本研究採用靜態式總壓法測量恆溫下環丁碸(sulfolane)或3-甲基環丁碸(3-methylsulfolane)與1,3,5-三甲基苯(1,3,5-trimethylbenzene)共兩組雙成分系統，以及環丁碸與正庚烷(n-heptane)、正辛烷(n-octane)、正壬烷(n-nonane)、甲基環戊烷(methylcyclopentane) 或甲基環戊烷(methylcyclohexane)，並以1,2,4-三甲基苯(1,2,4-trimethylbenzene)為第三成分，共五組三成分系統之汽液相平衡研究量測的溫度包含363.15 K、393.15 K、433.15 K以及473.15 K。本研究亦收集環丁碸與苯(benzene)、甲苯(toluene)、鄰二甲苯(o-xylene)、間二甲苯(m-xylene)、對二甲苯(p-xylene)或環己烷(cyclohexane)共六組雙成分混合物系統之恆溫或恆壓汽液相平衡公開文獻數據。本研究採用NRTL-ideal與NRTL-HOC模式關聯上列之汽液相平衡數據，並計算出13組雙成分或三成分系統之最適化參數值。

The total pressure method was used to measure the isothermal vapour-liquid equilibrium data for the binary systems of sulfolane or 3-methylsulfolane＋1,3,5-trimethylbenzene, and ternary systems of sulfolane＋1,2,4-trimethylbenzenen-heptane, n-octane, n-nonane, methylcyclopentane or methylcyclohexane at 363.15 K, 393.15K, 433.15 K, 473.15 K in this study. There is no azeotropic behavior in any system. Additionally, the VLE data of six binary systems of sulfolane＋ benzene, toluene, o-xylene, m-xylene, p-xylene or cyclohexane were collected from open literature. The NRTL-ideal and NRTL-HOC model was applied to correlate all the VLE data and determine the optimal values of model parameters for 13 binary or ternary systems.

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