(p, ρ, T) measurements of (ammonia+ water) in the temperature range 310 K to 400 K at pressures up to 17 MPa. II. Measurements of{ xNH3+ (1 −x )H2O } at x=(1.0000, 0.8374, 0.6005, and 0.2973)

The (p,ρ,T,x) properties for {xNH3+(1−x)H2O} at T=(450 and 500)K over the pressure range from (10 to 200)MPa

“…In previous publications [1][2][3][4][5], we reported measurements of (p, q, T, x), bubble point pressure, saturated liquid density, isobaric specific heat capacity, and the critical parameter for {xNH 3 + (1 À x)H 2 O} with x = (0.1016 to 1.0000) by a metal-bellows variable volumometer in the compressed liquid phase at T = (280 to 405) K at pressures up to p = 17 MPa. In continuation of our work, the results of the (p, q, T, x) property measurements for {xNH 3 + (1 À x)H 2 O} with x = (0.1048 to 1.0000) in the higher temperature and pressure regions at T = (450, 500) K, and at p = (10 to 200) MPa are presented in this paper.…”

A Helmholtz free energy equation of state for the NH3–H2O fluid mixture: Correlation of the PVTx and vapor–liquid phase equilibrium properties

“…This EOS can calculate various thermodynamic properties of NH 3 -H 2 O fluid mixture of all compositions up to 623 K and 400 bar with or close to experimental accuracy. However, since 1995 more experimental PVTx data covering a larger temperature-pressure-composition (P-T-x) range have been published [28][29][30][31][32][33][34][35][36][37], and molar volumes calculated from the EOS of Tillner-Roth and Friend [17] deviate from the experimental data in some P-T-x regions, which leads to the motivation of this study.…”

“…All their data are not used in the parameterization. The PVTx data[28][29][30][31][32][33][34] after 1995 are reliable. Therefore, these reliable PVTx and VLE data[8,13,[28][29][30][31][32][33][34][39][40][41][42] but those[35][36][37] were used to optimize binary parameters of the EOS, where the highest temperature and pressure of data are 706 K and 2000 bar.…”

Critical parameters for ammonia

“…In previous publications [1][2][3][4] we reported measurements of thermodynamic properties of ammonia and its aqueous mixtures in the compressed liquid phase between the temperatures (310 and 400) K at pressures up to 200 MPa. In continuation of our work, the results of (p, q, T) measurements and visual observations of the meniscus for pure ammonia in the critical region are presented in this paper.…”