• Title/Summary/Keyword: hydrogen separation membrane

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STATUS OF MEMBRANE TECHNOLOGY IN KOREA

  • Im, Hoagy-K;Won, Jang-mook
    • Proceedings of the Membrane Society of Korea Conference
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    • 1999.07a
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    • pp.3-7
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    • 1999
  • Government efforts on membrane technology started in early 1980 with Membrane Development Program supported by the Ministry of Science and Technology. Several independent research projects on liquid separation, gas separation, hollow fiber producing program etc. were carried out during the 1980s. The RaCER was commissioned by MOCI for the general management of the project which had its aims in establishing the base for developing membranes, modules and systems for liquid separation in August 1993. More recently, in June 1995, a program for developing membranes for oxygen separation, nitrogen separation and hydrogen separation was initiated. This paper outlines the brief history of membrane technology development in Korea from the introduction of membrane filtration technology during the late 1960s to present.

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$Ba(Zr_{0.85}Y_{0.15})O_{3-\delta}$-NI Composite Membrane for Hydrogen Separation by Aerosol Deposition Method (에어로졸 증착법(Aerosol Depostion method)에 의한 $Ba(Zr_{0.85}Y_{0.15})O_{3-\delta}$-NI 수소분리막 제조)

  • Park, Young-Soo;Choi, Jin-Sub;Byoun, Myoung-Sub;Kim, Jin-Ho;Hwang, Kwang-Taek
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.4
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    • pp.271-277
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    • 2010
  • $(Ba(Zr_{0.85}Y_{0.15})O_{3-\delta})$ oxide, showing high protonic conductivity at high temperatures and good chemical stability with $CO_2$ are referred to as hydrogen separation membrane. For high efficiency of hydrogen separation ($H_2$ flux and selectivity) and low fabrication cost, ultimate thin and dense BZY-Ni layer has to be coated on a porous substrate such as $ZrO_2$. Aerosol depostion (AD) process is a novel technique to grow ceramic film with high density and nano-crystal structure at room-temperature, and may be applicable to the fabrication process of AD integration ceramic layer effectively. XRD, SEM, X-ray mapping measurements were conducted in order to analyze the characteristics of BZY-Ni membrane fabricated by AD process. it is observed that it is homogeneous distribution for BZY-Ni. The result of $H_2$ permeation rate suggests that BZY-Ni composite is higher than BZY.

Fabrication of Pd/YSZ Cermet Membrane for Hydrogen Separation (수소 분리를 위한 Pd/YSZ Cermet 분리막의 제조)

  • Jeon, Sung-Il;Park, Jung-Hoon;Lee, Yong-Taek
    • Membrane Journal
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    • v.21 no.2
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    • pp.148-154
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    • 2011
  • Metal-ceramic composite membrane have been developed to separate hydrogen from mixed gases, particularly product streams generated during coal gasification and methane reforming. Cermet membrane was fabricated with palladium as hydrogen-permeable metal and $Y_2O_3$-stabilized $ZrO_2$ (YSZ) as ceramic supporter. As-prepared membrane showed dense structure with continuous channel of palladium. The hydrogen flux of Pd/YSZ membrane have been measured in the range of 0.5~2 atm with 100% hydrogen gas. The results indicate that the hydrogen flux was 0.333 mL/$min{\cdot}cm^2$ at $450^{\circ}C$ and 2 atm. The crack was formed in the surface and cross-section of membrane.

CFD Simulation of Pd-Ag Membrane Process for $CO_2$ Separation (이산화탄소 분리를 위한 Pd-Ag 분리막 공정의 CFD 모사)

  • Oh, Min;Park, Junyong;Noh, Seunghyo;Hong, Seong Uk
    • Applied Chemistry for Engineering
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    • v.20 no.1
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    • pp.104-108
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    • 2009
  • In this study, for the flow of carbon dioxide/hydrogen mixture through a tubular type Pd-Ag membrane, hydrogen partial pressure, velocity profile, and concentration profile were simulated as a function of inlet flow rate using computational fluid dynamics (CFD) technique. The simulation results indicated that the mole fraction of carbon dioxide increased slowly in the longitudinal direction as the flow rate increased. In addition, the effects of inlet flow rate and the length of membrane on hydrogen recovery were investigated. At lower flow rate and for longer membrane, the hydrogen recovery was larger.

Vapor Permeation Separation of MTBE-Methanol Mixtures Using Cross-linked PVA Membranes (가교된 PVA 막을 이용한 MTBE/methanol 혼합물의 증기투과(Vapor Permeation)분리)

  • 김연국;임지원
    • Membrane Journal
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    • v.10 no.3
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    • pp.148-154
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    • 2000
  • Poly(vinyl alcohol)(PVA)/sulfur-siccinic acid(SSA) membrane performances have been studied for the vapor permeation separation of methyl tort-butyl ether(MTBE)/methanol mixtures with varying operation temperatures, amount of cross-linking agents, and feed compositions. 1'here are two factors, the membrane network and the hydrogen bonding, in the swelling measurements of PVA/SSA membranes. These two factors act interdependently on the membrane swelling. The sulfuric acid group in SSA took an important role in the membrane performance. The cross-linking effect might be more dominant than the hydrogen bonding effect due to the sulfuric acid group at 7% SSA membrane. Hydrogen bonding effect was more important for 5% SSA membrane. In vapor permeation, density or concentration of methanol in vapor feed is lower than that of methanol in liquid feed, as a result, the hydrogen bonding portion between the solvent and the hydroxyl group in PVA is reduced in vapor permeation. In this case, the 7% SSA membrane shows the highest separation factor of 2187 with the flux of 4.84g/$m^2$hr for MTBE/methanol=80/20 mixtures at 3$0^{\circ}C$.

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Fabrication and Stability of Pd Coated Ta/YSZ Cermet Membrane for Hydrogen Separation (Pd 코팅된 Ta/YSZ 수소분리막의 제조 및 안정성)

  • Lee, Sang-Jin;Jeon, Sung-Il;Park, Jung-Hoon
    • Membrane Journal
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    • v.20 no.1
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    • pp.69-75
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    • 2010
  • Cermet membrane was fabricated with tantalum as hydrogen-permeable metal and $Y_2O_3$-stabilized $ZrO_2$ (YSZ) as ceramic supporter. Ta/YSZ cermet membrane was prepared through pre-sintering in He atmosphere and then main sintering under high vacuum and the impurities to originate from sintering and brazing could be removed by mechanical polishing. As-prepared membrane showed dense structure with continuous channel of tantalum. Hydrogen permeation experiment was conducted in the region of $200{\sim}350^{\circ}C$ using Ta/YSZ membrane coated with Pd for hydrogen dissociation. The crack in membrane was formed at $300^{\circ}C$ and the Pd coating layer has flaked off in spots. XRD results showed that tantalum reacted with hydrogen to form $Ta_2H$. The lattice expansion by $Ta_2H$ caused deterioration for membrane.

MEMBRANE-BASED GAS AND VAPOR SEPARATIONS

  • Wijmans, Hans
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.05a
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    • pp.3-6
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    • 2004
  • Industrial gas separation by membranes began in 1980 with the introduction of hollow-fiber polysulfone membrane systems by Permea, at that time a division of Monsanto. This first application was the recovery of hydrogen from ammonia reactor purge gas and was soon followed by the generation of nitrogen from air. Today, membrane gas separation ranks second behind cryogenic distillation in terms of nitrogen production, and this application has drawn the industrial gas companies into the membrane field.(omitted)

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Improvement of the Thermochemical water-splitting IS Process Using the Membrane Technology (분리막 기술을 이용한 열화학적 수소제조 IS[요오드-황] 프로세스의 개선)

  • Hwang, Gab-Jin;Kim, Jong-Won;Sim, Kyu-Sung
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.3
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    • pp.249-258
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    • 2002
  • Thermochemical water-splitting IS(Iodine-Sulfur) process has been investigating for large-scale hydrogen production. For the construction of an efficient process scheme, two kinds of membrane technologies are under investigating to improve the hydrogen producing HI decomposition step. One is a concentration of HI in quasi-azeotropic HIx ($HI-H_2O-I_2$) solution by elecro-electrodialysis. It was confirmed that HI concentrated from the $HI-H_2O-I_2$ solution with a molar ratio of 1:5:1 at $80^{\circ}C$. The other is a membrane reactor to enhance the one-pass conversion of thermal decomposition reaction of gaseous hydrogen iodide (HI). It was found from the simulation study that the conversion of over 0.9 would be attainable using the membrane reactor using the gas permeation properties of the prepared silica hydrogen permselective membrane by chemical vapor deposition (CVD). Design criterion of the membrane reactor was also discussed.

Hydrogen purification using membrane reactors

  • Barbieri, Giuseppe;Bernardo, Paola;Drioli, Enrico;Lee, Dong-Wook;Sea, Bong-Kuk;Lee, Kew-Ho
    • Proceedings of the Membrane Society of Korea Conference
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    • 2003.07a
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    • pp.21-24
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    • 2003
  • Methane steam reforming (MSR) was studied in a membrane reactor (MR) with a Pd-based and a porous alumina membranes. MRs showed methane conversion higher than that foresaw by the thermodynamic equilibrium for a traditional reactor (TR). Silica membranes prepared at KRICT were characterized with permeation tests on single gases ($N_2$, $H_2$ and $CH_4$). These silica membranes can be also used for high temperature applications such as $H_2$ separation $CO_2$ hydrogenation for methanol production is another reaction where $H_2O$ selective removal can be performed with these silica membranes.

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Development of High Pressure Membrane-Based Associated Gas Separation System for DME Synthesis (DME 합성을 위한 고압 유휴가스 분리용 Membrane 시스템 개발)

  • Kim, Hackeun;Bae, Myongwon;Lee, Sangjin;Ha, Seongyong;Lee, Chungseop;Mo, Yonggi
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.1
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    • pp.45-53
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    • 2015
  • The objective of this study is to develop a gas pro-treatment system for DME synthesis, wherein this system separates $CO_2$ from Flaring gas as Membrane, in order to save raw material ($CH_4$) cost of DME. In this study, hollow fiber membrane is developed, which is able to separate high-pressure gas, supported by polysulfone and coated with amorphous fluorinated polymer. Throughout the evaluation of the membrane's separation characteristics, the membrane is applied to this system. The membrane is designed by 2 stages for over 90% removal rate of $CO_2$ and over 90% recovery rate of $CH_4$. The bench scale of pro-treatment system is developed as $25Nm^3/hr$.