Effect of Gas Solubility on Efficiency of Membrane Processes with Separation of He/CH4 and CO2/CH4 Mixtures as an Example

Kagramanov, G. G.; Gurkin, V. N.; Farnosova, E. N.

doi:10.1134/s251775162004006x

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…47 In a similar study, Donnelly et al reported the lightinduced cross-linking of tyramine-substituted hyaluronate, via the formation of both C−C and C−O bonded phenols. 48 The chemical structure and purity of the materials synthesized in this work were confirmed through their 1 H and 13 C{ 1 H}-NMR spectra recorded mainly in deuterated dimethyl sulfoxide (DMSO-d 6 ) at a temperature of 70 °C. In particular, the 1 H NMR spectra of the prepared copolyimides were used to determine the molar ratio between the specific comonomers within the copolymer's backbone.…”

Section: Resultsmentioning

confidence: 86%

“…Therefore, the permeation through the membrane depends strongly on the solubility and diffusivity of the gas molecules, and the overall membrane performance relies on the difference between the solubility and diffusivity coefficients of those molecules. Hence, introducing new functional groups into the polymer’s backbone can (1) enhance the excess free volume within the membrane structure by altering the interchain packing (i.e., faster diffusion) − or (2) increase the polymer-gas interaction to improve the gas molecules solubility. − …”

Section: Introductionmentioning

confidence: 99%

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Enhanced High-Pressure Mixed-Gas Sieving Properties of Thermally Cross-Linked Polyimide Membranes

Hayek,

Alsamah,

Saleem

et al. 2024

ACS Appl. Polym. Mater.

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Polymeric membranes are susceptible to aging and plasticization, which alters their separation properties since polymeric chain mobility within the membrane matrix is greatly affected. Hence, the implementation of these materials in industrial applications has been limited. However, cross-linking of polymeric membranes is a robust methodology to enhance their physical and mechanical properties. In this regard, thermal cross-linking is advantageous over chemical cross-linking since it could be applied directly to membranes without the addition of exogenous reagents. In this paper, we report the synthesis of a CARDO(OH)-containing copolyimide, amenable to thermal cross-linking due to the hydroxyl groups within the CARDO(OH) monomer. Membranes prepared from the 6FDA-Durene/CARDO(OH) (3:1) copolyimide underwent thermal cross-linking at 200 °C for varying durations (up to 96 h), and their pure- and mixed-gas separation performances were assessed. The mixed-gas studies were conducted under aggressive conditions of high feed pressures (20.7–62.0 bar) and operational temperatures (25–55 °C), aimed to closely simulate real-world scenarios for natural gas purification. Notably, the thermally cross-linked 6FDA-Durene/CARDO(OH) (3:1) for 96 h exhibited a mixed-gas CO2 permeability coefficient of 219 Barrer and a CO2/CH4 selectivity of 26.1 at 34.5 bar and 45 °C. Moreover, the membrane did not show any sign of plasticization under elevated feed pressures of up to 62.0 bar. This work demonstrates the effectiveness of thermal cross-linking in developing high-performance polymeric membranes under realistic conditions of pressure and temperature. Upcoming research endeavors will concentrate on creating and evaluating hollow fiber modules, aiming to replicate similar morphologies employed in industrial applications.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Enhanced High-Pressure Mixed-Gas Sieving Properties of Thermally Cross-Linked Polyimide Membranes

Hayek,

Alsamah,

Saleem

et al. 2024

ACS Appl. Polym. Mater.

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show abstract

“…Therefore, the growing CO 2 partial pressure in the feed gas leading to the contribution of facilitated transport to the total CO 2 permeance decline. As for CH 4 , on the one hand, the solubility coefficient and diffusion coefficient of CH 4 in the membrane decrease with the falling CH 4 partial pressure [ 30 ]. On the other hand, due to the competitive adsorption, the amount of CH 4 adsorbed on the membrane surface tends to downward with the increase of the CO 2 partial pressure.…”

Section: Resultsmentioning

confidence: 99%

Efficient Facilitated Transport Polymer Membrane for CO2/CH4 Separation from Oilfield Associated Gas

Zhang

Sheng

et al. 2021

Membranes

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CO2 enhanced oil recovery (CO2-EOR) technology is a competitive strategy to improve oil field economic returns and reduce greenhouse gas emissions. However, the arbitrary emissions or combustion of the associated gas, which mainly consists of CO2 and CH4, will cause the aggravation of the greenhouse effect and a huge waste of resources. In this paper, the high-performance facilitated transport multilayer composite membrane for CO2/CH4 separation was prepared by individually adjusting the membrane structure of each layer. The effect of test conditions on the CO2/CH4 separation performance was systematically investigated. The membrane exhibits high CO2 permeance of 3.451 × 10−7 mol·m−2·s−1·Pa−1 and CO2/CH4 selectivity of 62 at 298 K and 0.15 MPa feed gas pressure. The cost analysis was investigated by simulating the two-stage system. When the recovery rate and purity of CH4 are 98%, the minimum specific cost of separating CO2/CH4 (45/55 vol%) can be reduced to 0.046 $·Nm−3 CH4. The excellent short-to-mid-term stability indicates the great potential of large industrial application in the CH4 recovery and CO2 reinjection from oilfield associated gas.

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Carbon molecular sieve gas separation materials and membranes: A comprehensive review

Genduso,

Ogieglo,

Wang

et al. 2024

Journal of Membrane Science

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Effect of Gas Solubility on Efficiency of Membrane Processes with Separation of He/CH4 and CO2/CH4 Mixtures as an Example

Cited by 4 publications

References 17 publications

Enhanced High-Pressure Mixed-Gas Sieving Properties of Thermally Cross-Linked Polyimide Membranes

Enhanced High-Pressure Mixed-Gas Sieving Properties of Thermally Cross-Linked Polyimide Membranes

Efficient Facilitated Transport Polymer Membrane for CO2/CH4 Separation from Oilfield Associated Gas

Carbon molecular sieve gas separation materials and membranes: A comprehensive review

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