含水與正丙醇共沸物三成份液液相平衡

本研究主要要是在量測包含水與正丙醇共沸物的三成份液液相平衡數據，藉由三成份的液液相平衡的結果，企圖尋找適合分離水與正丙醇的共沸混合物之優良挾帶劑(萃提劑)。本實驗分別選取了乙酸異丁酯、乙酸異丙酯與2-丁醇作為挾帶劑，在室壓下分別於298.15 K、308.15 K、318.15 K三個溫度下，以雲點法完成了平衡曲線的製作，此外也利用氣相層析儀，完成了縛線的數據量測。實驗數據我們以Othmer-Tobias的縛線經驗式對照是否合理;在如何判斷挾帶劑能力，我們引用分離因子(S)處理的結果顯示，各挾帶劑的能力以乙酸異丁酯最優乙酸異丙酯次之，2-丁醇則效果不顯著，溫度效應對本研究量測的三組三成份液液相平衡行為影響不大。本研究所量測的縛線數據我們以UNIQUAC模式關連，由這些模式所得最佳化的參數值，可用來預測多成份系統的相平衡行為，來設計可行的分離程序，作為工業上設計共沸分離程序的參考資料。

關鍵字

液液平衡；挾帶劑；水溶液系統；共沸；正丙醇

並列摘要

In this research , we choose Iso-butyl acetate , Iso-propyl acetate and 2-butanol as entrainers . Meatrue ternary systems of phase behavior at 298.15 K, 308.15 K and 318.15 K. To find out the potential entrainers is what the subject of this project wants to do. In order to transform the aqueous azeotropic binary system to the separable ternary system at 760 mmHg. The ternary system of phase behavior (LLE) will be studied and measured in experiments. We check experimental data by Othmer-Tobias empirical equation. According to the experimental data show that Iso-butyl acetate is better than Iso-propyl acetate and 2-butanol. Especially, 2-Butanol is not a suitable entrainer.The tempture effect does not work much in these ternary systems. The experimental data will be correlated with the UNIQUAC model. The models with the determined model parameters will be apply to predict the phase behavior of multicomponent systems. Provide usable data to design separation process from the measurement of the multicomponent phase equilibrium system design behavior. The research could be the reference information for separation process in chemical engeenering.

並列關鍵字

Liquid-liquid equilibrium ； Entrainer ； Azeotrope ； Aqueous system ； UNIQUAC ； 1-propanol

參考文獻

[1] Han, S.J;Lin,H.M.;Chao,K.C.,”Vapor-Liquid Equilibrium of Molecular Fluid Mixtures by Equation of State”,Chem. Eng. Sci.,43, 1988,pp.2327-2367.

[2] Doherty, M.F. and G.A. Caldarola,”Design and Synthesis of Homogeneous Azeotropic Distillations. 3. The Sequencing of Columns for Azeotropic and Extractive Distillations”,Ind. Eng. Chem. Fundam,24,1985,pp.474-485.

[3] Laroche, L.; N. Bakiaris;H. W. Anderson and M. Morari,”The Curious Behavior of Homogenous Azeotropic Distillation Implications for entrainer Selection”,AIChE J.,38,1992,pp.1309-1328

[4] Young,S.,”The Preparation of Absolute Alcohol from Strong Spirit”,J. Chem. Soc.,81,1902,pp.707-717

[7] BehrensD.;Eckermann,R..,”Liquid-Liquid Equilibrium Data Collection”,

國際替代計量

含水與正丙醇共沸物三成份液液相平衡

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