Classical, non-classical critical divergences and partial molar properties from adsorption measurements in near-critical mixtures

Chimowitz, Eldred H.; Afrane, George

doi:10.1016/0378-3812(95)02858-7

Cited by 19 publications

(23 citation statements)

References 44 publications

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“…82 3.143 --605. 90 3.068 -- Table 2 shows the values of the phase boundary properties (T S , ρ S , ρ S , C V 1 , C V 2 , C V 1 , C V 2 ) derived with the quasi-static thermogram technique. In Figs.…”

Section: Resultsmentioning

confidence: 99%

“…where T C1 = 647.096 K, P C1 = 22.064 MPa (pure water, IAPWS [70] accepted values), T C2 = 405.4 K, and P C1 = 11.333 MPa (pure ammonia [76,77] and Tillner-Roth [28], (-·-·-·-) crossover model (Kiselev and Rainwater [29]); •-this study, •-Suzuki and Uematsu [42] − 2J /ρ 2 C1 [ρ(l) − ρ C1 ], is also directly related to the Krichevskii function, J = (∂ P/∂ x) ∞ T V , [78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95]. The limiting slope of RT ln K D as a function of the liquidphase density [ρ(l) − ρ C1 ], as the system approaches the critical point, is also given by the Krichevskii parameter as −2 (∂ P/∂ x) ∞ T C V C /ρ 2 C1 , Henry's constant K H near the critical point [95,96], (T ln (K H / f 1 ), and T ln E (where E = y 2 P/P sub 2 is the enhancement factor; P, y 2 , P sub 2 are the pressure, solubility, and sublimation pressure, respectively) are linear in the solvent density, with the slope given by the Krichevskii parameter.…”

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: Resultsmentioning

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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“…(10) and (11) were occasionally employed to obtain h ∞ 1,m orh ∞ 1m −h ∞ 1s , mostly for aromatic hydrocarbon solutes [21,22,58,72,73] and hexasubstituted benzenes [110] in scCO 2 with the use of both packed [21,22,58,110] and open tubular [72,73] columns. A related approach using solute adsorption was also used to obtain infinite-dilution partial molar enthalpies of aromatic hydrocarbons in scCO 2 -ethane mixtures [85].…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…Akman et al [82] presented a thermodynamic model for adsorption SFC, and adsorption SFC with silica gel adsorbents was employed to determinev ∞ 1m for several aromatic solutes in scCO 2 [83,84] as well as in CO 2 -ethane mixtures [85].…”

Section: Effect Of Pressurementioning

confidence: 99%

Determination of thermodynamic properties by supercritical fluid chromatography

Roth

2004

Journal of Chromatography A

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“…As well-known the thermodynamic behavior of mixtures in the vicinity critical point of one of the components has considerable practical and theoretical importance [2][3][4][5][6][7][8][9][10][11]. In the infinite-dilution limit many thermodynamic properties show universal behavior.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the one-, two-, and three-phase isochoric heat capacities of n-hexane+water mixtures near the lower critical line. Part II. Krichevskii parameter and thermodynamic and structural properties

Bezgomonova

Abdulagatov

Степанов

2012

Journal of Molecular Liquids

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Classical, non-classical critical divergences and partial molar properties from adsorption measurements in near-critical mixtures

Cited by 19 publications

References 44 publications

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

Determination of thermodynamic properties by supercritical fluid chromatography

Experimental study of the one-, two-, and three-phase isochoric heat capacities of n-hexane+water mixtures near the lower critical line. Part II. Krichevskii parameter and thermodynamic and structural properties

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