• Title/Summary/Keyword: Hydrogen Separation

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Synthesis of Molecularly Imprinted Polymers for Chiral (S)-Ibuprofen and Their Molecular Recognition Mechanism (키랄(S)-이부푸로펜 함유 고분자의 합성과 제조된 고분자의 분자 인식 메카니즘)

  • Huangfu, Fengyun;Wang, Bing;Sun, Yan
    • Polymer(Korea)
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    • v.37 no.3
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    • pp.288-293
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    • 2013
  • A group of molecularly imprinted polymers (MIPs) with specific recognition for chiral (S)-ibuprofen were successfully prepared based on hydrogen bonds, utilizing ${\alpha}$-methacrylic acid as a functional monomer. The IR analysis of MIPs showed that the blue- and red-shifted hydrogen bonds were formed between templates and functional monomers in the process of self-assembly imprinting and re-recognition, respectively. According to UV-Vis analysis, we found that the ratio of host-guest complexes between template molecule and functional monomer was 1:1. The effect of cross-linker's quantity on the polymerization was studied by transmission electron microscope (TEM). The adsorption selectivity experiments indicated that MIPs exhibited higher selectivity to (S)-ibuprofen than those to ketoprofen and (R)-ibuprofen, (S)-ibuprofen's structural analogs.

The Synthesis and Pore Property of Hydrogen Membranes Derived from Polysilazane as Inorganic Polymer (무기 고분자인 폴리실라잔을 이용한 수소 분리막의 합성 및 기공특성)

  • Kwon, Il-Min;Song, In-Hyuck;Park, Young-Jo;Lee, Jae-Wook;Yun, Hui-Suk;Kim, Hai-Doo
    • Journal of the Korean Ceramic Society
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    • v.46 no.5
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    • pp.462-466
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    • 2009
  • We investigated the pore properties of inorganic membranes applied for hydrogen separation industry. Inorganic membranes were derived from polysilazanes. The thermal reactions involved were studied using thermogravimetry(TG) and IR spectroscopy(FTIR) of the solids. To determine the thermal effect of pore properties, polysilazanes were pyrolysed in inert atmosphere. Pore volume and BET surface area showed the maximum value at a pyrolysis temperature of $500^{\circ}C$. For amorphous SiCN membrane derived from polysilazanes, selectivity of $H_2/N_2$ was 4.81 at $600^{\circ}C$.

Application of nanoparticles in extending the life of oil and gas transmission pipeline

  • Yunye, Liu;Hai, Zhu;Jianfeng, Niu
    • Structural Engineering and Mechanics
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    • v.84 no.6
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    • pp.733-741
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    • 2022
  • The amount of natural gas that is used on a worldwide scale is continuously going up. Natural gas and acidic components, such as hydrogen sulfide and carbon dioxide, cause significant corrosion damage to transmission lines and equipment in various quantities. One of the fundamental processes in natural gas processing is the separation of acid gases, among which the safety and environmental needs due to the high toxicity of hydrogen sulfide and also to prevent wear and corrosion of pipelines and gas transmission and distribution equipment, the necessity of sulfide separation Hydrogen is more essential than carbon dioxide and other compounds. Given this problem's significance, this endeavor aims to extend the lifespan of the transmission lines' pipes for gas and oil. Zinc oxide nanoparticles made from the environmentally friendly source of Allium scabriscapum have been employed to accomplish this crucial purpose. This is a simple, safe and cheap synthesis method compared to other methods, especially chemical methods. The formation of zinc oxide nanoparticles was shown by forming an absorption peak at a wavelength of about 355 nm using a spectrophotometric device and an X-ray diffraction pattern. The size and morphology of synthesized nanoparticles were determined by scanning and transmission electron microscope, and the range of size changes of nanoparticles was determined by dynamic light scattering device.

Control of Nano-Structure of Ceramic Membrane and Its Application (세라믹 멤브레인의 나노구조 제어 및 응용)

  • Lee, Hye-Ryeon;Seo, Bong-Kuk;Choi, Yong-Jin
    • Membrane Journal
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    • v.22 no.2
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    • pp.77-94
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    • 2012
  • Amorphous ceramic membranes have been developed for gas phase separation and liquid phase separation (water treatment, wastewater treatment and separation of organic solvent or compounds) because of their thermal stability and solvent resistance. In this paper, ceramic membranes were categorized by membrane pore size and materials, and summarized for hydrogen separation, carbon dioxide separation, membrane reactor, pervaporation and water treatment with membrane structure and properties.

Hydrogen Permselective Membrane using the Zirconia Coated Support (지르코니아 코팅 지지체를 이용한 수소분리막)

  • Choi, Ho-Sang;Ryu, Cheol-Hwi;Hwang, Gab-Jin
    • Membrane Journal
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    • v.20 no.3
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    • pp.210-216
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    • 2010
  • The hydrogen permselective membrane were prepared by chemical vapor deposition (CVD) aiming at the applications to hydrogen iodide decomposition in the thermochemical IS process, and it was evaluated for the possibility as a separation membrane. An electron probe X-ray microanalyzer (EPMA) and SEM picture were used to analyze the morphology and structure of the prepared membranes. It was confirmed that Zr-Si-O layer exist in the surface of the prepared membrane using zirconia coated support. Single-component permeance to $H_2$ and $N_2$ were measured at $300{\sim}600^{\circ}C$. Hydrogen permeance through the Z-1 membrane at a permeation temperature of $600^{\circ}C$ was about $1{\times}10^{-7}\;mol{\cdot}Pa^{-1}{\cdot}m^{-2}{\cdot}s^{-1}$. The selectivities of $H_2/N_2$ at $600^{\circ}C$ were 5.0 and 5.75 for Z-1 and Z-2 membrane, respectively.

Storage and Delivery of Hydrogen Isotopes (삼중수소 저장기술)

  • Chung, Hong-Suk;Chung, Dong-You;Koo, Dae-Seo;Lee, Ji-Sung;Shim, Myung-Hwa;Cho, Seung-Yon;Jung, Ki-Jung;Yun, Sei-Hun
    • Journal of Hydrogen and New Energy
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    • v.22 no.3
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    • pp.372-379
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    • 2011
  • A nuclear fusion fuel cycle plant is composed of various subsystems such as a hydrogen isotope storage and delivery system, a tokamak exhaust processing system, and a hydrogen isotope separation system. Korea shares in the construction of its ITER fuel cycle plant with the EU, Japan, and the US, and is responsible for the development and supply of the storage and delivery system. The authors thus present details on the development status of hydrogen isotope storage technologies for nuclear fusion fuel cycle plants. We have developed various hydride beds of different size. We have realized a hydrogen delivery rate of 12.5 $Pam^3/s$ with a typical 1242g-ZrCo bed.

Hydrogen Permeation Properties of $(Ni_{60}-Nb_{40})_{95}-Pd_5$ Amorphous Metallic Membrane ($(Ni_{60}-Nb_{40})_{95}-Pd_5$ 비정질 금속막의 수소투과 특성)

  • Lee, Dock-Young;Kim, Yoon-Bae
    • Journal of Hydrogen and New Energy
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    • v.19 no.4
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    • pp.359-366
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    • 2008
  • Hydrogen as a high-quality and clean energy carrier has attracted renewed and ever-increasing attention around the world in recent years, mainly due to developments in fuel cells and environmental pressures including climate change issues. In this processes for hydrogen production from fossil fuels, separation and purification is a critical technology. $(Ni_{60}-Nb_{40})_{95}-Pd_5$ alloy ingots were prepared by arc-melting the mixture of pure metals in an Ar atmosphere. Melt-spun ribbons were produced by the single-roller melt-spinning technique in an Ar atmosphere. Amorphous structure and thermal behavior were characterized by XRD and DSC. The permeability of the $(Ni_{60}-Nb_{40})_{95}-Pd_5$ amorphous alloy membrane was characterized by hydrogen permeation experiments in the temperature range 623 to 773 K and pressure of 2 bars. The maximum hydrogen permeability was $3.54{\times}10^{-9}[mol{\cdot}m^{-1}s^{-1}{\cdot}pa^{-1/2}]$ at 773 K for the $(Ni_{60}-Nb_{40})_{95}-Pd_5$ amorphous alloy.

The Effect of SO2-O2 Mixture Gas on Phase Separation Composition of Bunsen Reaction with HIx solution (HIx 용액을 이용한 분젠 반응에서 상 분리 조성에 미치는 SO2-O2 혼합물 기체의 영향)

  • Han, Sangjin;Kim, Hyosub;Ahn, Byungtae;Kim, Youngho;Park, Chusik;Bae, Kikwang;Lee, Jonggyu
    • Journal of Hydrogen and New Energy
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    • v.23 no.5
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    • pp.421-428
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    • 2012
  • The Sulfur-Iodine (SI) thermochemical hydrogen production process is one of the most promising thermochemical water splitting technologies. In the integrated operation of the SI process, the $O_2$ produced from a $H_2SO_4$ decomposition section could be supplied directly to the Bunsen reaction section without preliminary separation. A $HI_x$ ($I_2+HI+H_2O$) solution could be also provided as the reactants in a Bunsen reaction section, since the sole separation of $I_2$ in a $HI_x$ solution recycled from a HI decomposition section was very difficult. Therefore, the Bunsen reaction using $SO_2-O_2$ mixture gases in the presence of the $HI_x$ solution was carried out to identify the effect of $O_2$. The amount of $I_2$ unreacted under the feed of $SO_2-O_2$ mixture gases was little higher than that under the feed of $SO_2$ gas only, and the amount of HI produced was relatively decreased. The $O_2$ in $SO_2-O_2$ mixture gases also played a role to decrease the amount of a impurity in $HI_x$ phase by only striping effect, while that in $H_2SO_4$ phase was hardly affected.

Evaluating the Efficacy of Commercial Polysulfone Hollow Fiber Membranes for Separating H2 from H2/CO Gas Mixtures (상용 폴리설폰 중공사막의 수소/일산화탄소 혼합가스 분리 성능 평가)

  • Do Hyoung Kang;Kwanho Jeong;Yudam Jeong;Seung Hyun Song;Seunghee Lee;Sang Yong Nam;Jae-Kyung Jang;Euntae Yang
    • Membrane Journal
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    • v.33 no.6
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    • pp.352-361
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    • 2023
  • Steam methane reforming is currently the most widely used technology for producing hydrogen, a clean fuel. Hydrogen produced by steam methane reforming contains impurities such as carbon monoxide, and it is essential to undergo an appropriate post-purification step for commercial usage, such as fuel cells. Recently, membrane separation technology has been gaining great attention as an effective purification method; in this study, we evaluated the feasibility of using commercial polysulfone membranes for biogas upgrading to separate and recover hydrogen from a hydrogen/carbon monoxide gas mixture. Initially, we examined the physicochemical properties of the commercial membrane used. We then conducted performance evaluations of the commercial membrane module under various conditions using mixed gas, considering factors such as stage-cut and operating pressure. Finally, based on the evaluation results, we carried out simulations for process design. The maximum H2 permeability and H2/CO separation factor for the commercial membrane process were recorded at 361 GPU and 20.6, respectively. Additionally, the CO removal efficiency reached up to 94%, and the produced hydrogen concentration achieved a maximum of 99.1%.