Salting‐out of acetone, 1‐butanol, and ethanol from dilute aqueous solutions

Abstract

The salting-out phase equilibria for acetone, 1-butanol, and ethanol (ABE) from dilute aqueous solutions using potassium carbonate (K 2 CO 3 ) and dipotassium hydrogen phosphate trihydrate (K 2 HPO 4 Á3H 2 O) as outstanding salting-out agents were investigated. Increasing the salt concentration strengthened the salting-out effects and improved the distribution coefficients of all three solvents (ABE) significantly. Temperature had a slight effect on the phase equilibria. The K 2 HPO 4 solution (69 wt %) showed a stronger salting-out effect than the K 2 CO 3 solution (56 wt %) on recovering ABE from dilute aqueous solutions. Dilute aqueous solutions containing more solvents increased the recoveries of acetone and 1-butanol, while the results showed a negligible effect on the solubility of ABE. The solubility of ABE was also correlated well with the molar number of salt per gram of water in the aqueous phase. A new equation demonstrated this satisfactorily.

Salting‐out of bio‐based 2,3‐butanediol from aqueous solutions

“…22 It was verified that K 2 HPO 4 was an outstanding salting-out agent for the recovery of acetone, 1-butanol, and ethanol from dilute aqueous solutions. 23 Thus, K 2 CO 3 , K 2 HPO 4 , and K 3 PO 4 were selected in our study, and K 4 P 2 O 7 was also selected. 24 In this work, the feasibility of employing a salting-out technique to recover 2,3-BD from various aqueous solutions was investigated.…”

Salts and 1‐propanol induced aqueous two‐phase systems: phase separation and application

“…The highly efficient phase‐splitting pattern was ascribed to the relatively weaker hydrophilia of 1‐propanol and the stronger salting‐out effect of the selected electrolytes . Thus, the most important factors effecting the application of the systems (lower contents of water and salt in the organic phase and lower content of extractant in the aqueous phase) were achieved in our study.…”

“…In an initial screening of the salting‐out agents, high‐solubility inorganic electrolytes including K 2 CO 3 , K 2 HPO 4 , K 3 PO 4 and K 4 P 2 O 7 were tested for the separation of 1‐propanol from the aqueous solution by creating liquid–liquid equilibria at 298.15 K. In general, the salting‐out effect of an electrolyte on the solute is influenced most by the salt composition, the initial salt concentration and the solute species, and less so by the solute concentration and temperature slightly . Thus, the experimentally measured LLE data of the four [water + 1‐propanol + salt] ternary systems studied in this work are given in Tables .…”

“…The salting‐out systems were shaken (400 rpm) for 1 h at room temperature and then allowed to settle for a further 24 h at 25 °C. The temperature was controlled in a water bath and measured by a standard glass‐mercury thermometer …”

“…The amount of the potassium salt in the organic phase was determined by using frame atomic absorption spectrometry (FAAS) (Shimadzu). A certain amount of the organic phase was pretreated with nitric acid and cesium nitrate where nitric acid was used to prevent atomic association and cesium nitrate was used as an ionization buffer . The FAAS measurements were carried out at the wavelength of 766.5 nm .…”