Table 2.
Characteristics of the two-phase aqueous system of choline chloride − urea + dipotassium hydrogen phosphate + water.
| Feed number | Feed composition (percentage by weight) | Composition of the upper phase (percentage by weight) | Lower phase composition (weight percent) | STL | TLL | |||
|---|---|---|---|---|---|---|---|---|
| DES | K2HPO4 | DES | K2HPO4 | DES | K2HPO4 | |||
| 1 | 30 ± 1 | 30 ± 2 | 40.76 ± 0.5 | 20.47 ± 2 | 14.51 ± 0.6 | 43.72 ± 0.8 | − 0.86 ± 0.03 | 35.07 ± 0.4 |
| 2 | 32 ± 0.5 | 30 ± 1 | 45.46 ± 0.7 | 17.64 ± 1 | 10.94 ± 0.4 | 49.33 ± 1 | − 0.92 ± 0.01 | 46.86 ± 0.5 |
| 3 | 25 ± 0.8 | 35 ± 0.5 | 42.97 ± 0.9 | 19.11 ± 0.6 | 13.51 ± 0.7 | 45.16 ± 0.5 | − 0.88 ± 0.05 | 39.32 ± 1 |
| 4 | 25 ± 1 | 37 ± 1 | 48.45 ± 1 | 15.97 ± 1 | 13.62 ± 1 | 49.89 ± 2 | − 0.9 ± 0.02 | 50.83 ± 0.7 |