Phase Equilibria Between Immiscible Gaseous Phases

Tsiklis, Daniil S.; Rott, L. A.

doi:10.1070/rc1967v036n05abeh001629

Cited by 30 publications

(18 citation statements)

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“…Most critical parameters of the mixture were determined from phase equilibrium measurements [46,48,49,51], high-pressure optical phase equilibrium cell [47], and from PVTx measurements using a metal-bellows variable volumeter with an optical cell [50]. The agreement between different sources is good (see Sect.…”

Section: Critical Parametersmentioning

confidence: 99%

“…Previously, the critical properties of NH 3 + H 2 O solutions were measured by several authors [46][47][48][49][50][51]. Most critical parameters of the mixture were determined from phase equilibrium measurements [46,48,49,51], high-pressure optical phase equilibrium cell [47], and from PVTx measurements using a metal-bellows variable volumeter with an optical cell [50].…”

Section: Critical Parametersmentioning

confidence: 99%

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Experimental Study of the Critical Behavior of the Isochoric Heat Capacity of Aqueous Ammonia Mixture

et al. 2009

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The isochoric heat capacity of a NH 3 + H 2 O (0.2607 mole fraction of ammonia) mixture has been measured in the near-and supercritical regions. Measurements were made in the single-and two-phase regions including the coexistence curve using a high-temperature, high-pressure, nearly constant-volume adiabatic calorimeter. Measurements were made along 38 liquid and vapor isochores in the range from 120.03 kg · m −3 to 671.23 kg · m −3 and at temperatures from 478 K to 634 K and at pressures up to 28 MPa. Temperatures at the liquid-gas phase transition curve, T S (ρ), for each measured density (isochore) and the critical parameters (T C and ρ C ) for the 0.2607 NH 3 + 0.7393 H 2 O mixture were obtained using the quasi-static thermograms technique. The expanded uncertainty of the heat-capacity measurements at the 95 % confidence level with a coverage factor of k = 2 is estimated to be 2 % to 3 % in the near-critical and supercritical regions, 1.0 % to 1.5 % in the liquid phase, and 3 % to 4 % in the vapor phase. Uncertainties of the density, temperature, and concentration measurements are estimated to be 0.06 %, 15 mK, and 5×10 −5 mole fraction, respectively. An unusual behavior of the isochoric heat capacity of the mixture was found near the maxcondetherm point (in the retrograde region). The value of the Krichevskii parameter was calculated using the critical properties data for the mixture and vapor-pressure 123 738 Int J Thermophys (2009) 30:737-781 data for the pure solvent (H 2 O). The derived value of the Krichevskii parameter was used to analyze the critical behavior of the strong (C P , K T ) and weakly (C V ) singular properties in terms of the principle of isomorphism of critical phenomena in binary mixtures. The values of the characteristic parameters (K 1 , K 2 ), temperatures (τ 1 , τ 2 ), and the characteristic density differences ( ρ 1 , ρ 2 ) were calculated for the NH 3 + H 2 O mixture by using the critical-curve data.

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Section: Critical Parametersmentioning

confidence: 99%

Section: Critical Parametersmentioning

confidence: 99%

Experimental Study of the Critical Behavior of the Isochoric Heat Capacity of Aqueous Ammonia Mixture

et al. 2009

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“…The positive starting slope of the critical line in the (p, T) representation indicates that (helium+mercury) belongs to the group of binary mixtures that exhibit (fluid+fluid) phase equilibrium of the first type. Helium mixtures containing ammonia, methanol, sulfur and carbon dioxide, dinitrogen monoxide, many hydrocarbons and fluorocarbons, (3) water, (30) and even xenon, (27) present (fluid+fluid) in-miscibility of the first type. On the other hand, mixtures of He and H 2 , (31)(32)(33)) N 2 (26,34) and Ar, (25,26) present supercritical phase equilibria of the second type.…”

Section: Discussionmentioning

confidence: 99%

“…The understanding of these phenomena was predicted by van der Waals about the beginning of this century from fold theory (2) and has been the subject of numerous experimental and theoretical studies. (3)(4)(5)(6)(7) However, most of the phase diagrams obtained experimentally have been limited to simple mixtures of relatively similar components such as two molecular fluids, at temperatures below 1000 K, due mainly to technological limitations. Attempts to determine the characteristics of phase diagrams for binary mixtures of components of different types such as metallic and molecular fluids have received less attention.…”

Section: Introductionmentioning

confidence: 99%

Fluid phase equilibrium of dilute mixtures of helium in near-critical mercury

Marceca

Schäfer

Hensel

1996

The Journal of Chemical Thermodynamics

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“…ERR and bRR are the Lennard-Jones parameters of this reference substance. ( E ) and (a) are averaged values of these parameters for the mixture and can be obtained from (a) = (yI6 with d = x~~E~~~~ + ~x~x~E~~~ + x 2 2~2 2 a 2 2 12 For the calculation of the critical curve, AG is evaluated as a function of xi for different temperatures at a given pressure p. When phase separation occurs these isobaric-isothermal AG(x,)-curves are double s-shaped and the common tangent determines the mole fractions xi' and xl" of the coexisting phases. The isotherm where xl' = xl" = xlc corresponds to the critical temperature T, at the given pressure.…”

Section: Corresponding States Treatmentmentioning

confidence: 99%

Phase Equilibria in Fluid Mixtures at High Pressures

Schneider¹

1970

Advances in Chemical Physics

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The six types of phase behaviour observed in binary mixtures are described briefly. Liquid-liquid immiscibility in Type II and Type III phase behaviour is discussed in terms of pressure-temperaturecomposition diagrams. The conditions for the coexistence of two phases and the conditions for a critical point in both binary and ternary mixtures are presented. The criticality conditions are given in terms of both the Gibbs and Helmholtz functions. Methods for calculating high pressure equilibrium in fluid mixtures using these conditions together with a one fluid model are discussed. The use of empirical and theoretically based equations of state to calculate the Helmholtz function are briefly reviewed and the need for caution when using this approach is pointed out. Finally the need for a classification for the phase behaviour of ternary mixtures and for liquid-liquid equilibrium data of higher accuracy are considered.

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Phase Equilibria Between Immiscible Gaseous Phases

Cited by 30 publications

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Experimental Study of the Critical Behavior of the Isochoric Heat Capacity of Aqueous Ammonia Mixture

Experimental Study of the Critical Behavior of the Isochoric Heat Capacity of Aqueous Ammonia Mixture

Fluid phase equilibrium of dilute mixtures of helium in near-critical mercury

Phase Equilibria in Fluid Mixtures at High Pressures

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