• Title/Summary/Keyword: 투과막

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The Study of Gas Permeability through the Polyimide Membranes according to Imidization (이미드화도에 따른 폴리이미드 막의 기체루과에 관한 연구)

  • 김남일;조한석;홍치선;남세종
    • Proceedings of the Membrane Society of Korea Conference
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    • 1991.10a
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    • pp.37-38
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    • 1991
  • 몇가지 dianhydride와 diamine을 사용하여 합성한 PAA막을 가열온도와 가열시간을 달리하여 이미드화를 달리하는 막을 제조하고 이압법에 의하여 투과계수와 확산계수를 측정하였다. 이로부터 얻은 흡수계수는 Dual-Mode Sorption Model에 의하여 상관시켰다. 이로부터 polyimide막에 있어서 이미드화에 따른 기체루과 특성과 화학구조에 의한 기체투과 특성의 일부를 규명하였다.

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CA 계열막을 이용한 순수 $CO_2$$CH_4$ 및 혼합 기체에 대한 투과특성 연구

  • 김홍일;김현준;홍석인
    • Proceedings of the Membrane Society of Korea Conference
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    • 1992.10a
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    • pp.59-60
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    • 1992
  • 고분자막을 이용한 분리기술은 에너지 절약과 높은 효율성으로 인해 현재 광범위하게 연구되어 지고 있다. CO$_2$와 CH$_4$를 주성분으로 하는 natural gas 분리나 수소회수, $H_2/CO_2$ 분리등의 실제 분리목적을 수행하기 위해서는 동시에 투과도와 선택도가 높은 막의 개발이 필요한데, 이러한 두가지 분리막 특성을 향상시키기 위해 새로운 고분자 재질의 개발이나 박막화등을 시도하여 왔다.

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Separation of $H_2$ and $N_2$ by PDMS-NaYZeolite Composite Membranes (PDMS-NaYZeolite 막에 의한 수소-질소 분리에 관한 연구)

  • Ha, Jung-Im;Kang, Tae-Beom
    • Membrane Journal
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    • v.20 no.1
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    • pp.47-54
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    • 2010
  • The PDMS-NaYzeolite composite membranes were prepared by adding 1~40 wt% NaYzeolite to PDMS. In order to investigate the characteristics of these membranes, we used the analytical methods such as FT-IR, $^1H$-NMR, and SEM. The permselectivity of $H_2$ and $N_2$ gases through the composite membranes was studied as a function of NaYzeolite contents. The permeability and selectivity ($H_2/N_2$) of PDMS membrane increased as the gas permeation pressure increased. The permeability of the PDMS-NaYzeolite composite membranes increased when 1~10 wt% NaYzeolite was added, and then decreased at higher wt% as NaYzeolite content increased. The selectivity ($H_2/_2$) of PDMS-NaYzeolite composite membranes decreased when 1~2 wt% NaYzeolite was added, and then increased as NaYzeolite content increased. As the $H_2$ permeability increased, the selectivity ($H_2/N_2$) of PDMS-NaYzeolite composite membranes decreased at 0~2 wt% and 10~40 wt% NaYzeolite contents, increased at 2~10 wt% NaYzeolite content.

Preparation of PEBAX/PVDF Composite Membrane and Separaration of Ethanol/Water Mixtures by Pervaporation (PEBAX/PVDF 복합막 제조 및 투과증발을 통한 에탄올/물 분리 연구)

  • Ye Won Jeong;Haeeun Na;Se Wook Jo;Min Young Shon
    • Membrane Journal
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    • v.33 no.6
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    • pp.377-382
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    • 2023
  • In this study, a PEBAX/PVDF composite membrane was fabricated, and its pervaporation performance was tested in an ethanol/water mixture. In addition, we attempted to improve the pervaporation performance of the composite membrane by forming a ZIF-8 layer on the surface of the PVDF substrate. The thickness of selective layer was optimized by comparing the pervaporation performance depending on the PEBAX thickness. A pervaporation test was performed on the Ethanol/Water mixture. As a result, the composite membrane using PVDF substrate with ZIF-8 layer had a flux of 1.98 kg/m2h and separation factor of 3.88, showing higher values of both permeation flux and selectivity than the composite membrane using bare PVDF substrate.

Separation of Gas Based on PTMSP-silica-PEI Composites (PTMSP-silica-PEI 복합막에 의한 기체 분리에 관한 연구)

  • Kang Tae-Bum;Hong Se-Lyung
    • Membrane Journal
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    • v.16 no.2
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    • pp.123-132
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    • 2006
  • The PTMSP-silica-PEI composite membranes were synthesized from tetraethoxysilane (TEOS) and poly (1-trimethylsilyl-1-propyne) (PTMSP) by sol-gel process. The PTMSP-silica nanocomposite membranes were characterized by $^1H-NMR$, FT-IR, TGA, XPS, SEM, GPC and gas permeation measurements were accomplished with $H_2,\;O_2,\;N_2,\;CO_2,\;CH_4$. The gases permeability increased with increasing TEOS content. Both the permeability and selectivity of $H_2,\;CH_4$ increased to 15 wt% TEOS. While the permeability of $O_2,\;CO_2$ increased without decrease of selectivity.

Review on Changes in Surface Properties and Performance of Polyamide Membranes when Exposed to Acidic Solutions (산성용액 노출 시 폴리아마이드 분리막의 표면성질 및 투과성능 변화에 관한 총설)

  • Lee, Hyung Kae;Dao, Huyen Thi Thanh;Kang, Wooseok;Kwon, Young-Nam
    • Membrane Journal
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    • v.30 no.5
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    • pp.283-292
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    • 2020
  • Various kind of solutions need to be separated, purified, and concentrated using membranes in the field of industries. However, when the solution contains strong acids, the use of membrane is limited. Acid resistant membrane currently available in market does not show high efficiency of flux. This review explains the causes and mechanisms of changes in surface properties and performance of polyamide membranes when exposed to acidic solutions, and this can be used in the development of a membrane with acid resistance and high flux.

Removal of Halogenated Organic Compounds in Wastewater by Pervaporation (투과증발법을 이용한 폐수중의 미량 유기염소계 화합물의 제저)

  • 오부근;하성룡;하상태;이영무
    • Membrane Journal
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    • v.4 no.1
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    • pp.57-62
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    • 1994
  • This study uses pervaporation process to separate small amount of organic trichloroethylene, chloroform and perchloroethylene from contaminated water, since chlorinated hydrocarbones are known to be cancer suspecting compounds. For the separation of small amount of halogenated organic compound dissolved in wastewater, pervaporation membranes should be polymers that possess affinity with orgnic compounds and hydrophobicity. We used polyisobutylene, polyetheramide and polydimethylsiloxane membranes. The degree of affinity between organics and polymers were measured by contact angle method. We had good separation results that separation factor ranged from 34 to 19100 and permeate flux was$19.7~140g/m^2hr$.

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A Study on the Preparation and Hydrophilization of Polypropylene Microfiltration Membrane by Radiation-Induced Graft Polymerization (방사선 중합에 의한 폴리프로필렌 정밀여과막의 제조 및 친수화 거동에 관한 연구)

  • 황택성;이선아;황의환
    • Polymer(Korea)
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    • v.24 no.5
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    • pp.621-628
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    • 2000
  • Microporous polypropylene (PP) membranes have the high chemical and corrosion resistance, the good mechanical properties and the thermal stability under high temperatures, but its application is restricted within narrow limits due to hydrophobicity of membranes. In order to impart permanent hydrophilicity to the PP microfiltration membrane, the radiation-induced graft of 2-hydroxyethyl methacrylate (HEMA) and acrylic acid (AAc) containing hydrophilic functional group onto the membrane has been studied. The effect of graft conditions such as reaction time, total radiation dose, reaction temperatures, acid compositions on graft yield was investigated. Modified PP membranes were shown to cause an increase in the gas flux. Oil emulsion permeation flux of both original PP membrane and modified PP membrane was examined.

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A Study on the Opimization of Process and Operation Condition for Membrane System in Tap Water Treatment (분리막을 이용한 정수처리 System에서 처리공정 및 운전조건의 최적화에 관한연구)

  • 오중교
    • Membrane Journal
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    • v.9 no.4
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    • pp.193-201
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    • 1999
  • The object of study were the development of membrane process and the optimization of operation condition for membrane system, which was used the pre-treatment system of tap water treatment in steady of conventional process such as coagulation, sedimentation. The higher steady flux is very important factor, by a suitable pre-treatment and optimization of operating condition such as fouling control, crossflow and backwashing method, in membrane system. So, we were observed the effect of flux decline for membrane used by 4 type ultrafiltration(UF) membrane pre-treatment process, and optimized the operation condition of filtration system under various MWCO(Molecular weight cut-off), operation pressure, linear velocity and temperature to maintain higher flux. From these experiment, we were identified that UF process showed a slower flux decline rate and a higher flux recovery than microfiltration(MF) membrane. The water quality of UF permeate was better than that of MF, and was not effected pre-treatment process. In the operation condition, the rate of flux decline was diminished by a higher linear velocity and operation temperature, lower pressure.

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Separation Characteristics of Oxygen Isotopes with Hydrophobic PTFE Membranes (소수성 PTFE 막의 산소동위원소 분리특성)

  • 김재우;박상언;김택수;정도영;고광훈;박경배
    • Membrane Journal
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    • v.13 no.3
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    • pp.154-161
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    • 2003
  • We measured the permeation characteristics of water with the hydrophobic PTFE membranes dependent on water temperature to confirm the separation of oxygen isotopes using Air Gap Membrane Distillation (AGMD) and Vacuum Enhanced Membrane Distillation (VEMD). Isotopic concentrations of $H_2^{16}O$ and $H_2^{18}O$ of the permeated water vapor were measured by Diode Laser Absorption Spectroscopy. Concentrations of the heavy oxygen isotopes in the permeated water vapor were decreased. Isotope separation coefficients for the hydrophobic PTFE membranes were 1.004∼1.01 depending on the experimental conditions. We observed the effects of air in membrane pores on the oxygen isotope separation. Isotope separation coefficients for the hydrophobic PTFE membranes without air in pores are higher than those for the membrane with air in pores.