Measurement of vapor–liquid–liquid phase equilibrium—Equipment and results

Frost, Michael Grynnerup; Solms, Nicolas von; Richon, Dominique; Kontogeorgis, Georgios M.

doi:10.1016/j.fluid.2015.07.009

Cited by 9 publications

(12 citation statements)

References 18 publications

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“…A series of binary and ternary VLE and VLLE measurements have been made using an analytical isothermal equilibrium cell. The apparatus was originally designed and commissioned by Frost et al [6,41] and following modifications, the apparatus was recommissioned. A new gas chromatograph (GC) has been installed, which meant that the analytical accuracy of the apparatus needed to be verified.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…The experimental apparatus is presented in Figure 1. The equilibrium cell (V = 60 cm 3 ) for the most part has remained unchanged from the original design of Frost et al [6,41], with only a minor modifications to resolve leaking issues and a larger motor for the magnetic stirrer. The screw mechanism for securing the sapphire windows to the cell has been replaced with a stainless steel cap and gasket, which is held in place by 10 small threaded screws.…”

Section: Experimental Methodologymentioning

confidence: 99%

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High-pressure experimental vapour-liquid-liquid equilibrium measurements and modelling for natural gas processing: Equipment validation, and the system CH4+nC6H14+H2O

Kruger

Varsos

Kontogeorgis

et al. 2019

Fluid Phase Equilibria

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Section: Experimental Methodologymentioning

confidence: 99%

Section: Experimental Methodologymentioning

confidence: 99%

High-pressure experimental vapour-liquid-liquid equilibrium measurements and modelling for natural gas processing: Equipment validation, and the system CH4+nC6H14+H2O

Kruger

Varsos

Kontogeorgis

et al. 2019

Fluid Phase Equilibria

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“…According to the phase rule, the degrees of freedom of the binary mixture refrigerant are 2, which means two physical quantities are known. According to equations of state (6), (8), and 9, any physical quantity can be calculated. But for the mixed refrigerants of ternary or more, further supplemental equations and boundary conditions are needed.…”

Section: The Pressure and Initial Ratio Of Mixed Refriger-mentioning

confidence: 99%

“…However, the thermal physical properties of refrigerant mixtures and the heat and mass transfer process running in the system are very complex, which involve the characteristics of flow, heat, and mass transfer of the multiple mixed refrigerants. The study on the thermodynamic properties of the mixed refrigerants in the ARC cycle is very limited, and recent literature mostly focuses on the near-azeotropic mixture refrigerant, [8][9][10][11][12][13] and there is no proven theoretical support for the vapor-liquid equilibrium of the zeotropic mixture refrigerant and the calculation of enthalpy and entropy. Therefore, we established mathematical model to calculate the thermodynamic properties of zeotropic mixtures of R600a/R23/R14.…”

Section: Introductionmentioning

confidence: 99%

The study of thermodynamic properties of zeotropic mixtures of R600a/R23/R14

Zhang

et al. 2017

Advances in Mechanical Engineering

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Thermodynamic properties of zeotropic mixtures of R600a/R23/R14 have been investigated and calculated based on the established mathematical model. The deviations of bubble pressure and vapor composition between the simulation results and the experimental data were 20.16% and 21.22% for R600a/R23 and 20.14% and 0.5% for R134a/R23, respectively. The simulation results of R32/R125/R134a were compared with the experimental values of the component, and the average error was 0.31%, and most deviations were within 6 5%. The average error in enthalpy value and entropy value between the simulation and National Institute of Standard Technology data was 20.25% and 3.33%, respectively. This suggests that the simulation results meet the requirements of engineering calculation. Based on the experimental results, the thermodynamic properties of the auto-cascade refrigeration system were calculated and analyzed in detail. The pressure-enthalpy diagrams of the auto-refrigerating cascade system with R600a/R23/R14 under the operating conditions were given, and the cycle of this system can be clearly described by the diagram of spatial pressure-enthalpy, which indicates that this simulation program could analyze the system cycle effectively and provide a direction for improvement of the auto-refrigerating cascade system.

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“…The oven ( 6) is suspended to the rack (1) with an axis (7) that allows rotation as displayed by the two blue arrows. The mechanism (11) is activated through a crank to rotate the oven and maintain it in the given position requested to have the extremity of the bent capillary of the pneumatic capillary sampler used for liquids samplings in the right phase. On Figure 7 we see that rotating the oven counter clockwise allows sampling liquid 1 (capillary extremity (1) is in the bottom of the cell, Figure 7a) while rotating the oven clockwise allows sampling liquid 2, (capillary extremity (1) is in the medium phase, see Figure 7b).…”

Section: Equipment and Materialsmentioning

confidence: 99%

Design of Equilibrium Cells for Phase Equilibria and PVT Measurements in Large Ranges of Temperatures and Pressures. I. Vapor–Liquid–Liquid Equilibria

et al. 2016

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Acquiring accurate experimental thermodynamic data is very useful for the development of models and chemical processes. Although there are plenty of data in the scientific literature, there are still many missing. In fact, many of the easier measurements have been made, and far more of the remaining ones deal with either complex systems or extreme conditions. Clearly new adequate equipment for acquiring such data are welcome. For these purposes, advice coming from several decades of equipment design experience are exposed herein. After defining the aim pursued and consequently the type of desired thermodynamic quantity, it is necessary to take into account all physical and chemical constraints: viscosity, density, corrosive power of studied chemical systems, temperature, pressure together with other important points such as miniaturization, efficient stirring, avoiding both dead volume and polymer sealing. The other aim of this paper is to present a high temperature and high pressure apparatus capable of measuring the phase equilibria of systems exhibiting vapor–liquid–liquid behavior. The apparatus designed and built consists mainly of an equilibrium cell (70 cm3), novel high temperature, and high pressure samplers and a gas chromatograph. A detailed description of the apparatus is presented. Preliminary measurements are presented for propane in water, cyclohexane in water, and water in cyclohexane up to 498.8 K. In addition the solubility of 2-methylfuran in water up to 413 K and 1548 kPa was measured.

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Measurement of vapor–liquid–liquid phase equilibrium—Equipment and results

Cited by 9 publications

References 18 publications

High-pressure experimental vapour-liquid-liquid equilibrium measurements and modelling for natural gas processing: Equipment validation, and the system CH4+nC6H14+H2O

High-pressure experimental vapour-liquid-liquid equilibrium measurements and modelling for natural gas processing: Equipment validation, and the system CH4+nC6H14+H2O

The study of thermodynamic properties of zeotropic mixtures of R600a/R23/R14

Design of Equilibrium Cells for Phase Equilibria and PVT Measurements in Large Ranges of Temperatures and Pressures. I. Vapor–Liquid–Liquid Equilibria

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