本研究採用合成法，以一可變體積附視窗暨影像處理系統的高壓相平衡分析裝置量取恆溫下之汽液相平衡數據，量測系統包含二氧化
碳與3-acetylpyridine，acetophenone，N,N-dimethylformamide, N,N-diisopropylethylamine-propanoate [DIPEA][C2COO]或N,N-diisopropylethylamine-butanoate [DIPEA][C3COO] 兩種不同陰離子之離子液體，量測溫度介於303.2 K~348.2 K之間，而操作壓力高至31.07 MPa。此外，這些相邊界數據以Peng-Robinson狀態方程式，結合單交互作用參數之凡得瓦爾單一流體混合律或Wong-Sandler混合律關聯，訂定最適化雙成分交互作用參數值。根據實驗結果二氧化碳與3-acetylpyridine，acetophenone，N,N-dimethylformamide等三個系統在臨界區域附近各成分K值隨壓力之變化分別以圖形表示。由於在臨界區附近之相關文獻極為有限，這些相平衡數據對於增進吾人對臨界區域附近相行為之知識有其必要性。
另外本研究也觀察多成分系統恆溫下之相邊界性質，所探討的系統包括二氧化碳與緩衝溶4-(2-hydroxyethyl)-1-piperazinepropanesulfonic- acid (EPPS) 在有或無乙醇情況下的水溶液系統、二氧化碳與緩衝溶液N,N-bis(2-hydroxyethyl)glycine (Bicine)之水溶液系統、甲烷與緩衝溶液HEPES-Na或tert-butanol之水溶液系統，溫度範圍為275.2 K~348.2 K，而壓力高達14.72 MPa。原始的Peng-Robinson狀態方程式結合Wong-Sandler混合律與修正吸引力項Mathias-Copeman alpha function (PRWS-MC) 之模式用於關聯這些多成分系統之相邊界數據。關聯結果顯示，汽液相平衡數據可準確關聯，然而無法用於描述系統中之液液分相的行為。同時對於含有乙醇系統的泡點曲線數據，Peng-Robinson狀態方程式關聯結果顯示有相對較大之誤差。在考量二氧化碳與緩衝溶液EPPS之水溶液系統中之化學作用效應的情況下，本研究也採用Kent-Eisenberg模式描述其汽液相平衡性質，該模式可關聯二氧化碳之分壓與二氧化碳吸收量，其平均絕對誤差分別為1.7%與9.5%。除此之外，本研究也探討在常壓下利用EPPS與Bicine之水溶液捕捉並封存二氧化碳以便與高壓操作的結果作比較。我們將透過上述提及之高壓相平衡分析裝置捕捉飽和二氧化碳水溶液，與在常壓下捕捉之飽和二氧化碳水溶液之兩種方法，分別在常壓下與氯化鈣鹽類反應，並且成功地將其轉變成碳酸鹽類。本研究之結果提供了很重要的新相平衡數據，這些資料有助於尋求二氧化碳捕捉與封存操作之合適條件。

A synthetic method with a visual and volume-variable high-pressure phase equilibrium analyzer (PEA) was employed for determining the phase boundaries over a wide pressure and temperature ranges. The isothermal phase boundaries were measured for CO2 + 3-acetylpyridine, CO2 + acetophenone, CO2 + N,N-dimethylformamide, CO2 + ionic liquids N,N-diisopropylethylamine-propanoate [DIPEA][C2COO] or N,N-diisopropylethylamine-butanoate [DIPEA][C3COO] at temperatures from 303.2 K to 348.2 K and pressures up to 31.07 MPa. The phase boundaries were correlated with Peng-Robinson (PR) equation of state (EoS) together with the van der Waals one fluid or the Wong-Sandler mixing rules to determine optimal values of binary interaction parameters. According to experimental results, the isothermal K-values varying with pressure were presented graphically around the critical points for CO2 + 3-acetylpyridine, CO2 + acetophenone and CO2 + N,N-dimethylformamide systems. Since available information in near critical regions is limited, these phase equilibrium data are needed for improving the knowledge of phase behavior near critical region.
In this study, the isothermal of multicomponent phase boundaries were also observed for several multicomponent systems, including CO2 + buffer 4-(2-hydroxyethyl)-1-piperazinepropanesulfonic acid (EPPS) with or without ethanol, CO2 + buffer N,N-bis(2-hydroxyethyl)glycine (Bicine) aqueous solutions, CH4 + HEPES-Na and CH4 + tert-butanol at temperatures from 275.2 K to 348.2 K and pressures up to 14.72 MPa. The PR EoS incorporating with the Wong-Sandler mixing rule and the Mathias-Copeman alpha function (PRWS-MC) was used to correlated the phase boundaries of multicomponent systems. The VLE data can satisfactorily correlated but fail to represent the behavior of liquid-liquid phase splitting. Relative large deviations were also found when we applied the Peng-Robinson equation to correlate the bubble point data of ethanol-containing system. In the present study, the chemical interactions are also considered for CO2 + EPPS aqueous solution to represent the VLE data by applying the Kent-Eisenberg model with partial pressure of carbon dioxide and carbon dioxide loading to the AARD of 1.7% and 9.5%, respectively. Moreover, sequestration carbon dioxide with aqueous EPPS and Bicine solutions were also investigated at atmospheric pressure for comparison purpose. The saturated carbon dioxide aqueous solutions, prepared at elevated and atmospheric pressures, were further reacted with calcium chloride at ambient condition. The absorbed carbon dioxide was successfully converted into carbonate. The results of this study are important to provide new phase equilibria data and be useful to find the suitable operating conditions for carbon dioxide capture and storage.

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