High-Pressure Vapor−Liquid Equilibrium for Dimethyl Ether + Ethanol and Dimethyl Ether + Ethanol + Water

Abstract

The first part of this paper is a review of experimental methods and the high-pressure phase behavior of dimethyl ether systems for which data have been published between 1932 and 1999. For the systems investigated, the references, temperatures, pressures, cell volumes, and experimental procedures are reported. The second part of this paper is high-pressure vapor-liquid equilibrium (VLE) data for the systems dimethyl ether (DME) + ethanol at (332.95, 353.25, and 373.15) K and dimethyl ether + ethanol + water at (333.55, 353.55, and 373.65) K. The experimental data are correlated using the Elliott-Suresh-Donohue (ESD-EOS) and Peng Robinson (PR-EOS) equations of state.

High-Pressure Vapor−Liquid Equilibrium for Dimethyl Ether + 2-Propanol and Dimethyl Ether + 2-Propanol + Water

“…In addition, the polarity of dimethyl ether makes it more compatible with water than propylene and propane. This observation agrees with our previous observation for the system dimethyl ether + ethanol + water .…”

“…The experimental apparatus is a dynamic circulation flow type apparatus where the vapor and the liquid are circulated inside the equilibrium cell. The details of the experimental equipment, calibrations, and operating procedures have been presented previously 1,5 and therefore will only be briefly described here.…”

“…This is our second report on vapor−liquid equilibrium measurements in binary and ternary systems involving dimethyl ether (DME). Earlier studies included measurements of phase equilibria in mixtures of dimethyl ether with ethanol, and dimethyl ether with ethanol and water …”

“…Earlier studies included measurements of phase equilibria in mixtures of dimethyl ether with ethanol, and dimethyl ether with ethanol and water. 1 The measurements for those systems covered three different isotherms and pressures up to the vicinity of the critical locus of the mixture.…”

VLE and VLLE Measurements of Dimethyl Ether Containing Systems

“…1 To produce DME on a large scale, a full knowledge of the many phase equilibria involved is required. Previously, a number of VLE data have been published, [2][3][4][5][6] but the only VLLE data found are for the system (CH 3 ) 2 O + H 2 O limited to 10 bar. 5 This work focuses on the phase behavior found in systems made by combinations of the five components N 2 , CO 2 , (CH 3 ) 2 O, H 2 O, and CH 3 OH, since all five components are involved when producing DME.…”