Gas separation performance and physical aging of tubular thin-film composite carbon molecular sieve membranes based on a polyimide of intrinsic microporosity precursor

Ogieglo, Wojciech; Puspasari, Tiara; Alabdulaaly, Abdullah; Nguyen, Thi Phuong Nga; Lai, Zhiping; Pinnau, Ingo

doi:10.1016/j.memsci.2022.120497

Cited by 19 publications

(7 citation statements)

References 47 publications

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“…To date, the most common method of light hydrocarbon separation is cryogenic distillation, which is energy-consuming and ineffective in many technological processes . The well-known membrane gas separation technique based on the diffusion-kinetic principle has a number of disadvantages associated with its reliability and durability caused by membrane degradation and fragility. , As follows from the Robeson plot, the selectivity of membranes deteriorates with increasing permeability . In turn, gas separation by means of adsorption onto porous materials appears to be a more reliable and energy-efficient alternative, which is confirmed by the widespread use of PSA (pressure swing adsorption), VSA (vacuum swing adsorption), and TSA (temperature swing adsorption) processes in the industry, especially in low-capacity systems, which are becoming much-in-demand. − Nevertheless, improvement in the performance of adsorption-based gas separation technologies requires rational approaches to synthesize highly efficient and reliable adsorbents with a tailored porous structure.…”

Section: Introductionmentioning

confidence: 98%

“…3 The wellknown membrane gas separation technique based on the diffusion-kinetic principle has a number of disadvantages associated with its reliability and durability caused by membrane degradation and fragility. 3,4 As follows from the Robeson plot, the selectivity of membranes deteriorates with increasing permeability. 5 In turn, gas separation by means of adsorption onto porous materials appears to be a more reliable and energyefficient alternative, which is confirmed by the widespread use of PSA (pressure swing adsorption), VSA (vacuum swing adsorption), and TSA (temperature swing adsorption) processes in the industry, especially in low-capacity systems, which are becoming much-in-demand.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Nanoporous Carbon Structures on High-Pressure Adsorption Separation of Light Hydrocarbons

et al. 2023

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Four activated carbons (ACs) prepared from polymers (PMB, P-300), wood waste (S-1), and silicon carbide (AUK) by chemical and physical activation were investigated as potential adsorbents for ethane/methane mixture separation. Their textural properties were compared by performing scanning electron microscopy, X-ray, and CHNS/O elemental analysis. N 2 and CO 2 adsorption interpreted in terms of the theory of volume filling of micropores, non-local density functional theory (NLDFT), and Brunauer−Emmett−Teller (BET) models revealed very different porosity features of these ACs. The adsorption of pure ethane and methane onto all of the ACs was measured at pressures up to 50 bar and temperatures of 303−333 K in order to evaluate their adsorption selectivity for a methane/ethane mixture using the IAST method. The calculations indicated that ACs with the largest mean pore sizes, P-300 and PBM, are least suitable for adsorption-based separation of the ethane/methane mixture since they demonstrated a relatively strong dependence of selectivity coefficient (SF) on pressure and temperature. AUK showed the highest value of SF for ethane at low pressures (up to 5 bar), reaching 18 at 303 K for the mixture 95/5% CH 4 /C 2 H 6 . Finally, S-1 was found to be the most efficient adsorbent for the ethane/methane separation since it demonstrated a relatively high separation performance in a pressure range of 2−50 bar with almost no reduction in separation performance. In general, the SF value of ACs for ethane correlated with the difference between the initial differential isosteric heats of ethane and methane adsorption as well as with the presence of high-energy adsorption centers as narrow micropores with size less than 1 nm and heteroatoms (N,O). Molecular dynamics simulations of the adsorption of the methane/ethane mixture onto the model carbon adsorbents also indicated the influence of pore width on selective capacity.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Influence of Nanoporous Carbon Structures on High-Pressure Adsorption Separation of Light Hydrocarbons

et al. 2023

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“…In previous reports, attempts have been made on developing CMS TFC membranes. A large number of polymers (e.g., PI, cellulose, PEI, PIMs) have been used as precursors to prepare CMS membranes, while the selection of porous support is quite limited, including Al 2 O 3 ceramic, anodized aluminum, and sometimes stainless steel . In most cases, these CMS TFC membranes were fabricated by dip-coating the porous support for a period of time, followed by drying it and carbonizing the polymeric layer at high temperature conditions (e.g., 700–800 °C).…”

Section: Introductionmentioning

confidence: 99%

Thin-Film-Composite Carbon Molecular Sieve Membranes for Efficient Helium and Hydrogen Separation

Feng,

Guo,

Deng

et al. 2023

Ind. Eng. Chem. Res.

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Carbon molecular sieve (CMS) membranes have been proven to be effective gas separation membranes, especially for light gas separation. In the current work, Troger's base polymer (TB)/poly(styrene sulfonic acid) (PSS) thin-film-composite (TFC) carbon molecular sieve (CMS) membranes were prepared by dip-coating and subsequent carbonization. Porous anodic aluminum oxide (AAO) plates were employed as the support layer, and carboxylated nanocellulose fiber (CNF) was used as the sacrificed layer. The effects of membrane preparation conditions, including solution concentration and carbonization temperature, and operating conditions, such as feed pressure and test temperature, on the hydrogen (H 2 ) and helium (He) separation performance were systematically investigated. Meanwhile, the relationship between gas separation performances and the microstructure of TFC CMS membranes was explored by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectrum. With a carbonization temperature of 550 °C, the H 2 /CH 4 (149.25), H 2 /N 2 (131.04), He/CH 4 (137.07), and He/N 2 (120.35) selectivity of the TB/PSS membrane prepared at a solution concentration of 10 wt % was significantly higher than other TFC CMS membranes, and the H 2 and He permeances were 1359.73 GPU and 1248.49 GPU under a feed pressure of 2 bar, respectively. The excellent gas separation performance of this membrane demonstrates its great potential for H 2 and He purification applications.

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“…The selectivity of both CO 2 /N 2 and CO 2 /CH 4 increased with decreasing coating solution concentration, which might be attributed to fewer defects because of better interaction between PIM-1 and the support due to solution soaking. 32 The same trend of decreasing permeance with decreasing coating solution concentration was observed for PIM-1 membranes prepared from CHCl 3 solutions using the same support, but the selectivity change was small. In addition, for the same coating solution concentration, the CO 2 permeance of PIM-1 TFC membranes prepared from CHCl 3 was higher than that prepared from THF.…”

mentioning

confidence: 99%

“…Though a thinner active layer should be obtained, the mixed PIM-1/PAN interface caused additional gas transport resistance, which resulted in decreased gas permeance. The selectivity of both CO 2 /N 2 and CO 2 /CH 4 increased with decreasing coating solution concentration, which might be attributed to fewer defects because of better interaction between PIM-1 and the support due to solution soaking . The same trend of decreasing permeance with decreasing coating solution concentration was observed for PIM-1 membranes prepared from CHCl 3 solutions using the same support, but the selectivity change was small.…”

mentioning

confidence: 99%

Methanol Vapor Retards Aging of PIM-1 Thin Film Composite Membranes in Storage

Foster

Scholes

et al. 2023

ACS Macro Lett.

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Physical aging of glassy polymers leads to a decrease in permeability over time when they are used in membranes. This hinders the industrial application of high free volume polymers, such as the archetypal polymer of intrinsic microporosity PIM-1, for membrane gas separation. In thin film composite (TFC) membranes, aging is much more rapid than in thicker self-standing membranes, as rearrangement within the thin active layer is relatively fast. Liquid alcohol treatment, which swells the membrane, is often used in the laboratory to rejuvenate aged self-standing membranes, but this is not easily applied on an industrial scale and is not suitable to refresh TFC membranes because of the risk of membrane delamination. In this work, it is demonstrated that a simple method of storage in an atmosphere of methanol vapor effectively retards physical aging of PIM-1 TFC membranes. The same method can also be utilized to refresh aged PIM-1 TFC membranes, and one-week methanol vapor storage is sufficient to recover most of the original CO2 permeance.

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Gas separation performance and physical aging of tubular thin-film composite carbon molecular sieve membranes based on a polyimide of intrinsic microporosity precursor

Cited by 19 publications

References 47 publications

Influence of Nanoporous Carbon Structures on High-Pressure Adsorption Separation of Light Hydrocarbons

Influence of Nanoporous Carbon Structures on High-Pressure Adsorption Separation of Light Hydrocarbons

Thin-Film-Composite Carbon Molecular Sieve Membranes for Efficient Helium and Hydrogen Separation

Methanol Vapor Retards Aging of PIM-1 Thin Film Composite Membranes in Storage

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