Enhanced Pervaporation Performance of Multi-layer PDMS/PVDF Composite Membrane for Ethanol Recovery from Aqueous Solution

Zhan, Xia; Li, Jiding; Huang, Junqi; Chen, Cuixian

doi:10.1007/s12010-008-8510-y

Cited by 51 publications

(22 citation statements)

References 24 publications

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“…Polydimethylsiloxane (PDMS) has already been used for pervaporation of organics/inorganics mixture. [10][11][12][13][14][15][16][17] Jadav et al 10 prepared high flux PDMS membranes for separation of organics from water by pervaporation. The influence of film thickness on the structure and properties of PDMS membrane was studied.…”

Section: Introductionmentioning

confidence: 99%

“…Thinner membrane had a relatively loose structure, which resulted into low selectivity and high flux. Zhan et al 11 prepared multilayer PDMS/PVDF composite membranes with an alternative PDMS/PVDF/nonwoven-fiber/PVDF/ PDMS configuration. The composite membrane gave separation factor of 15 and permeation rate of 0.45 kg.m 22 .h 21 for 5 wt % ethanol feed at 608C.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of Silicalite‐1/PDMS surface sieving pervaporation membrane for separation of ethanol/water mixture

Liu

et al. 2015

J of Applied Polymer Sci

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To improve the pervaporation performance of Silicalite-1/PDMS composite membrane by adding a small amount of Silicalite-1 zeolite, novel Silicalite-1/PDMS surface sieving membranes (SSMs) were prepared by attaching Silicalite-1 particles on the PDMS membrane surface. The obtained membranes and traditional mixed-matrix membranes (MMMs) were characterized by SEM, XRD, TGA, FT-IR, and pervaporation separation of ethanol-water mixture. Effects of Silicalite-1 particles content, feed temperatures, and feed compositions on the separation performance were discussed. From the cross-section view SEM images of SSMs, a two-layer structure was observed. The thickness of the Silicalite-1 layer was about 300 nm to 2 lm. The TGA analysis indicates that the zeolite concentration in 3 wt % SSM is lower than 10 wt % MMMs. In the ethanol/water pervaporation experiment, the separation factor of Silicalite-1/PDMS SSMs increased considerably compared with pure PDMS membrane. When the suspensions concentrations of Silicalite-1 particles reached 3 wt %, the separation factor was about 217% increase over pure PDMS membrane and 52.9% increase over 10 wt % Silicalite-1/PDMS MMMs. As the ethanol concentration in the feed increases, the separation factor of SSMs increases, whereas permeation flux decreases. At the same time, with increasing operating temperature, the permeation flux of SSMs increased. The stability of SSMs at high temperature is better than the traditional MMMs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Silicalite‐1/PDMS surface sieving pervaporation membrane for separation of ethanol/water mixture

Liu

et al. 2015

J of Applied Polymer Sci

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“…PDMS membrane was prepared as the way proposed by Zhan et al [34]. Different mass of PDMS was dissolved in n-hexane and TEOS and DBTL was subsequently added.…”

Section: Preparation and Characterization Of Pdms Membranementioning

confidence: 99%

Nonequilibrium Dissolution-diffusion Model for PDMS Membrane Pervaporation of ABE Water Binary System

Yang¹,

Wu²

2016

J Membra Sci Technol

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Pore flow model defined the dense layer as "pore" like nanofiltration which was not very reasonable, since the "pore" free volume formed by random movement of polymer chain was not fixed. Virtual phase change model was the combination of dissolution-diffusion model and pore flow model which was of some self-contradiction. Evaporationpermeation model treated the pervaporation as two separate processes, liquid evaporation and vapor permeation. The total separation factor was not equaled to the product of that two separation factors in the real operation. Irreversible thermodynamics model was set up on the chemical potential considering the coupling interaction of the AbstractPrevious models of equilibrium dissolution-diffusion, pore flow and virtual phase change cannot describe the mass transfer process of pervaporation precisely. The fact that dissolution process on the surface of the membrane does not reach equilibrium is seldom emphasized in the literature. The aim of the present work is to develop the nonequilibrium dissolution-diffusion model (nonequilibrium model) for membrane pervaporation process. In this research, the steps of dissolution and desorption were treated as the pseudo surface reaction processes on the surface based on the hypothesis of nonequilibrium dissolution at the interface of the feed liquid and membrane. The semi-experimental model was set based on steady state mass transfer, ignoring the concentration polarization and adsorption at the permeation side. Through linear fitting of the flux with different thickness of the membrane, the diffusion coefficients and adsorption kinetic rate constants of the model were achieved with equilibrium partition coefficient estimated by UNIFAC-ZM model. The calculated values of the model were well in consistent with experimental flux in the vacuum pervaporation of acetone, butanol and ethanol with polydimethylsiloxane membrane. The nonequilibrium model and its parameters will be further applied for prediction of separation performance and selection of operation conditions.

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“…The resulted homogeneous PDMS solution was coated onto the up side of the porous PVDF substrate. Then, the composite membranes were dried at room temperature for 12 h to evaporate the solvent, and were completely crosslinked in an oven at 80°C for 5 h [34,35].…”

Section: Membrane Preparationmentioning

confidence: 99%

“…The PV experiments in lab were conducted, and the self-designed PV apparatus was described in our previous studies [13,34,35]. The effective area of flat-sheet membrane was 22.4 cm 2 .…”

Section: Experimental Equipmentmentioning

confidence: 99%

Preparation and characterization of ZSM-5/PDMS hybrid pervaporation membranes: Laboratory results and pilot-scale performance

Liu

Chen

Zhan

et al. 2015

Separation and Purification Technology

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Enhanced Pervaporation Performance of Multi-layer PDMS/PVDF Composite Membrane for Ethanol Recovery from Aqueous Solution

Cited by 51 publications

References 24 publications

Preparation and characterization of Silicalite‐1/PDMS surface sieving pervaporation membrane for separation of ethanol/water mixture

Preparation and characterization of Silicalite‐1/PDMS surface sieving pervaporation membrane for separation of ethanol/water mixture

Nonequilibrium Dissolution-diffusion Model for PDMS Membrane Pervaporation of ABE Water Binary System

Preparation and characterization of ZSM-5/PDMS hybrid pervaporation membranes: Laboratory results and pilot-scale performance

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