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6251577 
Journal Article 
Measurements of the isobaric heat of mixing for gaseous mixtures CH4-Ar, CH4-N2, H2-CH4, He-CH4 and He-Ar between 170 and 293 K and at pressures up to 120 atm 
Beenakker, JJM; Van Eijnsbergen, B 
1968 
39 
4 
499-518 
The heat of mixing of five binary mixtures has been measured at constant temperature and pressure and in three mole fractions. Applicating an apparatus in which the cooling upon mixing is compensated electrically it is possible to determine the amount of the heat of mixing directly from the heating power. At room temperature a nearly linear relation between the heat of mixing and pressure is found. At temperatures near the critical temperature of one of the components of the mixture a remarkable maximum between 70 and 80 atm in the heat of mixing against pressure is measured. A qualitative consideration of these maxima has been given by comparison of the four methane mixtures and the so-called expansion model. The value of the maximum depends on the critical temperature of the non-methane component of the mixture.