Vapor-liquid equilibria of toluene+n-butanol and toluene+n-butanol+calcium chloride at 94.0kPa

摘要

Vapor-llqulG equl1lbnum data or toluene+n-butanol and toluene+n-butanol+CaCI2 (at aturation) were measured at a pressure of 94.0 kPa, using a modified Malanowski equilibrium till. The salt investigated in this work, i.e., CaCI2, exhibits a slight salting-out effect on toluene. 'he experimental results of the salt-free binary were compared with those obtained from RTL, ASOG, and UNIFAC models. The latter two models predicted the bubble-point tem- ,eratures within 0.5 K (as a root mean square deviation, RMSD) whereas the NRTL model, lhich was employed to establish thermodynamic consistency by directly fitting the experimen- 3.1 data, correlated the bubble-point temperatures with an RMSD of 0.2 K. On the other hand, Ile experimental data of toluene +n-butanol+CaCI2 were compared with those predicted by Ile NR TL- Tan model for the effect of the electrolyte. This model predicted the bubble-point ~mperatures with an RMSD ofO.5K. Calcium chloride has been shown not to have a sensible ffect on the azeotropic composition.