The Influence of Blending Different Molecular Weights of Cellulose Acetate Butyrate for CO2/N2 Separation

Chong, Dick Shion; Jawad, Zeinab Abbas; Tan, Peng Chee; Al-Fatlawi, Mayyadah Shanan Abed

doi:10.21315/jps2020.31.2.7

“…Metal-Organic frameworks (MOFs) composed of metal ions and organic linkers, also known as porous coordination polymers, have developed rapidly and attracted significant attentions in the past two decades [19][20][21][22][23][24][25][26]. Owing to their diverse framework structure, high crystallinity, large surface area, and unlimited adjustability of pore structures and surface functionalities, MOFs exhibit great application prospects in the field of CO 2 capture [14,15,21,23,[27][28][29][30][31][32][33][34][35][36][37]. Nevertheless, it still remains a challenge to design MOFs with quite high CO 2 / N 2 selectivity as well as CO 2 adsorption capacity since the large surface area of MOFs usually leads to both increased CO 2 and N 2 adsorption capacities, resulting in limited CO 2 /N 2 adsorption selectivity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced CO₂ Adsorption and Selectivity of CO₂/N₂ on Amine@ZIF-8 Materials

Zhang

¹

,

Li

²

,

Zhao

³

et al. 2022

Adsorption Science & Technology

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The ZIF-8 crystals were successfully postsynthetically modified using methylamine (MA), ethylenediamine (ED), and N, N ′ -dimethylethylenediamine (MMEN) to improve their adsorption performance toward CO2. Results showed that, compared with the original ZIF-8, the BET specific surface area of MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 has increased by 118.2%, 92.0%, and 29.8%, respectively. In addition, their total pore volume increased separately by 130.8%, 100%, and 48.7%. The adsorption capacities of CO2 on the amine-modified ZIF-8 samples followed the order MA − ZIF − 8 > MMEN − ZIF − 8 > ED − ZIF − 8 > ZIF − 8 . The CO2 adsorption capacities at 298 K on MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 were increased by 118.2%, 90.2%, and 29.8%, respectively. What is more, the CO2/N2 selectivities calculated using an IAST model of the amine@ZIF-8 samples at 0.01 bar and 298 K were also significantly improved and followed the order MA − ZIF − 8 31.4 > ED − ZIF − 8 25.1 > MMEN − ZIF − 8 14.1 > ZIF − 8 11.5 , which increased by 173.0%, 121.4%, and 22.6%, respectively. The isosteric heat of CO2 adsorption ( Q st ) on the MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 all becomes higher, while Q st of N2 on these samples was slightly lower in comparison with that on the ZIF-8. Furthermore, after six recycle runs of gravimetric CO2 adsorption-desorption on MA-ZIF-8, the adsorption performance of CO2 is still very good, indicating that the MA-ZIF-8 sample has good regeneration performance and can be applied into industrial CO2 adsorption and separation.

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“…Various factors have the potential to influence the density of membrane packing and its overall structure. These factors include processing condition, polymer molecular weight and post treatment methods . This supramolecular structure plays a crucial role in determining the separation properties of the membranes, such as gas permeability and selectivity …”

Section: Discussionmentioning

confidence: 99%

Electro-casting for Superior Gas Separation Membrane Performance and Manufacturing

Alkandari,

Castro-Dominguez

2023

ACS Appl. Mater. Interfaces

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Gas separation polymer membranes play a pivotal role in various industrial processes including carbon capture and hydrogen production. However, the inherent trade-off between permeability and selectivity coupled with challenges in membrane manufacturing has hindered their widespread industrial deployment. To address the permselectivity challenges, researchers have explored increasingly complex polymers, composite systems, and other materials. In this study, we introduce a novel membrane manufacturing technique called “electro-casting” that not only enables efficient membrane fabrication but also enhances the trade-off of traditional polymer-based membranes. We fabricated cellulose acetate (CA) membranes embedded with 1-ethyl-3-methyl imidazolium via electro-casting and performed a comparative analysis of structural, morphological, and gas transport characteristics against membranes made via conventional casting techniques. We discovered that electro-casted membranes exhibited a unique crystalline structure, surface topology that induced a remarkable 200% improvement in CO 2 /N 2 selectivity and a 110% increase in CO 2 /CH 4 selectivity. The electric field generated during the manufacturing process played a crucial role in altering the supramolecular structure of the polymer, thereby increasing the separation properties of the membranes as well as their thermal and mechanical features. Electro-casting induced a polymer crystallization effect that disrupted the permeability-selectivity trade-off observed in conventional membranes, while producing highly stable membranes. Moreover, the simplicity of this manufacturing method and its significant impact on membrane properties have the potential to accelerate the deployment of gas separation membranes, facilitating the transition toward a NetZero chemical industry.

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“…Furthermore, higher PEG content in the casting solution results in an increase of rubbery segments that leads to a higher dominance of gas separation through adsorption [184]. Further, the pore-forming and pore-reducing effects of PEG of different molecular weights must also be considered due to the relationship between CO 2 /N 2 selectivity and CO 2 permeance [118,185]. PEG with low molecular weights results in higher gas permeation with the cost of selectivity, while the PEG with high molecular weights results in the opposite effect [186].…”

Section: Polymer Blendmentioning

confidence: 99%

The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation

Juber

¹

,

Jawad

²

,

Chin

³

et al. 2021

Self Cite

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Carbon dioxide (CO2) emissions have been the root cause for anthropogenic climate change. Decarbonisation strategies, particularly carbon capture and storage (CCS) are crucial for mitigating the risk of global warming. Among all current CO2 separation technologies, membrane separation has the biggest potential for CCS as it is inexpensive, highly efficient, and simple to operate. Polymeric membranes are the preferred choice for the gas separation industry due to simpler methods of fabrication and lower costs compared to inorganic or mixed matrix membranes (MMMs). However, plasticisation and upper-bound trade-off between selectivity and permeability has limited the gas separation performance of polymeric membranes. Recently, researchers have found that the blending of glassy and rubbery polymers can effectively minimise trade-off between selectivity and permeability. Glassy poly(ethersulfone) (PES) and rubbery poly(ethylene) glycol (PEG) are polymers that are known to have a high affinity towards CO2. In this paper, PEG and PES are reviewed as potential polymer blend that can yield a final membrane with high CO2 permeance and CO2/nitrogen (N2) selectivity. Gas separation properties can be enhanced by using different solvents in the phase-inversion process. N-Methyl-2-Pyrrolidone (NMP) and Dimethylformamide (DMF) are common industrial solvents used for membrane fabrication. Both NMP and DMF are reviewed as prospective solvent blend that can improve the morphology and separation properties of PES/PEG blend membranes due to their effects on the membrane structure which increases permeation as well as selectivity. Thus, a PES/PEG blend polymeric membrane fabricated using NMP and DMF solvents is believed to be a major prospect for CO2/N2 gas separation.

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The Influence of Blending Different Molecular Weights of Cellulose Acetate Butyrate for CO2/N2 Separation

Abstract: To cite this article: Chong, D. S. et al. (2020). The influence of blending different molecular weights of cellulose acetate butyrate for CO 2 /N 2 separation.

Cited by 7 publications

References 22 publications

Enhanced CO₂ Adsorption and Selectivity of CO₂/N₂ on Amine@ZIF-8 Materials

Enhanced CO₂ Adsorption and Selectivity of CO₂/N₂ on Amine@ZIF-8 Materials

Electro-casting for Superior Gas Separation Membrane Performance and Manufacturing

The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation

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The Influence of Blending Different Molecular Weights of Cellulose Acetate Butyrate for CO2/N2 Separation

Abstract: To cite this article: Chong, D. S. et al. (2020). The influence of blending different molecular weights of cellulose acetate butyrate for CO 2 /N 2 separation.

Cited by 7 publications

References 22 publications

Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amine@ZIF-8 Materials

Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amine@ZIF-8 Materials

Electro-casting for Superior Gas Separation Membrane Performance and Manufacturing

The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation

Contact Info

Product

Resources

About

Enhanced CO₂ Adsorption and Selectivity of CO₂/N₂ on Amine@ZIF-8 Materials

Enhanced CO₂ Adsorption and Selectivity of CO₂/N₂ on Amine@ZIF-8 Materials