Salting‐out of acetone, 1‐butanol,and ethanol from dilute aqueous solutions |
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Authors: | Shaoqu Xie Conghua Yi Xueqing Qiu |
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Affiliation: | School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, P.R. China |
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Abstract: | The salting‐out phase equilibria for acetone, 1‐butanol, and ethanol (ABE) from dilute aqueous solutions using potassium carbonate (K2CO3) and dipotassium hydrogen phosphate trihydrate (K2HPO4?3H2O) 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 K2HPO4 solution (69 wt %) showed a stronger salting‐out effect than the K2CO3 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. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3470–3478, 2015 |
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Keywords: | salting‐out acetone + 1‐butanol + ethanol dilute aqueous solutions phase equilibria solubility correlation |
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