Excess Molar Enthalpies of 1-Octanol with Ethylbenzene, Ethyl Benzoate, Acetophenone, Anisole, or Methanol at 298.15 K

Abstract

Excess molar enthalpies, H E , of binary mixtures of 1-octanol with ethylbenzene, ethyl benzoate, acetophenone, anisole, or methanol have been measured at 298.15 K under atmospheric pressure using an isothermal microcalorimeter. The experimental H E values are positive for all the binary mixtures over the entire range of compositions. The experimental data have been correlated with the modified Redlich-Kister polynomial equation. The results were qualitatively interpreted in terms of thermodynamic molecular interactions between the mixing components.

Excess Molar Enthalpies for Binary Mixtures of Ethanol + Acetone, + Octane, + Cyclohexane and 1-Propanol + Acetone, + Octane, + Heptane at 323.15 K

“…A flow-type isothermal microcalorimeter (model: 4400 IMC, Calorimeter Science Corporation, USA) was used in this study to measure the enthalpy changes of mixing. The schematic diagram and the procedure of the operations have been detailed in elsewhere . The apparatus consists of a flow-mixing cell, a reference cell, a thermostatic water bath, a data acquisition system, and two liquid pumps (model: PU-1580, JASCO, Japan) with an on-line degasser (model: DG-1580−50, JASCO).…”

“…The variables V m ° and V m are the voltage of the baseline and the voltage during mixing, respectively, which are indicated from the data acquisition system. As noted by Lien et al, ε m , the calibration coefficient for mixture runs, is given as where ( a 01 , a 11 ) and ( a 02 , a 12 ) are the calibration constants for the streams 1 and 2, respectively. Because these calibration constants are dependent on temperature for a specific constituent compound, their values were determined by fitting the voltages of mixing to eq 1 with reliable literature H E data of related mixtures at the temperature of interest, 323.15 K in this work, prior to measuring a system.…”

“…The schematic diagram and the procedure of the operations have been detailed in elsewhere. 6 The apparatus consists of a flow-mixing cell, a reference cell, a thermostatic water bath, a data acquisition system, and two liquid pumps (model: PU-1580, JASCO, Japan) with an on-line degasser (model: DG-1580-50, JASCO). The degasser was used to remove the trace amount of noncondensable gas from the chemicals continu-ously, before entering the liquid pumps and then the mixing cell.…”

Excess molar enthalpies for binary mixtures of ethanol + benzene, + cyclohexane, + propyl acetate and 1-propanol + benzene, + cyclohexane, + heptane at 348.15K

“…The schematic diagram and the procedure of the operations have been reported previously [14]. The apparatus consists of a flow-mixing cell, a reference cell, a thermostatic water bath, a data acquisition system, and two liquid pumps (model: PU-1580, JASCO, Japan) with an online degasser (model: DG-1580-50, JASCO).…”

“…The value of V o m is much smaller (<0.1%) than that of V m . According to our previous work [14], the calibration coefficient for mixing runs, ε m , was expressed as…”