Abstract
Phase transitions for (water+1-methylnaphthalene+light aromatic hydrocarbon) ternary systems are observed at their (liquid+liquid) equilibria at T=(563, 573, and 583)K and (8.6 to 25.0)MPa. The phase transition pressures at T=(563, 573, and 583)K were measured for the five species of light aromatic hydrocarbons, o-, m-, p-xylenes, ethylbenzene, and mesitylene. The measurements of the phase transition pressures were carried out by changing the feed mole fraction of water and 1-methylnaphthalene in water free, respectively. Effects of the feed mole fraction of water on the phase transition pressures are very small. Increasing the feed mole fraction of 1-methylnaphthalene results in decreasing the phase transition pressures at constant temperature. The slopes depending on the feed mole fraction for 1-methylnaphthalene at the phase transition pressures are decreased with increasing temperature for (water+1-methylnaphthalene+p-xylene), (water+1-methylnaphthalene+o-xylene), and (water+1-methylnaphthalene+mesitylene) systems. For xylene isomers, the highest and lowest of the phase transition pressures are obtained in the case of p- and o-xylenes, respectively. The phase transition pressures for ethylbenzene are lower than those in the case of p-xylene. The similar phase transition pressures are given for p-xylene and mesitylene.
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