Molecular interactions in the binary mixtures of some monoalkanolamines with acetonitrile between 303.15 and 323.15

Abstract

Densities, ρ, and refractive indices, nD for the binary systems of acetonitrile (ACN) + monoethanolamine (MEA), + monomethylethanolamine (MMEA), and + monoethylethanolamine (MEEA) have been measured in the whole range of composition and at different temperatures from T = (303.15 to 323.15) K for ρ, and at T = 303.15 for nD. Excess molar volumes, VmE, partial molar volumes, V¯i, thermal expansivities, α, and excess thermal expansivities, αE, were calculated from the experimental ρ. From measured nD at 303.15 K deviations in refractive index, ΔnD, and excess molar refractions, RmE, for these mixtures have also been evaluated. Values of VmE, αE, and RmE were found to be almost negative within the studied range of temperature. For each system the values of ρ, α, and nD were correlated to appropriate polynomials, whereas those of VmE, αE, ΔnD, and RmE were fitted to the Redlich-Kister type equations. Moreover, temperature dependent Jouyban-Acree model also showed satisfactory correlation with experimental ρ values for all the systems. Though intermolecular interactions of various types are to influence the variation patterns of VmE, V¯i, αE, and RmEvs. composition for these systems, it has been suggested that those due to cross H-bonding and interstitial accommodation effect have to play the significant roles.