Modification of the extended uniquac model for correlating quaternary liquid—liquid equilibrium data

Quaternary (liquid + liquid) equilibria for (water + ethanol + toluene + 1,1-dimethylethyl methyl ether or 1,1-dimethylpropyl methyl ether) at the temperature 298.15 K

“…(9,10) For the ternary mixtures having a plait point, original UNIQUAC model predicts generally larger solubility envelope than the experimental one. Good quantitative description of the ternary (liquid + liquid) equilibrium mixtures usually need ternary parameters in addition to the binary parameters.…”

“…(23) Values of pure component molecular size and area parameters r and q for MTBE and TAME were taken from the literature, (3) and the others were taken from Prausnitz et al (21) The values of q used in the modified UNIQUAC and extended UNIQUAC models, fixed to obtain a good representation for binary and ternary phase equilibria studied previously, were obtainable from the references. (9,10) The q used in the modified UNIQUAC model was q 0.75 for MTBE and TAME, 0.74 for water, and 0.50 for ethanol. The q used in the extended UNIQUAC model was q 0.20 for MTBE and TAME, 0.96 for water, and 0.92 for ethanol.…”

“…(7,8) In this work, we present (liquid + liquid) equilibria for two quaternary mixtures of (water + ethanol + toluene + MTBE, or TAME) measured at T = 298.15 K. The measured results are correlated with modified UNIQUAC and extended UNIQUAC models having binary, ternary, and quaternary parameters. (9,10) The binary and ternary parameters constituting the quaternary mixtures are obtained from binary and ternary phase equilibria whose experimental values are available from the following literatures: (vapour + liquid) a To whom correspondence should be addressed (E-mail: tamura@t.kanazawa-u.ac.jp).…”

(Liquid+liquid) equilibria for (methanol+aniline or acetonitrile+cyclohexane+heptane) at the temperature 298.15 K

“…Pure-component molecular-size and molecular-area parameters r and q, were taken from reference 23 and q'=q 0.2 for acetonitrile, aniline, cyclohexane, and heptane, and q'=1.00 for methanol. (6,12) Table 3 gives the molar binary parameters of the extended UNIQUAC model along with the r.m.s. deviations between the experimental and most probable calculated values of the measured variables: dp for pressure; dT for temperature; dx for liquid mole fraction; and dy for vapour mole fraction.…”

“…(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) This paper reports results for (acetonitrile + cyclohexane + heptane), (methanol + aniline + cyclohexane + heptane), and (methanol + acetonitrile + cyclohexane + heptane), measured at the temperature T = 298.15 K. The experimental results are correlated with the two activity-coefficient models: extended UNIQUAC and modified Wilson. (12,13) Phase-equilibrium results for the binary and (14) (acetonitrile + methanol) at T = 328.15 K; (15) (cyclohexane + heptane) T = 298.15 K; (16) mutual solubilities at T = 298.15 K: (methanol + cyclohexane); (17) (methanol + heptane); (18) (aniline + cyclohexane); (19) (aniline + heptane); (19) (acetonitrile + cyclohexane); (20) and (acetonitrile + heptane); (5) and ternary tie-line results at T = 298.15 K: (methanol + aniline + heptane); (19) (methanol + aniline + cyclohexane); (19) (aniline + cyclohexane + heptane); (21) (methanol + cyclohexane + heptane); (6) (methanol + acetonitrile + cyclohexane); (17) and (methanol+acetonitrile+heptane).…”