Douglas G. Elliot

Solubility Measurements for CO2 and Methane Mixture in Water and Aqueous Electrolyte Solutions near Hydrate Conditions

The gas solubility of the CH 4 + CO 2 mixture in pure water, and electrolyte solutions containing NaCl and Na 2 SO 4 was measured in the temperature range of 280–292 K. Within the experimental accuracy, the experimentally measured gas solubility obeys the Henry’s law in the form of the Krichevsky-Kasarnovsky equation near (but above) hydrate formation temperature. The ternary solubility data can be predicted by the binary ones. It was found that the CO 2 solubility in the aqueous phase decreases in the presence of the electrolytes. Very accurate methane solubility data in the ternary system are required to identify the effects of electrolytes on solubility and selectivity.