Thermodynamics of 1-alkanol + cyclic ether mixtures

1-Alkanol + cyclic ether mixtures have been investigated in terms of the DISQUAC and ERAS models and using the concentration–concentration structure factor (SCC(0)). The corresponding interaction parameters are reported. DISQUAC interaction parameters for the systems 1-alkanol + 1,7,10,13,16-hexaoxacyclooctadecane (18CE) and methanol + 1,3,5-trioxane are also given. DISQUAC correctly describes a whole set of thermodynamic properties: vapor–liquid equilibria, VLE, molar excess enthalpies, HE, solid–liquid equilibria, SLE, and SCC(0) of the binary systems. HE of 1-alkanol + cyclic ether + alkane mixtures are fairly well represented by DISQUAC using binary parameters only. ERAS provides a semiquantitative description of the investigated mixtures due to the fact that main contribution to their thermodynamic properties is usually the physical one.1-Alkanol + cyclic ether systems are characterized by dipolar interactions and homocoordination. Interactions between unlike molecules are stronger in mixtures with tetrahydrofuran (THF) or 1,3-dioxolane, when are compared with those present in solutions with tetrahydropyran (THP) or 1,4-dioxane. The DISQUAC interaction parameters underline that proximity effects are more relevant in systems with 1,3-dioxolane or 1,3,5-trioxane. THP, 1,4-dioxane and 18CE form a homologous series in the framework of DISQUAC.