Quantitative evaluation of concentration polarization in the permeation of VOCs/water mixtures through PDMS membrane using model equation

Park, Y.I.; Yeom, C. K.; Kim, B.S.; Suh, Jeong-Kwon; Lee, J.M.; Joo, Hyeok-Jong

doi:10.1016/j.desal.2007.09.055

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…The calculated values of the concentration polarization modulus continuously increase with the feed flow velocity for all MTBE concentrations ( Figure 10 ). Similar trends were obtained in the previous studies where concentration polarization was analyzed in the process of pervaporation of organochlorine compounds [ 63 ] and methyl acetate [ 43 ] from a water solution. The concentration polarization modulus increases with the organic composition of the feed mixture ( Figure 10 ), which is consistent with the results of Reference [ 64 ].…”

Section: Resultssupporting

confidence: 87%

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

et al. 2020

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For the first time, the effect of the side-chain in polyalkylmethylsiloxane towards pervaporative removal of methyl tert-butyl ether (MTBE) from water was studied. The noticeable enhancement of separation factor during the pervaporation of 1 wt.% MTBE solution in water through the dense film (40–50 µm) can be achieved by substitution of a methyl group (separation factor 111) for heptyl (161), octyl (169) or decyl (180) one in polyalkylmethylsiloxane. Composite membrane with the selective layer (~8 µm) made of polydecylmethylsiloxane (M10) on top of microfiltration support (MFFK membrane) demonstrated MTBE/water separation factor of 310, which was 72% greater than for the dense film (180). A high separation factor together with an overall flux of 0.82 kg·m−2·h−1 allowed this M10/MFFK composite membrane to outperform the commercial composite membranes. The analysis of the concentration polarization modulus and the boundary layer thickness revealed that the feed flow velocity should be gradually increased from 5 cm·s−1 for an initial solution (1 wt.% of MTBE in water) to 13 cm·s−1 for a depleted solution (0.2 wt.% of MTBE in water) to overcome the concentration polarization phenomena in case of composite membrane M10/MFFK (Texp = 50 °C).

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Section: Resultssupporting

confidence: 87%

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

et al. 2020

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“…This is necessary for a correct membrane design, since it is useless decreasing as much as possible the membrane thickness for increasing the flux if part of the transport resistance is in the feed boundary layer . Several papers have analyzed the concentration polarization in gas permeation both theoretically − and experimentally. − The main question to be answered is how the simultaneous effect of both the polarization and membrane layers can be exactly described in the presence of not negligible convective velocity. Recently, Avila et al measured the CO 2 and methane fluxes through SAPO-34 membranes at high pressure and the Pe value obtained changed between 0.02 and 0.28.…”

Section: Introductionmentioning

confidence: 99%

Separate Expression of Polarization Modulus and Enrichment by Mass Transport Parameters for Membrane Gas Separation

Nagy

Dudás

2013

Ind. Eng. Chem. Res.

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Several membrane processes involve the convective velocity in the boundary layer due to high solubility and diffusivity in the membrane. The relatively high value of the convective velocity, as it can exist during gas separation, can cause convex concentration distribution in the boundary layer, and consequently, it can alter the diffusive flow throughout the boundary layer, as well. How the Peclet number affects the diffusive flow is discussed in the first part of this study. It has been stated when the Pe > about 0.3−0.5, the diffusive mass transfer coefficient of the boundary layer obtained by prediction using dimensionless quantities, should be corrected by a factor depending on the Peclet number, obtained by the exact solution of the boundary layer's concentration distribution. The curvature effect of the concentration distribution is then taken into account by this factor. In the second part of this study, the polarization modulus and enrichment are separately expressed by means of the mass transport parameters of the polarization and membrane layer. Applying these explicit equations, the change of both the polarization modulus and enrichment is shown as a function of the mass transport parameters, as mass transfer coefficient of the layers, Peclet number, and solubility coefficient. These equations enable the user to predict the value of enrichment and/or the polarization modulus under any operating conditions for gas separation using a dense, polymeric membrane.

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Reactive Imprint Lithography: Combined Topographical Patterning and Chemical Surface Functionalization of Polystyrene‐block‐poly(tert‐butyl acrylate) Films

Duvigneau

Cornelissen

Valls

et al. 2010

Adv Funct Materials

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Here, reactive imprint lithography (RIL) is introduced as a new, one‐step lithographic tool for the fabrication of large‐area topographically patterned, chemically activated polymer platforms. Films of polystyrene‐block‐poly(tert‐butyl acrylate) (PS‐b‐PtBA) are imprinted with PDMS master stamps at temperatures above the corresponding glass transition and chemical deprotection temperatures to yield structured films with exposed carboxylic acid and anhydride groups. Faithful pattern transfer is confirmed by AFM analyses. Transmission‐mode FTIR spectra shows a conversion of over 95% of the tert‐butyl ester groups after RIL at 230 °C for 5 minutes and a significantly reduced conversion to anhydride compared to thermolysis of neat films with free surfaces in air or nitrogen. An enrichment of the surface layer in PS is detected by angle‐resolved X‐ray photoelectron spectroscopy (XPS). In order to demonstrate application potentials of the activated platforms, a 7 nm ± 1 nm thick NH2‐terminated PEG layer (grafting density of 0.9 chains nm−2) is covalently grafted to RIL‐activated substrates. This layer reduces the non‐specific adsorption (NSA) of bovine serum albumin by 95% to a residual mass coverage of 9.1 ± 2.9 ng cm−2. As shown by these examples, RIL comprises an attractive complementary approach to produce bio‐reactive polymer surfaces with topographic patterns in a one‐step process.

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Quantitative evaluation of concentration polarization in the permeation of VOCs/water mixtures through PDMS membrane using model equation

Cited by 8 publications

References 4 publications

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

Separate Expression of Polarization Modulus and Enrichment by Mass Transport Parameters for Membrane Gas Separation

Reactive Imprint Lithography: Combined Topographical Patterning and Chemical Surface Functionalization of Polystyrene‐block‐poly(tert‐butyl acrylate) Films

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