本研究利用改良式之Othmer循環式汽液相平衡裝置量測等壓下（101.3 kPa）六組雙成份混合物之汽液相平衡數據，研究系統為：乙醇＋碳酸二乙酯、異丁醇＋碳酸二乙酯、正丁醇＋乙酸異丁酯、仲丁醇＋乙酸異丁酯、叔丁醇＋乙酸異丁酯與異丁醇＋乙酸異丁酯等系統。其中兩組系統（乙醇＋碳酸二乙酯與異丁醇＋乙酸異丁酯）用以驗證實驗量測系統與手法之可靠性，並以相同研究裝置及實驗技巧研究四組雙成份混合物之等壓（101.3 kPa）汽液相平衡實驗數據（異丁醇＋碳酸二乙酯、正丁醇＋乙酸異丁酯、仲丁醇＋乙酸異丁酯、叔丁醇＋乙酸異丁酯）。上述六組汽液相平衡實驗數據均須通過熱力學一致性的檢測，其中包含Herington提出的面積法與van Ness的點對點測試。本研究中，液相組成採用常見的活性係數模型（UNIQUAC、NRTL），並搭配汽相組成以計算逸壓係數的兩種方式（理想氣體和Hayden O’Connell（HOC））進行回歸。實驗結果顯示當系統含有碳酸二乙酯成份，以HOC的效果最佳；然而，當系統含有乙酸異丁酯成份，則以理想氣體的回歸表現較好。此外，對於雙成份混合物系統的預測，modified-UNIFAC與COSMO-SAC兩種模型在趨勢的走向上均能有相當不錯的表現。回歸的處理均在Aspen Plus可操作完成。;In this research, the isobaric vapor-liquid equilibrium (VLE) of six binary mixtures of ethanol + diethyl carbonate (DEC), 2-methyl-1-propanol + DEC, n-butanol + isobutyl acetate (IBAc), 2-butanol + IBAc, 2-methyl-2-propanol + IBAc and 2-methyl-1-propanol + IBAc were all measured at 101.3 kPa by using a recirculating type of modified Othmer equilibrium device. The newly measured isobaric VLE results of ethanol + DEC and 2-methyl-1-propanol + IBAc were compared to the experimental data from the open literatures in order to validate the employed experimental apparatus and measuring procedure. Then, the rest of the isobaric VLE of 2-methyl-1-propanol + DEC, n-butanol + IBAc, 2-butanol + IBAc and 2-methyl-2-propanol + IBAc at 101.3 kPa were investigated with the same apparatus and equal procedure because only very few or no available experimental data were found for each of these two binary mixtures system in open literatures. All measured data were tested by the thermodynamic consistency test methods proposed by Herington and van Ness. Binary interaction parameters for universal quasi-chemical (UNIQUAC) and non-random two liquid (NRTL) activity-coefficient models associating with the fugacity-coefficient method (ideal gas and Hayden O’Connell) were employed to correlate the measured VLE data. Furthermore, accuracy of the modified-UNIFAC model in predicting the six binary VLE of measured systems were do better agreement with our experimental data. All regression processes were do in Aspen Plus only.
