Thermophysical Study of 1-Butanol–PEG 200–NMP Mixture: Density, Viscosity, and Molecular Interactions

Abstract This work presents experimental results for the density and dynamic viscosity of the ternary system 1-butanol + polyethylene glycol 200 + N-methyl-2-pyrrolidone (NMP), and the corresponding binary system 1-butanol + N-methyl-2-pyrrolidone, measured over the temperature range from 288.15 to 323.15 K and at a pressure of 0.1 MPa. The investigated thermophysical properties were determined using an Anton Paar DMA 5000 densimeter and an Anton Paar SVM 3000 Stabinger viscometer. Based on the results obtained for the investigated systems, the excess molar volume and viscosity deviation were calculated and correlated using the Redlich–Kister (RK) polynomial equation for binary mixtures and the Nagata–Tamura (NT) polynomial equation for the ternary mixture. The analysis of molecular interactions, based on the obtained values of excess molar volume and viscosity deviation as a function of the ternary system composition is also presented.