| Summary: | 碩士 === 靜宜大學 === 應用化學系 === 99 === This study measures the liquid-liquid equilibria (LLE) for one quaternary system [water + methanol + (n-heptane 50 mol% + toluene 50 mol%)] and three quinary systems [water + (methanol 75 mol% + dimethyl carbonate 25 mol%) + (n-heptane 50 mol% + toluene 50mol%), water + (methanol 50 mol% + dimethyl carbonate 50 mol%) + (n-heptane 50 mol% + toluene 50 mol%), and water + (methanol 25 mol% + dimethyl carbonate 75 mol%) + (n-heptane 50 mol% + toluene 50 mol%)]. The experiments were conducted at 298.15 K and 313.15 K under atmospheric pressure. The reliability of the experimental tie-line data was confirmed using the Othmer-Tobias equation. The experimental tie-lines data were correlated with the NRTL and the UNIQUAC models obtaining a well reproducibility of the experimental phase equilibrium behavior. The densities, viscosities, refractive indexes, and surface tensions of each conjugated phase located in the isothermal binodal curve have been determined for the multicomponent systems. It is observed that these data of each conjugate phase are valuable references for the degree of mutual solubility of the multicomponent systems.
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