Liquid-Vapor Equilibria of the Neon-Helium System

Heck, C. K.; Barrick, P. L.

doi:10.1007/978-1-4757-0489-1_75

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…An example is the bubble point compositions at 26.95 K and 27.03 K, reported by Ref. 52 and Ref. 51 respectively; although the measurements are at essentially the same temperature, they exhibit large and systematic deviations.…”

Section: Resultsmentioning

confidence: 93%

“…48-50. Two publications report measurements on the heliumneon system: Knorn (1967), 51 and Heck and Barrick (1967), 52 who both measured only phase equilibrium compositions. Unfortunately, the bubble point (i.e.…”

Section: Resultsmentioning

confidence: 99%

“…1e and 1f). Crosses are experimental measurements, 51,52 circles are simulation results, and lines are calculations with SAFT-VRQ Mie (Figs. 1a-1d) or SRK (Figs.…”

Section: Figmentioning

confidence: 99%

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Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Aasen

Hammer

Müller

et al. 2020

The Journal of Chemical Physics

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We extend the SAFT-VRQ Mie equation of state, previously developed for pure fluids [Aasen et al., J. Chem. Phys. 151, 064508 (2019)], to fluid mixtures of particles interacting via Mie potentials with Feynman-Hibbs quantum corrections of first (Mie-FH1) or second order (Mie-FH2). This is done using a third-order Barker-Henderson expansion of the Helmholtz energy from a non-additive hard-sphere reference system. We survey existing experimental measurements and ab initio calculations of thermodynamic properties of mixtures of neon, helium, deuterium and hydrogen, and use them to optimize the Mie-FH1 and Mie-FH2 force fields for binary interactions. Simulations employing the optimized force fields are shown to follow the experimental results closely over the entire phase envelopes. SAFT-VRQ Mie reproduces results from simulations employing these force fields, with the exception of near-critical states for mixtures containing helium. This breakdown is explained in terms of the extremely low dispersive energy of helium, and the challenges inherent in current implementations of the Barker-Henderson expansion for mixtures. The interaction parameters of two cubic equations of state (SRK, PR) are also fitted to experiments, and used as performance benchmarks. There are large gaps in the ranges and properties that have been experimentally measured for these systems, making the force fields presented especially useful.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Aasen

Hammer

Müller

et al. 2020

The Journal of Chemical Physics

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“…4.3. [37] and Knorn [38] measured in 1967 phase-equilibrium compositions of the helium-neon mixture at various conditions. We used these experimental data to find the interaction coefficient, k i j , of the cubic Peng Robison EoS by minimizing the mean square deviation with respect to the experimental data.…”

Section: Resultsmentioning

confidence: 99%

Reducing the exergy destruction in the cryogenic heat exchangers of hydrogen liquefaction processes

Wilhelmsen

Berstad

Aasen

et al. 2018

International Journal of Hydrogen Energy

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A present key barrier for implementing large-scale hydrogen liquefaction plants is their high power consumption. The cryogenic heat exchangers are responsible for a significant part of the exergy destruction in these plants and we evaluate in this work strategies to increase their efficiency. A detailed model of a plate-fin heat exchanger is presented that incorporates the geometry of the heat exchanger, nonequilibrium ortho-para conversion and correlations to account for the pressure drop and heat transfer coefficients due to possible boiling/condensation of the refrigerant at the lowest temperatures. Based on available experimental data, a correlation for the ortho-para conversion kinetics is developed, which reproduces available experimental data with an average deviation of 2.2%. In a plate-fin heat exchanger that is used to cool the hydrogen from 47.8 K to 29.3 K with hydrogen as refrigerant, we find that the two main sources of exergy destruction are thermal gradients and ortho-para hydrogen conversion, being responsible for 69% and 29% of the exergy destruction respectively. A route to reduce the exergy destruction from the ortho-para hydrogen conversion is to use a more efficient catalyst, where we find that a doubling of the catalytic activity in comparison to ferric-oxide, as demonstrated by nickel oxide-silica catalyst, reduces the exergy destruction by 9%. A possible route to reduce the exergy destruction from thermal gradients is to employ an evaporating mixture of helium and neon at the cold-side of the heat exchanger, which reduces the exergy destruction by 7%. We find that a combination of hydrogen and helium-neon as refrigerants at high and low temperatures respectively, enables a reduction of the exergy destruction by 35%. A combination of both improved catalyst and the use of hydrogen and helium-neon as refrigerants gives the possibility to reduce the exergy destruction in the cryogenic heat exchangers by 43%. The limited efficiency of the ortho-para catalyst represents a barrier for further improvement of the efficiency.

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“…Systems with helium involve an additional interesting aspect in that deviations from the commonly used mixing rules become quite large. The helium-neon system has been studied in the liquid-vapor region (Heck and Barrick, 1967; Knorn, 1967) while helium-argon has been investigated both above and below the argon triple point (Mullins and Ziegler, 1965). One isotherm in the solid-vapor range has also been reported for helium-xenon (Ewald, 1955).…”

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confidence: 99%

Solid-Vapor and Liquid-Vapor Phase Equilibria for the Helium-Krypton System

Kidnay¹,

Miller²,

Hiza³

1971

Ind. Eng. Chem. Fund.

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A vapor-recirculation equilibrium cell was used to investigate both the solid-vapor and liquid-vapor equilibria and the three-phase curve for the system helium-krypton. Gas-phase compositions were measured above solid krypton at 100.00, 105.00, 110.00, and 115.00 K and at pressures to 1 20 atm (1 2.1 6 MN/m2).Both gas and liquid compositions were determined at 117.09, 120.85, 129.60, 139.56, and 150.00 K for the same range of pressures. Analysis of the gas-phase data by both the virial and modified Redlich-Kwong equations indicates that a deviation parameter of about 0.3 is necessary for the geometric-mean mixing rule for energy parameters. Comparison of the Henry's law constants for the liquid phase with the statistical model of Miller and Prausnitz indicates a somewhat larger deviation parameter.

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Liquid-Vapor Equilibria of the Neon-Helium System

Cited by 10 publications

References 10 publications

Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Reducing the exergy destruction in the cryogenic heat exchangers of hydrogen liquefaction processes

Solid-Vapor and Liquid-Vapor Phase Equilibria for the Helium-Krypton System

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