Enhancement of gas permeability for CH4/N2 separation membranes by blending SBS to Pebax polymers

Guan, Panpan; Luo, Jun; Li, Wei; Si, Ziqin

doi:10.1007/s13233-017-5130-9

Cited by 23 publications

(10 citation statements)

References 34 publications

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“…The characteristic peaks seen in pure Pebax-2533 are 1103 cm −1 , 1643 cm −1 , 1735 cm −1 , and 3300 cm −1 , which correspond to (-C-O-C-), stretching vibration amide (H-N-C=O-), saturated esters (-C=O), and amine (-N-H), respectively. They were almost identical to the reports in the literature [43][44][45]. As the ZIF-7 content increased, the characteristic peaks in ZIF-7 gradually increased at 740 cm −1 , 1241 cm −1 , and 1465 cm −1 .…”

Section: Properties Of Composite Membranessupporting

confidence: 90%

CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

2021

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In this study, we mixed the zeolitic imidazolate framework-7 (ZIF-7) with poly(ether-b-amide)® 2533 (Pebax-2533) and used it as a selective layer for a composite membrane. We prepared the composite membrane’s substrate using polysulfone (PSf), adjusted its pore size using polyethylene glycol (PEG), and applied polydimethylsiloxane (PDMS) to the gutter layer and the coating layer. Then, we investigated the membrane’s properties of gases by penetrating a single gas (N2, CO2) into the membrane. We identified the peaks and geometry of ZIF-7 to determine if it had been successfully synthesized. We confirmed that ZIF-7 had a BET surface area of 303 m2/g, a significantly high Langmuir surface area of 511 m2/g, and a high CO2/N2 adsorption selectivity of approximately 50. Considering the gas permeation, with ZIF-7 mixed into Pebax-2533, N2 permeation decreased from 2.68 GPU in a pure membrane to 0.43 GPU in the membrane with ZIF-7 25 wt%. CO2 permeation increased from 18.43 GPU in the pure membrane to 26.22 GPU in the ZIF-7 35 wt%. The CO2/N2 ideal selectivity increased from 6.88 in the pure membrane to 50.43 in the ZIF-7 25 wt%. Among the membranes, Pebax-2533/ZIF-7 25 wt% showed the highest permeation properties and the characteristics of CO2-friendly ZIF-7.

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Section: Properties Of Composite Membranessupporting

confidence: 90%

CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

2021

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“…As shown in this figure, the highest CO 2 permeabilities were those of PEBA3 (92, 110 and 146 Barrer at 25, 35 and 50°C, respectively), whereas PEBA5 provided the lowest flow values (73, 86 and 110 Barrer of CO 2 at 25, 35 and 50°C, respectively). Usually, crystalline polymers tend to be less permeable than the amorphous ones, since hard segments in semi-crystalline polymers block the movement of gas molecules through the membrane, due to the inflexibility of the chains [25]. Based on this statement, PEBA5 was expected to be the sample with the highest gas permeability in this study because it was the membrane with the lowest crystallinity, acording to DSC analyses (table 1 and figure 3), followed by PEBA3 and PEBA1.…”

Section: Resultsmentioning

confidence: 99%

Poly(ether- block -amide) copolymer membrane for CO ₂ /N ₂ separation: the influence of the casting solution concentration on its morphology, thermal properties and gas separation performance

et al. 2019

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The present work is focused on the study of the effect that the casting solution concentration has on the morphology and gas separation performance of poly(ether- block -amide) copolymer membranes (Pebax ® MH 1657). With this aim, three different concentrations of Pebax ® MH 1657 in the casting solution (1, 3 and 5 wt%) were used to prepare dense membranes with a thickness of 40 µm. The morphology and thermal stability of all membranes were characterized by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, rotational viscometry and thermogravimetric analyses. An increase in crystallinity was notable when the amount of solvent in the Pebax ® MH 1657 solution was higher, mainly related to the polymer chains arrangement and the solvent evaporation time. Such characteristic seemed to play a key role in the thermal degradation of the membranes, confirming that the most crystalline materials tend to be thermally more stable than those with lower crystallinity. To study the influence of their morphology and operating temperature on the CO 2 separation, gas separation tests were conducted with the gas mixture CO 2 /N 2 . Results indicated that a compromise must be found between the amount of solvent used to prepare the membranes and the crystallinity, in order to reach the best gas separation performance. In this study, the best performance was achieved with the membrane prepared from a 3 wt% casting solution, reaching at 35°C and under a feed pressure of 3 bar, a CO 2 permeability of 110 Barrer and a CO 2 /N 2 selectivity of 36.

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“…In the FTIR spectrum of pure PEBAX membrane (Figure 3a), the peak at 3285 cm −1 corresponds to the stretching vibration of N‐H groups in PEBAX, which probably overlapped with ‐OH peak attributed to the absorbed humidity on the polymer. The peaks observed at 1739 and 1099 cm −1 are related to the stretching vibrations of carbonyl (C═O) and CO groups in PEBAX, respectively 11,16 . The peak around 1535 cm −1 is attributed to the bending vibration of NH bond 6 and the peak at 1638 cm −1 is ascribed to the stretching vibration of C═O in the amide group 16,25 …”

Section: Resultsmentioning

confidence: 99%

“…The peaks observed at 1739 and 1099 cm −1 are related to the stretching vibrations of carbonyl (C═O) and CO groups in PEBAX, respectively 11,16 . The peak around 1535 cm −1 is attributed to the bending vibration of NH bond 6 and the peak at 1638 cm −1 is ascribed to the stretching vibration of C═O in the amide group 16,25 …”

Section: Resultsmentioning

confidence: 99%

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Permselectivity improvement of PEBAX® 2533 membrane by addition of glassy polymers (Matrimid® and polystyrene) for CO₂/N₂ separation

Ansari

Navarchian

Rajati

2021

J of Applied Polymer Sci

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Two series of novel blend membranes based on poly(ether‐block‐amide) (PEBAX® 2533) and 5 and 10 wt% of two glassy polymers (Matrimid® and polystyrene [PS]) were prepared using a new mixed solvent with a low boiling point for CO2/N2 separation. Fourier‐transform infrared spectroscopy, field emission scanning electron microscopy, and X‐ray diffraction analyses were used to characterize the samples. A decrease in membrane crystallinity was observed by the addition of glassy polymers. The gas permeability measurements were performed to obtain CO2/N2 permselectivity of membranes. The maximum performance was found for the membrane with 5 wt% Matrimid content, for which CO2 permeability and CO2/N2 selectivity increased by 21% and 76%, respectively. Three permeation models were used to predict the CO2 permeability of blend membranes. The Maxwell model showed acceptable coincidence with the experimental data at 5 wt% content of the glassy polymer. For 10 wt% content of glassy polymer, the Lewis‐Neilson model showed the most accurate predictions for CO2 permeability. A method for quantitative comparison of membrane performance was also proposed by defining the geometric closeness to the Robson upper bound limit. Finally, it was found that an increase in the feed pressure improved the membrane performance at high pressures.

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Enhancement of gas permeability for CH4/N2 separation membranes by blending SBS to Pebax polymers

Cited by 23 publications

References 34 publications

CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

Poly(ether- block -amide) copolymer membrane for CO ₂ /N ₂ separation: the influence of the casting solution concentration on its morphology, thermal properties and gas separation performance

Permselectivity improvement of PEBAX® 2533 membrane by addition of glassy polymers (Matrimid® and polystyrene) for CO₂/N₂ separation

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Enhancement of gas permeability for CH4/N2 separation membranes by blending SBS to Pebax polymers

Cited by 23 publications

References 34 publications

CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

Poly(ether- block -amide) copolymer membrane for CO 2 /N 2 separation: the influence of the casting solution concentration on its morphology, thermal properties and gas separation performance

Permselectivity improvement of PEBAX® 2533 membrane by addition of glassy polymers (Matrimid® and polystyrene) for CO2/N2 separation

Contact Info

Product

Resources

About

Poly(ether- block -amide) copolymer membrane for CO ₂ /N ₂ separation: the influence of the casting solution concentration on its morphology, thermal properties and gas separation performance

Permselectivity improvement of PEBAX® 2533 membrane by addition of glassy polymers (Matrimid® and polystyrene) for CO₂/N₂ separation