Separation performance of poly(urethane–urea) membranes in the separation of C2 and C3 hydrocarbons from methane

Khosravi, Afsaneh; Sadeghi, Morteza

doi:10.1016/j.memsci.2013.01.025

Cited by 32 publications

(35 citation statements)

References 36 publications

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“…The adsorption of H 2 S in membrane makes the membrane media more compatible with polar groups, leading to a decline in the solubility of nonpolar CH 4 gas and in turn to a decline in the CH 4 permeability. The CO 2 permeability and the “CO 2 /gas” selectivities improved more with its concentration than those of N 2 and CH 4 ,…”

Section: Resultsmentioning

confidence: 94%

Novel Application of a Polyurethane Membrane for Efficient Separation of Hydrogen Sulfide from Binary and Ternary Gas Mixtures

et al. 2018

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Recently we introduced a new polyurethane (PU) membrane synthesized from polypropylene glycol (PPG), hexamethylene diisocyanate (HDI), and 1, 4-butane diol (BDO), and then studied the performance of the membrane for CO 2 removal. This paper presents a novel application of the PPG-HDI-BDO membrane for separation of H 2 S in binary and ternary gas mixtures. The gas transport properties of the membrane in binary H 2 S/CH 4 and ternary CH 4 /CO 2 /H 2 S gas mixtures at different temperatures, pressures, and gas compositions are investigated. Permeation tests show that the membrane has a high H 2 S/CH 4 selectivity (27.2), an outstanding H 2 S permeability of 790 Barrer, and a remarkable CO 2 permeability of 473 Barrer. The H 2 S permeability of 790 Barrer is the highest reported to this date for all PU membranes. The H 2 S permeability and H 2 S/ CH 4 selectivity of the membrane increases with temperature. As the operating pressure increases, the CO 2 /CH 4 and H 2 S/CH 4 selectivities of the membrane increases. H 2 S and CO 2 permeabilities and H 2 S/CH 4 and CO 2 /CH 4 selectivities increase, as the H 2 S content of the feed increases. Solubility is most likely the dominant mechanism of gas permeation in this membrane. As the CO 2 content of the feed stream increases, the H 2 S permeability and H 2 S/CH 4 selectivity of the membrane decreases. The membrane has maximum H 2 S/CH 4 selectivities of 27.4 in binary H 2 S/CH 4 (with 0.075 mol% H 2 S) and 27.2 in ternary CH 4 /CO 2 /H 2 S (with 0.66 mol% H 2 S).[a] Dr.

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Section: Resultsmentioning

confidence: 94%

Novel Application of a Polyurethane Membrane for Efficient Separation of Hydrogen Sulfide from Binary and Ternary Gas Mixtures

et al. 2018

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“…While the solubility or the sorption of gases in the polymer is a thermodynamic property that depends on the condensability of the gases and the interaction between the polymer and gas molecules. [42] In the glassy polymers, because of their rigid structure and the vacancy of chain mobility, the permeation of gases in polymer defined by diffusivity ability of the gases in polymer and the diffusion mechanism is dominant. Although, based on this mechanism, the structure of the membrane changed to stiffer chains or because of reduction in the free volumes in the polymer, the diffusion of gases would decrease through the polymer matrix.…”

Section: Gas Permeation Test Resultsmentioning

confidence: 99%

“…As shown, two peaks in the FTIR spectra of silica/ CA composite membrane were assigned to the groups bonding between polymer chain and silica. [2,42] HBI value is specified by the ratio of carbonyl bands: The peaks appeared at the range of the 1,650 to 1,750 cm −1 represent the carbonyl stretching in polymer.…”

Section: Gas Permeation Testsmentioning

confidence: 99%

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Gas permeation properties of cellulose acetate/silica nanocomposite membrane

et al. 2017

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In this study, the effects of silica nanoparticles on the permeability of pure CO 2 , O 2, and N 2 gases in cellulose acetate (CA) membrane have been studied. Silica particles were prepared via the sol-gel method through the hydrolysis of tetraethyl orthosilicate (TEOS). CA and CA/silica nanocomposite membranes were prepared by thermal phase inversion method. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and Fourier transfer infrared (FTIR) analyses were employed to characterize the CA and CA/silica nanocomposite membranes. Gas permeation experiments showed an increase in the permeability of CO 2 from 6.32 to 7.3 barrer and a reduction in the permeability of N 2 from 0.18 to 0.09 barrer with the increment in silica content of the prepared composite membranes up to 20 wt%. Therefore, CO 2 /N 2 selectivity of the nanocomposite membranes increased by increasing the silica content in the polymer matrix from 30 to 80 for 20 wt% load of silica. K E Y W O R D Scellulose acetate, gas permeation, membrane, nanocomposite, silica How to cite this article: Najafi M, Sadeghi M, Bolverdi A, Pourafshari Chenar M, Pakizeh M. Gas permeation properties of cellulose acetate/silica nanocomposite membrane.

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“…There are two main methods of enrichment of low-concentration methane. Chemical methane membrane separation technology [19,20], using a thermal flow reversal reactor, has been shown to increase methane concentrations from 0.22-0.42 vol. % to 89.7-97.5 vol.…”

Section: Introductionmentioning

confidence: 99%

Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions

Wen

Wang

et al. 2018

Energies

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Abstract:The massive emission of low concentrations (≤0.5%) of methane (CH 4 ) from ventilation roadways results in resource waste and environmental pollution. To mitigate these emissions, an enrichment tower for low-concentration methane is designed, and segregation and non-segregation experiments are conducted. The results reveal that stable concentrations of methane under segregation and non-segregation states in the enrichment tower gradually increase with height, with a maximum methane concentration of 0.64% and 0.54%, respectively. This shows that the methane enrichment effect in free diffusion conditions is more significant under the segregation state than under the non-segregation state. The stable concentration of methane in the middle and upper sections of the enrichment tower shows an increasing trend. However, the stable concentration of methane in the lower section of the enrichment tower has an increasing trend (less than 0.50%). According to the methane molecule Boltzmann distribution law, methane concentration enrichment decreases with height, and the conversion of the methane from the segregated to non-segregated is irreversible. Consequently, industrial applications of methane enrichment from buoyant forces are not feasible for low concentrations of methane.

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Separation performance of poly(urethane–urea) membranes in the separation of C2 and C3 hydrocarbons from methane

Cited by 32 publications

References 36 publications

Novel Application of a Polyurethane Membrane for Efficient Separation of Hydrogen Sulfide from Binary and Ternary Gas Mixtures

Novel Application of a Polyurethane Membrane for Efficient Separation of Hydrogen Sulfide from Binary and Ternary Gas Mixtures

Gas permeation properties of cellulose acetate/silica nanocomposite membrane

Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions

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