Dataset for the new insights into methane hydrate inhibition with blends of vinyl lactam polymer and methanol, monoethylene glycol, or diethylene glycol as hybrid inhibitors

Three-phase equilibrium conditions of vapor-aqueous solution-gas hydrate coexistence for the systems of CH4- H2O-organic thermodynamic inhibitor (THI) were experi-mentally determined. Hydrate equilibrium measurements for systems with methanol (MeOH), monoethylene glycol (MEG), and diethylene glycol (DEG) were conducted. Five concentra-tions of each inhibitor (maximum content 50 mass%) were studied in the pressure range of 4.9-8.4 MPa. The equilib-rium temperature and pressure in the point of complete dissociation of methane hydrate during constant-rate heating combined with vigorous mixing of fluids (600 rpm) in a high-pressure vessel were determined. We compared our experimental points with reliable literature data. The coeffi-cients of empirical equations are derived, which accurately describe hydrate equilibrium conditions for the studied systems. The effect of THI concentration and pressure on

Automated summary

The three-phase equilibrium conditions of vapor-aqueous solution-gas hydrate coexistence for CH4-H2O-organic thermodynamic inhibitor (THI) systems were determined experimentally. Hydrate equilibrium measurements were conducted for systems with methanol (MeOH), monoethylene glycol (MEG), and diethylene glycol (DEG). The temperature and pressure at the point of complete dissociation of methane hydrate were determined through constant-rate heating and vigorous mixing in a high-pressure vessel. The coefficients of empirical equations accurately describe the hydrate equilibrium conditions for the studied systems, taking into account the effect of THI concentration and pressure.