Collect. Czech. Chem. Commun. 1987, 52, 258-263

A modified Gillespie still for measuring vapour-liquid equilibria

Elena Graczová, Táňa Huňarová and Július Surový

Department of Chemical Engineering, Slovak Institute of Technology, 812 37 Bratislava


A modification of the Gillespie still for measuring vapour-liquid equilibrium data is described. The still was tested at different working pressures within the range of 3.7 to 86.7 kPa by measuring the isothermal L-G equilibrium data for the binary system p-xylene-dimethylformamide at the temperatures of 60, 80, 100, 120, and 130 °C. The dependence of activity coefficients of components on composition was expressed by means of the Redlich-Kister and Wilson equations. The consistency of the experimental data as well as the agreement of some measured values with the data from literature furnishes an evidence of good functioning of the apparatus.