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The prediction of the properties of mixtures containing n-alkanes is of great interest in the petroleum industry and consequently the critical properties of n-alkane+n-alkane mixtures have been investigated by many workers. Previously we used the segment concept to correlate the critical temperatures of n-alkanefnalkane mixtures using only the pure n-alkane critical temperatures.1 We have also compared the critical temperatures of a range of quasi-spherical molecule mixtures with those predicted from the van der Waals theory.2-4 There are several reasons for expecting that the agreement between the van der Waals treatment and experiment will be poor4 for mixtures containing n-alkanes. The component molecules are not, in general, even approximately spherical and the molecules do not obey the same principal of corresponding states.5 However, in this paper i t is shown that agreement is surprisingly good.

Gas-liquid critical temperatures of n-alkane+n-alkane and cycloalkane+n-alkane mixtures