• Title/Summary/Keyword: PEBAX

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Gas Permeation Characteristics of PEBAX-PEI Composite Membranes Containing ZIF-8 Modified with Amine (Amine으로 개질된 ZIF-8을 함유한 PEBAX-PEI 복합막의 기체투과 특성)

  • Yi, Eun Sun;Hong, Se Ryeong
    • Applied Chemistry for Engineering
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    • v.31 no.6
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    • pp.679-687
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    • 2020
  • In this study, poly(ether-block-amide) (PEBAX)/zeolitic imidazolate framework-8 (ZIF-8)-polyetherimide (PEI), and PEBAX/amine-modified ZIF-8 (amineZIF-8)-PEI composite membranes were prepared by varying the contents of ZIF-8 and amineZIF-8. Also the gas permeability properties of N2 and CO2 were investigated for each composite membrane. The N2 and CO2 permeability of the PEBAX/ZIF-8-PEI composite membrane increased as the ZIF-8 content increased, while the CO2/N2 selectivity gradually decreased. In the case of the PEBAX/amineZIF-8-PEI composite membrane, the permeability of N2 decreased slightly, and CO2 increased till amineZIF-8 amount was 0.5 wt% and then decreased when the content increased further. The CO2/N2 selectivity was the highest with a value of 78.3 at 0.5 wt% of amineZIF-8. because the amine modification in the amineZIF-8 improves the compatibility between PEBAX and amineZIF-8, It seems that amineZIF-8 was evenly dispersed in PEBAX, which could be greatly influenced by the porousity of ZIF-8 and also the affinity of amine toward CO2.

Gas Permeation Characteristics of Propylene/Propane in PEBAX-ZIF Composite Membranes (PEBAX-ZIF 복합막에 의한 Propylene/Propane의 기체투과 특성)

  • Kim, Seul Ki;Hong, Se Ryeong
    • Membrane Journal
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    • v.24 no.4
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    • pp.259-267
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    • 2014
  • PEBAX[poly(ether-block-amide)-ZIF-8(zeolitic imidazolate framework) composite membranes were prepared with different amounts of ZIF-8; 0, 1, 3, 7, 10, and 20 wt%. Gas permeation experiment were performed by varying the temperature of 25, 35, $40^{\circ}C$ under condition $6kgf/cm^2$. Gas permeability of $C_3H_6$, $C_3H_8$ and selectivity ($C_3H_6/C_3H_8$) were investigated by increasing the amount of ZIF-8 in the PEBAX. The gas permeability of $C_3H_6$ and $C_3H_8$ increased as ZIF-8 content increased among 0 to 7 wt% range and decreased among 7 to 20 wt% range. When the ZIF contents of PEBAX-ZIF composite membrane were 7 wt%, the selectivity ($C_3H_6/C_3H_8$) was taken between 3.6 and 3.8 value and also had the lowest activation energy.

CO2 Separation Performance of PEBAX Mixed Matrix Membrane Using PEI-GO@ZIF-8 as Filler (충진물로 PEI-GO@ZIF-8를 사용한 PEBAX 혼합막의 CO2 분리 성능)

  • Eun Sun Yi;Se Ryeong Hong;Hyun Kyung Lee
    • Membrane Journal
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    • v.33 no.1
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    • pp.23-33
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    • 2023
  • In this study, a mixed matrix membrane was prepared by varying the contents of PEI-GO@ZIF-8 synthesized in PEBAX 2533, and the permeation characteristics of N2 and CO2 were studied. The N2 permeability of the PEBAX/PEIGO@ZIF-8 mixed matrix membrane decreased as the PEI-GO@ZIF-8 content increased, and the CO2 permeability showed different trends depending on the PEI-GO@ZIF-8 content. The CO2 permeability increased in pure PEBAX membrane up to PEBAX/PEI-GO@ZIF-8 0.1 wt%, but decreased at the subsequent content. The PEI-GO@ZIF-8 0.1 wt% mixed matrix membrane had a CO2 permeability of 221.9 Barrer and a CO2/N2 selectivity of 60.0, showing the highest permeation properties with improved CO2 permeability and CO2/N2 selectivity among the prepared mixed matrix membrane and we obtained a result that reached the Robeson upper-bound. This is due to the -COOH, -O-, and -OH functional groups of GO and the amine group bonded to PEI, which interact friendly with CO2, and the effect of ZIF-8, which causes gate-opening for CO2 while the fillers are evenly dispersed in PEBAX.

Gas Permeation Characteristics of PEBAX2533 Membrane Containing PEGDA and ZIF-8 (PEGDA와 ZIF-8을 함유한 PEBAX2533 막의 기체투과 특성)

  • Kim, Sun Hee;Hong, Se Ryeong;Lee, Hyun Kyung
    • Membrane Journal
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    • v.30 no.1
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    • pp.46-56
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    • 2020
  • In this study, poly (ether-block-amide) (PEBAX)/poly (ethylene) glycoldiacrylate (PEGDA)/zeolitic imidazolate framework-8 (ZIF-8)-polyethersulfone (PES) composite membranes were prepared. The gas permeation properties of N2 and CO2 were investigated for each composite membrane. First, the gas permeability in the PEBAX/PEGDA-PES composite membrane decreased with increasing PEGDA content for each molecular weight at PEGDA250, PEGDA575, and PEGDA-700 g/mol. The CO2/N2 selectivity showed a constant value and gradually increased with increasing PEGDA content after 30 wt% PEGDA, and PEBAX/PEGDA250 50 wt%-PES prepared by adding PEGDA250 g/mol 50 wt% showed a selectivity of 15.1. This is because as the PEGDA content increases, the number of diacrylate groups increases, and the CO2 affinity due to the ether structure of PEGDA increases. Gas permeation properties according to ZIF-8 were investigated for composite membranes of PEGDA 0 to 30 wt%, with CO2/N2 selectivity almost constant for each molecular weight. The permeability of N2 and CO2 gradually increased with increasing ZIF-8 content, and CO2/N2 selectivity was the highest at 3.4 in PEBAX/PEGDA250 g/mol 30 wt%/ZIF-8 20 wt%-PES composite membrane.

Gas Permeation Characteristics of PEBAX Mixed Matrix Membranes Containing Polyethylenimine-modified GO (Polyethylenimine으로 개질된 GO를 함유한 PEBAX 혼합막의 기체투과 특성)

  • Yi, Eun Sun;Hong, Se Ryeong
    • Membrane Journal
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    • v.31 no.6
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    • pp.404-416
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    • 2021
  • In this study, a mixed matrix membrane was prepared by varying the contents of GO and PEI-GO synthesized in PEBAX2533, and the permeation characteristics of N2 and CO2 were studied. The N2 and CO2 permeability of the PEBAX/GO mixed membrane decreased as the GO content increased, and showed the highest CO2/N2 selectivity of 58.9 at GO 0.3 wt%. For the PEBAX/PEI-GO mixed membrane, the N2 permeability decreased as the PEI-GO content increased, and the CO2 permeability showed a different trend according to the PEI-GO content. Overall, the CO2/N2 selectivity was higher than that of the PEBAX/GO mixed membrane. In particular, PEI-GO 0.3 wt% showed the highest CO2/N2 selectivity of 73.5 among the mixed membranes, and a positive result was obtained as it was located above the Robeson upper bound. This is believed to be due to the molecular sieving channel effect resulting from the original GO structure, the functional groups present in the structure of GO having affinity for CO2, and the effect of amine bound to PEI by modifying GO into PEI.

$CO_2$ permeation behavior of Pebax-2533 plate membranes prepared from 1-Propanol/n-Butanol mixed solvents (1-프로판올/n-부탄올 혼합용매로부터 제조된 Pebax-2533 판형 분리막의 $CO_2$ 투과거동 연구)

  • Lee, Sang Hoon;Kim, Min Zy;Cho, Churl Hee;Han, Moon Hee
    • Membrane Journal
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    • v.23 no.5
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    • pp.367-374
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    • 2013
  • In the present study, Pebax-2533 plate membranes were prepared by drying precursor solutions which were obtained by dissolving Pebax-2533 polymer in 1-Propanol/n-Butanol mixed solvents. And then the $CO_2$ and $N_2$ permeation behaviors were tested by using a time-lag system. The prepared Pebax-2533 plate membranes showed a considerable $CO_2/N_2$ separation performance : the $CO_2$ permeability was 130 to 288 barr, and the $CO_2/N_2$ permselectivity was 5-8. The $CO_2$ permeation data obtained by varying feed pressure, permeation temperature, and solvent composition announced that not only the $CO_2$ sorption but also the $CO_2$ diffusion is equally important in the overall $CO_2$ permeation.

Preparation of PEBAX-5513/Ag Nanoparticles/7,7,8,8-tetracyanoquinodimethane Composites for Olefin Separation and Analysis of Anions (올레핀 분리용 PEBAX-5513/Ag Nanoparticles/7,7,8,8-tetracyanoquinodimethane 복합체 제조 및 음이온 효과 분석)

  • Kim, Soyoung;Kang, Sang Wook
    • Membrane Journal
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    • v.29 no.5
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    • pp.246-251
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    • 2019
  • Facilitated transport membranes using silver nanoparticles as carriers for olefin/paraffin separation have been interested. $AgBF_4$ has been used as a precursor of silver nanoparticles in previous studies. However, relatively expensive $AgBF_4$ is not suitable for commercialization, and thus, PEBAX-5513/AgNPs (precursor: $AgClO_4$)/7,7,8,8-tetracyanoquinodimethane (TCNQ) composite membranes were prepared using silver nanopaticles with relatively inexpensive $AgClO_4$ precursors. Composite membranes of various compositions were prepared for PEBAX-5513/AgNPs/TCNQ composites, but no separation performance was observed. As a result of FT-IR analysis, it was confirmed that silver nanoparticles were formed in the PEBAX-5513 polymer and the surface of Ag nanoparticles was polarized by TCNQ, but the formed silver nanoparticles were not stabilized. From these results, it was concluded that the anion of the precursor plays an important role in the olefin/paraffin separation.

Properties and Gas Permeability of PEBAX Composite Membrane Containing GO (GO를 함유한 PEBAX 복합막의 성질과 기체투과도)

  • Lee, Seul Ki;Hong, Se Ryeong;Lee, Hyun Kyung
    • Membrane Journal
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    • v.28 no.4
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    • pp.233-242
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    • 2018
  • To study gas membrane using GO (graphene oxide), the PEBAX [poly(ether-block-amide)]-GO polymer composite membrane was prepared by adding GO to PEBAX. Through this composite membrane, gas permeation characteristics for $H_2$, $N_2$, $CH_4$, and $CO_2$ were studied. As a result of the gas permeation test, the permeability of $N_2$, $CH_4$, and $CO_2$ to PEBAX-GO composite membranes gradually decreased as the GO content increased. On the other hand, the gas permeability of $H_2$ increased with the increase of GO content, and it was 21.43 barrer at the GO content of 30 wt%, which was about 5 times higher than that of PEBAX membrane. This is because the GO was easier to operate with a fast and selective gas transport channel for $H_2$ than other gases. The increased selectivity ($H_2/N_2$) and selectivity ($H_2/CH_4$) were influenced by the diffusion selectivity by the permeate gas size. The increased selectivity ($CO_2/N_2$) and selectivity ($CO_2/CH_4$) were more influenced by the solubility selectivity due to the affinity of $CO_2$ and GO for -COOH.

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 Gases ($H_2$, $N_2$, $CO_2$, $CH_4$) by PEBAX-NaY Zeolite Composite Membranes (PEBAX-NaY zeolite 복합막에 의한 기체($H_2$, $N_2$, $CO_2$, $CH_4$) 분리에 관한 연구)

  • Kim, Seul Gi;Kang, Tae Beom
    • Membrane Journal
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    • v.25 no.1
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    • pp.27-31
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    • 2015
  • PEBAX[poly(ether-block-amide)]-NaY zeolite composite membrane was studied on the permeability of penetrant $H_2$, $N_2$, $CO_2$ and $CH_4$ and the selectivity. When the NaY zeolite contents of PEBAX-NaY zeolite membranes were increased, the permeability of $H_2$ was increased, but the permeability of $N_2$, $CH_4$ and $CO_2$ was decreased. By the addition of NaY zeolite into PEBAX, the gas selectivity for $H_2$, $N_2$ and $CO_2$ was decreased except the increase of selectivity of $H_2/N_2$. $CO_2/N_2$, $H_2/CO_2$ and Gas/$CH_4$. The highest selectivity among these gases was from $CO_2$. In particular, the gas selectivity for $CO_2$ was the greatest with a value of 12~156.