Collect. Czech. Chem. Commun. 1985, 50, 153-166

Liquid-liquid equilibrium of ternary systems water-glycol-aromatic hydrocarbon

František Lešek, Josef Eichler and Miroslav Balcar

Research Institute of Synthetic Resins and Lacquers, 532 07 Pardubice


By using the method of determining cloud point, the liquid-liquid equilibria of the systems water-1,2-propanediol-toluene, water-1,2-propanediol-xylene, water-1,3-butanediol-toluene and water-1,3-butanediol-xylene were measured within the range of 40 °C up to azeotropic points at atmospheric pressure. The solubility of the hydrocarbons w3 in the glycols has increased with temperature t according to the relation w3 = (A-Bt)-1, where A and B have been functions of water content in the glycols. The solubility of the water(l)-glycol(2) binary system in the hydrocarbons has increased with temperature according to the relation (w1 + w2) = C exp (Dt). The decrease of mutual solubilities of toluene or xylene in aqueous 1,2-propanediol or 1,3-butanediol was found experimentally to be proportional to the increasing content of water in glycols.