Abstract
Liquid–liquid equilibria (LLE) and tie-line data of systems containing 1-butanol, water and NaCl, Na2SO4, NH4Cl or (NH4)2SO4 were investigated at 303.15, 313.15 and 323.15 K and atmospheric pressure. The salt decreases mutual solubilities of these two solvents leading to a higher degree of phase separation at equilibrium. The effect is more pronounced at high salt concentration. Temperature in the studied range had a minor effect on LLE behavior of these mixtures. Experimental data were correlated using a modified extended UNIQUAC model. Satisfactory agreement between the calculated and measured mass fractions of the components was achieved.
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Abbreviations
- a :
-
Binary interaction parameter
- G E :
-
Excess Gibbs energy
- K :
-
Partition coefficient
- M :
-
Number of tie lines
- N :
-
Number of components
- n :
-
Number of ions
- q :
-
Surface area parameter
- R :
-
Gas constant (J·mol−1· K−1)
- r :
-
Volume parameter
- T :
-
Temperature (K)
- w :
-
Mass fraction
- γ :
-
Activity coefficient for a component
- i,j,k :
-
Component i, j, k
- PDH:
-
Pitzer–Debye–Hückel term
- UNIQUAC:
-
UNIQUAC term
- Born:
-
Born term
- I:
-
Equilibrium aqueous phase
- II:
-
Equilibrium organic phase
- exp:
-
Experimental value
- calc:
-
Calculated value
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Chawong, K., Daengpradab, B. & Rattanaphanee, P. Liquid–Liquid Equilibrium of Water + 1-Butanol + Inorganic Salt Systems at 303.15, 313.15 and 323.15 K: Experiments and Correlation. J Solution Chem 46, 1077–1091 (2017). https://doi.org/10.1007/s10953-017-0619-6
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DOI: https://doi.org/10.1007/s10953-017-0619-6