Table 5
Hydrate equilibrium temperatures at HLw as function of CO2 concentration (xCO2) in distilled water and saline systems (CO2 concentration is on free-salt basis and mole fraction).
| Aqueous composition | T (K) | P (MPa) | Wt% CO2 | xCO2 × 102 |
|---|---|---|---|---|
| Distilled water | 274.05 | 9.51 | 4 | 1.677 |
| 274.25 | 17.75 | 4 | 1.677 | |
| 275.75 | 10.23 | 4.4 | 1.849 | |
| 275.95 | 21.11 | 4.4 | 1.849 | |
| 278.15 | 8.34 | 5 | 2.109 | |
| 278.35 | 11.2 | 5 | 2.109 | |
| 278.55 | 19.17 | 5 | 2.109 | |
| 279.25 | 10.24 | 5.5 | 2.327 | |
| 279.45 | 20.34 | 5.5 | 2.327 | |
| 280.05 | 9.75 | 6 | 2.546 | |
| 280.35 | 15.45 | 6 | 2.546 | |
| 3 wt% NaCl | 271.45 | 10.47 | 3 | 1.250 |
| 271.65 | 21.79 | 3 | 1.250 | |
| 277.15 | 11.28 | 4 | 1.677 | |
| 277.25 | 18.2 | 4 | 1.677 | |
| 277.95 | 10.96 | 5 | 2.109 | |
| 278.15 | 19.31 | 5 | 2.109 | |
| 279.35 | 9.35 | 6 | 2.546 | |
| 279.65 | 17.15 | 6 | 2.546 | |
| 6 wt% NaCl | 277.15 | 8.41 | 5 | 2.109 |
| 277.55 | 15.61 | 5 | 2.109 | |
| 3 wt% NaCl + 0.6 wt% CaCl2 | 275.65 | 9.56 | 4 | 1.677 |
| 275.85 | 20.41 | 4 | 1.677 | |
| 278.85 | 10.36 | 5 | 2.109 | |
| 278.95 | 13.51 | 5 | 2.109 | |
| 280.55 | 10.58 | 6 | 2.546 | |
| 280.75 | 14.38 | 6 | 2.546 |
Expanded uncertainties (k = 2): u(T) = 0.7 K, u(P) = 0.13 MPa, u(xCO2 × 102) = 0.04. See Appendix.
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