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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: fammmc@uvigo.es

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.