Elsevier

Fluid Phase Equilibria

Volume 257, Issue 2, 25 August 2007, Pages 207-211
Fluid Phase Equilibria

Volumetric property for carbon dioxide + methyl acetate system at 313.15 K

https://doi.org/10.1016/j.fluid.2007.01.033Get rights and content

Abstract

Volumetric properties were measured for carbon dioxide + methyl acetate system at 313.15 K and pressures to 10 MPa, using the vibrating tube Anton Paar DMA 512P density meter. In the present experiments, no analytical instrument is required. The saturated pressure was further measured for carbon dioxide + methyl acetate system at 313.15 K by the synthetic method. The experimental volumetric data obtained were correlated with the modified Tait equation.

Introduction

Methyl acetate is widely used as an extraction solvent and a spice in the industry. The volumetric properties and vapor–liquid equilibria (VLE) are required for the design and operation of the separation equipment with supercritical fluids.

For carbon dioxide + methyl acetate system, vapor–liquid equilibria were reported by Ohgaki and Katayama [1], without the volumetric data. In the present study, the volumetric properties were measured in the homogeneous region for carbon dioxide + methyl acetate at T = 313.15 K. The saturated pressures were further measured by the synthetic method.

Section snippets

Materials

The carbon dioxide was supplied by Showa Tansan Co. Ltd. with a mole fraction purity of 0.99999. Methyl acetate was supplied by Kanto Chemical Co. Inc. and used without further purification. The purity of methyl acetate was determined to be 99.9% from gas chromatograph peak areas. The physical properties of methyl acetate used in this work are listed in Table 1.

Apparatus and procedures

The experimental apparatus is schematically shown in Fig. 1. The apparatus is the same as that described previously [2], [3], [4], [5],

Results and discussion

The experimental densities of fixed compositions for carbon dioxide + methyl acetate system at 313.15 K and pressures to 10 MPa are shown in Table 2, and Fig. 3, Fig. 4. Table 3 and Fig. 5 show the experimental saturated density of vapor and liquid phases at equilibria. Fig. 6 shows the pressure-composition diagram for carbon dioxide + methyl acetate system at 313.15 K, including the experimental data and the ones in literature. The solid lines in Fig. 6 denote the smoothed experimental curves. The

Correlations

The experimental volumetric data were correlated as follows.

The Tait equation [7], [8] is given by,ρ=ρref1clnβ+Pβ+Pref1where ρref and Pref are the reference density and pressure and c and β are fitting parameters.

In the present study, the reference state was given at P = 10 × 106 PaPref=10×106Pa

The experimental reference densities ρref at P = 10 × 106 Pa were correlated byρref=ρ0ref+mx11+κx12+ξx121+τx12+ψx12where x1 is the mole fraction of carbon dioxide.ρ0ref=917.1kgm3m=39.28κ=1.623ξ=0.082τ=

Conclusion

Volumetric properties were measured for carbon dioxide + methyl acetate system at 313.15 K and pressures to 10 MPa, using the vibrating tube Anton Paar DMA 512P density meter. In the present experiments, no analytical instrument is required. The saturated pressure was further measured for carbon dioxide + methyl acetate system at 313.15 K by the synthetic method. The experimental volumetric data obtained were successfully correlated with the modified Tait equation.

    List of symbols

    A, B, C

    parameters in Eq. (11)

    c

Acknowledgements

This research was partially supported by a Grant from the Ministry of Education, Culture, Sports, Science and Technology to promote multidisciplinary research projects on “Study of ecological life cycles in local cities and middle grade mountain areas and the information and communication technology indispensable for their support” at Nihon University, College of Engineering (Head Investigator: Prof. Motohisa Onozawa).

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