Mass transfer simulation of solvent extraction in hollow-fiber membrane contactors

Fadaei, Farzad; Shirazian, Saeed; Ashrafizadeh, Seyed Nezameddin

doi:10.1016/j.desal.2011.02.039

Cited by 43 publications

(14 citation statements)

References 15 publications

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“…[24] Application of membranes for the specific process depends on the type of media, process conditions, and costs. [4,[25][26][27][28][29] Although membrane processes excel in great operational performance and low costs, the process understanding still needs to be improved. The latter means that modeling of membrane processes is of great importance to further improve the applications of membranes for the industry.…”

Section: Doi: 101002/mats201700084mentioning

confidence: 99%

“…So far, membranes have been used for various applications in gas and liquid separation such as gas purification, hydrogen purification,[11,] natural gas sweetening, water desalination, pervaporation, and bioseparation . Application of membranes for the specific process depends on the type of media, process conditions, and costs . Although membrane processes excel in great operational performance and low costs, the process understanding still needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Asadollahzadeh

Raoufi

Rezakazemi

et al. 2018

Macro Theory & Simulations

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A mechanistic model is developed to simulate ethanol purification using membrane technology. In the considered process, a feed solution containing 10 wt% water + 90 wt% ethanol is contacted with a polymeric dense membrane in a pervaporation system. The membrane selectively separates water from solution in order to purify the ethanol. In the development of the model, it is assumed that the water is the main penetrant through the membrane due to the hydrophilicity of membrane material. The mass fraction of water molecules in the feed solution, as well as membrane, is estimated using Maxwell–Stefan approach. The governing equations are then solved using finite element method in order to predict mass fraction, mass transfer flux, and velocity of the solution in the membrane module. The results indicate that the model can predict the formation of concentration and velocity boundary layer in the feed solution near the membrane/feed interface. Moreover, the developed model is robust and reliable in the understanding of membrane separation processes applicable for dehydration of alcohols.

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Section: Doi: 101002/mats201700084mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Asadollahzadeh

Raoufi

Rezakazemi

et al. 2018

Macro Theory & Simulations

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“…The scaled model equations with the boundary conditions were solved using COMSOL Multiphysics software version 3.5a, which uses finite element method for numerical solution of differential equations. The finite element analysis is com-bined with adaptive meshing and error control using numerical solver of UMFPACK, which has been shown great application and accuracy in simulation of membrane contactors [1,7,9,10,13,[21][22][23][24]39]. Error reduction during numerical simulation is also obtained and shown in Fig.…”

Section: Numerical Solutionmentioning

confidence: 99%

Separation of greenhouse gases from gas mixtures using nanoporous polymeric membranes

Mohammadi

Shirazian

Asadollahzadeh

et al. 2014

Polymer Engineering & Sci

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Removal of greenhouse gases from gas streams using porous membranes was carried out in this work. Theoretical studies were performed in terms of mathematical modeling and numerical simulation of CO2 capture in a flat‐sheet membrane contactor. Numerical simulation was performed using computational fluid dynamics (CFD) of mass and momentum transfer in the membrane module for laminar flow conditions. Physical absorption was considered in the simulations for absorption of CO2 in pure water. CO2 concentration distribution in the membrane module was determined through numerical solution of continuity equation coupled with the Navier‐Stokes equations. The modeling predictions indicated that the CO2 concentration difference is not appreciable in the membrane direction. Moreover, velocity distribution was determined in the liquid side of membrane contactor. CFD also represents a design and optimization tool for membrane gas separation processes. POLYM. ENG. SCI., 55:975–980, 2015. © 2014 Society of Plastics Engineers

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“…The results show the maximum pressure difference is 6.62 kPa while t e =20 s and a/o=3.0, which is far beyond the breakthrough pressure of 500 kPa. Moreover, the pressure drop along the membrane module is not appreciable, which can reduce the operating costs of the process (Fadaei et al, 2011).…”

Section: Influence Of Operating Parametersmentioning

confidence: 99%

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

Kong

Cheng

Wang

et al. 2016

J. Zhejiang Univ. Sci. A

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Non-dispersive solvent extraction (NDSE) with p-xylene as extractant was employed as a novel separation method to recover both p-toluic (PT) acid and water from purified terephthalic acid (PTA) wastewater. The mass transport behavior of PT acid from aqueous solution to p-xylene was investigated by experiments and numerical simulation. Experiments showed that NDSE is feasible and effective. Residual PT acid in the raffinate can be reduced to lower than the permitted limit of wastewater re-use (100 g/m 3 ) with extraction time longer than 60 s in industrial conditions. A mathematical model of PT acid mass transport was developed to optimize the membrane module performance. The model was validated with the experimental results with relative errors of less than 6%. Numerical analysis for mass transfer through the lumen side, the porous membrane layer, and the shell side showed that PT acid transport in the aqueous solution is the rate determining step. The effects of the membrane and operating parameters on membrane module performance were investigated by means of computational simulations. The key parameters suggested for industrial NDSE design are: fiber inner radius r 1 =200-250 μm, extraction time t e =50-60 s, aqueous/ organic volumetric ratio a/o=9.0, and temperature T=318 K.

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Mass transfer simulation of solvent extraction in hollow-fiber membrane contactors

Cited by 43 publications

References 15 publications

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Separation of greenhouse gases from gas mixtures using nanoporous polymeric membranes

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

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