ABSTRACT

A variable volume apparatus of low cell volume (approximately 10 cm3) was designed and commissioned for measuring phase equilibrium and thermodynamic property data. The experimental procedure and equipment capability for phase equilibrium measurements were validated by measuring isothermal phase equilibrium (T-P-x) data for binary mixtures involving carbon dioxide + n-hexane and ethane + n-octane. There is good agreement between data measurement using the new equilibrium cell and previous measurements reported in the literature. New T-P-x data were also measured for the binary mixture of ethane + 2,2,4-trimethylpentane. The data were correlating using the Peng-Robinson Equation of State and the van der Waals mixing rule. The expanded uncertainties in the measurements were evaluated as 0.07 K, 0.01 MPa, and 0.008 for the temperature, pressure, and liquid mole fraction, respectively.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	C2H6	ethane
3	C6H14	hexane
4	C8H18	2,2,4-trimethylpentane
5	C8H18	octane

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	Constraint	Phase	Method	#Points
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Closed cell (Static) method	1
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Closed cell (Static) method	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	4	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	5	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	2 5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid		Liquid Gas	Closed cell (Static) method	11
POMD	1 3	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	9
POMD	2 4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid		Liquid Gas	Closed cell (Static) method	44

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Experimental Solubility Data for Binary Mixtures of Ethane and 2,2,4-Trimethylpentane at Pressures up to 6 MPa Using a New Variable-Volume Sapphire Cell

Nelson, Wayne Michael, Ramjugernath, Deresh

ABSTRACT