ABSTRACT

Measurements of the critical parameters for {xNH3 + (1 x)H2O} with x = (0.9098,0.7757,0.6808) were carried out by using a metal-bellows variable volumometer with an optical cell. The expanded uncertainties (k = 2) in temperature, pressure, density, and composition measurements have been estimated to be less than 3.2 mK, 3.2 kPa, 0.3 kg m 3, and 8.8 10 4, respectively. In each mole fraction, the critical temperature Tc was first determined on the basis of the intensity of the critical opalescence. The critical pressure pc and critical density qc were then determined as the point at which the meniscus disappears on the isotherm at T = Tc. The expanded uncertainties (k = 2) in the present critical parameters have also been estimated. Comparisons of the present values with the literature data as well as the calculated values afforded using the equation of state are also presented.

Compounds

#	Formula	Name
1	H3N	ammonia
2	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1 2	Critical pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	metal-bellows variable volumeter	3
POMD	1 2	Critical temperature, K ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	metal-bellows variable volumeter	3
POMD	1 2	Critical density, kg/m3 ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	bellows voluometer	3
POMD	1 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Bellows volumetry	15

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Measurements of the critical parameters for {xNH3 + (1 x)H2O} with x = (0.9098, 0.7757,0.6808)

Sakabe, A., Arai, D., Miyamoto, H., Uematsu, M.

ABSTRACT