Add time:07/24/2019         Source:sciencedirect.com

Excess molar enthalpies, HmE of binary mixtures of 2-butoxyethanol with methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol and butan-2-ol were calculated from calorimetric data at T = 298 K and ambient pressure (81.5 kPa). Calorimetric measurements were performed with employing a Parr 1455 solution calorimeter in an isolated room. All the binary mixtures showed endothermic behavior except 2-butoxyethanol + methanol mixture which showed exothermic behavior over the entire range of compositions. The experimental data were then used to calculate excess partial molar enthalpies, HiE and excess partial molar enthalpies at infinite dilution, HiE,∞. The maximum HmE values were observed about 0.45–0.5 mol fraction of 2-butoxyethanol. HmE increases as the length and the branch chains of the alcohols increase. Finally, the experimental results were correlated by using the Redlich–Kister equation and three thermodynamic models (Wilson, NRTL, and UNIQUAC) based on the local composition theory.

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