Abstract
In this work, a thermodynamic model for the prediction of gas-liquid equilibrium at moderate pressures (up to 6 bar) and different temperatures (288-323 K) for the ternary system of carbon dioxide (1)-(2) mixture (ethanol-water) is established using Soave/Redlich/Kwong equation of state (SRK-EOS). Two different mixing rules were used to show the effect of the type of mixing rule. A comparison of experimental phase equilibrium data in the literature with the predicted results showed very good representation for one mixing rule and good for the other.
Highlights
The solubility of gases in liquids has been under intense investigation over the past three decades since the knowledge of gas solubility data in pure liquids and in mixed solvents which plays an important role in several industrial processes, such as the carbonation of alcoholic beverages and soft drinks, gas absorption, stripping columns, wastewater treatment, etc.From theoretical point of view, the solubility of gases in liquids, especially in the dilute region, is a matter of great interest
The results for Soave/Redlich/Kwong equation of state (SRK-EOS) for CO2(1)-mixture (2) at moderate pressure and different temperature is compared with the experimental data obtained by Dalmolin, et al.[1]
When the SRK-EOSis introduced into Eq (1), closed-form for fugacity coefficient is obtained in the liquid phase, as in Eq 2 ln φil bi bm
Summary
The solubility of gases in liquids has been under intense investigation over the past three decades since the knowledge of gas solubility data in pure liquids and in mixed solvents which plays an important role in several industrial processes, such as the carbonation of alcoholic beverages and soft drinks, gas absorption, stripping columns, wastewater treatment, etc.From theoretical point of view, the solubility of gases in liquids, especially in the dilute region, is a matter of great interest. The advantages of low-pressure gas solubility over high-pressure equilibrium data relies on the fact that inaccuracies introduced by possible necessary semi-empirical relations (for example, for the partial molar volume of solute at infinite dilution in the solvent) have essentially no effects on the final results and the thermodynamic treatment is much facilitated by well-defined assumptions[1]. Accurate thermodynamic data such as volumetric properties and phase equilibria of pure compounds and mixtures (i.e.CO2 + alkanes, CO2 + alkanols) are of great significance in the chemical, oil and biotechnology areas, and for the development and validation of thermodynamic models. The results for SRK-EOS for CO2(1)-mixture (2) (ethanol-water) at moderate pressure and different temperature is compared with the experimental data obtained by Dalmolin, et al.[1]
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