Table 10.
Some of the physical properties of DESs (binary mixtures) used in the work at 298.15 K and pressure (p = 871 hPa).
| Molar ratio | Melting Point (K) | Water content (w%) | Molar mass (g mol-1)a | T / K | ρ / g cm-3 (Exp) | ρ / g cm-3 (Lit) | u / m s-1 (Exp) | u / m s-1 (Lit) | |
|---|---|---|---|---|---|---|---|---|---|
| ChCl:EG | 1:2 | 207.1530 | < 0.01% | 87.921 | 298.15 | 1.115551 | 1.11561631 | 1909.20 | 1909.6531 |
| 1.13832 | 1911.0430 | ||||||||
| 1905.133 | |||||||||
| 303.15 | 1.112750 | 1.11271531 | 1897.43 | 1897.4831 | |||||
| 1894.033 | |||||||||
| 1885.63 | 191432 | ||||||||
| 308.15 | 1.109927 | 1.10992731 | 1886.0831 | ||||||
| 1882.833 | |||||||||
| 313.15 | 1.107151 | 1.108434 | 1873.86 | 188232 | |||||
| 1.105735 | 1871.833 | ||||||||
| 318.15 | 1.104361 | 1.1052936 | 1861.58 | 1860.733 | |||||
| ChCl:Gly | 1:2 | 233.1530 | 0.06% | 107.937 | 298.15 | 1.186358 | 1.192037 | 2012.42 | 2012.5930 |
| 1.1908538 | |||||||||
| 1.18132 | |||||||||
| 1.1957539 | 2001.2939 | ||||||||
| 303.15 | 1.183556 | 1.189537 | 2001.05 | 208032 | |||||
| 1.1880738 | |||||||||
| 1.1929039 | 1990.2339 | ||||||||
| 308.15 | 1.180849 | 1.186737 | 1989.90 | ||||||
| 1.1852838 | |||||||||
| 1.1901539 | 1979.2439 | ||||||||
| 313.15 | 1.178128 | 1.183837 | 1978.98 | 197632 | |||||
| 1.1824938 | |||||||||
| 1.1874039 | 1968.3039 | ||||||||
| 318.15 | 1.175437 | 1.181437 | 1967.90 | ||||||
| 1.1797038 | |||||||||
| 1.1846539 | 1957.3839 |
Standard uncertainties (u) for each variable are u (T) = 0.001 K; u (p) = 10 hPa.
The combined standard uncertainty for the average of n density measurements u (ρ) = 0.015 kg m-3 and speed of sound u (u) = 1 m s-1.
Standard uncertainty (u) for DESs composition was estimated to be less than 5·10–2 mol ratio.
a Molar mass of DESs = x1 M1 + x2 M2.
x1 and M1; mole fraction and molar mass of ChCl.
x2 and M2; mole fraction and molar mass of HBD.
The melting point is expressed for the solidus (formation of the first liquid) or liquids (disappearance of last crystals).
The density and speed of sound were measured for the liquid state of the prepared DESs.