本研究利用半流動式汽液平衡量測裝置，量取二氧化碳與乙二醇醚類 (ethylene glycol monopropyl ether, diethylene glycol methyl ether, diethylene glycol dimethyl ether及diethylene glycol monoethyl ether) 四組雙成份系統的汽液相平衡數據，平衡溫度在333.15 K ~ 413.15 K之間，而壓力高至23 MPa或接近混合物之臨界壓力。相同溫度和壓力下，乙二醇醚醇類在二氧化碳中之飽和溶解度依序為ethylene glycol monopropyl ether ＞ diethylene glycol dimethyl ether＞ diethylene glycol methyl ether ＞ diethylene glycol monoethyl ether。
重質成份在二氧化碳中之溶解度，可用二氧化碳的密度準確關聯；所量得的汽液平衡數據，可利用Krichevsky-Ilinskaya (KI) 方程式關聯，並求取亨利常數。各系統之亨利常數隨溫度昇高而增大。這些相平衡數據也被用來測試不同的體積三次方型狀態方程式及混合律，用於本實驗所量測之混合物系統汽液平衡計算的合適性。本研究分別利用泡點壓力計算及驟沸計算來訂定交互作用參數，計算結果顯示泡點壓力計算使用雙交互作用參數之凡得瓦爾單一流體混合律 (Q2)，一般而言，可獲得較佳的結果;驟沸計算則是Mathias-Klotz-Prausnitz混合律 (MKP) 可獲得較佳的結果。

A semi-flow type apparatus was employed in this study to measure the vapor-liquid equilibrium (VLE) data for four binary systems composed of carbon dioxide with one of following glycol ethers : ethylene glycol monopropyl ether, diethylene glycol methyl ether, diethylene glycol dimethyl ether, and diethylene glycol monoethyl ether at temperatures from 333.15 K to 413.15 K and pressures up to 23 MPa or near the critical pressure of the mixtures. At a given condition, solubilities of the glycol ethers in carbon dioxide follow the sequence of ethylene glycol monopropyl ether ＞ diethylene glycol dimethyl ether＞ diethylene glycol methyl ether ＞ diethylene glycol monoethyl ether.
An empirical equation correlated well the saturated vapor composition of the heavy components in terms of the density of carbon dioxide. The VLE data were utilized to determine Henry’s constants with the Krichevsky – Ilinskaya（KI）equation. It was found that the Henry’s constant increased with increasing temperature for each system. The VLE data were also used to test the validity of several cubic equations of state with various mixing rules for VLE calculations of the investigated mixtures. The binary interaction constants were determined from both the bubble point pressure calculation and the flash calculation. It showed that the two-parameter van der Waals one-fluid mixing rule (Q2) generally yielded better results from the bubble point pressure calculation and the Mathias-Klotz-Prausnitz mixing rule (MKP) was preferable from the flash calculation.

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