• 제목/요약/키워드: MEMBRANE TRANSPORT

검색결과 815건 처리시간 0.023초

Polyamide 역삼투막의 투과성능과 막 이동 모델의 해석 (Interpretation of Permeation Characteristics and Membrane Transport Models Through Polyamide Reverse Osmosis Membrane)

  • 김노원;김영길;이용택
    • 멤브레인
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    • 제14권1호
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    • pp.75-84
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    • 2004
  • 폴리아미드계 역삼투 분리막의 투과성능을 비교하기 위하여 NaCl과 NaOCl을 함유하는 혼합용액을 공급수로 사용하여 연속운전과 단속운전 하에서 실험하여 보았다. 이 결과를 가지고 막 이동 모델의 선택적 적용이 가능함을 제시하고자 하였으며 투과 성능 분석 결과, 용액 확산 모델과 선흡착-모세관이동 모델이 운전 모드에 따라 상대적으로 유용함을 볼수 있었다. 연속 운전에서는 선흡착-모세관이동 모델을, 단속 운전에서는 용액 확산 모델을 따름을 알 수 있었다 NaOCl에 의한 표면 변화를 SEM 사진을 통하여 확인 할 수 있었다. 연속운전 후의 막은 염소 투과 결과 표면에서 부분적인 ridge and valley 구조가 나타났으며 단속 운전 후의 막은 표면 전반에서 변성이 일어난 것을 볼 수 있었다.

Aspen Custom Modeler를 이용한 고분자전해질 연료전지 다중 물리 모델 개발 (Development of a Multi-Physics Model of Polymer Electrolyte Membrane Fuel Cell Using Aspen Custom Modeler)

  • 손혜영;한재수;유상석
    • 한국수소및신에너지학회논문집
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    • 제32권6호
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    • pp.489-496
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    • 2021
  • The performandce of polymer electrolyte membrane fuel cell depends on the effective management of heat and product water by the electrochemical reaction. This study is designed to investigate the parametric change of heat management along the channel of polymer electrolyte membrane. The model was developed by an aspen custom modeler that it can solve differential equation with distretization model. The model can simulate water transport through the membrane electrolyte that is coupled with heat generation. In order to verify the model, it is compared with the experimental data. The water transport behavior is then evaluated with the simulation model.

Insight into Complexation of Olefin with Silver Ions Dissolved in Poly(n-butyl methacrylate)

  • Dongkyun Ko;Lee, Kyung-Min;Lee, Kwi-Jong;Kang, Yong-Soo
    • 한국막학회:학술대회논문집
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    • 한국막학회 2004년도 Proceedings of the second conference of aseanian membrane society
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    • pp.136-139
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    • 2004
  • Olefin/paraffin separation by the facilitated transport membrane using silver salts as carriers has been considered as a promising alternative to the conventional energy intensive distillation process. The basis for the separation is the ability of silver ions to react reversibly with olefin forming silver-olefin complexes.(omitted)

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A STUDY ON MEMBRANE TRANSPORT OF BRAZILIN USING PRIMARY CULTURED RAT HEPATOCYTES

  • Moon, Chang-Kiu;Park, Kwang-Sik;Kim, Seonh-Gon;Moon, Chang-Hyun
    • Toxicological Research
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    • 제7권2호
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    • pp.173-181
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    • 1991
  • Membrane transport of brazilin was investigated i primary cultured rat hepatocytes. Brazilin was transported into hepatocytes very slowly and reached plateau at about 60 minutes. Saturation of transport process was not observed and the transport was not affected by ouabain, metabolic inhibitors, and its structural analog. The amount of brazilin transported into hepatocytes was decreased when the environmental temperature was decreased. These results suggest that brazilin might be transported into hepatocytes by simple diffusional process.

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올레핀 촉진수송 나노복합체 분리막의 투과도 향상을 위한 iodine의 활용 (Utilization of Iodine for the Enhanced Permeance of Facilitated Olefin Transport Nanocomposite Membrane)

  • 최예지;이은용;강상욱
    • 멤브레인
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    • 제24권6호
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    • pp.448-452
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    • 2014
  • 올레핀/파라핀 분리 기술로 silver nanoparticles(AgNPs)를 운반체로 사용하여 보다 효과적으로 올레핀을 분리하는 고성능 올레핀 촉진수송 분리막을 제조하고자 하였다. 기존에 성능이 밝혀진 PVP/AgNPs/TCNQ 나노복합체 막에 추가적으로 할로겐 물질을 첨가하여 AgNPs의 표면을 더 양극화시킴으로써 성능을 향상시키고자 하였다. 제조한 용액을 TEM과 EDS로 분석해서 AgNPs의 형성과 iodine의 존재를 확인하였다. Propylene/propane 혼합기체의 분리 성능 실험을 통해 기존 PVP/AgNPs/TCNQ 나노복합체 분리막과 기체 분리 성능을 비교하였고, long-term stability 실험을 통해 분리막의 안정성을 조사하였다.

Olefin/Paraffin Separation though Facilitated Transport Membranes in Solid State

  • Hong, Seong-Uk;Won, Jong-Ok;Hong, Jae-Min;Park, Hyun-Chae;Kang, Yong-Soo
    • 한국막학회:학술대회논문집
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    • 한국막학회 1999년도 The 7th Summer Workshop of the Membrane Society of Korea
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    • pp.15-18
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    • 1999
  • A simple mathematical model for facilitated mass transport through a fixed site carrier membrane was derived by assuming an instantaneous, microscopic concentration (activity) fluctuation. The current model demonstrates that the facilitation factor depends on the extent of concentration fluctuation, the time scale ratios of diffusion to chemical reaction and the ratio of the carrier concentration to the solute solubility in matrix. The model was examined against the experimental data on oxygen transport in membranes containing metallo-porphyrin carriers, and the agreement was exceptional (within 10% error). The basic concept of this approach was applied to separate olefin from olefin/paraffin mixtures. A proprietaty carrier, developed here, resulted that the selectivity of propylene over propane was more than 120 and the propylene permeance exceed 40 gpu.

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촉진수송: 기본 개념 및 기체분리막 응용 (Facilitated Transport: Basic Concepts and Applications to Gas Separation Membranes)

  • 박철훈;이재훈;박민수;김종학
    • 멤브레인
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    • 제27권3호
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    • pp.205-215
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    • 2017
  • 고분자 분리막은 가격이 저렴하고, 쉽게 제조가 가능하며, 투과도와 선택도가 우수하여 수처리 분야뿐만 아니라 기체분리에서도 중요한 역할을 한다. 하지만, 고분자 분리막은 일반적으로 투과도와 선택도의 역상관 관계를 나타내는 단점이 있다; 즉, 투과도가 높으면 선택도가 낮고, 선택도가 높으면 투과도가 높다. 이러한 단점을 극복하기 위한 방안 중의 하나가 촉진수송이다. 지난 수십 년간 촉진수송 이론은 촉진수송 분리막 제조에 있어 매우 중요하고 다양한 모델을 제시하는 데에 핵심적인 역할을 하였다. 한편, 촉진수송에서 주된 역할을 하는 운반체의 특성, 매질의 유동성 및 고분자 복합체의 물리화학적 성질 등을 이해하는 것은 중요하다. 운반체의 유동성에 따라 촉진수송 분리막의 종류를 3가지로 나눌 수 있다; 즉, 이동상 운반체 분리막, 준이동상 운반체 분리막, 고정상 운반체 분리막. 또한 촉진 운반체가 특정물질과 상호작용하는 데에는 4가지 종류의 가역반응으로 나눌 수 있다; 즉, 수소원자 전달 반응, 친핵성 첨가반응, 파이-착체 반응, 그리고 전기화학 반응. 이러한 촉진수송 분리막은 이산화탄소, 산소, 올레핀(프로필렌, 에틸렌)의 투과도를 선택적으로 향상시키는 역할을 한다. 이와 같이 본 총설에서는 다양한 촉진수송 분리막에 관련된 주요 연구내용과 이러한 연구를 수행하는 대표적인 전략들을 소개하고자 한다.

폐수중 액체막에 의한 페놀의 이동 (Transport of Phenol in Waste Water Through Liquid Surfactant Membrane)

  • 우인성;김병석;김윤선
    • 한국안전학회지
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    • 제5권3호
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    • pp.39-43
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    • 1990
  • The transport of phenol from waste water through the liquid surfactant membrane containing Aliquat 336 as a carrier was analyzed by a theoretical model. Extraction experiments was carried out to investigate the effect of process parameters, such as mixing intensity, concentration of sodium hydroxide in internal aqueous solution, and counter anions, and initial phenol concentration in waste water at $25^{\circ}C$. It was found that transport rate of phenol increased with increasing pH differents. The transport rate of phenol in waste water was influenced by counter anions.

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Inhibition of Dicarboxylate Transport by p-chloromercuribenzoic Acid (PCMB) in Plasma Membrane Vesicles of Rabbit Proximal Tubule

  • Kim, Yong-Keun;Kim, Tae-In;Jung, Jin-Sup;Lee, Sang-Ho
    • The Korean Journal of Physiology
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    • 제25권2호
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    • pp.179-188
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    • 1991
  • Effect of a sulfhydryl reagent, p-chloromercuribenzoic acid (PCMB), on the transport of succinate was studied in brush border (BBMV) and basolateral (BLMV) membrane vesicles isolated from rabbit renal cortex. PCMB induced an irreversible inhibition of the $Na^+-dependent$ succinate uptake in a dose-dependent manner with $IC_{50}$ of 55 and $65\;{\mu}M$ in BBMV and BLMV, respectively. The inhibitory effect of PCMB was prevented by a pretreatment of vesicles with dithiothreitol. PCMB did not increase $Na^+$ permeability at concentrations inhibiting succinate uptake. The PCMB inhibition of succinate uptake was due to a change in Vmax, but not in Km. When membrane vesicles were pretreated with PCMB in the presence of unlabelled succinate, the inhibitory effect was significantly reduced. In both BBMV and BLMV, succinate uptake was inhibited by various sulfhydryl reagents with the inhibitory potency of following order: $HgCl_2$>DTNB>PCMBS>PCMB. These results suggest that sulfhydryl groups are essential for dicarboxylate transport and that they may be located at or near substrate binding sites of the transporters in renal brush border and basolateral membranes.

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