- 學位論文
水+正丁醇+乙酸正丁酯三成份混合溶劑系統之液液平衡的加鹽效應研究
Salt Effects on Liquid-Liquid Equilibria for Mixtures three solvent systems of Water, n-Butyl acetate, and n-Butanol.
摘要
本論文主要目的為三成份混合溶劑系統之液液平衡的鹽效應，為模擬鹽效應在混合溶劑系統之液液平衡，本研究利用TTK-Wilson活性係數模式來描述溶液中之非理想性。根據熱力學平衡準則，利用兩相中之每一成份活性必須相等，並配合質量均衡的觀念，來計算四成份電解質混合溶劑系統液液平衡組成。在所提出的計算方法中，不須要可調參數。在實驗方面，在25℃下，乙酸正丁酯和正丁醇和水系統在飽和EDTA鈉鹽或飽和EDTA鉀鹽的濃度下，進行平衡實驗量測。由實驗結果可以觀察到液液平衡相圖中兩相之不互溶區明顯地變大。在計算電解質混合系統之液液平衡時，可發現理論計算結果與實驗數據相當吻合，平均偏差小於0.8﹪。
並列摘要
The objective of this study is to investigate salt effects on liquid-liquid equilibria (LLE) of ternary mixed solvent systems.To simulate the salt effects on LLE of ternary mixed solvent systems, a TTK-Wilson activity coefficient model was used to represent the non-idealities in the solution.Based on thermodynamic equilibrium criterion that the activity of each component must be the same in two phases and the concept of mass balance, we can reproduce the LLE data of quaternary mixed-solvent electrolyte systems.No adjustable parameter was needed in the proposed calculation method.In the experimental part, the LLE measurements of n-butyl acetate－n-butanol－water systems saturated with EDTA-2Na (or EDTA-2K) were made at 25℃. It was observed that the salt effect enlarges the area of the two-phase region in the LLE phase diagram. It was found that the calculated results were in good agreement with experimental LLE data with a mean deviation less than 0.8﹪for each system.