The use of VMD data/model to test different thermodynamic models for vapour-liquid equilibrium



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Izquierdo Gil, María Amparo and Abildskov, J. and Jonsson, G. (2004) The use of VMD data/model to test different thermodynamic models for vapour-liquid equilibrium. Journal of Membrane Science, 239 (2). pp. 227-241. ISSN 0376-7388

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Vacuum membrane distillation (VMD) has been studied as a separation process to remove volatile organic compounds from aqueous streams. A vapour pressure difference across a microporous hydrophobic membrane is the driving force for the mass transport through the membrane pores (this transport takes place in vapour phase). The vapour pressure difference is obtained in VMD processes by applying a vacuum on one side of the membrane. The membrane acts as a mere support for the liquid-vapour equilibrium. The evaporation of the liquid stream takes place on the feed side of the membrane, and the condensation on the permeate side of the membrane. The paper focus on aroma stripping using VMD; factors influencing flux and separation performance using selected model aroma compounds have been studied. Mainly the following parameters have been examined-aroma compounds: activity coefficient/vapour pressure values; membrane type: PTFE/PP/PVDF; feed flow rate; feed temperature. A comparison is made between different thermodynamic models for calculating the vapour-liquid equilibrium at the membrane/pore interface.

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© 2004 Elsevier B.V. Postdoctoral grant from Universidad Complutense of Madrid to M.A. Izquierdo-Gil, Project PB-98-07-88 (CYCYT, Spain) and support from the Danish Directorate for Development are gratefully acknowledged

Uncontrolled Keywords:Vacuum Membrane Distillation, Vapour–Liquid Equilibrium, Activity Coefficient, Knudsen Flow
Subjects:Sciences > Physics > Thermodynamics
ID Code:25273
Deposited On:09 May 2014 07:40
Last Modified:11 Mar 2016 19:32

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