Hydrogen vapor pressures from 4 to 30 K: a review. [67 references]

Souers, P. C.; Briggs, C.K.; Pyper, J.W.; Tsugawa, R.T.

doi:10.2172/7110677

Cited by 7 publications

(9 citation statements)

References 1 publication

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“…Despite the lack of evidence for two solid structures in n-D 21 we did consider this possibility in connection with our observed melting pressure changes. If the Gibbs-energy functions of two solid phases are approximately equal.…”

Section: Further Observationsmentioning

confidence: 79%

“…A detailed comparison of this result to existing data is given elsewhere [33]. Data for the isothermal compressibility and thermal expansivity of the liquid were collected in the temperature range IS.S to 21.0 K and at pressures between 4 and 70 bar. We compared these with estimates of corresponding values derived from existing molar volume data [2.5.6].…”

Section: Discussionmentioning

confidence: 99%

“…Again, there is probably little if any difference between the molecular polarizabilities of the solid and liquid phases at 21.1 K on the melting line. Once more, our justification derives from independent work on p-H2.…”

Section: Cp(tp)mentioning

confidence: 99%

“…The melting pressure at 21.1 K is only 99.4 bar according to eq (3). There should be no significant change in the liquid polarizability at this temperature over the limited pressure interval between the vapor and melting curves.…”

Section: Cp(tp)mentioning

confidence: 99%

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Pressure-Volume-Temperature Relationships for Normal Deuterium Between 18.7 and 21.0 K

Schwalbe¹,

Grilly²

1984

J. RES. NATL. BUR. STAN.

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Analytical expressions are derived for the melting line and liquid equation of state of normal deuterium near the triple point. Melting pressures were measured between the triple point and 20.4 K. These results combined with existing pressure measurements along the saturated liquid-vapor curve fix an accurate value. Ttp =j118. 723 K, for the triple-point temperature. Data for the isothermal compressibility and thermal expansion coefficients of the liquid were taken over the temperature and pressure ranges 18.8 to 21.0 K and 4 to 70 bar, respectively. The liquid molar volume was measured at nine points below 20.4 K. All liquid PVT data are shown to be internally consistent. Measurements of the volume changes on melting are also presented. The heat of fusion and the solid molar volume at melting are deduced from these data. Also included are detailed comparisons of our results with existing data. A critical appraisal is given of all measured thermodynamic quantities in this regime.

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Section: Further Observationsmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Cp(tp)mentioning

confidence: 99%

Section: Cp(tp)mentioning

confidence: 99%

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Pressure-Volume-Temperature Relationships for Normal Deuterium Between 18.7 and 21.0 K

Schwalbe¹,

Grilly²

1984

J. RES. NATL. BUR. STAN.

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“…Имеются также данные по в работе [9]. Для расчета предложены и другие уравнения [14,16]. В данной работе принято уравнение Грилли.…”

Section: Introductionunclassified

Parameters of the UNIQUAC model for describing the vapor-liquid phase equilibrium of D2-T2, D2-DT, DT-T2 hydrogen isotope mixtures

Korotkova

2023

Fine Chem. Technol.

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Objectives. Determination of the parameters of the binary energy interaction of the (UNIversal QUAsiChemical) UNIQUAC model on the basis of mathematical processing of experimental literature data on the phase equilibrium of hydrogen isotopic mixtures D2-T2, D2-DT, DT-T2 to calculate the activity coefficients of the components D2, DT, and T2.Methods. The method of successive approximations was used in junction with the “from stage to stage” method, which consists in calculating a single evaporation process on a theoretical plate.Results. Equations were written for calculating the activity coefficients of hydrogen isotopes on the basis of the Sherwood theory as applied to binary D2-T2, D2-DT, DT-T2 and ternary D2-DT-T2 hydrogen isotope mixtures. The graphical dependences of the activity coefficients and separation coefficients of mixtures D2-T2, D2-DT, and DT-T2 are compared in the range of the concentration of a highly volatile component from 0 to 100 mol % at atmospheric pressure for three options: ideal mixtures; non-ideal mixtures using the Sherwood theory; non-ideal mixtures on the basis of the UNIQUAC model. The dependences of the separation coefficients a were found to be similar for all binary isotopic mixtures. However, when considering mixtures as ideal, a increases.According to Sherwood's theory, a remains a practically constant value, which is independent of the composition of the mixture. The UNIQUAC model predicts a decrease in a with an increase in the concentration of a less volatile component in the mixture. The profile of the distribution of hydrogen isotopes D2, DT, and T2 of a three-component mixture D2-DT-T2, along the height of a distillation column operating in a closed mode was calculated for three variants. It was accepted that: pressure along the height of the column is constant and equal to atmospheric 760 mm Hg. Art.; number of theoretical plates 21; concentration of components in the liquid phase on the first plate (stage), in mol %: XD₂ = 65; XDT= 10; XT₂= 25; the accuracy of calculating the composition of the vapor phase is 10-10.Conclusions. The parameters of the binary energy interaction of the UNIQUAC model of hydrogen isotopic mixtures D2-T2, D2-DT, and DT-T2 are determined. The UNIQUAC model is adequate in relation to experimental data on the coefficient of separation. Due to systematic deviations in the theoretical Sherwood and ideal models, they are not suitable for further calculations of phase equilibrium of isotopic mixtures of hydrogen D2-T2, D2-DT, DT-T2, and D2-DT-T2.

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Diamagnetic antimatter storage

Semyonov

2017

Acta Astronautica

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Hydrogen vapor pressures from 4 to 30 K: a review. [67 references]

Abstract: Introduction The Clausius-Clapeyron Equation The Saturated Liquid-Gas Vapor Pressure Virial Coefficients

Cited by 7 publications

References 1 publication

Pressure-Volume-Temperature Relationships for Normal Deuterium Between 18.7 and 21.0 K

Pressure-Volume-Temperature Relationships for Normal Deuterium Between 18.7 and 21.0 K

Parameters of the UNIQUAC model for describing the vapor-liquid phase equilibrium of D<sub>2</sub>-T<sub>2</sub>, D<sub>2</sub>-DT, DT-T<sub>2</sub> hydrogen isotope mixtures

Diamagnetic antimatter storage

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