Experimental and Predicted Excess Molar Enthalpies of the Ternary System tert-Butyl Methyl Ether + 1-Pentanol + Decane at 298.15 K

Abstract

Excess molar enthalpies of {x 1 tert-butyl methyl ether (MTBE) + x 2 1-pentanol+ (1 − x 1 − x 2)decane} and the involved binary mixtures {x tert-butyl methyl ether (MTBE) + (1 − x)decane} and {x 1-pentanol+ (1 − x)decane} have been determined at 298.15 K and atmospheric pressure over the whole composition range using a Calvet microcalorimeter. The results were fit by means of different variable-degree polynomials. In the present work, we propose a new expression to fit the ternary excess molar enthalpy, which takes into account the asymmetric shape of the involved binary systems. The group contribution model of the UNIFAC (in the versions of Larsen and Gmehling) were used to estimate excess enthalpy values. Several empirical expressions for estimating ternary properties from binary results were also tested.

Excess Molar Enthalpies of Ternary and Binary Mixtures Containing 2-Methoxy-2-Methylpropane, Ethanol, and Nonane

“…This trend is also observed in the published ternary systems MTBE + propanol + alkane (hexane, , octane, , nonane, decane) and MTBE + pentanol + alkane (octane, nonane, decane).…”

“…Besides, both for binary systems MTBE + alkane (hexane, , heptane, ,, octane, , nonane, decane , ) as for the binary mixtures ethanol + alkane (hexane, ,, heptane, , octane, ,, nonane, decane ,, ), excess molar enthalpy increases with the increasing chain length of the alkane.…”

“…This paper contributes to the series of ternary mixtures reported in earlier works, − where excess molar enthalpies of binary and ternary mixtures containing as components 2-methoxy-2-methylpropane (MTBE), alkanols, and alkanes, used as oxygenating agents in gasoline technology, were studied. All of them are part of the scientific project entitled “Study on Physical Properties of Mixtures Hydrocarbon + Alcohol + Ether Like Alternative Fuels”, whose main objective has been the characterization of nonelectrolyte liquids and their mixtures, through experimental determination of thermophysical properties on mixing.…”

“…Following the above considerations, it is desirable to know the thermodynamic properties of binary and ternary mixtures formed by MTBE, hydrocarbons, and alkanols. Our group has reported thermodynamic properties of various similar mixtures; − the study is now continued considering ethanol as second component and nonane as the third component in the present work. This should help to study the effect of alkane chain length in the binary mixtures involved and subsequent effects on the ternary mixture.…”

Excess Molar Enthalpies of Ternary and Binary Mixtures Containing 2-Methoxy-2-methylpropane, 1-Propanol, and Nonane

“…This paper is part of our systematic program of research concerning the experimental study of several thermodynamic and transport properties of binary and ternary liquid mixtures containing 2-methoxy-2-methylpropane, alkan-1-ol, and alkane used as oxygenating agents in gasoline technology. It is the continuation of previous works, [1][2][3][4][5][6][7][8][9][10][11] which form part of the scientific project entitled "Study on physical properties of mixtures Hydrocarbon + Alcohol + Ether like alternative fuels", where the main objective has been the characterization of nonelectrolyte liquids, and their mixtures, through experimental determination of thermophysical properties on mixing.…”