• Title/Summary/Keyword: composite membrane

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Pervaporation Separation of Organic Solvent/water Mixtures by CMCJPVA Composite Membrane (CMC/PVA 복합막에 의한 유기용제l물 혼합액의 투과증발분리)

  • 배기서;홍영기
    • Textile Science and Engineering
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    • v.32 no.11
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    • pp.1082-1089
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    • 1995
  • The purpose of this study is to develop new composite membrane which has hi선 selectivity and acceptable permeation rates for separating the organic solvent-water mixture systems by pervaporation technique. Therefore, CMC and PVA, which are highly absorbent polymeric materials, were used to prepare the composite membrane. A 2∼3wt% aqueous ChIC solution and a 7∼10wt% aqueous PVA solution were mixed together to from a homogeneous blended solution. The composite membrane was prepared by casting a polymer solution on the nonwoven fabric and then removing the solvent. The thickness of the active layer of CMC/PVA composite membrane was about 20∼30wt The experimental results indicated that the composite membrane obtained from the CUC/PVA was very effective for a selective separation of water from aqueous organic solution by Pervaporation technique. The composite membrane showed very stable permeation and separation characteristics in the experimental temperature range. The activation energies for pervaporation were 27.85(25.95), 34.20(29.68), and 35.59(39.11) kl/mole for the 75, 85, and 90wt% ethanol(acetic acid) concentrations, respectively. The permeation rates of the membrane for the water-organic solvent mixture systems at 60'S were in the range 0.1∼1.4kg/m2/hr and the separation factor was between 12 and 1925. The best pervaporation performance, the highest value of PSI, was 0.36kg/m2/hr for an aqueous 90wt% ethanol at 60℃.

Preparation and Permselectivity Characteristics of $CMC-Na^+/PAA-Li^+$ Composite Membrane for Binary Mixture Systems (이성분 혼합계에 대한 $CMC-Na^+/PAA-Li^+$ 복합막의 제조와 투과선택 특성)

  • 박희목;홍영기
    • Textile Science and Engineering
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    • v.33 no.10
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    • pp.898-904
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    • 1996
  • We prepared a CMC-Na+/PAA-Li+ type composite membrane in order to develop the new dehydration composite membrane having high selectivity and permeability. The new composite membrane was produced by casting CMC-(Na+) solution on the polyester nonwoven fabric and then casting PAA-(Li+) solution as the active separation layer on it. With the new composite membrane, we investigated the separation characteristics of n-propanol, iso-propanol, and ethanol aqueous solotions by pervaporation technique. The results obtained in this work are as follows The new composite membrane showed very stable permeation and separation characteristics in the range of experimental temperature. The activation energies for pervaporation were 7.88, 7.54, and 7.44 kcal/mol for the 80 wt% n-propanol, iso-propanol, and ethanol aqueous solution, respectively. The permeation rates of the composite membrane for 95 wt% alcohol aqueous solution at 6$0^{\circ}C$ were in the range 0.10~0.18 kg/$m^2$.hr and the value of separation factor was between 854 and 9856. The highest value of pervaporation separation index(PSI) which means the best pervaporation performance was 1900kg/$m^2$.hr for the 85~90 wt% iso-propanol aqueous solution at 6$0^{\circ}C$.

Composite Membrane Containing a Proton Conductive Oxide for Direct Methanol Fuel Cell

  • Peck, Dong-Hyun;Cho, Sung-Yong;Kim, Sang-Kyung;Jung, Doo-Hwan;Kim, Jeong-Soo
    • Journal of the Korean Electrochemical Society
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    • v.11 no.1
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    • pp.11-15
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    • 2008
  • The composite membrane for direct methanol fuel cell (DMFC) was developed using $H_3O^+-{\beta}"-Al_2O_3$ powder and perfluorosulfonylfluroride copolymer (Nafion) resin. The perfluorosulfonylfluroride copolymer (Nafion) resin was mixed with $H_3O^+-{\beta}"-Al_2O_3$ powder and it was made to sheet form by hot pressing. The electrodes were prepared with 60 wt% PtRu/C and 60wt% Pt/C catalysts for anode and cathode, respectively. The morphology and the chemical composition of the composite membrane have been investigated by using SEM and EDXA, respectively. The composite membrane and $H_3O^+-{\beta}"-Al_2O_3$ were analyzed by using FT-IR and XRD. The methanol permeability of the composite membranes was also measured by gas chromatography (GC). The performance of the MEA containing the composite membrane (2wt% $H_3O^+-{\beta}"-Al_2O_3$) was higher than that of normal pure Nafion membrane at high operating temperature (e.g. $110^{\circ}C$), due to the homogenous distribution of $H_3O^+-{\beta}"-Al_2O_3$, which decreased the methanol permeability through the membrane and enhanced the water contents in the composite membrane.

A Study on Carbon Dioxide Removal Process Using Composite Membrane in DME Production Process (DME 생산공정에서 복합막을 이용한 이산화탄소 제거공정 전산모사)

  • Noh, Sang-Gyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.7
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    • pp.4698-4706
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    • 2014
  • In this study, the simulation was performed for the CO removal process using a composite membrane in DME production. The composite membrane, PEI-PDMS (polyetherimide- polydimethyl siloxane) manufactured by Airrane Co. Ltd., was used in the modeling through a commercial simulation design program, PRO/II with PROVISION 9.2 by Invensys. To simulate the process, the permeability constants of each of the pure component from Airrane Co. Ltd. were determined by regression analysis from the experimental data. The required separation membrane area and utility cost in the CO removal process were obtained using a chemical process simulator and composite membrane with a compatible permeability constant.

A Study on the Preparation of Thin-Film Composite Membrane with Polyethersulfone Supporting Membrane (역삼투 복합막 제조(II) 폴리에테르설폰막의 제조와 복합막 제조에 관한 연구)

  • 이동진;민병렬;이병철;송희열
    • Membrane Journal
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    • v.4 no.1
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    • pp.46-56
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    • 1994
  • The performane of prepared Thin-Film Composite membrane depends on supporting membrane, concentration of monomers, dipping time of supporting membrane into monomer solution, reachon time between monomers, curing temperature and time and posttreatment. This study was conducted for searching the optimal condition for making the composite membrane. For this purpose, supporting membrane and composite membrane was made under various condition and at each step were tested.

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Application of Low Temperature Plasma Treatment to the Fabrication of Thin Film Composite Membrane (저온 플라즈마 공정의 복합막 제조에의 응용)

  • 김현일;김성수;전배혁
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.120-122
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    • 1998
  • 현재 상업화되어있는 RO membrane으로는 크게 asymmetric membrane과 composite membrane으로 구분될 수 있다. Asymmetric membrane의 소재로는 Cellulose acetate나 Cellulose triacetate와 같은 것들이 사용되며 현재에도 많이 사용되고 있으나, 보다 더 우수한 성능을 갖는 분리막을 제조하기 위해 현재에는 주로 composite membrane 형태로 제조된다. 대부분의 composite membrane은 계면중합에 의해 제조되는데 대표적인 membranem으로는 FT-30이 있다. 이 밖에도 support의 표면을 직접 플라즈마 처리하여 복합막을 제조하는 공정이 있으며 polyactrylonitrile과 같은 membrane이 이에 속한다. 플라즈마 처리된 복합막은 처리 대상에 크게 영향을 받지 않고 support 표면에 crosslinking의 형태로 형성되기 때문에 active layer가 매우 안정하며 따라서 우수한 물리화학적 성질을 기대할 수 있다. 이밖에도 분리막 표면을 친수성 단량체로 플라즈마 처리함으로써 분리막 표면에 친수성을 부여하거나 관능기를 도입함으로써 불활성 표면을 활성화 시킬 수도 있는 등의 여러가지 장점을 가지고 있다.

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Photovoltaic Performance of Dye-sensitized Solar Cells assembled with Hybrid Composite Membrane based on Polypropylene Non-woven Matrix

  • Choi, Yeon-Jeong;Kim, Dong-Won
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.605-608
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    • 2011
  • Hybrid composite membranes were prepared by coating poly(ethylene oxide) and $SiO_2$ particles onto the porous polypropylene nonwoven matrix. Gel polymer electrolytes prepared by soaking the hybrid composite membranes in an organic electrolyte solution exhibited ionic conductivities higher than $1.1{\times}10^{-3}Scm^{-1}$ at room temperature. Dyesensitized solar cell (DSSC) employing the hybrid composite membrane with PEO and 10 wt % $SiO_2$ exhibited an open circuit voltage of 0.77 V and a short circuit current of 10.78 $mAcm^{-2}$ at an incident light intensity of 100 $mWcm^{-2}$, yielding a conversion efficiency of 5.2%. DSSC employing the hybrid composite membrane showed more stable photovoltaic performance than that of the DSSC assembled with liquid electrolyte.

Phenol removal by tailor-made polyamide-fly ash composite membrane: Modeling and optimization

  • Vandana, Gupta;Anandkumar, J.
    • Membrane and Water Treatment
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    • v.10 no.6
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    • pp.431-440
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    • 2019
  • A novel composite membrane was synthesized using crosslinked polyamide and fly ash ceramic substrate for phenol removal. Glutaraldehyde was used as crosslinker. Characterization shows that synthesized membrane possesses good permeability ($0.184l.m^{-2}.h^{-1}.kPa^{-1}$), MWCO (1.7 kDa), average pore size (1.08 nm) and good chemical stability. RSM was adopted for phenol removal studies. Box-Behnken-Design using quadratic model was chosen for three operating parameters (feed phenol concentration, pH and applied pressure) against two responses (phenol removal, flux). ANOVA shows that model is statistically valid with high coefficient of determination ($R^2$)value for flux (0.9897) and phenol removal (0.9302). The optimum conditions are obtained as pH 2, $46mg.l^{-1}$ (feed phenol concentration) and 483 kPa (applied pressure) with 92.3% phenol removal and $9.2l.m^{-2}.h^{-1}$ flux. Data validation with deviation of 4% confirms the suitability of model. Obtained results reveal that prepared composite membrane can efficiently separate phenol from aqueous solution.

Separation of $H_2$/$N_2$ Gas Mixture by PTMSP/PDMS-PEI Composite Membrane (PTMSP/PDMS-PEI 복합막에 의한 수소/질소 혼합기체 분리)

  • Kang Tae-Bum;Hong Se-Lyung
    • Membrane Journal
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    • v.14 no.4
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    • pp.298-303
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    • 2004
  • PTMSP/PDMS-PEI composite membrane was prepared by solution casting method. To investigate the characteristics of this membrane, the analytical methods such as FT-IR, $^1$H-NMR, DSC, TGA, GPC, and SEM have been utilized. The number-average((equation omitted)) and weight-average((equation omitted)) molecular weight of PTMSP/PDMS copolymer were 501,516 and 675,560 respectively. The separation of the gas mixture($H_2$/$N_2$) through the composite membrane was studied as a function of pressure. The separation factor($\alpha$, $\beta$, (equation omitted)) of the composite membrane used in this work increased as the pressure of permeation cell increased. The real separation factor($\alpha$), head separation factor($\beta$), and tail separation factor ((equation omitted)) of PTMSP/PDMS-PEI composite membrane were 21.50, 49.14 and 1.84 respectively at $\Delta$P 345.55 kPa and $25^{\circ}C$.

Preparation and Performance of Composite Membrane Prepared by Layer-by-Layer Coating Method (Layer-by-Layer 코팅법을 적용한 복합막 제조와 투과성능 평가)

  • Jeon, Yi Seul;Rhim, Ji Won
    • Membrane Journal
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    • v.25 no.6
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    • pp.538-546
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    • 2015
  • In this study, composite membrane is prepared by Layer-by-Layer method using hydrophobic polymer as a coating material on the polysulfone support. The existence of coating layer on the surface and cross section was confirmed by the scanning electronic microscopy. The flux and rejection of the resulting membranes were characterized using 100 ppm NaCl feed solution. PVSA, PEI, PAA, PSSA, PSSA_MA were used as a coating polymer in this study. The composite membrane prepared by using 8,000 ppm PAA solution (Ion strength = 0.35, Coating time = 3 min) and 10,000 ppm PEI solution (Coating time = 4 min). As a result, PAA-PEI composite membrane showed flux of 101 LMH and salt rejection of 66.7%. The composite membrane showed the comparable performance as good as NE 4040-70 (Flux = 30 LMH, Rejection = 40~70%) model produced by Toray Chemical co.