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Separation of aqueous salt solution by pervaporation through hybrid organic-inorganic membrane: effect of operating conditions

Xie, Zongli and Ng, Derrick and Hoang, Manh and Duong, Tuan and Gray, Stephen R (2011) Separation of aqueous salt solution by pervaporation through hybrid organic-inorganic membrane: effect of operating conditions. Desalination, 273 (1). pp. 220-225. ISSN 1873-4464

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Abstract

Hybrid polymer-inorganic membranes were prepared by crosslinking poly(vinyl alcohol) (PVA), maleic acid (MA) and silica via an aqueous sol–gel route. Membrane characterisation results revealed silica nanoparticles (b10 nm) were well dispersed in the polymer matrix and significantly reduced swelling of the membrane. The membranes were tested for pervaporation separation of aqueous salt solution with NaCl concentrations of 0.2–5.0 wt% at temperatures 20–65 °C, feed flowrates 30–150 mL/min and permeate pressures 2–40 Torr. The salt rejection remained high (up to 99.9%) under all operating conditions. A high water flux of 11.7 kg/m2 h could be achieved at a feed temperature of 65 °C and a vacuum of 6 Torr. The effect of operating conditions on water flux is discussed in relation to diffusion coefficients of water and fundamental transport mechanism through the membrane. The activation energy for water permeation was found to vary from 23.8 to 20.1 kJ/kmol when the salt concentration in the feed was increased from 0.2 to 5.0 wt%.

Item Type: Article
Uncontrolled Keywords: ResPubID23288, salt rejection, pervaporation, hybrid polymer–inorganic membranes, hybrid organic–inorganic membranes, PVA, poly(vinyl alcohol)
Subjects: Faculty/School/Research Centre/Department > Institute for Sustainability and Innovation (ISI)
FOR Classification > 0904 Chemical Engineering
Depositing User: VUIR
Date Deposited: 16 May 2011 06:30
Last Modified: 10 Feb 2015 04:19
URI: http://vuir.vu.edu.au/id/eprint/6750
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Citations in Scopus: 2 - View on Scopus

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