The gas separation performance adjustment of carbon molecular sieve membrane depending on the chain rigidity and free volume characteristic of the polymeric precursor

Hu, Chun-Po; Polintan, Clarisse K.; Tayo, Lemmuel L.; Chou, Shang‐Chih; Tsai, Hui-An; Hung, Wei‐Song; Lee, Kueir‐Rarn; Lai, Juin‐Yih

doi:10.1016/j.carbon.2018.11.037

Cited by 55 publications

(15 citation statements)

References 42 publications

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“…Figure 10 shows plots of oxygen permeation behaviors for CMSMs. Table 8 lists the detailed data [ 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 ]. There are many plots for CMSMs above the 2015 upper bound line for organic polymers.…”

Section: Simultaneous Improvements Of Selectivity and Permeability Of Polymer Membranesmentioning

confidence: 99%

Macromolecular Design for Oxygen/Nitrogen Permselective Membranes—Top-Performing Polymers in 2020—

et al. 2021

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Oxygen/nitrogen permselective membranes play particularly important roles in fundamental scientific studies and in a number of applications in industrial chemistry, but have not yet fulfilled their full potential. Organic polymers are the main materials used for such membranes because of the possibility of using sophisticated techniques of precise molecular design and their ready processability for making thin and large self-supporting membranes. However, since the difference in the properties of oxygen and nitrogen gas molecules is quite small, for example, their kinetic diameters are 3.46 Å and 3.64 Å, respectively, the architectures of the membrane macromolecules should be designed precisely. It has been reported often that oxygen permeability (PO2) and oxygen permselectivity (α = PO2/PN2) have trade-off relationships for symmetric membranes made from pure polymers. Some empirical upper bound lines have been reported in (ln α − ln PO2) plots since Robeson reported an upper bound line in 1991 for the first time. The main purpose of this review is to discuss suitable macromolecular structures that produce excellent oxygen/nitrogen permselective membranes. For this purpose, we first searched extensively and intensively for papers which had reported α and PO2 values through symmetric dense membranes from pure polymers. Then, we examined the chemical structures of the polymers showing the top performances in (ln α − ln PO2) plots, using their aged performances. Furthermore, we also explored progress in the molecular design in this field by comparing the best polymers reported by 2013 and those subsequently found up to now (2020) because of the rapid outstanding growth in this period. Finally, we discussed how to improve α and PO2 simultaneously on the basis of reported results using not only symmetric membranes of pure organic polymers but also composite asymmetric membranes containing various additives.

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Section: Simultaneous Improvements Of Selectivity and Permeability Of Polymer Membranesmentioning

confidence: 99%

Macromolecular Design for Oxygen/Nitrogen Permselective Membranes—Top-Performing Polymers in 2020—

et al. 2021

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“…Table 1 shows the influencing factors to be discussed as the independent variables based on the structural characterization and gas permeability [34][35][36][37][38][39][40][41][42][43], including the precursor characteristic, carbonization condition, carbon microstructure, and molecular property of permeated gases. Among the characteristics of polymeric precursors, the fractional free volume (FFV) and the carbon residue influencing the porosity of CMS membrane were selected as the influential factors [44][45][46], as well as the fraction of sp2 carbon and aromatic carbon affecting the arrangement of carbon molecules [47,48]. The pyrolysis temperature, which is particularly applicable to the structural adjustment of CMS membrane, was chosen as an influencing factor [49].…”

Section: Data Collectionmentioning

confidence: 99%

Analysis of Influencing Factors on the Gas Separation Performance of Carbon Molecular Sieve Membrane Using Machine Learning Technique

et al. 2022

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Gas separation performance of the carbon molecular sieve (CMS) membrane is influenced by multiple factors including the microstructural characteristics of carbon and gas properties. In this work, the support vector regression (SVR) method as a machine learning technique was applied to the correlation between the gas separation performance, the multiple membrane structure, and gas characteristic factors of the self-manufactured CMS membrane. A simple quantitative index based on the Robeson’s upper bound line, which indicated the gas permeability and selectivity simultaneously, was proposed to measure the gas separation performance of CMS membrane. Based on the calculation results, the inferred key factors affecting the gas permeability of CMS membrane were the fractional free volume (FFV) of the precursor, the average interlayer spacing of graphite-like carbon sheet, and the final carbonization temperature. Moreover, the most influential factors for the gas separation performance were supposed to be the two structural factors of precursor influencing the porosity of CMS membrane, the carbon residue and the FFV, and the ratio of the gas kinetic diameters. The results would be helpful to the structural optimization and the separation performance improvement of CMS membrane.

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“…These parameters are permeability and selectivity [18]; however, the optimization procedure is an immense challenge to develop the membranes and to use them for separating the gas mixture. Further, it is clearly understood that high permeability denotes a low selectivity, and vice versa [19].…”

Section: Introductionmentioning

confidence: 99%

“…Huge groups of polymers were used to prepare membranes, including matrimid ® , polysulfones (PSF), polyethersulfone (PES), and rubbery polymers like polyethylene glycol, PEBAX ® , PDMS, and polyurethanes (PUs), etc. [18,25]. It is noteworthy to mention in this context that the PSF are widely used for membrane fabrication due to their low costs and high thermal and chemical resistance to solvents.…”

Section: Introductionmentioning

confidence: 99%

Influence of Casting Solvents on CO2/CH4 Separation Using Polysulfone Membranes

et al. 2021

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Polysulfone membranes exhibit resistance to high temperature with low manufacturing cost and high efficiency in the separation process. The composition of gases is an important step that estimates the efficiency of separation in membranes. As membrane types are currently becoming in demand for CO2/CH4 segregation, polysulfone will be an advantageous alternative to have in further studies. Therefore, research is undertaken in this study to evaluate two solvents: chloroform (CF) and tetrahydrofuran (THF). These solvents are tested for casting polymeric membranes from polysulfone (PSF) to separate every single component from a binary gas mixture of CO2/CH4. In addition, the effect of gas pressure was conducted from 1 to 10 bar on the behavior of the permeability and selectivity. The results refer to the fact that the maximum permeability of CO2 and CH4 for THF is 62.32 and 2.06 barrer at 1 and 2 bars, respectively. Further, the maximum permeability of CF is 57.59 and 2.12 barrer at 1 and 2 bars, respectively. The outcome selectivity values are 48 and 36 for THF and CF at 1 bar, accordingly. Furthermore, the study declares that with the increase in pressure, the permeability and selectivity values drop for CF and THF. The performance for polysulfone (PSF) membrane that is manufactured with THF is superior to that of CF relative to the Robeson upper bound. Therefore, through the results, it can be deduced that the solvent during in-situ synthesis has a significant influence on the gas separation of a binary mixture of CO2/CH4.

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The gas separation performance adjustment of carbon molecular sieve membrane depending on the chain rigidity and free volume characteristic of the polymeric precursor

Cited by 55 publications

References 42 publications

Macromolecular Design for Oxygen/Nitrogen Permselective Membranes—Top-Performing Polymers in 2020—

Macromolecular Design for Oxygen/Nitrogen Permselective Membranes—Top-Performing Polymers in 2020—

Analysis of Influencing Factors on the Gas Separation Performance of Carbon Molecular Sieve Membrane Using Machine Learning Technique

Influence of Casting Solvents on CO2/CH4 Separation Using Polysulfone Membranes

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