Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

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.