本研究使用半流動式相平衡量測裝置，量測四組由二氧化碳與dimethyl adipate、dimethly glutarate、dimethyl succinate及monomethyl adipate等四種溶質分別組合而成之雙成分系統的汽液相平衡數據，操作溫度在333.15 ~ 413.15 K之間，操作壓力最高至25 MPa。
在相同之操作條件下，實驗結果顯示溶質在二氧化碳中的溶解度大小依序為是dimethyl succinate ＞ dimethlyl glutarate ＞ dimethyl adipate ＞monomethyl adipate。雙酯類之溶解度隨分子量降低而升高。汽液相平衡數據以Krichevsky-Ilinskaya（KI）方程式關聯，並求出用於不同溫度狀況的亨利常數；亨利常數隨著溫度升高而增加。所量得的汽液相平衡數據也使用不同的三次狀態方程式及混合律關聯；經由泡點壓力計算，訂定最適合的交互作用參數值。計算結果顯使用兩參數凡得瓦爾之混合律之Peng-Robinson狀態方程式通常對含二元酯類之系統可獲得較佳的準確度；使用溫度相依之Patel-Teja狀態方程式則對於CO2 + monomethyl adipate 的系統有最佳的效果。

A semi-flow type apparatus was employed in this study to measure the vapor-liquid equilibrium (VLE) data for four binary systems of carbon dioxide with dimethyl adipate, dimethyl glutarate, dimethyl succinate, and monomethyl adipate at temperatures from 333.15 K to 413.15 K and pressured up to 25 MPa.
From experimental results, we found the solubilities of the solute in carbon dioxide to follow the sequence of dimethyl succinate > dimethyl glutarate > dimethyl adipate > monomethyl adipate at the same operating conditions, indicating showed that the solubility of the diesters increases with decreasing the molecular weight. The VLE data were correlated with the Krichevsky-Ilinskaya（KI）equation to determine Henry’s constants. The Henry’s constants were found to increase with increasing temperature for each system. Several cubic equations of state with various mixing rules were also applied to correlate these VLE data. The binary interaction constants were determined from the bubble point pressure calculation. The results showed that the Peng-Robinson equation of state with two-parameter van der Waals mixing rule generally gave better results for the diesters con- taining systems. However, the Patel-Teja equation of state with temperature-dependent mixing rule yielded the best results for CO2 + monomethyl adipate.

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