Related references
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Article
Multidisciplinary Sciences
Anton P. Semenov et al.
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.
Article
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Anton P. Semenov et al.
Summary: Gas hydrate inhibition is an important topic in flow assurance. The hybrid inhibition strategy involving kinetic hydrate inhibitors (KHIs) and thermodynamic hydrate inhibitors (THIs) has been developed through extensive experimental studies. Methane hydrate equilibrium conditions were determined for aqueous solutions of methanol, MEG, and DEG (<50 mass%). The kinetics of methane hydrate nucleation and growth were studied for aqueous solutions of commercial vinyl lactam KHI and its blends with alcohols. A blend of KHI and MEG is optimal for hybrid inhibition, showing enhanced delay of gas uptake and reduced rate of methane hydrate growth.
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M. B. Yarakhmedov et al.
Summary: This work shows that water-soluble compounds can either promote or inhibit hydrate formation depending on the thermobaric conditions. Alcohols like methanol, ethanol, and 2-propanol are commonly used as thermodynamic hydrate inhibitors, but this study found that even methanol does not inhibit hydrate formation below the ice crystallization line. Additionally, the presence of ice and liquid mixture accelerates hydrate growth compared to growth from the bulk phase of ice. These findings have implications for developing gas storage and gas mixture separation technologies based on hydrates.
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Anton P. Semenov et al.
Summary: This paper investigates the potential of dimethyl sulfoxide (DMSO) as an inhibitor of gas hydrates. Equilibrium conditions of CO2 hydrates were measured at different temperatures and DMSO concentrations, revealing that DMSO reduces the thermodynamic stability of CO2 hydrate and exhibits stronger inhibition activity in water solution compared to lower alcohols. The study also demonstrates the thermodynamic coherence of the new hydrate equilibrium data and identifies the presence of sI hydrate, crystalline ice Ih, and solid CO2 phases. Overall, DMSO can be considered an effective thermodynamic inhibitor for CO2 hydrate formation, surpassing the activity of alcohol THIs within a specific range.
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(2022)
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A. P. Semenov et al.
Summary: This study analyzed the factors influencing the determination of gas hydrates phase equilibria conditions using stepwise heating and constant-rate heating procedures. The results showed that using the GHA350 autoclave can provide more reliable results compared to the RCS6 rocking cells. The stepwise heating method is more reliable but time-consuming, while the constant-rate heating method can significantly reduce the measurement time. The choice of heating rate should be consistent with the mixing efficiency and other factors. For most systems, the results of both methods are consistent within the experimental error limits, except for gas hydrates in concentrated salt solutions with high viscosity at low temperatures.
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(2022)
Article
Engineering, Environmental
Anton P. Semenov et al.
Summary: The study demonstrates that DMSO is a thermodynamic hydrate inhibitor, with a linear correlation between its mass fraction in solution and gas pressure. Compared to methanol, DMSO exhibits more effective anti-hydrate activity due to the higher non-ideality of its aqueous solutions.
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