NDLI: Computational fluid dynamic modeling of a pervaporation process for removal of styrene from petrochemical wastewater

Content Provider	Royal Society of Chemistry (RSC)
Author	Darvishi, Abdolmajid Moraveji, Mostafa Keshavarz Pazuki, Gholamreza Aroujalian, Abdolreza
Copyright Year	2016
Abstract	In this study, a predictive model was developed to describe the process of separation of volatile organic compounds. The model was based on solution–diffusion theory and computational fluid dynamics (CFD) was applied to model the pervaporation process for the separation of styrene–water in a PDMS membrane. Florry–Huggins-FV, Florry–Huggins and UNIFAC models were adopted to predict the equilibrium adsorption of styrene and water into the PDMS membrane and the results were compared. For the penetration, Duda's and Fujita's free volume theories were compared to estimate the diffusivity of penetration through the membrane. The conservation equations including the continuity and the momentum balance equations in membrane modulus were solved simultaneously using a finite element scheme. The studied system includes styrene–water solution which is adsorbed on a polydimethylsiloxane (PDMS, polydimethylsiloxane) nonporous polymer membrane. In this mass transfer model, diffusion coefficients through the membrane were taken into account as a function of concentration and they were estimated based on free volume theory. The proposed model was validated using experimental data obtained from pervaporation tests. The simulation results for various feed concentrations, feed temperatures and membrane thickness were in satisfactory agreement with experimental data. The CFD results showed that both the permeation flux and the styrene enrichment factor increased with the increase in concentration of styrene in the feed. By increasing membrane thickness the permeation flux decreased while the enrichment factor increased. The developed model can predict well the mass transfer process occurring in the feed and the membrane.
Starting Page	15327
Ending Page	15339
Page Count	13
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	19
Journal	RSC Advances
DOI	10.1039/c5ra18700a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	UNIFAC Huggins Computational fluid dynamics Polymer Volatile organic compound Fujita Finite element method Oswald Duda Adsorption Styrene Diffusion Polydimethylsiloxane Pervaporation
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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