High-Pressure Vapor−Liquid Equilibria in the Systems Nitrogen + Dimethyl Ether, Methanol + Dimethyl Ether, Carbon Dioxide + Dimethyl Ether + Methanol, and Nitrogen + Dimethyl Ether + Methanol

Abstract

Isothermal (P, T, x, y) data have been measured for the binary and ternary systems nitrogen + dimethyl ether at 15, 35, and 45 °C, dimethyl ether + methanol at 80 °C, carbon dioxide + dimethyl ether + methanol at 40 and 60 °C, and nitrogen + dimethyl ether + methanol at 40 and 15 °C. The pressure range under investigation was up to 9.5 MPa. The experimental data for the binary systems were correlated with the SRK equation of state using the MHV2 mixing rule combined with the UNIFAC or UNIQUAC model for the expression of the excess Gibbs energy. The experimental data for the ternary systems have been compared with those predicted by means of the same models, and the results are discussed by comparison. The binary system of nitrogen + dimethyl ether as well as the two ternary systems have not previously been studied.

Modeling of Nitrogen and Carbon Dioxide Solubility in Alternative Fuels at High Pressures Using the Soave‐Redlich‐Kwong Equation of State

“…Figs. 5±6 that the data for the ternary system containing carbon dioxide are not predicted as well as the nitrogen system. Similar conclusions were also found earlier [1] for calculations based on the MHV2 mixing rule with the use of the UNIFAC or UNIQUAC models for the description of the activity coefficient.…”

“…It is well known from the literature that this equation describes quite successfully very complex systems. Due to the polarity of the compounds involved in this study, the SRK EOS has been tested beforehand with the modified Huron-Vidal mixing rule of second order (MHV2) combined with modified UNIFAC or UNIQUAC models [1]. The data were predicted well for both the binary and ternary systems within the limits of error encountered in common activity coefficient models and within uncertainty of measured data.…”

“…Recently, new experimental vapor-liquid equilibrium (VLE) data have been measured at high pressures for the binary nitrogen + dimethyl ether and the ternary nitrogen + dimethyl ether + methanol and carbon dioxide + dimethyl ether + methanol systems [1]. Good experimental data at high pressures are also available in the literature for the binary nitrogen + methanol [2], carbon dioxide + methanol [3], carbon dioxide + dimethyl ether [4] and dimethyl ether + methanol [5] systems.…”

Modeling Phase Equilibria of Ethers and Alcohols with GCA-EOS for Assessing the Coblending of Advanced Biofuels

“…Phase equilibria of the DME + methanol binary mixture. (a) VLE at (◆) 293.15, (◇) 353.15, (×) 393.15, (■) 433.15, and (□) 453.15 K. ,, (b) PT projection of the critical locus . Symbols: experimental data, dashed and solid lines: correlation and prediction with the GCA-EOS, respectively, and dotted lines: pure component vapor pressure correlated with the GCA-EOS.…”

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.…”