Excess Molar Enthalpies for Binary and Ternary Mixtures Containing Cyclic Ethers, Lactam and Cyclic Ketones

Abstract

Excess molar enthalpies $$ H_{{}}^{\text{E}} $$ for binary 1,3-dioxolane (1) + 1,4-dioxane (2) or N-methylpyrrolidin-2-one (2) + cyclohexanone or cycloheptanone (3) and $$ H_{123}^{\text{E}} $$ for ternary 1,3-dioxolane (1) + N-methylpyrrolidin-2-one or 1,4-dioxane (2) + cyclohexanone or cycloheptanone (3) mixtures have been measured over the entire mole fraction range at 308.15 K and atmospheric pressure using a micro differential calorimeter (Model-l DSC 7 Evo). The $$ H_{{}}^{\text{E}} $$ and $$ H_{123}^{\text{E}} $$ data have been correlated with composition by fitting of the corresponding data to the Redlich–Kister equation. The topology of the constituent molecules (Graph theory) has been utilized to predict $$ H_{123}^{\text{E}} $$ values of the present mixtures. It is observed that the $$ H_{123}^{\text{E}} $$ values calculated by Graph theory compare well with their corresponding experimental values. The $$ H_{123}^{\text{E}} $$ data have also been tested in terms of the Prigogine–Flory–Patterson (PFP) theory.