Vapor-liquid equilibrium in the system dimethyl ether/methanol from 0 to 180.degree.C and at pressures to 6.7 MPa

Abstract

Isothermal vapor-liquid equilibrium data have been measured tor the dimethyl ether/methanol system at 10 temperatures from 0.00 to 180.00 °C, and at pressures to 6.7 MPa, by a vapor-recirculating method. Barker's method of data reduction has been used to test the thermodynamic consistency of Isotherms below the critical temperature of dimethyl ether (128.8 °C). The results of the experiments have been compared with predictions of two cubic equations of state, the RedHch-Kwong and Peng-Robinson equations. With Interaction parameters calculated by fitting the Isotherm at 100 °C, these equations predict the liquid-and vapor-phase compositions to within about 3 mol % over most of the experimental range.

Henry’s law constants and infinite dilution activity coefficients of cis-2-butene, dimethylether, chloroethane, and 1,1-difluoroethane in methanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol, tert-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, and 2-methyl-2-butanol

“…The VLE for (cis-2-butene + 1-propanol) was also measured with the same method at T = 332 K [10]. The VLE for (dimethylether + methanol) was measured from T = (273.15 to 453.15) K [11] and from T = (254 to 352) K [12]. HenryÕs law constants of 1,1-difluoroethane in methanol and 2-propanol were measured by means of a flow method [13].…”

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.…”

Prediction of the binary parameters of a cubic equation of state from a group-contribution method

“…Let q k = ak/b&T; a solution corresponding to a stable liquid phase exists if (21) and its value is Maher and Smith, 1980Hirata et al, 1975Hirata et al, 1975Gmehling and Onken, 1977Knapp et al, 1982Gmehling and Onken, 1977Gmeling and Onken, 1977Chang et al, 1982Gmehling and Onken, 1977Gmehling and Onken, 1977Gmehling and Onken, 1977Hirata et al, 1975Knapp et al, 1982Scheller et al, 1973Maher and Smith, 1980Hirata et al, 1975Gmehling and Onken, 1977McGlashan and Williamson, 1976Reamer et al, 1952 In a binary mixture, one has, from the quadratic mixing rules, and finally, the expression for the activity coefficient of component 1 is…”