Refractive indices and static permittivities of systems containing n-hexane or n-heptane and isomeric chlorobutanes

•Refractive indices of n-hexane or n-heptane with isomeric chlorobutanes have been measured.•Static permittivities of the same mixtures have been also determined.•From experimental data the corresponding excess properties have been calculated and correlated.•Kirkwood correlation factors of the liquid mixtures have been estimated.

Refractive indices and static permittivities at temperatures of (283.15, 298.15, and 313.15) K and at pressure of 99.0 kPa were determined for the binary mixtures formed by n-hexane or n-heptane with isomeric chlorobutanes. Excess properties were obtained from the experimental values and correlated by means of a Redlich–Kister type equation. In addition, these results were used, together with available density values, to estimate at T = 298.15 K the Kirkwood correlation factors of the liquid mixtures. The behavior of this magnitude with composition was also discussed.

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