posted on 2019-01-22, 13:34authored byXianglin Meng, Xiaowei Liu, Jun Gao, Dongmei Xu, Lianzheng Zhang, Yinglong Wang
For
separation of the azeotrope isobutyl acetate and isobutyl alcohol,
imidazolium-based ionic liquids 1-hexyl-3-methylimidazolium
hexafluorophosphate [Hmim][PF6] and 1-octyl-3-methylimidazolium
hexafluorophosphate [Omim][PF6] were applied as the
extractants in the extraction process. The liquid–liquid equilibrium
(LLE) data for the ternary systems isobutyl acetate + isobutyl alcohol
+ ([Hmim][PF6]/[Omim][PF6]) were determined
at temperature of 298.15 and 308.15 K. To evaluate extraction performance
of the ILs, the selectivity and distribution coefficient were calculated
from the experimental data. The effect of the alkyl chain length of
the cations and the temperature on the LLE for the systems were explored.
In addition, the experimental LLE data were correlated by the NRTL
model, and the binary interaction parameters of the NRTL model were
optimized.