high-pressure density of the binary system dimethyl...
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HIGH-PRESSURE DENSITY OF THE BINARY SYSTEM
DIMETHYL CARBONATE + n-OCTANE ANA GAYOL1, MARTA M. MATO1*, LIDIA CASÁS2, JOSÉ LUIS LEGIDO1
1Department of Applied Physics, University of Vigo, Campus As Lagoas Marcosende s/n, 36310 Vigo, España. 2Laboratoire de Thermique, Energétique et Procédés (LaTEP), ENSGTI – UPPA, Rue Jules Ferry - BP 7511, 64075 PAU Cedex – France.
e-mail: [email protected]
Introduction
The dimethyl carbonates are useful organic solvents for the chemical industry [1,2]. Moreover, these molecules with base carbonate and containing an aromatic and
an aliphatic parts have an important industrial interest as gasoline additives and as lubricants in the replacement of CFCs (chlorofluorocarbons) with the new
refrigerants HFCs (hydrochlorofluorocarbons) [3]. These industrial uses are the reason why there has been considerable upsurge in the theoretical and
experimental investigations of dimethylcarbonates and of their mixtures with other compounds [4].
This work presents a PVT study for dimethyl carbonate and n-octane pure components and their binary mixture (dimethyl carbonate + n-octane) in the temperature
range of (288.15 – 308.15) K and pressures between (0.1 and 40) MPa. The experimental density values were compared with experimental information available in
the literature [5-9]. The purpose of this study is to extend the available experimental information about the thermophysical behaviour of this binary system, which is
useful in fuel field.
A modified Tait equation [10] has been used in order to fit the density values and to obtain the derived properties such as isothermal compressibility coefficient,
isobaric thermal expansivity coefficient and internal pressure. Besides, the ability of the Nitta–Chao [11] model for the prediction of density values and derived
properties for these mixtures had been tested. Results and discussion
Acknowledgments
We thank María Perfecta Salgado González and Sofia Baz
Rodríguez for their collaboration with the technical measures
Material and Methods
The binary mixtures were prepared by mass using a Mettler AE-240 balance, the materials
had been previously degassing.
The density was measured with an Anton Paar DMA 512 P/60 vibrating-tube densimeter
connected to an Anton Paar DMA 4500 data acquisition unit.
Conclusions
Nitta-Chao group contribution model describes correctly the high
pressure density and their derivate properties such as isobaric
thermal expansivity coefficient, isothermal compressibility
coefficient and internal pressure of the pure components and the
dimethyl carbonate + n-octane binary mixture.
Ultrasonic Degassing Materials
Anton Paar DMA 512P
High Pressure
Input Sample
Balance
RUSKA 7610 High Pressure
PolyScience 9510
thermostatic bath
Anton Paar DMA 4500 Densimeter
Comparison between experimental high pressure density of the mixture
dimethylcarbonate+n-octane at T = 288.15 K, 298.15 K, ▼ 308.15 K and literature:
T=○283.15 K, □ 293.15 K, 303.15 K.Solid Lines are the correlations by means of Tait
equation.
Comparison between experimental data and Nitta – Chao predictions (Solid Line).
x1=0.35475 for isotermal compressibility against pressure at T = 288.15 K, 298.15 K,
▼ 308.15 K
High pressure density of the mixture dimethylcarbonate+n-octane against pressure x1
= ● 0.0535, 0.0978, 0.1751,○0.2912, 0.3935, Δ0.,959, ♦0.5475, ◊ 0.5936, ▼
0.7001, 0.8012, 0.8979, ⌂0.9502 at 308.15 K . Solid Lines are the predictions
obtained with Nitta –Chao model.