Gas-Expanded Liquids

Jessop, Philip G.; Subramaniam, Bala

doi:10.1021/cr040199o

Cited by 530 publications

(331 citation statements)

References 294 publications

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“…Phase equilibrium is fundamental to all of these applications. For instance, with gas-liquid biphasic reaction mixtures, which includes gas-expanded liquids, 7,8 phase equilibria play a key role in the understanding and determination of reaction kinetics. The equilibrium solubilities ͑chemical potentials͒ provide the driving force for interphase mass transfer.…”

Section: Introductionmentioning

confidence: 99%

High-pressure phase equilibria with compressed gases

Wei

Scurto

2007

Review of Scientific Instruments

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An apparatus is described that is capable of determining high-pressure vapor-liquid equilibrium, liquid-liquid equilibrium, solid-liquid-vapor equilibrium, vapor-liquid-liquid equilibrium, and mixture critical points and transitions. The device is capable of temperatures to 150°C and pressures to 300bars (higher with slight modifications). The construction and operation are described in detail and do not require the use of mercury. This method requires very low sample volumes and no analytical equipment nor system-specific calibration. The apparatus was verified by comparison with literature data for the decane-CO2 mixture and CO2-ionic liquid [1-hexyl-3-methyl-imidazolium bis(trifyl)imide)] systems. The experimental data have excellent agreement with the literature data that used different experimental methods. A rigorous error analysis of the system is also presented.

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Section: Introductionmentioning

confidence: 99%

High-pressure phase equilibria with compressed gases

Wei

Scurto

2007

Review of Scientific Instruments

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“…The swelling of the liquid phase of a molecular liquid upon injection of a gas under pressure is a thermodynamic observable of importance in chemical engineering studies. [112][113][114][115][116] To quantify the liquid phase swelling, we have calculated the evolution of the relative volume expansion V/V of the liquid phase of CS 2 with the CO 2 concentration from the molar volumes v m and v CS 2 of the mixture and pure CS 2 , respectively. 116 The evolution of V/V of the mixture closely follows the calculated V/V = x CO 2 v CO 2 / (x CS 2 v CS 2 ) which is valid for an ideal mixture for which the volume additivity applies (see Fig.…”

Section: Discussion On the Non-ideal Behaviour Of The Mixturementioning

confidence: 99%

Assessing the non-ideality of the CO2-CS2 system at molecular level: A Raman scattering study

Besnard

Cabaço²,

Coutinho

et al. 2013

The Journal of Chemical Physics

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The dense phase of CO 2 -CS 2 mixtures has been analysed by Raman spectroscopy as a function of the CO 2 concentration (0.02-0.95 mole fractions) by varying the pressure (0.5 MPa up to 7.7 MPa) at constant temperature (313 K). The polarised and depolarised spectra of the induced (ν 2 , ν 3 ) modes of CS 2 and of the ν 1 -2ν 2 Fermi resonance dyad of both CO 2 and CS 2 have been measured. Upon dilution with CO 2 , the evolution of the spectroscopic observables of all these modes displays a "plateau-like" region in the CO 2 mole fraction 0.3-0.7 never previously observed in CO 2 -organic liquids mixtures. The bandshape and intensity of the induced modes of CS 2 are similar to those of pure CS 2 up to equimolar concentration, after which variations occur. The preservation of the local ordering from pure CS 2 to equimolar concentration together with the non-linear evolution of the spectroscopic observables allows inferring that two solvation regimes exist with a transition occurring in the plateau domain. In the first regime, corresponding to CS 2 concentrated mixtures, the liquid phase is segregated with dominant CS 2 clusters, whereas, in the second one, CO 2 monomers and dimers and CO 2 -CS 2 hetero-dimers coexist dynamically on a picosecond time-scale. It is demonstrated that the subtle interplay between attractive and repulsive interactions which provides a molecular interpretation of the non-ideality of the CO 2 -CS 2 mixture allows rationalizing the volume expansion and the existence of the plateau-like region observed in the pressure-composition diagram previously ascribed to the proximity of an upper critical solution temperature at lower temperatures.

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“…[1][2][3][4]. As a stable hydrophobic ILs anion, bis(trifluoromethylsulfonyl)imide [NTf 2 ] À type ILs is especially strikingly [5][6][7].…”

Section: Introductionmentioning

confidence: 99%