Phase equilibria of the ternary systems of (water + diethyl carbonate) with acetone, or 2-butanone at four temperatures

doi:10.1016/j.jct.2016.06.033

The Journal of Chemical Thermodynamics

Volume 102, November 2016, Pages 147-154

https://doi.org/10.1016/j.jct.2016.06.033 Get rights and content

Highlights

•
LLE data of {water + acetone (or 2-butanone) + diethyl carbonate (DEC)} were measured at four temperatures.
•
LLE data were correlated by using the extended and modified UNIQUAC models.
•
Distribution coefficients and separation factors were calculated.

Abstract

(Liquid + liquid) equilibrium (LLE) for the ternary systems of {water + acetone + diethyl carbonate (DEC)} and (water + 2-butanone + DEC) were determined at T = (293.15, 298.15, 303.15, 313.15) K and p = 100 kPa. The reliability of the experimental LLE was verified by the Othmer-Tobias and Bachman equations. The experimental LLE values were correlated with the modified and extended UNIQUAC models. Distribution coefficients and separation factors were calculated from the LLE data to evaluate the extraction capability of the organic solvents.

Introduction

Diethyl carbonate (DEC), also called ethyl carbonate or carbonic acid diethyl ester has higher thermal efficiency [1], low bioaccumulation, persistence and its high reactive activity, which is considered as an environmentally benign chemical [2]. Since the precise (liquid + liquid) equilibrium (LLE) values for the ternary mixtures are important in designing many chemical processes and separation operations, in the recent years, the LLE investigations of ternary systems containing DEC have been the subject of much interest [3], [4], [5]. From the industrial point of view, phase equilibrium investigations supply essential information for the design and optimization of separation processes. In the purification of DEC, liquid phase equilibrium for these multicomponent mixtures have a significant role in the solvent extraction. The focus of this study is placed on the liquid phase behaviour for the systems of (water + acetone + DEC) and (water + 2-butanone + DEC) at T = (293.15, 298.15, 303.15, 313.15) K. We studied the influence of the temperature on the LLE of the ternary systems. The LLE measurements were correlated by the modified and extended UNIQUAC models [6], [7]. The reliability of the experimental tie-line was confirmed by using the Othmer-Tobias and Bachman equations [8], [9]. Distribution coefficients and separation factors were determined from the tie-line results to establish the extracting possibility of the organic ketones.

Section snippets

Experimental

The chemicals used in this work were acetone, 2-butanone and DEC. Bi-distilled water was used throughout all the experiments. The purities of the compounds were verified by gas chromatography, and shown in Table 1. The LLE measurements for the ternary (water + acetone, or 2-butanone + DEC) mixtures were carried out at T = (293.15, 298.15, 303.15, 313.15) K and p = 100 kPa. The LLE experimental vessel includes a jacketed glass cell (internal volume about 200 mL), a thermostatically controlled bath, and a

Calculated results and discussion

The modified and extended UNIQUAC models were used to correlate the experimental results. Table 6 lists the values of volume and surface area parameters of pure component, r and q, which were taken from the literature [3], [18]. The interaction correction factor of pure component q′ was taken from the literature [6], [7]. The binary parameters for completely miscible mixtures were obtained from experimental (vapour + liquid) equilibrium (VLE) data by using a computer program according to

Conclusions

The LLE for the ternary systems of (water + acetone + DEC) and (water + 2-butanone + DEC) were investigated at T = (293.15, 298.15, 303.15, 313.15) K. The experimental LLE values were correlated satisfactorily by the modified and extended UNIQUAC models. The correlation results of the modified UNIQUAC model are in much better agreement with the experimental LLE results. The consistency of the experimental LLE results was ascertained by applying the Othmer-Tobias and Bachman equations.

The calculation

Acknowledgments

The authors thank the financial support from National Scientific Research Found of China (21271088).

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Phase equilibria of the ternary systems of (water + diethyl carbonate) with acetone, or 2-butanone at four temperatures

Highlights

Abstract

Introduction

Section snippets

Experimental

Calculated results and discussion

Conclusions

Acknowledgments

J. Chem. Thermodyn.

Fluid Phase Equilib.

Fluid Phase Equilib.

Energy Fuels

Green chemistry: Challenging perspectives

Fluid Phase Equilib.

J. Chem. Eng. Data

J. Solution Chem.

Ind. Eng. Chem.

Ind. Eng. Chem.