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Density measurements under pressure for the binary systems di-butyl ether + heptane or + cyclohexane at temperatures up to 343.15 K and at pressures up to 50 MPa


F. Aguilar1, F. Alaoui1, C. Chamorro2, J. Segovia2, M. Villamañán2 and E. Montero1

1Grupo de Ingeniería Energética, Escuela Politécnica Superior, Universidad de Burgos, Burgos, Spain
2Grupo de Termodinámica y Calibración TERMOCAL, Escuela de Ingenierías Industriales, Universidad de Valladolid, Valladolid, Spain

Keywords: high pressure, isothermal compressibility, volumetric properties
property: density
material: DBE

The increasing worldwide use of bio-fuels constitutes one of the measures considered to reduce greenhouse gas emissions. Bio-fuels also have an important part to play in promoting the security of energy supply, and promoting technological development and innovation. Di-butyl ether (DBE) is used as blending agent in reformulated gasoline and has been included in recent international regulations on the promotion of the use of energy from renewable sources for transport [1] The DBE acts as non-polluting, high octane number blending agent. DBE could be also used as cetane enhancer in bio-diesel fuel, and can be obtained as an added valued additive to second generation bio-fuels [2]. Ether + hydrocarbon mixtures are of interest as model mixtures for gasoline in which the ether act as non-polluting, high octane number blending agents. Despite of this interest, density data of binary mixtures containing ether + hydrocarbon at pressures other than the atmospheric pressure are very scarce in the literature. Density of the binary mixtures DBE + Heptane and DBE + Cyclohexane have been measured under pressure and reported in this work using a vibrating tube densimeter. The systems have been chosen in order to study the influence of pressure on the mixture density behaviour, but also because ethanol is coming to be a technical and industrial important compound in connection with reformulation of gasoline, in order to reduce pollution. Experimental densities for the compressed liquid phase of the binary systems DBE + Heptane and DBE + Cyclohexane have been measured at 283.15, 298.15, 313.15, 328.15 and 343.15 K and at eleven isobars up to 50 MPa. For each composition, the experimental values were correlated using a Tait-type equation. Furthermore, the excess molar volume and the isothermal compressibility were calculated from the density data. We acknowledge support for this research to the Ministerio de Ciencia e Innovación, Spain, Projects ENE2009-14644-C02-01 and ENE2009-14644-C02-02.

References
  1. Directive 2009/28/EC of the European Parliament ad of the Council on the promotion of the use of energy from renewable sources.

  2. R. Kotrba, Ahead of the Curve, Ethanol Producer Magazine, November (2005)

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