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Paul Scovazzo - One of the best experts on this subject based on the ideXlab platform.
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Correlations of Low-Pressure Carbon Dioxide and Hydrocarbon Solubilities in Imidazolium-, Phosphonium-, and Ammonium-Based Room-Temperature Ionic Liquids. Part 2. Using Activation Energy of Viscosity
Industrial & Engineering Chemistry Research, 2008Co-Authors: Prem K. Kilaru And, Paul ScovazzoAbstract:This paper provides insights into the dependence of gas solubility on the viscosities of room-temperature ionic liquids (RTILs). Hildebrand solubility parameters are estimated from the activation energy of viscosity via a Proportionality Constant. The solubility of the gases CO2, ethylene, propylene, 1-butene, and 1,3-butadiene at low pressure and Constant temperature are correlated, with the estimated RTIL Hildebrand solubility parameters, into two categories: bis(trifluoromethyl(sulfonyl)imide ([Tf2N]) and non-bis(trifluoromethyl(sulfonyl)imide (non-[Tf2N]) RTILs. The RTILs used in this work are based on 1-alkyl-3-methylimidazolium, quaternary phosphonium, and quaternary ammonium cations. The non-[Tf2N] anions used in the trial set are chloride [Cl], hexafluorophosphate [PF6], trifluoromethanesulfonate [TfO], bis((perflurorethyl)sulfonyl)imide [BETI], dicyanamide [DCA], diethylphosphate [DEP], and dodecylbenzenesulfonate [DBS]. The analysis of the correlation parameters against theory indicates that so...
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correlations of low pressure carbon dioxide and hydrocarbon solubilities in imidazolium phosphonium and ammonium based room temperature ionic liquids part 1 using surface tension
Industrial & Engineering Chemistry Research, 2008Co-Authors: Prem Kilaru, And Ricardo A Condemarin, Paul ScovazzoAbstract:This paper examines the dependence of gas solubility on the surface tension of room-temperature ionic liquids (RTILs). The solubility phenomena of the CO2, ethylene, propylene, 1-butene, and 1,3-butadiene in five imidazolium-, four phosphonium-, and eight ammonium-based RTILs are explained using the Hansen RTIL solubility parameters that were calculated from surface tension measurements. The Hansen solubility parameters were estimated from the surface tensions of the respective RTILs with a Proportionality Constant that is a function of the ratio of the number of nearest-neighbor interactions in the bulk liquid to those on the surface. The calculated solubility parameters are almost independent of temperature. The surface tension solubility parameter model explains the effect of variation of alkyl chain lengths in the cations and the variation of the RTIL anions on gas solubility within an error of ±15%. The analysis may indicate that the CO2−anion interaction is not the dominant factor that determines th...
Prem Kilaru - One of the best experts on this subject based on the ideXlab platform.
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correlations of low pressure carbon dioxide and hydrocarbon solubilities in imidazolium phosphonium and ammonium based room temperature ionic liquids part 1 using surface tension
Industrial & Engineering Chemistry Research, 2008Co-Authors: Prem Kilaru, And Ricardo A Condemarin, Paul ScovazzoAbstract:This paper examines the dependence of gas solubility on the surface tension of room-temperature ionic liquids (RTILs). The solubility phenomena of the CO2, ethylene, propylene, 1-butene, and 1,3-butadiene in five imidazolium-, four phosphonium-, and eight ammonium-based RTILs are explained using the Hansen RTIL solubility parameters that were calculated from surface tension measurements. The Hansen solubility parameters were estimated from the surface tensions of the respective RTILs with a Proportionality Constant that is a function of the ratio of the number of nearest-neighbor interactions in the bulk liquid to those on the surface. The calculated solubility parameters are almost independent of temperature. The surface tension solubility parameter model explains the effect of variation of alkyl chain lengths in the cations and the variation of the RTIL anions on gas solubility within an error of ±15%. The analysis may indicate that the CO2−anion interaction is not the dominant factor that determines th...
Prem K. Kilaru And - One of the best experts on this subject based on the ideXlab platform.
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Correlations of Low-Pressure Carbon Dioxide and Hydrocarbon Solubilities in Imidazolium-, Phosphonium-, and Ammonium-Based Room-Temperature Ionic Liquids. Part 2. Using Activation Energy of Viscosity
Industrial & Engineering Chemistry Research, 2008Co-Authors: Prem K. Kilaru And, Paul ScovazzoAbstract:This paper provides insights into the dependence of gas solubility on the viscosities of room-temperature ionic liquids (RTILs). Hildebrand solubility parameters are estimated from the activation energy of viscosity via a Proportionality Constant. The solubility of the gases CO2, ethylene, propylene, 1-butene, and 1,3-butadiene at low pressure and Constant temperature are correlated, with the estimated RTIL Hildebrand solubility parameters, into two categories: bis(trifluoromethyl(sulfonyl)imide ([Tf2N]) and non-bis(trifluoromethyl(sulfonyl)imide (non-[Tf2N]) RTILs. The RTILs used in this work are based on 1-alkyl-3-methylimidazolium, quaternary phosphonium, and quaternary ammonium cations. The non-[Tf2N] anions used in the trial set are chloride [Cl], hexafluorophosphate [PF6], trifluoromethanesulfonate [TfO], bis((perflurorethyl)sulfonyl)imide [BETI], dicyanamide [DCA], diethylphosphate [DEP], and dodecylbenzenesulfonate [DBS]. The analysis of the correlation parameters against theory indicates that so...
And Ricardo A Condemarin - One of the best experts on this subject based on the ideXlab platform.
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correlations of low pressure carbon dioxide and hydrocarbon solubilities in imidazolium phosphonium and ammonium based room temperature ionic liquids part 1 using surface tension
Industrial & Engineering Chemistry Research, 2008Co-Authors: Prem Kilaru, And Ricardo A Condemarin, Paul ScovazzoAbstract:This paper examines the dependence of gas solubility on the surface tension of room-temperature ionic liquids (RTILs). The solubility phenomena of the CO2, ethylene, propylene, 1-butene, and 1,3-butadiene in five imidazolium-, four phosphonium-, and eight ammonium-based RTILs are explained using the Hansen RTIL solubility parameters that were calculated from surface tension measurements. The Hansen solubility parameters were estimated from the surface tensions of the respective RTILs with a Proportionality Constant that is a function of the ratio of the number of nearest-neighbor interactions in the bulk liquid to those on the surface. The calculated solubility parameters are almost independent of temperature. The surface tension solubility parameter model explains the effect of variation of alkyl chain lengths in the cations and the variation of the RTIL anions on gas solubility within an error of ±15%. The analysis may indicate that the CO2−anion interaction is not the dominant factor that determines th...
G Wibberenz - One of the best experts on this subject based on the ideXlab platform.
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a 22 year dependence in the size of near ecliptic corotating cosmic ray depressions during five solar minima
Journal of Geophysical Research, 1999Co-Authors: I G Richardson, H V Cane, G WibberenzAbstract:Evidence is presented for a 22-year cycle in the amplitude of recurrent, near-Earth, near-Ecliptic, galactic cosmic ray modulations during the solar minimum periods in the mid-1950s to mid-1990s. These modulations are ∼50% larger during A > 0 epochs than during A 0 epochs. A change in the latitudinal GCR gradient in successive epochs is unlikely to be the sole reason for the change in depression size since (1) the Proportionality Constant between the recurrent depressions and latitudinal gradient depends on A, and (2) the cosmic ray density is not organized by crossings of the heliospheric current sheet.
