2019
DOI: 10.1021/acsami.9b01079
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Maximizing Ether Oxygen Content in Polymers for Membrane CO2 Removal from Natural Gas

Abstract: Membrane materials for CO2 removal from natural gas are based on glassy polymers with a high CO2/CH4 diffusivity selectivity. However, these polymers suffer from competitive sorption by heavy hydrocarbons that decreases CO2 permeability and physical aging that reduces gas permeability with time. We circumvent these issues by designing rubbery, solubility-selective polymers with a ratio of ether/ester oxygen to carbon as high as 0.8 through the use of 1,3-dioxolane and 1,3,5-trioxane. The ether/ester oxygen gro… Show more

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Cited by 38 publications
(20 citation statements)
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“…Decreased permeance is attributed to the lower sorption rate of CO 2 due to the lesser concentration of acetate groups. Moreover, steric hindrance that was created mainly by the acetate groups was also reduced, which leads to better packing density results in lower permeability and higher selectivity [13,33]. The findings are in accordance with the abovementioned analysis.…”
Section: Gas Permeation Studysupporting
confidence: 86%
“…Decreased permeance is attributed to the lower sorption rate of CO 2 due to the lesser concentration of acetate groups. Moreover, steric hindrance that was created mainly by the acetate groups was also reduced, which leads to better packing density results in lower permeability and higher selectivity [13,33]. The findings are in accordance with the abovementioned analysis.…”
Section: Gas Permeation Studysupporting
confidence: 86%
“…CO 2 solubility and CO 2 /C 2 H 6 solubility selectivity in these PDXL copolymers are higher than those in PEO, confirming the enhanced affinity towards CO 2 with increasing ether oxygen content. 38 The CO 2 solubility is almost independent of the copolymer composition because the copolymers have almost the same polar DXL content. Therefore, the increase in CO 2 permeability with increasing the PDXLEA content in the copolymers can be ascribed to the increase in the CO 2 diffusivity.…”
Section: Resultsmentioning
confidence: 99%
“…However, most glassy polymeric membranes, including those noted above, tend to show a size-sieving character in the process of separating CO 2 , and thus diffusivity selectivity is more dominant in the gas separation mechanism. , Therefore, this type of membrane has the following limitations: ,, (i) low selectivity to penetrant molecules with similar kinetic diameters , (i.e., CO 2 /N 2 and CO 2 /CH 4 separation; CO 2 = 3.30 Å, N 2 = 3.64 Å, and CO 2 = 3.8 Å); (ii) an aging effect where the nonequilibrium free volume contracts over operating time, thereby leading to deterioration of long-term stability; ,, (iii) reduced CO 2 permeability due to the competitive sorption between hydrocarbon (e.g., CH 4 , C 2 H 6 , etc.) and CO 2 within a gas mixture; and (iv) the separation performance of the membranes (i.e., permeability and selectivity) is significantly affected by their film-forming history. , …”
Section: Introductionmentioning
confidence: 99%