IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ethene with Heptane, 1,1,1,7-Tetrachloro-

Components:
   (1) Heptane, 1,1,1,7-Tetrachloro-; C7H12Cl4; [3922-36-9]  NIST Chemistry WebBook for detail
   (2) Ethene; C2H4; [74-85-1]  NIST Chemistry WebBook for detail

Original Measurements:
   Efremova, G.D.; Kovpakova, P.F., Zhur. Fiz, Khim. 1958, 32, 1231-1240.

Variables:
   Temperature = 273.35 K to 373.15 K
   Pressure = 1.013 to 10.13 MPa

Prepared By:
   W. Hayduk

Experimental Remarks:

   Phase equilibrium compositions of ethene in liquid solutions are graphically shown as a function of pressure over the complete ethene composition range to 99 mole percent ethene. Critical phenomena are reported for high concentrations of ethene at high pressures.

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)


t/°C	T/K	Pressure [kPa]	Henry's law constant, K [Atm (mole fraction)^–1]	Henry Constant Note	Mole Fraction (x₁)	x₁ Note
0.2	273.35	101.3	70	1	0.0143	1
25	298.15	101.3	93	1	0.0108	1
50	323.15	101.3	117	1	0.0085	1
75	348.15	101.3	139	1	0.0072	1
100	373.15	101.3	164	1	0.0061	1

Notes:
¹ Henry's law constants and mole fraction solubility's at 101.3 kPa were evaluated by the compiler form enlarged graphs only; there were no numerical solubility data. Henry's law was Observed to fit the data closely up to about 0.40 mole fraction ethene for all temperatures.

Method/Apparatus/Procedure:
The apparatus and procedure are described in Ref. 1. The equilibration device is a capillary tube 1 mm in diameter containing an internal mixer which is moved up and down by means of an external, motor driven magnet. The capillary tube is sealed in a vertical position and connected to a gas and liquid charging system, pressure gauges, as well as a volume regulator to maintain a constant pressure and to determine the volume of gas charged.

Graphs of liquid solution molar volumes are also given as a function of solution compositions, including those for critical values at high pressures.

Source and Purity of Materials:
   1. Ethene purity 97.5% by analysis.
   2. Tetrachloro-propane vacuum distilled. Actual purity not given. Density and refractive index at 20 °C:
ρ = 1.2509 g cm^–3,
n_D = 1.4843

Estimated Errors:
   Solubility: δ x₁/x₁ = ± 4% (compiler)

References:
   1. Kritchevskii, I.R.; Efremova, G.D., Zhur. Fiz. Chim. 1956, 30, 1877.