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CO2/N2 분리를 위한 Pebax 혼합막에서 Zeolitic Imidazolate Framework-7의 영향
윤숭석,홍세령 한국공업화학회 2021 공업화학 Vol.32 No.4
본 연구는 대표적 poly(ether-b-amide)인 Pebax-1657과 Pebax-2533에 합성된 zeolitic imidazolate framework-7 (ZIF-7)을 넣어 혼합막을 제조하고, 단일기체 N2, CO2에 대한 투과 성질을 조사하였다. 기체투과 결과에서, N2의 경우 Pebax-1657/ZIF-7혼합막과 Pebax-2533/ZIF-7 혼합막 모두 ZIF-7 혼입에 따라 투과도가 감소하는 비슷한 현상을 보였지만, CO2 투과도의경우는 고분자에 종류에 따라 조금 다른 경향을 보였다. Pebax-1657/ZIF-7 혼합막의 경우는 ZIF-7의 0~3 wt% 함량 범위에서 CO2 투과도가 감소하다가 그 이후 함량에서 투과도가 증가하였고, Pebax-2533/ZIF-7 혼합막의 경우는 ZIF-7의0~5 wt% 함량 범위에서 CO2 투과도 증가 없이 감소하였다. CO2/N2 선택도의 경우 두 혼합막 모두 ZIF-7의 함량이많아짐에 따라 증가하는 경향을 보였으며, 특히 Pebax-2533/ZIF-7 5 wt%은 다른 혼합막들에 비해 가장 좋은 투과 성능을 보였다. 이는 ZIF-7이 Pebax-1657보다 Pebax-2533에 더 좋은 호환성을 보이며 CO2에 대한 선택적인 특성이 잘 나타났기 때문으로 생각된다.
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Hamidreza Sanaeepur,Samaneh Mashhadikhan,Ghassem Mardassi,Abtin Ebadi Amooghin,Bart Van der Bruggen,Abdolreza Moghadassi 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.8
Commercial poly (ether-block-amide) (Pebax®) copolymers are thermoplastic elastomers that have attracted attention as membrane materials due to their high performance in CO2 separation. In this study, a cross-linking reaction is reported as a viable strategy to improve the gas separation performance of a highly permeable but low selective Pebax 2533 membrane. To this end, a new bi-functional aminosilane cross-linker (3-aminopropyl(diethoxy)methylsilane (APDEMS)) was applied. Cross-linked Pebax 2533 membranes were prepared via solution-casting with different amounts of APDEMS ranging from 0.5 to 4 wt%, to investigate the effect of the aminosilane concentration on the membrane performance. Gas separation with prepared membranes was studied for CO2/N2 at the feed pressure ranges of 2-10 bar. Instrumental analyses were applied to investigate the effect of the cross-linking reaction on the structure and properties of the membranes. The results showed that a 2 wt% APDEMS cross-linked Pebax 2533 membrane has the best gas separation performance. The CO2/N2 ideal selectivity of the cross-linked Pebax 2533 increased twice compared to the neat Pebax 2533 membrane at the feed pressure of 2 bar, while the CO2 permeability experienced a slight decrease by cross-linking, but still remains higher than the permeability of other Pebax grades.
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김소영,강상욱,Kim, Soyoung,Kang, Sang Wook 한국막학회 2021 멤브레인 Vol.31 No.1
본 연구는 현재 올레핀/파라핀 분리에서 사용되는 극저온 분리법을 대체하기 위한 촉진수송 분리막에 대한 연구이다. 촉진수송 분리 막을 상업화하기 위해서는 비용 절감 또한 매우 중요한 요소이다. 하지만 많은 연구가 이루어지고 있는 AgBF4는 상대적으로 고가인 은 염이기 때문에 이를 대체하기 위해 비교적 저렴한 AgCF3SO3를 이용하여 PEBAX-2533/AgCF3SO3/Al(NO3)3 복합막을 제조하였다. 분리막의 특성은 SEM, FT-IR, RAMAN을 통해 분석되었으며, 이번 연구를 통해 고분자 매트릭스가 장기 안정성에 영향을 준다는 사실을 확인하였다. This study was a study on an facilitated transport membrane to replace the cryogenic separation method currently used in olefin/paraffin separation. Cost reduction is also a very important factor to commercialize facilitated transport membranes. However, AgBF4, which has been studied a lot, is a relatively expensive silver salt. To replace this, a PEBAX-2533/ AgCF3SO3/Al(NO3)3 composite film was prepared using relatively inexpensive AgCF3SO3. It was analyzed through SEM, FT-IR, and RAMAN. Through this study, it was confirmed that the polymer matrix affects the long-term stability.
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Poly(ether-b-amide)/ZIF-7을 이용한 막의 기체투과 특성
윤숭석,홍세령,Yoon, Soong Seok,Hong, Se Ryeong 한국막학회 2021 멤브레인 Vol.31 No.3
본 연구는 합성된 zeolitic imidazolate framework-7 (ZIF-7)을 poly(ether-b-amide) 2533 (PEBAX2533)에 혼합하여 혼합막을 제조하고, 단일기체(N<sub>2</sub>, CO<sub>2</sub>)를 투과하여 기체에 대한 성질을 조사하였다. FT-IR, XRD, FE-SEM을 통해 ZIF-7이 가지는 피크와 형상을 확인하였고, 합성이 잘 되었음을 판단하였다. TGA를 통해 ZIF-7이 우수한 열적 안정성을 가지는 것과 막 내에 혼입되었을 때 순수 PEBAX2533에 비해 열적 안정성이 향상되는 것을 확인하였다. BET를 통해 합성된 ZIF-7의 CO<sub>2</sub> 흡착 능력이 우수하고 CO<sub>2</sub>/N<sub>2</sub> 흡착 선택도가 약 49.64로 높은 편이라는 것을 확인하였다. 기체 투과는 혼합막에서 ZIF-7 함량이 증가함에 따라 N<sub>2</sub> 투과도는 감소하고 CO<sub>2</sub> 투과도는 비교적 적게 감소하면서 CO<sub>2</sub>/N<sub>2</sub> 선택도는 꾸준히 증가하는 모습을 보였다. 특히 ZIF-7 20 wt%이 첨가되었을 때 CO<sub>2</sub> 투과도가 크게 감소하지 않고 선택도가 상당히 증가하여 Robeson upper-bound에 근접하는 결과를 얻었다. In this study, mixed matrix membranes were prepared by mixing the synthesized zeolitic imidazolate framework-7 (ZIF-7) with poly(ether-b-amide) 2533 (PEBAX2533). A single gas (N<sub>2</sub>, CO<sub>2</sub>) was permeated through the membrane to investigate the properties of the gas. Through FT-IR, XRD, and FE-SEM, the peaks and shapes of ZIF-7 were confirmed, and it was determined that the synthesis was successful. Through TGA, it was confirmed that ZIF-7 has excellent thermal stability and that when incorporated into the membrane, the thermal stability is improved compared to pure PEBAX2533. It was found that ZIF-7 synthesized through BET had excellent CO<sub>2</sub> adsorption capacity and CO<sub>2</sub>/N<sub>2</sub> adsorption selectivity showed a high value of about 49.64. For the gas permeation, as the ZIF-7 content in the mixed membrane increases, the N<sub>2</sub> permeability decreases and the CO<sub>2</sub> permeability slightly decreases, while the CO<sub>2</sub>/N<sub>2</sub> selectivity steadily increases. In particular, when 20 wt% of ZIF-7 was added, the CO<sub>2</sub> permeability did not decrease significantly and the CO<sub>2</sub>/N<sub>2</sub> selectivity increased considerably, resulting in the performance approaching to the Robeson upper-bound.
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Accelerated CO2 transport by synergy effect of ionic liquid and Zn particles
Seung Yeon Rhyu,강상욱 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
In this experiment, an ionic liquid (BMIMBF4) was used to prepare a composite membrane containingZnO nanoparticles. Our previous study indicated that a composite membrane composed of ZnO andthe ionic liquid (BMIMBF4) showed high CO2/N2 separation performance with a GPU of 101 and a selectivityof 42.1. The oxide layer of ZnO nanoparticles with the imidazolium ring of ionic liquid (BMIMBF4)increased the solubility of CO2 and acted as a barrier for N2, leading to an overall improvement in the performance. However, the liquid film was absorbed into support over time and became thickened, leadingto instability. In order to solve this problem, a solid polymer composite film was manufactured and investigatedas a solution. The polymer PEBAX2533 was used as a polymer matrix to produce a compositemembrane capable of showing both high separation performance and long-term stability.
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유승연,강상욱 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this experiment, an ionic liquid (BMIMBF4) was used to prepare a composite membrane containing ZnO nanoparticles. Our previous study indicated that a composite membrane composed of ZnO and BMIMBF4 showed high CO<sub>2</sub>/N<sub>2</sub> separation performance with a GPU of 101 and a selectivity of 42.1. The oxide layer of ZnO nanoparticles with the imidazolium ring of BMIMBF4 increased the solubility of CO<sub>2</sub> and acted as a barrier for N<sub>2</sub>, leading to an overall improvement in the performance. However, the liquid film absorbed the solution over time and thickened, leading to instability. In order to solve this problem, a solid polymer composite film was manufactured and investigated as a possible solution. In this study, the polymer PEBAX-2533 was used as a polymer matrix to produce a composite membrane capable of both high separation performance and long-term stability.
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