2 Organic Compounds, C0 to C84

Dykyj, J.; Svoboda, Ján; Wilhoit, R. C.; Frenkel, Michael; Hall, Kenneth R.

doi:10.1007/10688591_3

Cited by 5 publications

(5 citation statements)

References 376 publications

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“…The strong effect of RTIL−solute interactions is most readily apparent when considering the range of solute retention factors against the range of solute vapor pressures. At 313 K, for example, the solute retention factors range well within 3 orders of magnitude (see Tables and ), whereas the solute vapor pressures , span across more than 5 orders of magnitude (anisole 1148 Pa, pyrene 3.6 × 10 -3 Pa). To separate the effect of solute volatility from the effects of solute−RTIL and solute−scCO 2 interactions, it is expedient to consider the quantity ( K cA / K cB )( P A sat / P B sat ), where P A sat and P B sat are the vapor pressure of solute A and the vapor pressure of naphthalene at the particular temperature, respectively.…”

Section: Resultsmentioning

confidence: 96%

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO₂ from Capillary-Column Chromatography

Planeta

Roth

2005

J. Phys. Chem. B

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Open-tubular capillary-column supercritical fluid chromatography (SFC) with the room-temperature ionic liquid (RTIL) 1-n-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) as the stationary liquid and supercritical carbon dioxide (scCO2) as the mobile phase was employed to measure solute retention factors within 313-353 K and 8.1-23.2 MPa. The selection of solutes included 18 compounds of diverse volatilities and chemical functionalities. The retention factors were converted to infinite-dilution solute partition coefficients in the biphasic [bmim][BF4]-scCO2 system. At a constant temperature, an increase in scCO2 density produced distinct shifts in relative retention (=separation factor), thus providing some pressure-tunable selectivity. At a particular temperature and density of CO2, solute partition coefficients can be correlated in terms of linear solvation energy relationships. This important finding indicates a future possibility to estimate the partitioning data in RTIL-scCO2 systems using limited experimental information and the molecular descriptors available for a large variety of prospective solutes. Analysis of the relative retention data by regular solution theory resulted in approximate values of the solubility parameter of CO2-expanded [bmim][BF4].

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Section: Resultsmentioning

confidence: 96%

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO₂ from Capillary-Column Chromatography

Planeta

Roth

2005

J. Phys. Chem. B

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“…To calculate the molar volumes of subcooled liquid solutes, one can use a modified form of the Rackett equation employing a reference density and the critical properties estimated from the Joback correlation . The solubility parameters of the subcooled liquid solutes then result from combining the molar volumes with the cohesive energies obtained from vaporization enthalpy data or from vapor pressure equations . Figure shows the estimations of δ s obtained with anisole and α-ionone as the test solutes.…”

Section: Resultsmentioning

confidence: 99%

Limiting Partition Coefficients of Solutes in Biphasic Trihexyltetradecylphosphonium Chloride Ionic Liquid−Supercritical CO₂ System: Measurement and LSER-Based Correlation

2007

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Limiting partition coefficients of a selection of low-to-medium volatility solutes between both phases in a biphasic trihexyltetradecylphosphonium chloride ([thtdp][Cl]) ionic liquid (IL)-supercritical carbon dioxide (scCO2) system were obtained by capillary column chromatography with [thtdp][Cl] as the stationary liquid and scCO2 as the carrier fluid. It is shown that supercritical fluid chromatography can be used to probe the partitioning behavior of solutes in biphasic IL-scCO2 systems even when the IL has nonzero solubility in scCO2. Relative partition coefficients of solutes at a particular temperature and density of CO2 can be correlated within Abraham's linear solvation energy relationships. Compared with our previous results in a [bmim][BF4]-scCO2 system, the solute partition coefficients in the [thtdp][Cl]-scCO2 system are more sensitive to the solute hydrogen bond acidity descriptor.

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“…To calculate the molar volumes of (subcooled) liquid solutes, one can use a modified form of the Rackett equation employing a reference density and the critical properties estimated from the Joback correlation . The solubility parameters of the (subcooled) liquid solutes then result from combining the molar volumes with the cohesive energies obtained from vaporization enthalpy data or from vapor pressure equations . At a particular temperature and pressure, the pertinent value of δ m can be derived from the EOS of Span and Wagner …”

Section: Data Reductionmentioning

confidence: 99%

Partition Coefficients of Low-Volatility Solutes in the Ionic Liquid 1-n-Butyl-3-methylimidazolium Hexafluorophosphate−Supercritical CO₂ System from Chromatographic Retention Measurements

Planeta

Roth

2004

J. Phys. Chem. B

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Room temperature ionic liquid (RTIL) 1-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) was employed as the stationary liquid in capillary column chromatography with supercritical carbon dioxide (scCO 2 ) as the mobile phase. Open tubular capillary columns were used to measure the retention factors of anisole, azulene, benzil, R-ionone, naphthalene, pyrene, and veratrole within 313-353 K and 8.1-23.2 MPa. The retention factors were converted to infinite-dilution solute partition coefficients in the [bmim][PF 6 ]-scCO 2 system. Analysis of the relative retention data by regular solution theory resulted in approximate values of the solubility parameter of CO 2 -expanded [bmim] [PF 6 ]. Open tubular supercritical fluid chromatography appears to provide a viable method for rapid acquisition of partitioning data on low-volatility solutes in biphasic RTIL-scCO 2 systems.

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2 Organic Compounds, C0 to C84

Cited by 5 publications

References 376 publications

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO₂ from Capillary-Column Chromatography

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO₂ from Capillary-Column Chromatography

Limiting Partition Coefficients of Solutes in Biphasic Trihexyltetradecylphosphonium Chloride Ionic Liquid−Supercritical CO₂ System: Measurement and LSER-Based Correlation

Partition Coefficients of Low-Volatility Solutes in the Ionic Liquid 1-n-Butyl-3-methylimidazolium Hexafluorophosphate−Supercritical CO₂ System from Chromatographic Retention Measurements

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2 Organic Compounds, C0 to C84

Cited by 5 publications

References 376 publications

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO2 from Capillary-Column Chromatography

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO2 from Capillary-Column Chromatography

Limiting Partition Coefficients of Solutes in Biphasic Trihexyltetradecylphosphonium Chloride Ionic Liquid−Supercritical CO2 System: Measurement and LSER-Based Correlation

Partition Coefficients of Low-Volatility Solutes in the Ionic Liquid 1-n-Butyl-3-methylimidazolium Hexafluorophosphate−Supercritical CO2 System from Chromatographic Retention Measurements

Contact Info

Product

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About

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO₂ from Capillary-Column Chromatography

Solute Partitioning between the Ionic Liquid 1-n-Butyl-3-methylimidazolium Tetrafluoroborate and Supercritical CO₂ from Capillary-Column Chromatography

Limiting Partition Coefficients of Solutes in Biphasic Trihexyltetradecylphosphonium Chloride Ionic Liquid−Supercritical CO₂ System: Measurement and LSER-Based Correlation

Partition Coefficients of Low-Volatility Solutes in the Ionic Liquid 1-n-Butyl-3-methylimidazolium Hexafluorophosphate−Supercritical CO₂ System from Chromatographic Retention Measurements