High-pressure Vapor-Liquid Equilibrium Studies for DME-CO2-CH3OH and DME-CO2-C2H5OH Systems

Abstract

Abstract: In this study, the Gibbs-Duhem equation was applied to make the thermodynamic consistency test and thermodynamic model estimation for systems of CO2-DME (dimethyl ether), DME-CH3OH, CO2-CH3OH and DME-C2H5OH systems on the basis of the vapor-liquid equilibrium (VLE) experimental data in published reports. And the NRTL binary interaction parameters of the systems mentioned above were regressed by the VLE data and were subjected to a thermodynamic consistency test because the study showed that PR-NRTL model combination was appropriate for the four systems mentioned above. The regressed binary interaction parameters were used to es-timate the VLE for DME-CO2-CH3OH at temperatures of 313.15K and 333.15K, and the estimated result was coin-cident with the experimental data. On the basis of the predicted VLE data for systems of DME-CO2-CH3OH and DME-CO2-C2H5OH, the VLE behaviors of the two systems were studied by the phase diagrams of these two ter-nary systems, with the forms of both the two dimensional and three dimensional phase diagrams, respectively.

Key words: phase equilibria, model reduction, dimethyl ether, phase diagram

摘要： In this study, the Gibbs-Duhem equation was applied to make the thermodynamic consistency test and thermodynamic model estimation for systems of CO2-DME (dimethyl ether), DME-CH3OH, CO2-CH3OH and DME-C2H5OH systems on the basis of the vapor-liquid equilibrium (VLE) experimental data in published reports. And the NRTL binary interaction parameters of the systems mentioned above were regressed by the VLE data and were subjected to a thermodynamic consistency test because the study showed that PR-NRTL model combination was appropriate for the four systems mentioned above. The regressed binary interaction parameters were used to es-timate the VLE for DME-CO2-CH3OH at temperatures of 313.15K and 333.15K, and the estimated result was coin-cident with the experimental data. On the basis of the predicted VLE data for systems of DME-CO2-CH3OH and DME-CO2-C2H5OH, the VLE behaviors of the two systems were studied by the phase diagrams of these two ter-nary systems, with the forms of both the two dimensional and three dimensional phase diagrams, respectively.

关键词: phase equilibria;model reduction;dimethyl ether;phase diagram

ZHENGDanxing, WUXianghong, CAOWen, WANGNing. High-pressure Vapor-Liquid Equilibrium Studies for DME-CO2-CH3OH and DME-CO2-C2H5OH Systems[J]. .

郑丹星, 武向红, 曹文, 王宁. DME-CO2-CH3OH和DME-CO2-C2H5OH体系的高压汽液相平衡研究[J]. CIESC Journal.

References

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