FORMATION OF HYDRATE FROM SINGLE-PHASE AQUEOUS SOLUTIONS
Experimental and theoretical research on the formation of hydrate from single-phase solutions of the hydrate former dissolved in water is described in this work. Two-phase equilibrium between carbon dioxide hydrate (H) and a water-rich liquid (L) are experimentally measured and theoretically described between 273 K and 280 K and at pressures to 60 MPa. Concentrations of carbon dioxide in the water phase ranging between 0.014 and 0.022 were studied. The theoretical and experimental results both indicate that the equilibrium pressure is very sensitive to concentration at all temperatures. These equilibria represent the solubility of carbon dioxide hydrate in a water phase and if a constant aqueous composition LH curve is extrapolated to the three-phase VLH curve, the composition characterizing the LH curve also represents the solubility of carbon dioxide in water at the VLH conditions. Since the solubility of carbon dioxide in water at hydrate- forming conditions is difficult to obtain, this method provides an excellent way of indirectly measuring this three-phase solubility.
Advisor:Robert Warzinski; Irving Wender; Robert Enick; Gerald Holder
School:University of Pittsburgh
School Location:USA - Pennsylvania
Source Type:Master's Thesis
Date of Publication:05/08/2003