ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Dependence of the vapor pressure and activity coefficients on the composition of some two-component polar solvents

J. Surový and J. Dojčanský

Department of Chemical Engineering, Slovak Technical University, 880 37 Bratislava

Abstract:  In this paper the equilibrium P—x data are presented for some binary solutions of polar solvents, i.e. dimethylformamide, dimethyl sulfoxide, ethylene glycol, amyl alcohol, and aniline at 100°C. The data have been measured by static method. From the P—x data the coefficients of the relationship between the excess free enthalpy and composition have been calculated according to the Redlich — Kister and Renon NRTL equation. Half of the eight systems studied shows a positive and half a negative deviation from the properties of ideal solution, this deviation being small in the case of four pairs. In five cases of the reverse calculation of the vapour pressure of solution, the Redlich — Kister equation gives the results with equal average deviation as the NRTL equation; in two cases it is better to use the Redlich — Kister equation and in one case the Renon equation is more convenient.

Full paper in Portable Document Format: 283a313.pdf

Chemical Papers 28 (3) 313–323 (1974)