Salting-out separation and liquid-liquid equilibrium of tertiary butanol aqueous solution

The separation of tertiary butanol (TB) from aqueous solution was studied b y salting-out effect for practical application. The final concentration of alcohol can be concentrated into 96% from its original 60%. More than 20 sa lts were experimented upon to compare their salting-out capacities. Accordi ng to the concentration target, potassium fluoride (KF) was chosen as a sal ting-out agent for TB aqueous solution. The liquid-liquid equilibrium data of TB-H2O-KF system and the relationship between the amount of KF and the c oncentration of TB at different temperatures have been measured and reporte d. The method of salt addition has been optimized by experiments. KF liquor can be used as salting-out agent. A mathematical model was set up by Pitze r theory and Wilson equation. The Wilson parameters and the Pitzer paramete rs were obtained by regression. (C) 2000 Elsevier Science S.A. All rights r eserved.