Dataset on investigating nucleation and growth kinetics of methane hydrate in aqueous methanol solutions.

This work systematically investigates the effect of methanol (MeOH) in a wide range of concentrations (0, 1, 2.5, 5, 10, 20, 30, 40, and 50 mass%) on methane hydrate nucleation and growth kinetics. Multiple measurements of gas hydrate onset temperatures and pressures for CH-HO and CH-MeOH-HO systems were performed by ramp cooling experiments (1 K/h) using sapphire rocking cell RCS6 apparatus.

Data on searching for synergy between alcohol and salt to produce more potent and environmentally benign gas hydrate inhibitors.

In order to systematically study the synergistic effect of gas hydrate inhibition with mixtures of methanol (MeOH) and magnesium chloride (MgCl), the impact of these compounds on the thermodynamic stability of methane hydrate in the systems of CH-MeOH-HO, CH-MgCl-HO, and CH-MeOH-MgCl-HO was experimentally investigated. The pressure and temperature conditions of the three-phase vapor-aqueous solution-gas hydrate equilibrium were determined for these systems. The resulting dataset has 164 equilibrium points within the range of 234-289 K and 3-13 MPa.

Direct Measurement of the Four-Phase Equilibrium Coexistence Vapor-Aqueous Solution-Ice-Gas Hydrate in Water-Carbon Dioxide System.

Precise data on the non-variant equilibrium of the four phases (vapor-aqueous solution-ice-gas hydrate) in - coordinates are highly desired for developing accurate thermodynamic models and can be used as reference points (similar to the triple point of water). Using the two-component hydrate-forming system CO-HO, we have proposed and validated a new express procedure for determining the temperature and pressure of the lower quadruple point Q. The essence of the method is the direct measurement of these parameters after the successive formation of the gas hydrate and ice phases in the initial two-phase gas-water solution system under intense agitation of the fluids.

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 CH-HO-organic thermodynamic inhibitor (THI) were experimentally determined. Hydrate equilibrium measurements for systems with methanol (MeOH), monoethylene glycol (MEG), and diethylene glycol (DEG) were conducted. Five concentrations of each inhibitor (maximum content 50 mass%) were studied in the pressure range of 4.

Dataset for the dimethyl sulfoxide as a novel thermodynamic inhibitor of carbon dioxide hydrate formation.

The temperatures and pressures of the three-phase equilibrium V-L-H (gas - aqueous solution - gas hydrate) were measured in the CO - HO - dimethyl sulfoxide (DMSO) system at concentrations of organic solute in the aqueous phase up to 50 mass%. Measurements of CO hydrate equilibrium conditions were carried out using a constant volume autoclave by continuous heating at a rate of 0.1 K/h with simultaneous stirring of fluids by a four-blade agitator at 600 rpm.

An Experimental Investigation on the Kinetics of Integrated Methane Recovery and CO Sequestration by Injection of Flue Gas into Permafrost Methane Hydrate Reservoirs.

Large hydrate reservoirs in the Arctic regions could provide great potentials for recovery of methane and geological storage of CO. In this study, injection of flue gas into permafrost gas hydrates reservoirs has been studied in order to evaluate its use in energy recovery and CO sequestration based on the premise that it could significantly lower costs relative to other technologies available today. We have carried out a series of real-time scale experiments under realistic conditions at temperatures between 261.

CO Capture by Injection of Flue Gas or CO-N Mixtures into Hydrate Reservoirs: Dependence of CO Capture Efficiency on Gas Hydrate Reservoir Conditions.

Injection of flue gas or CO-N mixtures into gas hydrate reservoirs has been considered as a promising option for geological storage of CO. However, the thermodynamic process in which the CO present in flue gas or a CO-N mixture is captured as hydrate has not been well understood. In this work, a series of experiments were conducted to investigate the dependence of CO capture efficiency on reservoir conditions.

Preservation phenomena of methane hydrate in pore spaces.

Dissociation processes of methane hydrate synthesized with glass beads were investigated using powder X-ray diffraction and calorimetry. Methane hydrate formed with coarse glass beads dissociated quickly at 150-200 K; in this temperature range methane hydrate dissociates at atmospheric pressure. In contrast, methane hydrate formed with glass beads less than a few microns in size showed very high stability up to just below the melting point of ice, even though this temperature is well outside the zone of thermodynamic stability of the hydrate.