Membranes for Gas Separation

Zhang, Zhien; Fuoco, Alessio; He, Guangwei

doi:10.3390/membranes11100755

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Worldwide greenhouse gas emissions are rising, particularly due to an acceleration in CO 2 emissions in recent years. For example, the total global annual CO 2 emissions increased from 19.52 billion tonnes in 1980, to 25.24 billion tonnes in 2000, to 34.81 billion tonnes in 2019 [1]. CO 2 emissions occur in several sectors including electricity generation, transportation, buildings, industrial processes like chemical production, and agriculture [2].…”

Section: Introductionmentioning

confidence: 99%

Insect tracheal systems as inspiration for carbon dioxide capture systems

Neal,

Harrison,

Skabelund

et al. 2024

Bioinspir. Biomim.

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Membrane technology advancements within the past twenty years have provided a new perspective on environmentalism as engineers design membranes to separate greenhouse gasses from the environment. Several scientific journals have published articles of experimental evidence quantifying carbon dioxide (CO2), a common greenhouse gas, separation using membrane technology and ranking them against one another. On the other hand, natural systems such as the respiratory system of mammals also accomplish transmembrane transport of CO2. However, to our knowledge, a comparison of these natural organic systems with engineered membranes has not yet been accomplished. The tracheal respiratory systems of insects transport CO2 at the highest rates in the animal kingdom. Therefore, this work compares engineered membranes to the tracheal systems of insects by quantitatively comparing greenhouse gas conductance rates. We demonstrate that on a per unit volume basis, locusts can transport CO2 approximately ⁓100 times more effectively than the best current engineered systems. Given the same temperature conditions, insect tracheal systems transport CO2 three orders of magnitude faster on average. Miniaturization of CO2 capture systems based on insect tracheal system design has great potential for reducing cost and improving the capacities of industrial CO2 capture.

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Section: Introductionmentioning

confidence: 99%

Insect tracheal systems as inspiration for carbon dioxide capture systems

Neal,

Harrison,

Skabelund

et al. 2024

Bioinspir. Biomim.

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“…These characteristics also facilitate simple hybridization with already-in-use reaction systems. Membrane separation is used to separate gas mixtures with different permeabilities due to diffusivity and solubility differences [ 4 , 5 ]. It is considered that the reforming reactions of CO 2 and CH 4 can produce hydrogen, ethylene, propane, acetylene, and benzene.…”

Section: Introductionmentioning

confidence: 99%

Polymer Membranes of Zeolitic Imidazole Framework-8 with Sodium Alginate Synthesized from ZIF-8 and Their Application in Light Gas Separation

Khan

Patil²,

Rathod³

et al. 2023

Polymers

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The potential of nanocomposite membranes (NCMs) prepared by the sodium alginate polymer and embedded with synthesized zeolitic imidazole framework-8 (ZIF-8) as fillers having microporous structure in the application of separation of gaseous mixture generated by the process of methane reforming was assessed. ZIF-8 crystals were created through hydrothermal synthesis, with sizes varying from 50 to 70 nm. NCMs were prepared with a 15% filler loading, i.e., synthesized ZIF-8. NCMs (ZIF-8) having H2 permeability of 28 Barrer and H2/CH4 selectivity of 125 outperformed neat polymer membranes in terms of separation performance at ambient temperature and 4 kg/cm2 pressure. The purity of H2 increased to as high as 95% among the measured values. The NCMs did not, however, outperform a neat polymer membrane in terms of their ability to separate mixtures of gases. Moreover, the combination of ZIF-8 as a filler with sodium alginate was new and had not been reported previously. As a result, it is worthwhile to investigate.

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“…The separation of small gas molecules is of major importance for the recovery of valuable gases and fuel production [ 1 , 2 , 3 ], as well as in other industrial processes, such as air separation, food packaging, and pollution control [ 2 , 4 , 5 , 6 ]. Polymeric-membrane-mediated gas separation appears as one of the preferred choices for the gas separation industry over traditional processes, such as cryogenic distillation, filtration, ion exchange, and thermal and pressure-swing adsorption, due to its simpler fabrication, lower costs, energy efficiency, and reduced environmental impact [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

A Molecular Dynamics Study of Single-Gas and Mixed-Gas N2 and CH4 Transport in Triptycene-Based Polyimide Membranes

Tanis,

Brown,

Neyertz

et al. 2023

Polymers

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Fluorinated polyimides incorporated with triptycene units have gained growing attention over the last decade since they present potentially interesting selectivities and a higher free volume with respect to their triptycene-free counterparts. This work examines the transport of single-gas and mixed-gas N2 and CH4 in the triptycene-based 6FDA-BAPT homopolyimide and in a block 15,000 g mol−1/15,000 g mol−1 6FDA-mPDA/BAPT copolyimide by using molecular dynamics (MD) simulations. The void-space analyses reveal that, while the free volume consists of small-to-medium holes in the 6FDA-BAPT homopolyimide, there are more medium-to-large holes in the 6FDA-mPDA/BAPT copolyimide. The single-gas sorption isotherms for N2 and CH4 over the 0–70 bar range at 338.5 K show that both gases are more soluble in the block copolyimide, with a higher affinity for methane. CH4 favours sites with the most favourable energetic interactions, while N2 probes more sites in the matrices. The volume swellings remain limited since neither N2 nor CH4 plasticise penetrants. The transport of a binary-gas 2:1 CH4/N2 mixture is also examined in both polyimides under operating conditions similar to those used in current natural gas processing, i.e., at 65.5 bar and 338.5 K. In the mixed-gas simulations, the solubility selectivities in favour of CH4 are enhanced similarly in both matrices. Although diffusion is higher in 6FDA-BAPT/6FDA-mPDA, the diffusion selectivities are also close. Both triptycene-based polyimides under study favour, to a similar extent, the transport of methane over that of nitrogen under the conditions studied.

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Membranes for Gas Separation

Abstract: Gas separation is of significant importance for many industrial processes including chemical purification, carbon capture, and fuel production [...]

Cited by 8 publications

References 13 publications

Insect tracheal systems as inspiration for carbon dioxide capture systems

Insect tracheal systems as inspiration for carbon dioxide capture systems

Polymer Membranes of Zeolitic Imidazole Framework-8 with Sodium Alginate Synthesized from ZIF-8 and Their Application in Light Gas Separation

A Molecular Dynamics Study of Single-Gas and Mixed-Gas N2 and CH4 Transport in Triptycene-Based Polyimide Membranes

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