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Salting‐out of acetone, 1‐butanol, and ethanol from dilute aqueous solutions
Author(s) -
Xie Shaoqu,
Yi Conghua,
Qiu Xueqing
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14872
Subject(s) - chemistry , acetone , salting out , aqueous solution , solubility , butanol , salt (chemistry) , ethanol , inorganic chemistry , organic chemistry
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 ⋅3H 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. © 2015 American Institute of Chemical Engineers AIChE J , 61: 3470–3478, 2015