki, F},
  issn         = {0149-6395},
  keyword      = {membrane thickness,porous support,volatile organic compound,pervaporation,permeability},
  language     = {eng},
  number       = {6},
  pages        = {1199--1223},
  publisher    = {Marcel Dekker},
  series       = {Separation Science and Technology},
  title        = {The influence of permeant and membrane properties on mass transfer in pervaporation of volatile organic compounds from dilute aqueous solutions},
  url          = {http://dx.doi.org/10.1081/SS-120002607},
  volume       = {37},
  year         = {2002},
}