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

Content Provider	Springer Nature Link
Author	Polikhronidi, N. G. Abdulagatov, I. M. Batyrova, R. G. Stepav, G. V.
Copyright Year	2009
Abstract	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 %, 15mK, 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 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 (Δρ $_{1}$, Δρ $_{2}$) were calculated for the NH$_{3}$ + H$_{2}$O mixture by using the critical-curve data.
Starting Page	737
Ending Page	781
Page Count	45
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	30
Issue Number	3
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2009-06-04
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ammonia Binary mixture Coexistence curve Critical parameters Critical point Equation of state Isochoric heat capacity Krichevskii parameter Maxcondetherm Quasi-static thermograms Retrograde phenomena Water Physical Chemistry Mechanics Condensed Matter Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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