Liquid-Liquid Equilibrium of Aqueous Solutions in the Presence of Biological Buffer EPPS

• Main Authors: Han-Lan Teng, 鄧翰嵐
• Other Authors: Ming-Jer Lee
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/43086613360966517114

碩士 === 國立臺灣科技大學 === 化學工程系 === 99 === The objective of this study is to investigate the liquid-liquid phase equilibrium behavior of organic aqueous systems containing a biological buffer 3-[4-(2-hydroxyethyl)-1-piperazinyl]propanesulfonic acid (EPPS). The studied aqueous systems including one of following organic compounds：1-propanol, 2-propanol, tert-butanol, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, or acetonitrile. A new liquid phase was formed when we added certain amount of EPPS into the above mentioned aqueous solutions. The liquid-liquid equilibrium (LLE) and solid-liquid-liquid equilibrium (SLLE) data were measured for these ternary aqueous systems at 298.2 K under atmospheric pressure. The effective excluded volume (EEV) values of EPPS were obtained from the phase boundary data. The results of Othmer-Tobias illustrated that the LLE experimental data appear to be well-consistent. The experimental tie-lines data were correlated satisfactionly with the NRTL model. The buffering-out effect may be useful in the recovery of organic solvent from the aqueous solutions.