碳酸二乙酯是種工業上常用到的有機溶劑，如在紡織染料業上可用來作為合成樹酯、硝化纖維素的溶劑，也可作為燃料的添加劑來降低汙染物的排放量，同時因為它本身的電化學穩定性、介電常數、解離能力、低蒸氣壓等特性，因此常與鏈狀、環狀碳酸酯類一起作為鋰電池電解液的添加物。因此如果能更精準量測出它的物質性質如汽液平衡數據等，不只能有效提高程序設計上的效能，也可作為預測模型參數修正的參考。
在本研究中，架設一套用來量測常壓汽液相平衡的裝置且藉由碳酸二乙酯與乙醇的系統作為檢驗，隨後將分別量測在常壓下碳酸二乙酯與 2-丁醇、新丁醇的汽液平衡相圖。所有的量測數據將會以熱力學一致性進行檢驗，並且與 UNIQUAC、NRTL、COSMO-SAC、UNIFAC 等計算結果做比較。

Diethyl carbonate (DEC) is widely used as a solvent in natural resin synthesizing and in textile dyeing, as a fuel additive to reduce the emission of carbon dioxide, and as a solvent for electrolytic solution in the capacitor and lithium battery, because of its electrochemical stability,
permittivity, dissociation capability, lower vapor pressure, and good solubility in gasoline. The vapor pressure of diethyl carbonate and the vapor-liquid equilibrium (VLE) of its mixtures are important information for all these applications.
In this work, an apparatus is set up to measure isobaric VLE at atmospheric pressure and validated by studying the binary mixture of DEC + ethanol. Then, we will conduct a systematic study on binary VLE of DEC + 2-butanol, 2-methyl-2-propanol at atmospheric pressure. All
these measuring data will be checked with the thermodynamic consistency test. Furthermore, the measured results will compare with calculated results from predictive thermodynamic models (COSMO-SAC and UNIFAC) and correlative thermodynamic models (UNIQUAC and NRTL) with binary interaction parameters obtained from regression of newly measured experimental data.

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