Recommended vapour and sublimation pressures and related thermal data for chlorobenzenes

Abstract

Recommended data on vapour pressures are presented for all dichlorobenzenes, all trichlorobenzenes, and pentachlorobenzene in the temperature range from the triple point up to the normal boiling point. For some chlorobenzenes where reliable sublimation pressures and solid heat capacities are available (1,4-dichlorobenzene, 1,2,3-trichlorobenzene, 1,3,5-trichlorobenzene, and pentachlorobenzene), recommended sublimation pressures are also given that cover the range from about −40°C (with the exception of 1,4-dichlorobenzene where there are no experimental sublimation pressures below the phase transition at −1.38°C) up to the triple point temperature. The data were developed by a simultaneous multi-property correlation of vapour or sublimation pressures and the related thermal data (heat capacities in the liquid or the solid phase, heat capacities of the ideal gas, enthalpies of vaporisation or sublimation). The data are presented as parameters of the Cox correlation equation which has an identical form for description of vapour–solid (v–s) and vapour–liquid (v–l) equilibria and are consistent at the triple point. Recommendations are based mostly on new experimental vapour and sublimation pressures obtained recently by the authors. Solid and liquid heat capacities required for the simultaneous correlation were provided by merging new experimental data measured using a C80 Setaram heat conduction calorimeter over approximate temperature range from 30 to 160°C (depending on the compound) with the data critically selected from the literature.