Compilation - Methylcyclohexane with Water (IUPAC SDS Volume 37)
SDS Volume (515)
Volume 37. Hydrocarbons in Water and Seawater, Part I, p 453
Original Measurements
Rudakov, E. S.; Lutsyk, A. I.; Zh. Fiz. Khim. 1979, 53, 1298-1300.
Variables:
Temperature: 25 °C
Prepared by:
Method/Apparatus/Procedure:
The equilibrium distribution was attained after shaking for 10 min the thermostatted reactor containging (2) and the (1) vapor. After being allowed to stand for 10 min, equal calibrated volumes of samples of the gas and solution were introduced by a syringe into a speccial cell for the removal of (1) by blowing, built into the gas line of the chromatograph and the partition coefficent alphs was determined as the ratio of the areas of the peaks of the substrate arising from the two phases.
Source and Purity of Materials:
- Not specified.
- not specified.
References
Methylcyclohexane with Water
Components:
(2) Water,
$\ce{ H2O }$;
[7732-18-5]
NIST WebBook
(1) Methylcyclohexane,
$\ce{ C7H14 }$;
[108-87-2]
NIST WebBook
Experimental Values:
The authors reported the partition coefficent a of methylcyclohexane between the gas and aqueous phase. a = 16 ± 1. a = Cg/Cs with Cs being the concentration of the compound in dilute aqueous solution at 25°C and Cg the concentration in the gas phase in equilibrium with the aqueous solution (both in moles per liter).
The compiler has assumed that when (1) and (2) are not very soluble in each other, Cs may be taken as the water solubility and Cg as the vapor pressure of (1). The value of p (where p is the vapor pressure in mm of Hg) is taken from ref 1. p = 46.33 mm of Hg and log Cg = log p - 4.269 = -2.60 expressed in moles per liter. Therefore Cs = 1.56 × 10-4 moles per liter. With the assumption of a solution density of 1.00 g mL-1, the corresponding mass percent is 0.0015 g(1)/100 g sln and the corresponding mole fraction, x1, is 2.7 × 10-6.
