The direct solubility of large amounts of Light Gas constituents in Water at and Near Hydrate Conditions

摘要

Experimental isobaric (constant pressure) solubility in an aqueous phase of common gas hydrate formers, i.e. methane, ethane, propane, and carbon dioxide are presented for temperatures near and at hydrate formation condition. It is noted that the measured isobaric solubilities in the vicinity of initial hydrate formation temperatures far exceed the values estimated by Henry's law, the frequently-applied conventional calculation procedure. The divergence of the experimental solubility from those predicted by Henry's law is also provided. The increase in the solubility is presumably the result of onset of a sorption process that traps gas molecules in the water structure. The pressures for methane, ethane, propane, and carbon dioxide are 34,6.5, 4.1, and 34 MPa or 500, 95, 60, and 500 psia, respectively. The temperatures being reported of solubility vary with the binary systems and normally cover a range from sub-ambient to slightly lower than the initial hydrate formation condition.