Table 1.
Thermal parameters and solubility in water of the salt forms obtained from water.
| Aliphatic base | Acronym |
B. p. (free base) (°C) | MW of the salt (anhydrous) | Tpeak of the salt melting (°C) |
ΔHm (Kcal.mol-1) | ΔS m(cal.mol-1·K-1) |
Solubility (mM) |
|
|---|---|---|---|---|---|---|---|---|
| 1 | Mono-ethanolamine | MEA | 169 | 357.23 | 101* | 2.6 | 7.0 | 26.5 |
| 2 | Di-ethanolamine | DEA | 269 | 401.29 | 130 | 6.8 | 16.8 | 45.0 |
| 3 | Tri-ethanolamine | TEA | 360 | 445.34 | 138 | 15.8 | 38.4 | 7.6 |
| 4 | Tris-methylol aminomethane | TRIS | 220 | 418.15 | 209 | 15.3 | 31.8 | 3.5 |
| 5 | Methyl-monoethanolamine | MeMEA | 156 | 372.15 | 78 | 1.1 | 3.1 | 25.4 |
| 6 | Dimethyl-monoethanolamine | diMeMEA | 135 | 385.29 | 111 | * | * | 54.4 |
| 7 | Ethyl-monoethanolamine | EtMEA | 170 | 385.29 | 97 | 2.7 | 7.3 | 33.8 |
| 8 | Diethyl-monoethanolamine | diEtMEA | 161 | 413.34 | 113 | 7.7 | 19.9 | 36.0 |
| 9 | Methyl-diethanolamine | MeDEA | 248 | 415.31 | 102 | 7.2 | 19.2 | 33.3 |
| 10 | Ethyl-diethanolamine | EtDEA | 246 | 430.15 | 76 | 6.6 | 18.9 | 25.2 |
* see Figure 9: the area surface of the first peak cannot be reliably obtained.