Thermal expansion and pressure dependence of the critical temperature near the lower-critical solution point of 2-butoxyethanol+water

Compostizo, A.; Colín, A. Crespo; Vigil, M. R.; Rubio, Ramón G.; Peña, M. Díaz

doi:10.1016/0301-0104(92)87082-k

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…The functions for the NaCl‐H 2 O were calculated using correlations for the state‐space and densities [ Palliser and McKibbin , 1998a, 1998b]. Equivalent functions for the H 2 O‐BE system were constructed using data reported in several studies [ Pegg and Mclure , 1984; Compostizo et al , 1992; Braun et al , 1993; Back et al , 1998].…”

Section: Methodsmentioning

confidence: 99%

An experimental analogue for convection and phase separation in hydrothermal systems

Emmanuel

Berkowitz

2006

J. Geophys. Res.

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[1] Experiments were conducted to explore the behavior of convection and heat transfer during phase separation in porous media. Phase separation is considered to be an important process in many mid-ocean ridge hydrothermal systems in which a dense brine separates from a lighter, less saline vapor phase at supercritical temperatures. As this process occurs at high temperatures and pressures in seawater systems, a binary fluid (H 2 O-2-butoxyethanol) with a lower consolute point of 48.5°C, was used as a proxy for the hydrothermal fluid. In the experiments, a cell containing glass beads saturated with the binary fluid was heated from below and cooled from above. It was demonstrated that chemically differentiated regions can exist as part of a steady state convective regime, with the denser fluid phase separating and accumulating in a stagnant bottom layer. Furthermore, in upwelling regions phase separating fluids can become entrained. Phase separation was also found to lower the efficiency of convective thermal transfer, indicated by the deviation from the calculated single-phase Rayleigh-Nusselt curve. It is proposed that the reduction of convective heat transfer at supercritical conditions may be a crucial factor in controlling heat transfer through the oceanic crust.

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Section: Methodsmentioning

confidence: 99%

An experimental analogue for convection and phase separation in hydrothermal systems

Emmanuel

Berkowitz

2006

J. Geophys. Res.

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“….) because of the variability in the numbers of nonassociating hydrophobic (C i ) and hydrogen bond forming hydrophilic (E j ) groups of the C i E j molecules [98][99][100][101][102][103][104][105][106][107][108][109][110][111][112][113][114]. This variability allows for systematic investigations of homologous surfactant series and for solutions with a broad variety of critical micelle concentrations (cmcs).…”

Section: Micelle Formationmentioning

confidence: 99%

Sound attenuation near the demixing point of binary liquids: interplay of critical dynamics and noncritical kinetics

Bhattacharjee¹,

Kaatze²,

Mirzaev³

2010

Rep. Prog. Phys.

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The nature and origin of sound attenuation due to critical fluctuations near the liquid consolute point are discussed. Starting from basic principles, the background of critical phenomena is reviewed and the conceptions of theoretical approaches to describe the critical contributions to the propagation of sound are analysed. Experimental broadband spectra of suitable binary systems are evaluated jointly with results from quasi-elastic light scattering, shear viscosity and heat capacity measurements to verify or disprove theoretical predictions. It is shown that spectra of systems without or with only small-amplitude ultrasonic contribution from noncritical relaxation processes can be represented by theory with the asymptotic high-frequency sonic attenuation coefficient as a simple adjustable parameter. As a result, sonic spectra of more complex systems, exhibiting significant contributions from noncritical ultrasonic relaxations, are discussed assuming the critical part to be known from theory and auxiliary data. This modus operandi allows for a clear extraction of parameters relevant to the noncritical elementary processes in liquid mixtures, such as conformational changes, protolysis and hydrolysis reactions, monomer exchange from micelles and rotational isomerizations of membrane molecules. The influence of the critical dynamics on the noncritical kinetics is disclosed for some topical examples. Adiabatic couplingconstant 25 4. Mixtures featuring noncritical relaxation phenomena 26 4.1. Elementary reactions 26 4.2. Micelle formation 29 4.3. Membrane domain structure fluctuations and axial diffusion 31 5. Conclusions and perspectives 33 Acknowledgments 34 References 34

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“…To this end, we conjecture that inside the precursor film, the reduced pressure p f lowers the thermodynamical demixing boundary of the binary mixture, and therefore promotes phase separation. Literature data for mixtures of water and 2butoxyethanol shows that the LCST decreases with pressure [47,48].…”

mentioning

confidence: 99%

How liquid-liquid phase separation induces active spreading

Chao¹,

Ramìrez-Soto²,

Bahr³

et al. 2022

Preprint

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Thermal expansion and pressure dependence of the critical temperature near the lower-critical solution point of 2-butoxyethanol+water

Cited by 9 publications

References 22 publications

An experimental analogue for convection and phase separation in hydrothermal systems

An experimental analogue for convection and phase separation in hydrothermal systems

Sound attenuation near the demixing point of binary liquids: interplay of critical dynamics and noncritical kinetics

How liquid-liquid phase separation induces active spreading

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