Crystal growth phenomena of CH4 + C3H8 + CO2 ternary gas hydrate systems

Ward, Zachary T.; Johns, Michael L.; May, Eric F.; Koh, Carolyn A.; Aman, Zachary M.

doi:10.1016/j.jngse.2016.05.050

Cited by 9 publications

(14 citation statements)

References 13 publications

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“…Aman and Koh recently studied the formation of hydrates from either pure methane gas, or a ternary gas mixture containing CH4, CO2 and C3H8. 77 They found that CO2 hydrates adhere to the vessel surfaces much more strongly than CH4 ones. Sojoudi et al 78 considered the adhesion of cyclopentane hydrates on polymeric coatings.…”

Section: Preventing Hydrate Plugs Formation In Pipelinesmentioning

confidence: 99%

Clathrate hydrates: recent advances on CH₄ and CO₂ hydrates, and possible new frontiers

Striolo

2019

Molecular Physics

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Gas hydrates continue to attract enormous attention throughout the energy industry, as both a hindrance in conventional production and a substantial unconventional resource. Scientists continue to be fascinated by hydrates because of their peculiar properties, including the ability of sequestering large amounts of hydrophobic gases, unusual thermal transport properties, and unique molecular structures. From a technological point of view, clathrate hydrates offer potential advantages in applications as diverse as natural gas production, carbon sequestration, water desalination and natural gas storage. The communities interested in hydrates span traditional academic disciplines, including earth science, physical chemistry, and petroleum engineering. The studies on this field are equally diverse, including field expeditions to attempt the production of natural gas from hydrate deposits accumulated naturally on the seafloor, to lab-scale studies to attempt to exchange CO2 for the CH4 present in hydrate deposits; from the scale up of water desalination plants to the testing of compounds used to prevent the formation of large hydrate plugs in pipelines; from theoretical studies to understand the stability of hydrates depending on the guest molecules, to molecular simulations to probe nucleation mechanisms. This review highlights a few fundamental questions faced by the research community, with focus on knowledge gaps representing some of the barriers that must be addressed to enable growth in the practical applications of hydrate technology, including natural gas storage, water desalination, CO2-CH4 exchange in hydrate deposits, and prevention of hydrate plugs in conventional energy transportation.

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Section: Preventing Hydrate Plugs Formation In Pipelinesmentioning

confidence: 99%

Clathrate hydrates: recent advances on CH₄ and CO₂ hydrates, and possible new frontiers

Striolo

2019

Molecular Physics

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“…It consisted of a sapphire cell (25.4 mm internal diameter, 150 mm height and 6.4 mm thickness, 21.0 MPa rating) with a high pressure magneticallycoupled mixing shaft (MRK Mini 100-50) connected to a ViscoPakt Rheo-57 motor. The motor was capable of producing mixing speeds up to 1800 RPM, with a tolerance in practice The experimental procedure has been described in detail previously 20 . In each experiment, the cell was thoroughly cleaned with sequential rinses of toluene, ethanol, and acetone, dried overnight, and loaded with water, MDEA and/or the MEG.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental procedure has been described in detail previously. 20 In each experiment, the cell was thoroughly cleaned with sequential rinses of toluene, ethanol, and acetone, dried overnight, and loaded with water, MDEA, and/or MEG. The cell was then purged with the target gas (methane or gas mixture) three times at 2.0 MPa and then pressurized to the target starting pressure (6.0, 7.0, 8.0, or 9.0 MPa); the mixing system was engaged at 1000 rpm with the system outside the hydrate region at 293.15 K. The cell was left overnight to confirm the absence of leaks and then cooled to 277.15 K at a rate of 1 K/h.…”

Section: Methodsmentioning

confidence: 99%

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Gas Hydrate Thermodynamic Inhibition with MDEA for Reduced MEG Circulation

et al. 2017

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In the production of natural gas, (mono-)ethylene glycol (MEG) is commonly added to the well stream to prevent the formation of clathrate natural gas hydrates. A reduction in the amount of MEG required for hydrate prevention in industrial subsea flowlines would decrease the costs associated with natural gas production. Methyldiethanolamine (MDEA) is sometimes used for corrosion control in wet gas flowlines by increasing the solution pH, and will be typically injected with the MEG. In systems where both hydrate and corrosion control is required, hydrate inhibition via MDEA could represent an opportunity to reduce the required MEG injection rate. However, no experimental data are available to quantify the degree to which MDEA may act as a hydrate inhibitor, either in isolation or in the presence of MEG. In this work, we report 20 measurements of the hydrate phase boundary in the presence of MDEA (3 to 7 vol%) and MEG (0 or 20 vol%), performed at high pressure (6 to 9 MPa) in a sapphire autoclave cell with both ultra-high purity methane and a natural gas mixture. The results illustrate that MDEA acts as a hydrate inhibitor and, when combined with MEG, provides additional inhibition. For the systems studied, the effectiveness of MDEA as a hydrate inhibitor is approximately half that of MEG. When 20 vol% MEG was added to the aqueous phase, the MDEA became less effective as a hydrate inhibitor. However, 7 vol% MDEA still caused an average temperature shift in the hydrate phase boundary of 0.3 K, which is equivalent to the effect that would be achieved by increasing the amount of MEG in the system by 3 % (i.e. from 20 vol% to 20.6 vol% MEG).

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“…Propane can also form the hydrate under a certain temperature and pressure condition, and the hydrate phase equilibrium pressure was lower than that of methane gas under the same temperature condition. Some scholars carried out the hydrate formation experiment utilizing the mixture of methane and propane gas [20,21], and the mixed gas phase equilibrium parameters and the crystal structure of gas hydrate were measured. Prado et al [22] research showed that hydrate formation of methane and propane mixed gas was faster, and the amount of hydrate was bigger, which indicated that propane can promote the formation of methane hydrate.…”

Section: Journal Of Chemistrymentioning

confidence: 99%

Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

Zhang

2017

Journal of Chemistry

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In order to explore the method of accelerating hydration separation process to recover methane from mine gas, propane hydrate phase equilibrium was used to measure the equilibrium points of three kinds of mine gas in NaCl solution. Driving force was set as 1 MPa on this basis and high-pressure experimental apparatus of mine gas hydrate was used to carry out the nucleation kinetics experiments of mine gas hydrate for three gas samples in different concentrations of sodium chloride (NaCl) and sodium dodecyl sulfate (SDS) compound systems, which was to study the effect of propane and NaCl-SDS solution on nucleation process of mine gas hydrate. The results showed that induction time of multicomponent mine gas hydrate formation was shortened with the decrease of methane concentration and increase of propane concentration. The induction time of mine gas hydrate formation was shortened with the reduction of NaCl concentration and the increase of SDS concentration. It was found that methane and propane in multicomponent mine gas nucleated collaboratively, which simplified its nucleation process compared with the single component. NaCl has two kinds of functions.

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Crystal growth phenomena of CH4 + C3H8 + CO2 ternary gas hydrate systems

Cited by 9 publications

References 13 publications

Clathrate hydrates: recent advances on CH₄ and CO₂ hydrates, and possible new frontiers

Clathrate hydrates: recent advances on CH₄ and CO₂ hydrates, and possible new frontiers

Gas Hydrate Thermodynamic Inhibition with MDEA for Reduced MEG Circulation

Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

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Crystal growth phenomena of CH4 + C3H8 + CO2 ternary gas hydrate systems

Cited by 9 publications

References 13 publications

Clathrate hydrates: recent advances on CH4 and CO2 hydrates, and possible new frontiers

Clathrate hydrates: recent advances on CH4 and CO2 hydrates, and possible new frontiers

Gas Hydrate Thermodynamic Inhibition with MDEA for Reduced MEG Circulation

Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

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Clathrate hydrates: recent advances on CH₄ and CO₂ hydrates, and possible new frontiers

Clathrate hydrates: recent advances on CH₄ and CO₂ hydrates, and possible new frontiers