Elsevier

Fluid Phase Equilibria

Volume 260, Issue 1, 25 October 2007, Pages 60-64
Fluid Phase Equilibria

High pressure vapor–liquid equilibrium measurements of carbon dioxide with naphthalene and benzoic acid

https://doi.org/10.1016/j.fluid.2006.06.011Get rights and content

Abstract

High pressure vapor–liquid equilibrium data for binary systems of carbon dioxide with naphthalene and benzoic acid were measured at three different temperatures for each system. Experimental temperatures and pressures ranged from 373 to 458 K and 0 to 22 MPa, respectively. Dew points were also measured for naphthalene in the CO2 rich region. The data measured provides valuable solubility information and is used to derive gas–solvent group interaction parameters for the predictive Soave–Redlich–Kwong equation of state.

Introduction

High pressure vapor–liquid equilibrium (VLE) data were measured for CO2 + naphthalene at 372.45, 403.85 and 430.65 K and for CO2 + benzoic acid at 403.28, 432.62 and 458.37 K. Several sets of VLE data exist for the CO2 + naphthalene system in open literatures [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35]. The data, however, are predominately in the temperature range from 308 to 328 K. A few data sets for CO2 + benzoic acid are available in literatures [36], [37], [38], [39], [40], [41] in the temperature range from 308 to 343 K. In order to increase the range of applicability, in terms of temperature, of the predictive Soave–Redlich–Kwong equation of state (EOS), measurements were undertaken at the elevated temperatures.

The correlation and prediction of VLE is possible with cubic equations of state which have mixing rules that incorporate excess Gibbs energy models [42], [43], [44], [45], [46]. Furthermore, group contribution approaches such as UNIFAC can be used so that the applicability of methods, such as the predictive Soave–Redlich–Kwong (PSRK) group contribution EOS [47], are not restricted to systems for which experimental data are available. Data measured in this work are useful as they make the creating and refining of VLE predictive methods (as mentioned above) possible.

Section snippets

Materials

Carbon dioxide was purchased from Messer–Griesheim with a purity of 99.999 mol%, and naphthalene (>98% GC) and benzoic acid (>99.5% GC) from Fluka. All chemicals were used without further purification. Naphthalene and benzoic acid are solids at room temperature but liquids at the temperatures for which data were measured.

Equipment and procedure

A static magnetically stirred pressure cell [48] constructed from titanium and thermally regulated with a stability of ±0.1 K in a temperature controlled air-bath was used to

Results

The Px data for CO2(1) + naphthalene(2) are presented in Table 2, the dew points in Table 3 and the Px–(ycalculated) data are plotted in Fig. 1 along with the literature data at similar temperatures. A good agreement between the experimental data from the different sources and compared to the calculated data is obtained.

The Px data for CO2(1) + benzoic acid(2) are presented in Table 4 and the Px–(ycalculated) data are plotted in Fig. 2.

The Henry's constants for the CO2(1) + naphthalene(2) and CO2

Conclusions

In this work experimental Px data and dew points are presented for naphthalene + CO2 and experimental Px data are presented for benzoic acid + CO2 systems. Most of the isotherms measured are new data and improve the understanding of these systems. The data measured in this work will be used to refine and create parameters for predictive VLE methods such the PSRK group contribution EOS.

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