• Title/Summary/Keyword: Gas Permeation

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Preparation and Characterization of α-alumina Hollow Fiber Membrane (알루미나 중공사막 제조 및 특성 분석)

  • Che, Jin Woong;Lee, Hong Joo;Park, Jung Hoon
    • Membrane Journal
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    • v.26 no.3
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    • pp.212-219
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    • 2016
  • The alumina hollow fiber membranes were prepared by spinning and sintering a polymer solution containing suspended alumina powders. For determine pore structure of hollow fiber membranes formed by different solvent-nonsolvent interaction rate, dimethylsulfoxide (DMSO), dimethylacetamide (DMAc), triethylphosphite (TEP) were prepared in dope solution by solvent, polyethersulfone (PESf) and polyvinylpyrrolidone (PVP) were used as a polymer binder and additive. The pore structure of hollow fiber membranes was characterized using scanning electron microscope (SEM). The alumina hollow fiber membranes prepared by DMSO, DMAc were had the asymmetric structure mixed sponge-like and finger-like morphology, while TEP solvent were had single sponge-like structure. The prepared hollow fiber membranes were analyzed gas permeation and mechanical strength experiment also. The hollow fiber membrane having single sponge-like structure was had high gas permeation performance. On the contrary to this, more finger-like morphology was less gas permeation performance.

Separation Characteristics of $CH_4-CO_2$ Gas Mixture through Hollow Fiber Membrane Module (Hollow Fiber 막모듈을 이용한 $CH_4-CO_2$ 혼합기체의 분리특성)

  • Kim, Jin-Soo;Ahn, June-Shu;Lee, Sung-Moo
    • Membrane Journal
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    • v.4 no.4
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    • pp.197-204
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    • 1994
  • In this study, permeation characteristics of pure $CH_4,\;CO_2$ and $CH_4/CO_2$ gas mixture were examined by permeation experiments through hollow fiber membrane module and experimental results were compared with simulation results. Permeation rate of pure gas increased with increaseing temperature in Arrhenius type. Activation energy was 6.61 kJ/mol for $CO_2$ and 25.26 kJ/mol for $CH_4$. In the permeation experiment of gas mixture, permeate flow rate and $CO_2$ concentration in permeate decreased and $CH_4$ concentration in reject increased with the increase of cut. Separation factor was in the range of 20~40 at 5~20 atm and 20% cut and it increased with pressure and against temperature Experimental values corresponded to numerical values with the deviation of 8% in permeate flow rate and $CO_2$ concentration in permeate and 15% in $CO_2$ concentration in reject.

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Fabrication and Hydrogen Permeation Properties of $V_{99.8}B_{0.2}$ Alloy Membrane for Hydrogen Separation (수소 분리를 위한 $V_{99.8}B_{0.2}$ 분리막의 제조와 수소투과특성)

  • Jung, Yeong-Min;Jeon, Sung-Il;Park, Jung-Hoon
    • Membrane Journal
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    • v.21 no.4
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    • pp.345-350
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    • 2011
  • No investigation has yet been accomplished to screen the boron-doped effects on vanadium based metal membranes. The synthesis, hydrogen permeation properties and chemical stability of a novel Pd-coated $V_{99.8}B_{0.2}$ alloy membrane are presented in this report. Hydrogen permeation experiments have been performed to investigate the hydrogen transport properties through the Pd-coated $V_{99.8}B_{0.2}$ alloy membrane in the absolute pressure range 1.0~3.0 bar under pure hydrogen, hydrogen-carbon dioxide gas mixture at $400^{\circ}C$. The maximum hydrogen permeation flux was $48.5mL/min/cm^2$ for a 0.5 mm thick membrane under pure hydrogen. This results offer new direction in the synthesis of novel non-Palladium-based metal membranes for hydrogen separation in water-gas shift reaction.

Gas Permeation of Y2O3-SiC Composite Membrane

  • Song, Daheoi;Jung, Miewon
    • Journal of the Korean Ceramic Society
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    • v.52 no.4
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    • pp.234-236
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    • 2015
  • $Y_2O_3$-SiC composite membrane was dip-coated using $Y_2O_3$ sol solution; this membrane was compared with a non- coated one. Each membrane was characterized by XRD, FE-SEM and BET techniques. Hydrogen and CO permeation were tested with self-manufactured Sievert's type equipment. $Y_2O_3$ coating was enhanced for the selectivity of the membrane ($H_2$ versus CO). The hydrogen permeation was measured at 1 bar with increasing temperatures. In case of the coated membrane, hydrogen permeation was found to be $1.24{\times}10^{-7}mol/m^2sPa$ with perm-selectivity of 4.26 at 323 K.

Modelling and Simulation of H2 separation in Pd Membrane System with Co-current and Current-current Flow (병류와 향류 흐름에서 수소분리를 위한 Pd 분리막 시스템의 모델링 및 모사)

  • Yi, Yong;Noh, Seunghyo;Oh, Min
    • Korean Chemical Engineering Research
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    • v.48 no.5
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    • pp.598-602
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    • 2010
  • In this paper, we carried out CFD modelling and simulation for the membrane system to separate H2 gas from the multi-component feed gas. The membrane system is of the annulus tubular type consisting of the external lumen side for the feed gas and the internal permeation side for the sweeping gas. The operating temperature and pressure of the lumen side inlet flow are $374^{\circ}C$ and 7 bar respectively and those of the sweeping gas are $374^{\circ}C$ and 3 bar, and considering these conditions, Pd membrane system was employed. CFD simulations were performed for the co-current flow and counter-current flow membrane system based on the flow directions between the feed and the sweeping gas. Comparisons and discussions were made for the H2 partial pressure, H2 mole fraction and H2 flux for both cases. Furthermore, we executed CFD simulations for the each case of the various inlet flow rates of the feed gas at the lumen side. Accordingly, we reviewed the effects of the flow rate and residence time on the performance of the membrane system.

Mechanisms of Gas Permeation through Microporous Membranes - A Review (미세 다공막을 통한 기체 투과기구)

  • 황선탁
    • Membrane Journal
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    • v.7 no.1
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    • pp.1-10
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    • 1997
  • A review is presented for various gas transport mechanisms through microporous membranes of both polymeric and inorganic materials. Different transport modes manifest depending on the pore size and the flow regime, which is a function of pressure, temperature, and the interaction between gas molecules and the pore walls. For microporous membranes whose pores are small and the internal surface area huge, the surface diffusion becomes a significant factor. If the pores become even smaller, then the transport mechanism will be more of an activated diffusion type. When conditions are right capillary condensation will take place to create an enormous capillary pressure gradient, which will greatly enhance the permeation flux. At the same time the capillary condensate of the heavier component may block the membrane pores denying the passage of the lighter gas molecules. All of these phenomena will influence the separation of mixtures.

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The Correlation between Gas Transport Properties and Physical Properties of Modified Polysulfones (변형 폴리술폰의 기체 투과 성질과 물리적 성질의 상관관계)

  • ;;;;;Guiver, Michael D.;R
    • Proceedings of the Membrane Society of Korea Conference
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    • 1997.10a
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    • pp.67-68
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    • 1997
  • 1. Introduction : Gas transport through dense polymeric membranes is predominantly determined by the chain packing density as well as the chain flexibility. Thus, improved permeation properties can be obtained by controlling these two factors. In this work, the introduction of bulky substituents was attempted to improve permeation properties. Polysulfone, widely used material for gas separation membrane, was the starting material of this modification. Gas transport properties of resulting modified polysulfones were examined, and the improved properties were explained by probing the change of physical properties.

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Mechanisms of gas permeation through microporous membranes - A review

  • Hwang, Sun-Tak
    • Proceedings of the Membrane Society of Korea Conference
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    • 1995.09a
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    • pp.1-13
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    • 1995
  • A review is presented for various gas tranport mechanisms through microporous membranes of both polymeric and inorganic materials. Different transport modes manifest depending on the pore size and the flow regime, which is a function of pressure, temperature, and the inateraction between gas molecules and the pore walls. For microporous membranes whose pores are small and the intenal surface area huge, the surface diffusion becomes a significant factor. If the pores become even smaller, them the transport mechanism will be more of an activated diffusion type. When conditions are right capillary condensation will take place to create an enormous capillary pressure gradient, which will greatly enhance the permeation flux. At the same time the capillary condensate of the heavier component may block the membrane pores denying the passage of the lighter gas molecules. All of these phenomena will influence the separation of mixtures.

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A Molecular Dynamics Study on the Gas Permeation of Glassy Polymer

  • Goo, Hyung Seo;Kim, In Ho;Ha, SeongYong;Cho, Dae Myeong;Rhim, Ji Won;Nam, SangYong
    • Korean Membrane Journal
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    • v.6 no.1
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    • pp.30-36
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    • 2004
  • The gas permeation performance of commercially available polyetherimide (Ultem$\^$/) is simulated by means of molecular dynamics methods. By the observation of trajectory, long distance hopping of gas molecules is needed to transverse from top to bottom of membrane. Two possibilities mechanism of diffusion phenomena through glassy polymers can be issued. Diffusion coefficients were calculated by Einstein relation equation. In solubility simulation, the value of the constants C'$\_$H/ and b for O$_2$ at 300 K were calculated. The diffusion and solubility coefficient of He for PEI were simulated in this simulation work. the permeability coefficient is 9.88 Barrer. This value is closed to experimental value of 9.4 Barrer.