Recommended vapour and sublimation pressures and related thermal data for chlorobenzenes

Recommended data on vapour pressures are presented for all dichlorobenzenes , all trichlorobenzenes, and pentachlorobenzene in the temperature range fr om the triple point up to the normal boiling point. For some chlorobenzenes where reliable sublimation pressures and solid heat capacities are availab le (1,4-dichlorobenzene, 1,2,3-trichlorobenzene, 1,3,5-trichlorobenzene, an d pentachlorobenzene), recommended sublimation pressures are also given tha t cover the range from about -40 degrees C (with the exception of 1,4-dichl orobenzene where there are no experimental sublimation pressures below the phase transition at -1.38 degrees C) up to the triple point temperature. Th e data were developed by a simultaneous multi-property correlation of vapou r or sublimation pressures and the related thermal data (heat capacities in the liquid or the solid phase, heat capacities of the ideal gas, enthalpie s 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 a t the triple point. Recommendations are based mostly on new experimental va pour and sublimation pressures obtained recently by the authors. Solid and liquid heat capacities required for the simultaneous correlation were provi ded by merging new experimental data measured using a C80 Setaram heat cond uction calorimeter over approximate temperature range from 30 to 160 degree s C (depending on the compound) with the data critically selected from the literature. (C) 1999 Elsevier Science B.V. All rights reserved.