Modeling and simulation of mass transfer in near-critical extraction using a hollow fiber membrane contactor

Estay, Humberto; Bocquet, S.; Romero, Julio; Sánchez, J.; Rios, G.M.; Valenzuela, Fernando

doi:10.1016/j.ces.2007.05.037

Cited by 25 publications

(30 citation statements)

References 26 publications

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“…Unlike most membrane processes, membrane contactors have no selectivity to the separation. The main purpose of these devices is to keep the involved phases separated, operating as an inert medium, which allows gas and liquid phases contact without dispersion [26][27][28][29] . This work investigated the ozone resistance of polydimethylsiloxane, polypropylene, polytetrafluoroethylene, polyvinylidenefluoride, polyetherimide and polyethersulfone.…”

Section: Abstract: Ozone Membrane Contactor Polymer Degradation Wamentioning

confidence: 99%

Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

2015

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Section: Abstract: Ozone Membrane Contactor Polymer Degradation Wamentioning

confidence: 99%

Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

2015

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“…In addition in ordinary equipment as towers operating problems such as flooding and channelizing can be problematic. Therefore, many researchers studies on using hollow fiber membranes as a new equipment to absorb organic materials, carbon dioxide, and other acidic gases [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Also In recent years effect of different parameters in separation process using hollow fibers have been studied [19][20][21][22][23].…”

Section: List Of Symbolsmentioning

confidence: 99%

“…5) at fibers outer surface, C i-shell = C i-membrane and V z = 0 (No slip condition)(6) at module surface, ∂C i-shell ∂r = 0and V z = 0 (No slip condition) (7) at z = 0, P = P atm(8) at fibers inner surface, C i-membrane = C i-tube m Shell and tube Hollow fiber membrane contactor and 2D cut plan…”

mentioning

confidence: 99%

New 3-dimensional CFD modeling of CO2 and H2S simultaneous stripping from water within PVDF hollow fiber membrane contactor

2015

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feed temperature, feed velocity, and solvent velocity is optimized according to synergistic effects. Simulation results show that, in the optimum operating conditions the removal percentage of H 2 S and CO 2 are 27 and 21 % respectively. List of symbolsI I-component (CO 2 and H 2 S) C 0 Inlet mixture concentration (mol/m 3 ) C Concentration (mol/m 3 ) C i-membrane Component i concentration in the membrane (mol/m 3 ) C i-shell Component i concentration in the shell (mol/ m 3 ) C i-tube Component i concentration in the tube (mol/ m 3 ) D Diffusion coefficient (m 2 /s) D i-membrane Diffusion coefficient of component i in the membrane (m 2 /s) D i-shell Diffusion coefficient of component i in the shell (m 2 /s) D i-tube Diffusion coefficient of component i in the tube (m 2 /s) F Body force (N) J i Diffusive flux of species i (mol/s) m Physical solubility (dimensionless) r Radial coordinate (m) r 1 Inner tube radius (m) r-2 Outer tube radius (m) r-3 Inner shell radius (m) R i Reaction rate of species i (mol/s) t Time (s) u Average velocity in the tube side (m/s) V Velocity vector (m/s) V z z Direction velocity in the contactor (m/s) V z-shell z Direction velocity in the shell (m/s) AbstractIn this paper a 3-dimensional modeling of simultaneous stripping of carbon dioxide (CO 2 ) and hydrogen sulfide (H 2 S) from water using hollow fiber membrane made of polyvinylidene fluoride is developed. The water, containing CO 2 and H 2 S enters to the membrane as feed. At the same time, pure nitrogen flow in the shell side of a shell and tube hollow fiber as the solvent. In the previous methods of modeling hollow fiber membranes just one of the membranes was modeled and the results expand to whole shell and tube system. In this research the whole hollow fiber shell and tube module is modeled to reduce the errors. Simulation results showed that increasing the velocity of solvent flow and decreasing the velocity of the feed are leads to increase in the system yield. However the effect of the feed velocity on the process is likely more than the influence of changing the velocity of the gaseous solvent. In addition H 2 S stripping has higher yield in comparison with CO 2 stripping. This model is compared to the previous modeling methods and shows that the new model is more accurate. Finally, the effect of feed temperature is studied using response surface method and the operating conditions of * Bahram Dabir Heat Mass Transfer 1 3 Greek symbols ∇ Gradient (dimensionless) ρ Density (kg/m 3 ) η Dynamic viscosity (m 2 /s) Subscripts in Inlet out Outlet V z-tube z Direction velocity in the tube (m/s) V inlet Inlet velocity to the contactor (m/s) z Axial distance (m)

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“…In this process a macroporous membrane allows contact between two phases, where an aqueous liquid solution is circulated on one side and on the other side the extraction solvent in a SCF (Estay et al, 2007). However, supercritical CO 2 (scCO 2 ) shows affinity with lipophilic compounds and this characteristic becomes an inconvenience when polar compounds must be extracted, therefore, organic solvent (ethanol, methanol, ethyl acetate) mixtures -CO 2 under pressure have also been used to improve the extraction.…”

Section: Membrane-based Supercritical Fluid Extractionmentioning

confidence: 99%

Red Wine Extract Obtained by Membrane-Based Supercritical Fluid Extraction: Preliminary Characterization of Chemical Properties.

Silva

Romero

Morales

et al. 2017

Braz. J. Chem. Eng.

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-This study aims to obtain an extract from red wine by using membrane-based supercritical fluid extraction. This technique involves the use of porous membranes as contactors during the dense gas extraction process from liquid matrices. In this work, a Cabernet Sauvignon wine extract was obtained from supercritical fluid extraction using pressurized carbon dioxide as solvent and a hollow fiber contactor as extraction setup. The process was continuously conducted at pressures between 12 and 18 MPa and temperatures ranged from 30 to 50ºC. Meanwhile, flow rates of feed wine and supercritical CO 2 varied from 0.1 to 0.5 mL min -1 and from 60 to 80 mL min -1 (NCPT), respectively. From extraction assays, the highest extraction percentage value obtained from the total amount of phenolic compounds was 14% in only one extraction step at 18MPa and 35ºC. A summarized chemical characterization of the obtained extract is reported in this work; one of the main compounds in this extract could be a low molecular weight organic acid with aromatic structure and methyl and carboxyl groups. Finally, this preliminary characterization of this extract shows a remarkable ORAC value equal to 101737 ± 5324 µmol Trolox equivalents (TE) per 100 g of extract.

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Modeling and simulation of mass transfer in near-critical extraction using a hollow fiber membrane contactor

Cited by 25 publications

References 26 publications

Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

New 3-dimensional CFD modeling of CO2 and H2S simultaneous stripping from water within PVDF hollow fiber membrane contactor

Red Wine Extract Obtained by Membrane-Based Supercritical Fluid Extraction: Preliminary Characterization of Chemical Properties.

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