Phase Stability and Kinetics of CH4 + CO2 + N2 Hydrates in Synthetic Seawater and Aqueous Electrolyte Solutions of NaCl and CaCl2

The hydrate formation and disociation in aqueous electrolyte (NaCl and CaCl2) solution of different concentrations and in synthetic seawater with CH4 + CO2 + N-2, mixture have been studied. Experiments Were performed in saltwater of 2 % (w/v) and 3 % (w/v) NaCl and CaCl2 and in synthetic seawater with salinity 3.27 % (w/v); 3.40 % (w/v), and 3.66 % (w/v). Phase-equilibrium conditions for multicomponent hydrocarbon-saline water mixture have been determined experimentally. Both the electrolyte, i.e.; NaCl and CaCl2 significantly inhibited the formation Of hydrate. It has also been noticed that the increase in salinity shifts the phase equilibrium curve more toward the inhibited zone. The phase equilibrium of hydrate in synthetic seawater has also been investigated, and the enthalpy of dissociation of hydrates has been calculated using the Clausius-Clapeyron equation. The kinetics of hydrate formation have also been studied to measure the induction time and hydrate formation rate. Further the amount of gas consumes by water to form hydrate has been calculated using the real gas equation.