Selective Separation of Polar Unsaturated Organics Using a Water Stationary Phase in Gas Chromatography

Marno, Amberley R.; Thurbide, Kevin B.

doi:10.1007/s10337-021-04125-9

Cited by 4 publications

(1 citation statement)

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“…To successfully exploit the olefin complexation capability of silver(I) ions in gas separation systems, the selection of appropriate solvents is critical. Solvents such as water and methanol have been used previously as they generally exhibit high solubility of silver(I) salts. − However, at elevated temperatures, these solvents can undergo volatilization, resulting in decreased separation performance . Ionic liquids (ILs) are versatile nonmolecular solvents possessing low vapor pressure and high thermal stability and can be structurally tuned using various cation and anion combinations .…”

Section: Introductionmentioning

confidence: 99%

Deconvoluting the Combined Effects of Gas Composition and Temperature on Olefin Selectivity for Separations Using Silver(I) Ions in Ionic Liquids

et al. 2022

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Silver(I) ions have the propensity of undergoing reduction to form metallic silver within olefin/paraffin separation systems when they are subjected to hydrogen at elevated temperatures. Ionic liquids (ILs) are versatile solvents known for their low vapor pressure, high thermal stability, and structural tunability and have been shown to minimize hydrogen-induced reduction of silver(I) ions when employed as solvents. In the development of robust separation platforms that employ silver(I) ions, it is essential to deploy reliable approaches capable of measuring and assessing the factors that lower the overall separation performance. In this study, silver(I) ions dissolved in an imidazolium-based IL are subjected to mixed gas streams composed of hydrogen, nitrogen, and methane under varying temperatures. Using inverse gas chromatography, a total of 44 columns with stationary phases containing four different concentrations of silver(I) bis[(trifluoromethyl)sulfonyl]imide ([Ag+][NTf2 –]) dissolved in the 1-decyl-3-methylimidazolium ([C10MIM+]) [NTf2 –] IL were used to measure partition coefficients of olefins and paraffins, as well as aromatics, esters, and ketones. Upon exposing the stationary phases to mixed gases at elevated temperatures, olefin partitioning between the silver(I) ion pseudophase and the two other phases (i.e., carrier gas and IL stationary phase) was observed to decrease over time, while partitioning between the IL stationary phase and carrier gas remained unchanged. It was found that exposure gases composed of 5.0 to 85.0 mol % hydrogen and temperatures ranging from 95 to 130 °C resulted in a remarkable acceleration of silver(I) ion reduction and an approximate 36.4–61.3% decrease in olefin partitioning between the silver(I) ion pseudophase and both the carrier gas and IL stationary phase after 60 h. While binary mixtures of hydrogen and nitrogen resulted in a continuous decrease in silver(I) ion–olefin complexation capability, a ternary gas mixture produced varied silver(I) ion reduction kinetics.

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Section: Introductionmentioning

confidence: 99%

Deconvoluting the Combined Effects of Gas Composition and Temperature on Olefin Selectivity for Separations Using Silver(I) Ions in Ionic Liquids

et al. 2022

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A Bromine-Terminated Triblock Copolymer (Br-PCL-PDMS-PCL-Br) as the Stationary Phase for Gas Chromatography Analysis

et al. 2022

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A Method to Externally Adjust the Column Length in Gas Chromatography Using a Water Stationary Phase

Shepherd,

Thurbide

2023

Chromatographia

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Selective Separation of Polar Unsaturated Organics Using a Water Stationary Phase in Gas Chromatography

Abstract: Marno Jones, A. (2022). Selective separation of polar unsaturated organics using a water stationary phase in gas chromatography (Unpublished master's thesis).

Cited by 4 publications

References 50 publications

Deconvoluting the Combined Effects of Gas Composition and Temperature on Olefin Selectivity for Separations Using Silver(I) Ions in Ionic Liquids

Deconvoluting the Combined Effects of Gas Composition and Temperature on Olefin Selectivity for Separations Using Silver(I) Ions in Ionic Liquids

A Bromine-Terminated Triblock Copolymer (Br-PCL-PDMS-PCL-Br) as the Stationary Phase for Gas Chromatography Analysis

A Method to Externally Adjust the Column Length in Gas Chromatography Using a Water Stationary Phase

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