Experimental determination and thermodynamic modeling of clathrate hydrate stability conditions in methane + hydrogen sulfide + water system

Experimental Measurements and Thermodynamic Modeling of CH4 + H2S + MEG Hydrate Phase-Equilibrium Conditions at 6.2–12.3 MPa

“…Experimental and predicted hydrate dissociation conditions for a binary mixture of the H 2 S + CH 4 + H 2 O system at different H 2 S concentrations: curves represent model and HydraFlash results: solid black curve: the proposed model predictions; dotted red curve: the HydraFlash predictions. Symbols represent experimental data: (□) pure CH 4 ; ( ○ ) 0.005 mole fraction H 2 S; (◇) 0.0311 mole fraction H 2 S; (▲) 0.044 mole fraction H 2 S; (△) 0.0715 mole fraction H 2 S; (●) 0.1151 mole fraction H 2 S; (■) pure H 2 S …”

“…Aghajanloo et al measured the hydrate equilibrium points of a binary gas mixture of CH 4 + H 2 S consisting of 0.005 mol fraction of H 2 S. They compared them with the results predicted by the thermodynamic model of PC-SAFT, CPA, and the commercial software HWHYD. The study showed that the PC-SAFT is relatively more precise than CPA for the binary system of CH 4 + H 2 S …”

“…26 Aghajanloo et al measured the hydrate equilibrium points of a binary gas mixture of CH 4 + H 2 S consisting of 0.005 mol fraction of H 2 S. They compared them with the results predicted by the thermodynamic model of PC-SAFT, CPA, and the commercial software HWHYD. The study showed that the PC-SAFT is relatively more precise than CPA for the binary system of CH 4 + H 2 S. 27 The application of thermodynamic inhibitors (e.g., alcohols and glycols), widely used in the oil and gas industry to avoid gas hydrate formation, 15 makes the modeling more complex. Many activity coefficient models are applied for alcohol and glycol systems, such as NRTL, UNIQUAC, and UNIFAC equations.…”