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Reza Mosayebi Behbahani - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of a Pebax-1074/ZnO nanocomposite membrane with improved CO 2 separation performance
Journal of Energy Chemistry, 2017Co-Authors: Navid Azizi, Toraj Mohammadi, Reza Mosayebi BehbahaniAbstract:Abstract In this investigation, polymeric nanocomposite membranes (PNMs) were prepared via incorporating zinc oxide (ZnO) into poly (ether-block-amide) (Pebax-1074) polymer matrix with different loadings. The neat membrane and nanocomposite membranes were prepared via solution casting and solution blending methods, respectively. The fabricated membranes were characterized by field emission scanning electron microscopy (FESEM) to survey cross-sectional morphologies and thermal gravimetric analysis (TGA) to study thermal stability. Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) analyses were also employed to identify variations of the chemical bonds and crystal structure of the membranes, respectively. Permeation of pure gases, CO 2 , CH 4 and N 2 through the prepared neat and nanocomposite membranes was studied at pressures of 3–18 bar and temperature of 25 °C. The obtained results showed that the fabricated nanocomposite membranes exhibit better separation performance compared to the neat Pebax membrane in terms of both permeability and selectivity. As an example, at temperature of 25 °C and pressure of 3 bar, CO 2 permeability, ideal CO 2 /CH 4 and CO 2 /N 2 selectivity values for the neat Pebax membrane are 110.67 Barrer, 11.09 and 50.08, respectively, while those values are 152.27 Barrer, 13.52 and 62.15 for Pebax/ZnO nanocomposite membrane containing 8 wt% ZnO.
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synthesis of a Pebax 1074 zno nanocomposite membrane with improved co 2 separation performance
Journal of Energy Chemistry, 2017Co-Authors: Navid Azizi, Toraj Mohammadi, Reza Mosayebi BehbahaniAbstract:Abstract In this investigation, polymeric nanocomposite membranes (PNMs) were prepared via incorporating zinc oxide (ZnO) into poly (ether-block-amide) (Pebax-1074) polymer matrix with different loadings. The neat membrane and nanocomposite membranes were prepared via solution casting and solution blending methods, respectively. The fabricated membranes were characterized by field emission scanning electron microscopy (FESEM) to survey cross-sectional morphologies and thermal gravimetric analysis (TGA) to study thermal stability. Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) analyses were also employed to identify variations of the chemical bonds and crystal structure of the membranes, respectively. Permeation of pure gases, CO 2 , CH 4 and N 2 through the prepared neat and nanocomposite membranes was studied at pressures of 3–18 bar and temperature of 25 °C. The obtained results showed that the fabricated nanocomposite membranes exhibit better separation performance compared to the neat Pebax membrane in terms of both permeability and selectivity. As an example, at temperature of 25 °C and pressure of 3 bar, CO 2 permeability, ideal CO 2 /CH 4 and CO 2 /N 2 selectivity values for the neat Pebax membrane are 110.67 Barrer, 11.09 and 50.08, respectively, while those values are 152.27 Barrer, 13.52 and 62.15 for Pebax/ZnO nanocomposite membrane containing 8 wt% ZnO.
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ionic liquid modified Pebax 1657 membrane filled by zif 8 particles for separation of co2 from ch4 n2 and h2
Journal of Membrane Science, 2017Co-Authors: Toraj Mohammadi, Abolfazl Jomekian, Bahamin Bazooyar, Reza Mosayebi Behbahani, Ali KargariAbstract:Abstract 3-Di-n-butyl-2-mthylimidazolium chloride (DnBMCl) ionic liquid (IL) was synthesized and used for modification of Pebax 1657 surface. ZIF-8 particles synthesized by different molar ratios of precursors, were introduced into the matrix of IL-Pebax 1657 for fabrication of mixed matrix membranes (MMMs) by coating method. Synthesized ZIF-8 particles were characterized using laser particle size analyzer, SEM, XRD and N 2 adsorption. SEM, DSC, FTIR, 13 C NMR, TGA and gas permeation tests were applied for characterization and performance evaluation of MMMs. The modification of Pebax 1657 with DnBMCl lead to formation of possible Carbon-Carbon bonds between Pebax 1657 and DnBMCl and also between ZIF-8 and DnBMCl. Pure gas permeation tests showed that the higher ideal selectivities of CO 2 /CH 4 , CO 2 /N 2 and CO 2 /H 2 were observed for DnBMCl-modified MMMs compared to unmodified MMMs and neat Pebax 1657 membrane. Plasticization lead to inferior CO 2 separation ability of MMMs in mixed gas condition compared to pure gas test. The DnBMCl-modified Pebax 1657/ZIF-8 MMMs showed superior CO 2 /CH 4 , CO 2 /N 2 selectivities at feed pressures of 2 and 4 bar.
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synthesis of a new nanocomposite membrane Pebax 1074 peg 400 tio2 in order to separate co2 from ch4
Journal of Natural Gas Science and Engineering, 2017Co-Authors: Navid Azizi, Toraj Mohammadi, Reza Mosayebi BehbahaniAbstract:Abstract In the present work, effects of poly ethylene glycol (PEG) and TiO2 nanoparticles incorporation with poly (ether-block-amide) (Pebax-1074) on CO2 and CH4 permeability values and ideal CO2/CH4 selectivity through the synthesized membranes were investigated. In order to synthesize the polymeric nanocomposite membranes (PNMs), PEG-400 was blended with Pebax-1074 and TiO2 nanofillers were incorporated into the polymer blend with various weight fractions. To study cross-sectional morphology, crystalline structure and mechanical properties of the synthesized membranes scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and tensile analysis were utilized, respectively. Fourier transform infrared (FT-IR), was also carried out to identify formation of the chemical bonds. Permeation of pure gases, CO2 and CH4, through the prepared neat Pebax, the blended Pebax/PEG and the Pebax/PEG/TiO2 nanocomposite membranes was studied at pressure of 2–10 bar and temperature of 25 °C. The obtained results showed that the synthesized nanocomposite membranes exhibit better separation performance compared to the neat and the blended membranes.
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Synthesis of a new nanocomposite membrane (Pebax-1074/PEG-400/TiO2) in order to separate CO2 from CH4
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Navid Azizi, Toraj Mohammadi, Reza Mosayebi BehbahaniAbstract:Abstract In the present work, effects of poly ethylene glycol (PEG) and TiO2 nanoparticles incorporation with poly (ether-block-amide) (Pebax-1074) on CO2 and CH4 permeability values and ideal CO2/CH4 selectivity through the synthesized membranes were investigated. In order to synthesize the polymeric nanocomposite membranes (PNMs), PEG-400 was blended with Pebax-1074 and TiO2 nanofillers were incorporated into the polymer blend with various weight fractions. To study cross-sectional morphology, crystalline structure and mechanical properties of the synthesized membranes scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and tensile analysis were utilized, respectively. Fourier transform infrared (FT-IR), was also carried out to identify formation of the chemical bonds. Permeation of pure gases, CO2 and CH4, through the prepared neat Pebax, the blended Pebax/PEG and the Pebax/PEG/TiO2 nanocomposite membranes was studied at pressure of 2–10 bar and temperature of 25 °C. The obtained results showed that the synthesized nanocomposite membranes exhibit better separation performance compared to the neat and the blended membranes.
Toraj Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of poly(ether-block-amide) copolymers/multi-walled carbon nanotube nanocomposite membranes for CO_2/CH_4 separation
Korean Journal of Chemical Engineering, 2017Co-Authors: Navid Azizi, Mehran Arzani, Hamid Reza Mahdavi, Toraj MohammadiAbstract:One of the effective techniques for improving separation properties of polymeric membranes is incorporation of suitable nanoparticles into their matrices. This study presents the preparation of three types of nanocomposite membranes comprising three grades of poly (ether- block -amide) (Pebax 1074, Pebax 1657 and Pebax 2533) and modified multi-walled carbon nanotubes (MWCNTs) with different loadings (1, 1.5, 2 and 2.5 wt%). The prepared membranes were characterized by field emission scanning electron microscopy (FESEM), attenuated total reflection-Fourier transfer infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD). Permeation of CO_2 and CH_4 gases through the prepared membranes was measured at the pressure range of 2-8 bars and 25 °C. The results showed that the incorporation of MWCNTs into the polymers matrices improves CO_2/CH_4 selectivity. Further, Pebax 1074/MWCNT nanocomposite membrane exhibits better performance for CO_2/CH_4 separation compared to the neat Pebax and the two other nanocomposite membranes.
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Effects of low and high molecular mass PEG incorporation into different types of poly(ether-b-amide) copolymers on the permeation properties of CO_2 and CH_4
Journal of Polymer Research, 2017Co-Authors: Navid Azizi, Hamid Reza Mahdavi, Mojgan Isanejad, Toraj MohammadiAbstract:Blend membranes were prepared by incorporating two types of polyethylene glycol (PEG) (molecular masses of 400 and 1000 g mol^−1) into three grades of poly(ether- block -amide) (Pebax), namely Pebax 1074, Pebax 1657, and Pebax 2533. The PEGs, which were used as blending agents, were employed at mass fractions ranging from 10 to 40 wt.% based on the mass of Pebax. The gas separation performance of each neat or blend membrane, comprising its CO_2 and CH_4 permeabilities and its ideal CO_2/CH_4 selectivity, was studied at room temperature (25 °C) and at pressures of 2–8 bar. X-ray diffraction (XRD) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) analyses were used to determine the crystallinities of and the chemical bonds in the prepared membranes, respectively. Scanning electron microscopy (SEM) was also utilized to observe the morphologies of the membranes. The results obtained from experimental investigations showed that the incorporation of low molecular mass PEG significantly increased the permeability but only slightly affected the ideal CO_2/CH_4 selectivity, while the incorporation of high molecular mass PEG decreased the permeability considerably but sharply increased the ideal CO_2/CH_4 selectivity. This behavior intensified as the polyether content of the Pebax was decreased. Graphical abstract
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synthesis of a Pebax 1074 zno nanocomposite membrane with improved co 2 separation performance
Journal of Energy Chemistry, 2017Co-Authors: Navid Azizi, Toraj Mohammadi, Reza Mosayebi BehbahaniAbstract:Abstract In this investigation, polymeric nanocomposite membranes (PNMs) were prepared via incorporating zinc oxide (ZnO) into poly (ether-block-amide) (Pebax-1074) polymer matrix with different loadings. The neat membrane and nanocomposite membranes were prepared via solution casting and solution blending methods, respectively. The fabricated membranes were characterized by field emission scanning electron microscopy (FESEM) to survey cross-sectional morphologies and thermal gravimetric analysis (TGA) to study thermal stability. Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) analyses were also employed to identify variations of the chemical bonds and crystal structure of the membranes, respectively. Permeation of pure gases, CO 2 , CH 4 and N 2 through the prepared neat and nanocomposite membranes was studied at pressures of 3–18 bar and temperature of 25 °C. The obtained results showed that the fabricated nanocomposite membranes exhibit better separation performance compared to the neat Pebax membrane in terms of both permeability and selectivity. As an example, at temperature of 25 °C and pressure of 3 bar, CO 2 permeability, ideal CO 2 /CH 4 and CO 2 /N 2 selectivity values for the neat Pebax membrane are 110.67 Barrer, 11.09 and 50.08, respectively, while those values are 152.27 Barrer, 13.52 and 62.15 for Pebax/ZnO nanocomposite membrane containing 8 wt% ZnO.
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Synthesis of a Pebax-1074/ZnO nanocomposite membrane with improved CO 2 separation performance
Journal of Energy Chemistry, 2017Co-Authors: Navid Azizi, Toraj Mohammadi, Reza Mosayebi BehbahaniAbstract:Abstract In this investigation, polymeric nanocomposite membranes (PNMs) were prepared via incorporating zinc oxide (ZnO) into poly (ether-block-amide) (Pebax-1074) polymer matrix with different loadings. The neat membrane and nanocomposite membranes were prepared via solution casting and solution blending methods, respectively. The fabricated membranes were characterized by field emission scanning electron microscopy (FESEM) to survey cross-sectional morphologies and thermal gravimetric analysis (TGA) to study thermal stability. Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) analyses were also employed to identify variations of the chemical bonds and crystal structure of the membranes, respectively. Permeation of pure gases, CO 2 , CH 4 and N 2 through the prepared neat and nanocomposite membranes was studied at pressures of 3–18 bar and temperature of 25 °C. The obtained results showed that the fabricated nanocomposite membranes exhibit better separation performance compared to the neat Pebax membrane in terms of both permeability and selectivity. As an example, at temperature of 25 °C and pressure of 3 bar, CO 2 permeability, ideal CO 2 /CH 4 and CO 2 /N 2 selectivity values for the neat Pebax membrane are 110.67 Barrer, 11.09 and 50.08, respectively, while those values are 152.27 Barrer, 13.52 and 62.15 for Pebax/ZnO nanocomposite membrane containing 8 wt% ZnO.
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ionic liquid modified Pebax 1657 membrane filled by zif 8 particles for separation of co2 from ch4 n2 and h2
Journal of Membrane Science, 2017Co-Authors: Toraj Mohammadi, Abolfazl Jomekian, Bahamin Bazooyar, Reza Mosayebi Behbahani, Ali KargariAbstract:Abstract 3-Di-n-butyl-2-mthylimidazolium chloride (DnBMCl) ionic liquid (IL) was synthesized and used for modification of Pebax 1657 surface. ZIF-8 particles synthesized by different molar ratios of precursors, were introduced into the matrix of IL-Pebax 1657 for fabrication of mixed matrix membranes (MMMs) by coating method. Synthesized ZIF-8 particles were characterized using laser particle size analyzer, SEM, XRD and N 2 adsorption. SEM, DSC, FTIR, 13 C NMR, TGA and gas permeation tests were applied for characterization and performance evaluation of MMMs. The modification of Pebax 1657 with DnBMCl lead to formation of possible Carbon-Carbon bonds between Pebax 1657 and DnBMCl and also between ZIF-8 and DnBMCl. Pure gas permeation tests showed that the higher ideal selectivities of CO 2 /CH 4 , CO 2 /N 2 and CO 2 /H 2 were observed for DnBMCl-modified MMMs compared to unmodified MMMs and neat Pebax 1657 membrane. Plasticization lead to inferior CO 2 separation ability of MMMs in mixed gas condition compared to pure gas test. The DnBMCl-modified Pebax 1657/ZIF-8 MMMs showed superior CO 2 /CH 4 , CO 2 /N 2 selectivities at feed pressures of 2 and 4 bar.
Abolfazl Jomekian - One of the best experts on this subject based on the ideXlab platform.
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ionic liquid modified Pebax 1657 membrane filled by zif 8 particles for separation of co2 from ch4 n2 and h2
Journal of Membrane Science, 2017Co-Authors: Toraj Mohammadi, Abolfazl Jomekian, Bahamin Bazooyar, Reza Mosayebi Behbahani, Ali KargariAbstract:Abstract 3-Di-n-butyl-2-mthylimidazolium chloride (DnBMCl) ionic liquid (IL) was synthesized and used for modification of Pebax 1657 surface. ZIF-8 particles synthesized by different molar ratios of precursors, were introduced into the matrix of IL-Pebax 1657 for fabrication of mixed matrix membranes (MMMs) by coating method. Synthesized ZIF-8 particles were characterized using laser particle size analyzer, SEM, XRD and N 2 adsorption. SEM, DSC, FTIR, 13 C NMR, TGA and gas permeation tests were applied for characterization and performance evaluation of MMMs. The modification of Pebax 1657 with DnBMCl lead to formation of possible Carbon-Carbon bonds between Pebax 1657 and DnBMCl and also between ZIF-8 and DnBMCl. Pure gas permeation tests showed that the higher ideal selectivities of CO 2 /CH 4 , CO 2 /N 2 and CO 2 /H 2 were observed for DnBMCl-modified MMMs compared to unmodified MMMs and neat Pebax 1657 membrane. Plasticization lead to inferior CO 2 separation ability of MMMs in mixed gas condition compared to pure gas test. The DnBMCl-modified Pebax 1657/ZIF-8 MMMs showed superior CO 2 /CH 4 , CO 2 /N 2 selectivities at feed pressures of 2 and 4 bar.
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co2 ch4 separation by high performance co casted zif 8 Pebax 1657 pes mixed matrix membrane
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Toraj Mohammadi, Abolfazl Jomekian, Reza Mosayebi Behbahani, Ali KargariAbstract:Abstract ZIF-8 particles were synthesized at different temperatures. The resulted ZIF-8 particles were characterized by particle size analyzer, SEM, XRD, N 2 adsorption and BET tests. ZIF-8/Pebax 1657 mixed matrix membranes (MMMs) were prepared by co-casting. A thin (1.6–7.1 μm thickness) and defect free selective top layer of ZIF-8/Pebax 1657 was formed on top of polyethersulfone (PES) sub layer. The resulted MMMs with thin selective layer showed significant improvement in CO 2 permeability and CO 2 /CH 4 selectivity in both pure and mixed gas permeation tests compared with pure Pebax 1657 membrane. Remarkable permeability of 758 Barrer with CO 2 /CH 4 selectivity of 16.1 was observed for the MMM synthesized by smallest ZIF-8 particles (fabricated in 60 °C) with about 2 μm thickness of selective layer. The synthesized MMMs in this study showed competitive CO 2 /CH 4 separation performance compared with reported state of the art Pebax based membranes in pure gas permeation tests.
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CO2/CH4 separation by high performance co-casted ZIF-8/Pebax 1657/PES mixed matrix membrane
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Abolfazl Jomekian, Toraj Mohammadi, Reza Mosayebi Behbahani, Ali KargariAbstract:Abstract ZIF-8 particles were synthesized at different temperatures. The resulted ZIF-8 particles were characterized by particle size analyzer, SEM, XRD, N 2 adsorption and BET tests. ZIF-8/Pebax 1657 mixed matrix membranes (MMMs) were prepared by co-casting. A thin (1.6–7.1 μm thickness) and defect free selective top layer of ZIF-8/Pebax 1657 was formed on top of polyethersulfone (PES) sub layer. The resulted MMMs with thin selective layer showed significant improvement in CO 2 permeability and CO 2 /CH 4 selectivity in both pure and mixed gas permeation tests compared with pure Pebax 1657 membrane. Remarkable permeability of 758 Barrer with CO 2 /CH 4 selectivity of 16.1 was observed for the MMM synthesized by smallest ZIF-8 particles (fabricated in 60 °C) with about 2 μm thickness of selective layer. The synthesized MMMs in this study showed competitive CO 2 /CH 4 separation performance compared with reported state of the art Pebax based membranes in pure gas permeation tests.
G. Clarizia - One of the best experts on this subject based on the ideXlab platform.
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Pebax pan hollow fiber membranes for co2 ch4 separation
Chemical Engineering and Processing, 2015Co-Authors: Elisa Esposito, Pavel Izák, G. Clarizia, Paola Bernardo, J C Jansen, Zuzana Sedlakova, Stefano Curcio, Bruno De Cindio, Franco TasselliAbstract:Abstract Poly(ether-b-amide) (Pebax®1657)/polyacrylonitrile (PAN) composite hollow fiber membranes for a potential use in CO2/CH4 separation were prepared by a new continuous coating method, referred to as cross-flow filtration. This technique allows to obtain the simultaneous coating of a large number of fibers, facilitating the scale-up. The dense layer was deposited in the lumen of the fibers allowing the coating of all the fibers in a single step. The coating on the inner surface of the fibers avoids the negative effects such as sticking or accidental mechanical damages occurring in the case of external coating. The membrane preparation was optimized by modulating different parameters. The optimal range of viscosity and concentration of the polymer solution to obtain a selective homogeneous Pebax® layer was identified. The presence of the Pebax®1657 dense layer was confirmed by IR spectroscopy and the morphology of the composite membranes was observed by SEM analysis. The gas separation performance of the membrane modules was determined by single gas permeation measurements. A preliminary optimization yielded membranes with P C O 2 = 5 × 10−3 (m3 m−2 h−1 bar−1), α C O 2 / C H 4 = 18 equal to that of the neat dense polymer. The Pebax®/PAN hollow fibers modules are potentially useful for application in the purification of biogas.
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Pebax®/PAN hollow fiber membranes for CO2/CH4 separation
Chemical Engineering and Processing, 2015Co-Authors: Elisa Esposito, Pavel Izák, G. Clarizia, Paola Bernardo, J C Jansen, Zuzana Sedlakova, Stefano Curcio, Bruno De Cindio, Franco TasselliAbstract:Abstract Poly(ether-b-amide) (Pebax®1657)/polyacrylonitrile (PAN) composite hollow fiber membranes for a potential use in CO2/CH4 separation were prepared by a new continuous coating method, referred to as cross-flow filtration. This technique allows to obtain the simultaneous coating of a large number of fibers, facilitating the scale-up. The dense layer was deposited in the lumen of the fibers allowing the coating of all the fibers in a single step. The coating on the inner surface of the fibers avoids the negative effects such as sticking or accidental mechanical damages occurring in the case of external coating. The membrane preparation was optimized by modulating different parameters. The optimal range of viscosity and concentration of the polymer solution to obtain a selective homogeneous Pebax® layer was identified. The presence of the Pebax®1657 dense layer was confirmed by IR spectroscopy and the morphology of the composite membranes was observed by SEM analysis. The gas separation performance of the membrane modules was determined by single gas permeation measurements. A preliminary optimization yielded membranes with P C O 2 = 5 × 10−3 (m3 m−2 h−1 bar−1), α C O 2 / C H 4 = 18 equal to that of the neat dense polymer. The Pebax®/PAN hollow fibers modules are potentially useful for application in the purification of biogas.
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Gas transport properties of Pebax®/room temperature ionic liquid gel membranes
Separation and Purification Technology, 2012Co-Authors: Paola Bernardo, Franco Tasselli, Veronika Jarmarová, Karel Friess, Johannes Carolus Jansen, Alessio Fuoco, Pavel Izák, Marie Kačírková, Fabio Bazzarelli, G. ClariziaAbstract:Abstract This work evaluates the possibility to tailor the gas separation properties of elastomeric block co-polyamide membranes by means of room temperature ionic liquid (RTIL), based on the 1- n -alkyl-3-methylimidazolium cation. Polymeric gel membranes were prepared by adding from 20 to 80 wt.% of 1-butyl-3-methylimidazolium trifluoromethanesulfonate, [BMIM][CF 3 SO 3 ] to Pebax®1657 and Pebax®2533. The effect of the ionic liquid on the microstructure, properties and performance of these membranes was discussed. DSC analysis showed a gradual decrease of the melting point of the polyamide (PA) blocks in the gel with a decrease in the corresponding melting enthalpy and a complete disappearance of the crystallinity of the polyether (PE) phase with increasing IL content in the case of Pebax®1657. In Pebax®2533 there is virtually no shift in the peak positions and both crystal phases remain present in the gel, indicating effective phase separation between the crystalline fraction of the polymer and the IL, in contrast with the high compatibility and the good mixing of the polymer and the IL observed in Pebax®1657. In the presence of the ionic liquid, the elastic modulus, break strength and maximum elongation all decrease monotonously for Pebax®2533. For the stiffer Pebax®1657 the break strength and maximum elongation show a maximum at low ionic liquid content and then rapidly decrease at higher IL concentration due to compromise between the plasticizing effect of the IL, enhancing its ductability, and the progressive weakening of the gel due to a reduction of the crystal fraction responsible for the mechanical strength. Gas permeation measurements show that the permeability and selectivity of Pebax®2533 are not notably affected by the addition of IL, whereas Pebax®1657 shows a significant increase in the gas permeability. At the same time the permselectivity of the latter for most gas pairs shows a slight decrease, in accordance with the typical Robeson trade-off behaviour. The combination of permeability and selectivity remains nevertheless interesting for applications involving for instance CO 2 removal from exhaust gases.
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gas transport properties of Pebax room temperature ionic liquid gel membranes
Separation and Purification Technology, 2012Co-Authors: Paola Bernardo, Franco Tasselli, Veronika Jarmarová, Karel Friess, Johannes Carolus Jansen, Alessio Fuoco, Pavel Izák, Marie Kačírková, Fabio Bazzarelli, G. ClariziaAbstract:Abstract This work evaluates the possibility to tailor the gas separation properties of elastomeric block co-polyamide membranes by means of room temperature ionic liquid (RTIL), based on the 1- n -alkyl-3-methylimidazolium cation. Polymeric gel membranes were prepared by adding from 20 to 80 wt.% of 1-butyl-3-methylimidazolium trifluoromethanesulfonate, [BMIM][CF 3 SO 3 ] to Pebax®1657 and Pebax®2533. The effect of the ionic liquid on the microstructure, properties and performance of these membranes was discussed. DSC analysis showed a gradual decrease of the melting point of the polyamide (PA) blocks in the gel with a decrease in the corresponding melting enthalpy and a complete disappearance of the crystallinity of the polyether (PE) phase with increasing IL content in the case of Pebax®1657. In Pebax®2533 there is virtually no shift in the peak positions and both crystal phases remain present in the gel, indicating effective phase separation between the crystalline fraction of the polymer and the IL, in contrast with the high compatibility and the good mixing of the polymer and the IL observed in Pebax®1657. In the presence of the ionic liquid, the elastic modulus, break strength and maximum elongation all decrease monotonously for Pebax®2533. For the stiffer Pebax®1657 the break strength and maximum elongation show a maximum at low ionic liquid content and then rapidly decrease at higher IL concentration due to compromise between the plasticizing effect of the IL, enhancing its ductability, and the progressive weakening of the gel due to a reduction of the crystal fraction responsible for the mechanical strength. Gas permeation measurements show that the permeability and selectivity of Pebax®2533 are not notably affected by the addition of IL, whereas Pebax®1657 shows a significant increase in the gas permeability. At the same time the permselectivity of the latter for most gas pairs shows a slight decrease, in accordance with the typical Robeson trade-off behaviour. The combination of permeability and selectivity remains nevertheless interesting for applications involving for instance CO 2 removal from exhaust gases.
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Gas transport properties of Pebax®/room temperature ionic liquid gel membranes
Separation and Purification Technology, 2012Co-Authors: Paola Bernardo, Franco Tasselli, Veronika Jarmarová, Karel Friess, Johannes Carolus Jansen, Alessio Fuoco, Pavel Izák, Marie Kačírková, Fabio Bazzarelli, G. ClariziaAbstract:This work evaluates the possibility to tailor the gas separation properties of elastomeric block co-polyamide membranes by means of room temperature ionic liquid (RTIL), based on the 1-n-alkyl-3-methylimidazolium cation. Polymeric gel membranes were prepared by adding from 20 to 80 wt.% of 1-butyl-3- methylimidazolium trifluoromethanesulfonate, [BMIM][CF3SO3] to Pebax®1657 and Pebax®2533. The effect of the ionic liquid on the microstructure, properties and performance of these membranes was discussed. DSC analysis showed a gradual decrease of the melting point of the polyamide (PA) blocks in the gel with a decrease in the corresponding melting enthalpy and a complete disappearance of the crystallinity of the polyether (PE) phase with increasing IL content in the case of Pebax®1657. In Pebax®2533 there is virtually no shift in the peak positions and both crystal phases remain present in the gel, indicating effective phase separation between the crystalline fraction of the polymer and the IL, in contrast with the high compatibility and the good mixing of the polymer and the IL observed in Pebax®1657. In the presence of the ionic liquid, the elastic modulus, break strength and maximum elongation all decrease monotonously for Pebax®2533. For the stiffer Pebax®1657 the break strength and maximum elongation show a maximum at low ionic liquid content and then rapidly decrease at higher IL concentration due to compromise between the plasticizing effect of the IL, enhancing its ductability, and the progressive weakening of the gel due to a reduction of the crystal fraction responsible for the mechanical strength. Gas permeation measurements show that the permeability and selectivity of Pebax®2533 are not notably affected by the addition of IL, whereas Pebax®1657 shows a significant increase in the gas permeability. At the same time the permselectivity of the latter for most gas pairs shows a slight decrease, in accordance with the typical Robeson trade-off behaviour. The combination of permeability and selectivity remains nevertheless interesting for applications involving for instance CO2removal from exhaust gases. © 2012 Elsevier B.V. All rights reserved.
Sang Wook Kang - One of the best experts on this subject based on the ideXlab platform.
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Correlation between Functional Group and Formation of Nanoparticles in Pebax/Ag Salt/Al Salt Complexes for Olefin Separation
Polymers, 2020Co-Authors: Sang Wook KangAbstract:poly ether-block-amide (Pebax)-2533/metal salt/Al salt membranes were prepared for mixed olefin/paraffin separation. Pebax-2533 with 80% ether group and 20% amide group was suggested as the polymer matrix for comparison of separation performance according to the functional group ratio in copolymer Pebax. In addition, Al salts were used to stabilize metal ions for a long time as additives. High permeance was expected with the proportion of high ether groups, since these functional groups provided relatively permeable regions. As a result, the Pebax-2533 composite membrane showed a selectivity of 5 (propylene/propane) with 10 GPU. However, the permeance of membrane was not unexpectedly improved and the selectivity was reduced. The result was analyzed by using SEM, RAMAN and thermogravimetric analysis (TGA), including Fourier transform infrared (FTIR). The reduction in separation performance was determined by using FT-IR. Based on these results, in order to stabilize the metal ions interacting with the polymer through Al(NO3)3, it was concluded that a specific ratio of the amide group was needed in Pebax as a polymer matrix.
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Correlation between Functional Group and Formation of Nanoparticles in Pebax/Ag Salt/Al Salt Complexes for Olefin Separation
2020Co-Authors: Sang Wook KangAbstract:Pebax-2533/metal salt/Al salt membranes were prepared for mixed olefin/paraffin separation. Pebax-2533 with 80% ether group and 20% amide group was suggested as the polymer matrix for comparison of separation performance according to the functional group ratio in copolymer Pebax. In addition, Al salts were used to stabilize metal ions for a long time as additives. High permeance was expected with the proportion of high ether groups since these functional groups provided relatively permeable regions. As a result, the Pebax-2533 composite membrane showed a selectivity of 5 (propylene/propane) with 10 GPU. However, the permeance of membrane was not unexpectedly improved and the selectivity was reduced. The result was analyzed by SEM, FT-RAMAN and TGA, including FT-IR. The reduction in separation performance was determined by FT-IR. From these results, in order to stabilize the metal ions interacting with the polymer through Al(NO3)3, it was concluded that specific ratio of amide group was needed in Pebax as polymer matrix.
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effect of functional group ratio in Pebax copolymer on propylene propane separation for facilitated olefin transport membranes
Scientific Reports, 2019Co-Authors: Kyoung Won Jung, Sang Wook KangAbstract:Pebax-5513/AgBF4/Al(NO3)3 membranes were fabricated for mixed olefin/paraffin separation. In order to improve the selectivity of the membranes utilizing Pebax-1657, Pebax-5513, which increased the ratio of amide groups from 40% to 60% in the copolymer, was used. The selectivity and permeance of the membranes were 7.7 and 11.1 GPU, respectively. Furthermore, the Pebax-5513/AgBF4/Al(NO3)3 membranes had long-term stability because of Al(NO3) to have the stabilizing effect on Ag+ ions acting as an olefin carrier. Unexpectedly, the performance of the membrane selectivity was not improved, and the permeance became rather lower. Generally, when Ag+ ions was added to the polymer containing amide groups, the selectivity increased with the content of the amide groups. However, Al(NO3)3 was added for the stability of Ag+ ions and there was no increase in selectivity. Since the ratio of amide was high, Ag+ ions were favorably in coordination with the oxygen of the carbonyl group, but the NO3- ions in Al(NO3)3 had the enhanced interaction with Ag+ ions as obstacles for olefin complexation. Therefore, the composition ratio of amide/ether in the polymer matrix was negligible for olefin separation.
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Effect of functional group ratio in Pebax copolymer on propylene/propane separation for facilitated olefin transport membranes.
Scientific Reports, 2019Co-Authors: Kyoung Won Jung, Sang Wook KangAbstract:: Pebax-5513/AgBF4/Al(NO3)3 membranes were fabricated for mixed olefin/paraffin separation. In order to improve the selectivity of the membranes utilizing Pebax-1657, Pebax-5513, which increased the ratio of amide groups from 40% to 60% in the copolymer, was used. The selectivity and permeance of the membranes were 7.7 and 11.1 GPU, respectively. Furthermore, the Pebax-5513/AgBF4/Al(NO3)3 membranes had long-term stability because of Al(NO3) to have the stabilizing effect on Ag+ ions acting as an olefin carrier. Unexpectedly, the performance of the membrane selectivity was not improved, and the permeance became rather lower. Generally, when Ag+ ions was added to the polymer containing amide groups, the selectivity increased with the content of the amide groups. However, Al(NO3)3 was added for the stability of Ag+ ions and there was no increase in selectivity. Since the ratio of amide was high, Ag+ ions were favorably in coordination with the oxygen of the carbonyl group, but the NO3- ions in Al(NO3)3 had the enhanced interaction with Ag+ ions as obstacles for olefin complexation. Therefore, the composition ratio of amide/ether in the polymer matrix was negligible for olefin separation.
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Pebax 1657 ag nanoparticles 7 7 8 8 tetracyanoquinodimethane complex for highly permeable composite membranes with long term stability
Scientific Reports, 2019Co-Authors: Sang Wook KangAbstract:Poly (ether-block-amide) resin-1657 (Pebax-1657)/silver nanoparticle (AgNPs)/7,7,8,8-tetracyanoquinodimethane (TCNQ) composite membranes were prepared for olefin/paraffin separation. The long-term performance of composite membranes can be improved by preventing the reduction of silver ions by adding Al(NO3)3 and Pebax-1657, which has 40% amide groups and 60% ether groups, to the polymer matrix for high permeance. In this study, silver ions were reduced to form nanoparticles to which 7,7,8,8-tetracyanoquinodimethane (TCNQ, electron acceptor) was added to produce long-term olefin carriers. The surface of the AgNPs were modified using electron TCNQ to induce positive charges. The polarized surface of the AgNPs in the Pebax-1657 permeable polymer matrix interacted with olefins. The membrane was expected to show exceptional separation performance. The results showed that the Pebax-1657/AgNPs/TCNQ composite membrane exhibited a selectivity of 12.7 and a mixed-gas permeance of 10.2 GPU for durations longer than 76 h. The surface-activated AgNPs were characterized using infrared spectroscopy and X-ray photoelectron spectroscopy.