Data of liquid–liquid equilibria (LLE) for water + 1,6-hexanediamine
+ 1-butanol and water + 1,6-hexanediamine + 1-pentanol ternary systems
were determined at T = 298.2, 308.2, and 318.2 K
under atmospheric pressure. The distribution coefficients and selectivity
factors calculated from LLE data were applied to evaluate the feasibility
and effectiveness of extracting 1,6-hexanediamine from the aqueous
solution. The results showed that the selectivity factors decrease
with the amount of 1,6-hexanediamine increasing in the aqueous phase,
and the effect of temperature is insignificant in this study. The
nonrandom two-liquid and universal quasichemical activity coefficient
models were also applied to regress the experimental equilibrium data
of the two ternary systems and the root mean square deviation values
between the correlated and experimental results were lower than 0.7%.
It turned out that these phase equilibrium behaviors can be described
by the two models. Meanwhile, the binary model parameters were acquired
from the relevant process simulations.
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