Thermodynamic properties of mixtures play a crucial role in the design of chemical separation equipments. The objective was to determine the enthalpy of mixing and vaporization of binary mixture (Ethyl acetate – 2-Butyl alcohol and Methyl acetate – Methyl alcohol) at ambient pressure. The experiments were carried out in two phases. Initially, enthalpy of mixing was measured at 298 and 308 K, and later, the heat of vaporization was conducted for the same mixtures. The enthalpy of mixing was measured by static calorimetric method using cylindrical Dewar flask at varied composition. The mixing enthalpies of Methyl acetate – Methyl alcohol are positive over entire composition with an average percentage deviation of –0.032 and –0.01 at 298 and 308 K. Ethyl acetate – 2-Butyl alcohol are also positive over the entire composition with an average percentage deviation of –0.025 and –0.003 at 298 and 308 K. Furthermore, the heat of vaporization was measured by evaporative method using a flow calorimeter. In this phase, the average percentage deviation of Methyl acetate – Methyl alcohol is –0.056 and Ethyl acetate – 2-Butyl alcohol is 1.06. The experimental results can be used to define the thermodynamic property of binary mixtures and to analyze intermolecular interaction. The data can be used in design calculation of chemical separation equipments.

Mass and heat balances are the important tasks of any process development work which involves thermodynamic properties like enthalpy of mixing and heat of vaporization. The word enthalpy of mixing means the change in the enthalpy per mole of solution formed when pure components are mixed at the same temperature and pressure. Heat of vaporization refers to the amount of heat required to change a unit amount of liquid at bubble point (saturated liquid) to a vapor at its dew point (saturated vapor). When two pure solvents are mixed at a defined temperature and pressure, the thermodynamic property will be affected by the intermolecular interaction, inductive polar effect and the H-bonding as explained by Carlo (2006).

In the present study, an interaction between the polar group of aliphatic alcohols and the carbonyl group of aliphatic ketones play a crucial role at the intermolecular level interaction and at the practical applications level (Venkatesu et al., 2006). The enthalpy of mixing data is used in the study of intermolecular interactions, thermodynamic properties, and to carry out the industrial processes (Iloukhani et al., 2000; and Hamoudi et al., 2006). Enthalpy of vaporization data is used in the design calculation of chemical separation equipments in aromatic industries. Moreover, the thermodynamic and physical properties of alcohols with ketones have significant implications in the pharmaceutical, chemical and aromatic industries (Venkatesu and Rao; 1996; Venkatesu et al., 1999; and Radhamma et al., 2007 and 2008). A literature survey reveals that no study has been conducted on enthalpy of mixing and vaporization for these mixtures. A part of our research program explores the thermodynamic properties of the two defined binary mixtures.

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