Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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When the potassium fluoride or potassium carbonate was added to the tert - butanol - water system, the water - enriched phase and the t - butanol - rich phase were produced. The results showed that when the concentration of potassium fluoride or potassium carbonate in the aqueous phase was higher, the t-butanol-rich phase produced in the aqueous phase contained negligible salt and water enriched. In the phase, the tert-butanol is negligible, so the tert-butanol-water system can be successfully separated with potassium fluoride or potassium carbonate. The Pitzer equation is used to calculate the activity of water in the water-rich phase and calculated using the Wilson, NRTL or UNIQUAC equation. The results show that the calculated values are in good agreement with the experimental data.