IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Ethene with Dimethylbenzenes (xylenes)
Components:
   (1) Ethene; C2H4; [74-85-1]  NIST Chemistry WebBook for detail
   (2) Dimethylbenzenes (xylenes); C8H10; [108-38-3]  NIST Chemistry WebBook for detail
Original Measurements:
   Hannaert, H.; Haccuria, M.; Mathieu, M.P., Ind. Chim. Belge 1967, 32, 156-164.

 Variables:
   Temperature = 243.15 K to 293.15 K
   Pressure = 101.3 kPa

 Prepared By:
   W. Hayduk

 Experimental Remarks:
   The authors definitions are:

ΔH = 2,440 cal mol–1, Enthalpy of dissolution

K = y1/x1 = mole fraction gas in gas phase ÷ mole fraction gas in liquid phase

π/ atm = total pressure

ν = coefficient of fugacity

The function, Kπν/atm, is equivalent to a Henry’s constant in the form H1,2/atm = (ƒ1/atm)/x1 where ƒ1 is the fugacity.

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

t/°CT/KMole Fraction (x1)x1 Note
−30243.150.03681
−10263.150.02511
10283.150.01801
20293.150.01551
 Notes:
   1  Mole fraction solubility calculated by compilers for a gas partial pressure of 101.3 kPa using the equation developed by the authors with ν = 1, for the applicable temperature range:
log (Kπv) = 3.63 – (Δπ / cal mol–1)/(2.3R(T/K) )

The Authors definitions are:
ΔH = 2,440 cal mol–1 , Enthalpy of dissolution

K = y1/x1 = mole fraction gas in gas phase / mole fraction gas in liquid phase

π / atm = total pressure
ν = coefficient of fugacity


 Method/Apparatus/Procedure:
   The authors describe several methods used; the one used in this case is the least accurate. The apparatus is of glass and consists of a burette in which the gas is confined over mercury, two bulbs for the solvent, one above the other, a mercury manometer and a constant temperature bath. A measured volume of solvent is degassed in the top bulb at ambient temperature and charged to the absorption bulb in the bath. Gas is charged to the desired pressure. The quantity of gas added at constant pressure is measured. Agitation is manual.

 Source and Purity of Materials:
   1. Ethene. Air Liquide. For narcosis, 99.9 per cent.
   2. Dimethylbenzenes. Merck and Co. Mixture of 90% dimethylbenzenes, 5% methylbenzene, and 5% ethylbenzene.

 Estimated Errors:
   Solubility: δx1/x1 = ± 10 to 15% (authors)