Add time:08/28/2019         Source:sciencedirect.com

Densities of the binary liquid mixtures of 2-ethyl-1-butanol + dibutyl ether (DBE) or ethylene glycol mono butyl ether (EGMBE), 2-methyl-1-butanol + DBE, have been measured as a function of the composition at temperature range of 293.15 to 313.15 K and atmospheric pressure. The measurements have been carried out using an Anton Paar model DMA 4500 oscillating u-tube densitometer. The excess molar volume, VmE, the excess thermal coefficient, αE, and the isothermal expansion coefficient of excess molar enthalpy, (∂HmE/∂P)T,x, were calculated from the experimental densities. It is indicated that the excess molar volume is negative for 2-methyl-1-butanol + DBE over the entire mole fraction range, and decreases with increasing temperature. The VmE value is positive for the binary mixture of EGMBE + 2-ethyl-1-butanol over the entire mole fraction range, and decreases with increasing temperature. This quantity is negative for the binary mixture of 2-ethyl-1-butanol + DBE over the entire mole fraction range, and decreases with increasing temperature in the limit of pure ether and increases with increasing temperature in the limit of pure alcohol. The excess molar volumes were correlated with Redlich–Kister equation.

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