Vapour pressures and enthalpies of vaporization of a series of the linear n-alkyl-benzenes

Vapour pressures and the molar enthalpies of vaporization ΔlgHm of the linear alkyl-benzenes C6H5CnH2n + 1 with the alkyl chain length n = 5, 7, 10, and 11 have been determined by the transpiration method. Kovat’s indices of the linear and branched alkyl-benzenes C1 to C16 were collected from the available literature. A linear correlation of enthalpies of vaporization ΔlgHm at T = 298.15 K of the alkyl-benzenes with the number of carbon atoms, as well as with the Kovat’s indices on the non-polar GC columns has been found. A simple GC-correlation approach for correlation and accurate predictions of vapour pressures and vaporization enthalpies of mono- and poly-alkyl-substituted benzenes has been suggested.