The Phenomenon of Salting Out and Reduces the Effect that Dissolves Each Other Among Solvents

• Main Authors: Shu - Ya Yen, 顏書亞
• Other Authors: 段葉芳
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/dh822q

碩士 === 國立臺北科技大學 === 化學工程所 === 94 === In chemical industry, separation processing is usually considered as a useful technology for the optimal design of unit operation and processing. Adding diverse electrolytes (salts) with different amounts can separate the mixture, n-Butyl Acetate－n-Butanol－water, in esterification through salting analysis processing. The ester type of products with a higher purity can be produced or designated for further purification processing. This research is consisted of experimental and theoretical investigations. In the experimental part, the salting analysis processing in a mixture of n-Butyl Acetate－n-Butanol－water under temperature 25℃ is individually performed with two salts, sodium phosphate and sodium phosphate dibasic.The equilibrium charts of liquid-liquid phase analyzed from the experimental results show that an extending non-dissolution area for two solvents is obviously found after adding salts.The results also reflect the same trend occurring at a decreasing solubility for both n-Butyl Acetate－water and n-Butanol－water. The effect of salting analysis processing deceases in the order of sodium phosphate and sodium phosphate dibasic. To simulate the liquid-liquid phase equilibrium in mixing solvents, the TTK - Wilson activity coefficient model is adopted to describe the deviation between the ideal solvent and the solvent in our research. By computing the liquid-liquid phase equilibrium of electrolytes in mixing solvents, the experimental results show a high degree of consistence, an average deviation of less than 0.8%, with theoretical prediction.