Collect. Czech. Chem. Commun. 1979, 44, 637-651

Temperature dependence of heats of vaporization of saturated hydrocarbons C5-C8; Experimental data and an estimation method

Vladimír Majera, Václav Svobodaa, Slavoj Hálab and Jiří Picka

a Department of Physical Chemistry
b Laboratory of Synthetic Fuels, Prague Institute of Chemical Technology, 166 28 Prague 6


Heats of vaporization of a group of 10 alkanes C6-C8 and 2 cycloalkanes were measured in a temperature range of 25-80 °C. By combining the obtained results with selected literature data, a set of very accurate values of heats of vaporization as functions of temperature was made up for 22 saturated C5-C8 hydrocarbons. This set was employed for the verification of the proposed estimation method for the determination of heat of vaporization which is based on the principle of combination of a contribution method with constant entropy-of-vaporization rules. In this way it is then possible to estimate heats of vaporization of C4-C9 alkanes with an error lower than 0.5%.