Correlation Studies of Cyclohexanone/(C 5 -C 10 ) Alkan-1-ol Binary Mixtures: PC-SAFT Model and Free Volume Theory Bahman Sarkoohaki, † Mohammad Almasi,* ,‡ and Mehrnoosh Karimkhani † † Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran ‡ Department of Applied Chemistry, Faculty of Science, Malayer University, Malayer 65174, Iran * S Supporting Information ABSTRACT: In this article the behavior of cyclohexanone + 1-alkanol, namely, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, and 1- decanol, binary mixtures through the density and viscosity measure- ments has been studied as a function of composition and within the temperature range of 293.15-323.15 K. The excess molar volume and viscosity deviations have been calculated and fitted by the Redlich- Kister polynomial equation. For binary mixtures of cyclohexanone + 1- pentanol, values of excess molar volume are negative and for other mixtures are positive. For all binary systems viscosity deviations are negative and increase with the alkyl chain of alcohol. The results provide information on the interactions among the molecules in the pure state as well as the binary liquid mixtures. The measured densities and viscosities have been applied to test the applicability of the PC- SAFT and free volume models. ■ INTRODUCTION Thermophysical properties such as density and viscosity of pure liquids and their mixtures are important for chemical engineers in the design and optimization of industrial processes. The simultaneous investigations on the density and viscosity of mixtures may give an insight into the intermolecular interactions occurring in the liquid systems. Moreover, to estimate the mixture properties, such investigations are an introductory process for development of the equations. 1 Cyclohexanone is a polar compound (μ = 3.01 D) and exhibits dipole-dipole interactions in the pure state, but the association among its molecules is insignificant and does not compete with the high degree of association molecules such as alcohols. 2 Alcohols are an important class of hydrogen-bonded solvents, and their -OH group participates in hydrogen bond formation as a donor and acceptor of electrons. As a continuation of our research program, 3-5 here, the thermodynamic and transport properties of cyclohexanone with 1-pentanol, 1-hexanol, 1- heptanol, 1-octanol, 1-nonanol, and 1-decanol were inves- tigated. From the experimental data, excess molar volume and viscosity deviations have been calculated. Our initial studies in the area of solutions thermodynamics containing alcohols were motivated by a desire to better understand the interactions among the various functional groups with alcohols and also to contribute to a databank of thermodynamic properties of binary mixtures of alkanols. In particular, how could we interpret the results of theoretical calculations to make contact with the experimental data? The purpose of this study is to gain more information about the type and magnitude of the molecular interactions in the binary liquid systems and their effect on the excess and deviation properties. These types of research are interested in the chemical engineering field considering both cyclohexanone and 1-alkanols have plentiful applications in synthetic chemistry and industry. A literature survey of the thermodynamic and transport properties of these binary mixtures shows that very limited reports exist, and only few investigated systems have been studied earlier. 2,6,7 Moreover, this work contributes not only to testing the compatibility of the PC-SAFT model but also to correlating the viscosity of described systems by a combination of free-volume theory with the PC-SAFT model. ■ EXPRIMENTAL SECTION All chemicals (cyclohexanone, 1-pentanol, 1-hexanol, 1- heptanol, 1-octanol, 1-nonanol, and 1-decanol) were analytical grade and purchased from Merck with a stated level of purity greater than 99% of mass fraction and used as received without further purification. The pure component specifications are reported in Table 1. The measured densities and viscosities for pure materials at various temperatures are compared with the literature in Table 2. 8-17 The results show the measurements are in agreement with literature values and within the experimental uncertainties. The discrepancy may be due to the differences in the atmospheric pressure, sources of materials, amount, and sort of impurity. Received: March 14, 2018 Accepted: May 11, 2018 Article pubs.acs.org/jced Cite This: J. Chem. Eng. Data XXXX, XXX, XXX-XXX © XXXX American Chemical Society A DOI: 10.1021/acs.jced.8b00201 J. Chem. Eng. Data XXXX, XXX, XXX-XXX