J Solution Chem (2011) 40:955–967 DOI 10.1007/s10953-011-9701-7 Thermophysical Properties of Acetophenone with N,N-Dimethylethanolamine or with N,N-Diethylethanolamine at Temperatures of (303.15, 313.15 and 323.15) K and Pressure of 0.1 MPa K. Saravanakumar · R. Baskaran · T.R. Kubendran Received: 6 August 2010 / Accepted: 15 November 2010 / Published online: 24 May 2011 © Springer Science+Business Media, LLC 2011 Abstract Densities, viscosities and refractive indices have been determined for mixtures of acetophenone with N,N-dimethylethanolamine or with N,N-diethylethanolamine over the entire composition range at temperatures of (303.15, 313.15 and 323.15) K. The viscos- ity values were fitted to the Krishnan-Laddha and McAllister models. The thermophysical properties under study were also fitted to the Jouyban-Acree model. The excess values were correlated using the Redlich-Kister polynomial equation. It was found that, in all cases, the obtained data were correlated very well by the corresponding models. The molecular inter- actions existing between the components are also discussed. Keywords Viscosity · Density · Refractive index · Molecular interactions 1 Introduction Binary liquid mixtures have attracted considerable attention [1] due to their unusual behav- ior. In the chemical process industries, materials are normally handled in fluid form and, as a consequence, their physical, chemical, and transport properties assume importance. Thus data for some of the associated properties of liquids and liquid mixtures such as density, viscosity and refractive index find extensive applications in solution theory and molecular dynamics [2]. Such results are necessary for the interpretation of data obtained from ther- mochemical, electrochemical, biochemical and kinetic studies [3]. K. Saravanakumar ( ) Department of Chemical Engineering, St. Peter’s Engineering College, Avadi, Chennai 600054, India e-mail: saroo_1978@yahoo.co.in R. Baskaran Department of Chemical Engineering, St. Joseph’s College of Engineering, Chennai 119, India e-mail: rbaskaran2000@yahoo.com T.R. Kubendran Department of Chemical Engineering, A. C. College of Technology, Anna University, Chennai 600025, India e-mail: drtrkubendran@yahoo.com