THF–water hydrate crystallization: an experimental investigation

Devarakonda, Surya; Groysman, Alexander; Myerson, Allan S.

doi:10.1016/s0022-0248(99)00220-1

Cited by 96 publications

(68 citation statements)

References 5 publications

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“…This hydrate melts at a temperature of 4.4°C and 101.3 kPa, although the melting temperature varies between 0 and 4.4°C depending on the THF concentration (Hanley et al 1989). Although mass transfer at the liquid-gas interface controls the nucleation and crystal growth of gas hydrates, the mass transfer effects are eliminated for THF hydrate (Devarakonda et al 1999). The physical properties of solutions and THF hydrate are listed in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Observation of Frost Heave of THF Clathrate Hydrate on Porous Glass Powder

Watanabe

Yokokawa

Muto

2006

Current Practices in Cold Regions Engineering

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The formation processes of clathrate hydrate in porous glass powder saturated with a THF-water mixture were directly observed using directional cooling apparatus. As the cooling rate decreased, the THF hydrate grew while excluding glass particles and formed a lens like layer of hydrate in the same manner as in the phenomenon of ice lens formation in the freezing of soil. The growth rate of the hydrate lens was proportional to the degree of supercooling of the growth surface and was about 1/20th the growth rate of the hydrate layer in a THF-water mixture without glass particles. When sodium chloride was added to the system, the growth of the hydrate lens was inhibited depending on the salt concentration.

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Section: Methodsmentioning

confidence: 99%

Observation of Frost Heave of THF Clathrate Hydrate on Porous Glass Powder

Watanabe

Yokokawa

Muto

2006

Current Practices in Cold Regions Engineering

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“…Se considera T ref como la temperatura de formación de hidratos sin aditivos, la cual para el THF es 277,6 K [3].…”

Section: A Sistema a Presión Atmosféricaunclassified

“…El THF es un éter cíclico soluble en agua, capaz de formar hidratos de estructura tipo sII, a presión atmosférica [3].…”

Section: A Sistema a Presión Atmosféricaunclassified

Evaluación de inhibidores de hidratos en sistemas a presión atmosférica y alta presión

Ricaurte

Moreno

Gómez

2018

CCTESPE

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Resumen-En este trabajo se realizó un estudio experimental de los procesos de formación y disociación de hidratos en sistemas a presión atmosférica y a alta presión. Se evaluó el potencial de compuestos naturales (provenientes de fuentes no comestibles), como inhibidores para prevenir problemas de aseguramiento de flujo por la formación de hidratos en operaciones de producción y procesamiento de gas natural. En las pruebas a presión atmosférica se empleó tetrahidrofurano (THF) como molécula huésped. Se diseñó y ensambló un equipo a alta presión para evaluar el comportamiento de los hidratos de gas a altas presiones y bajas temperaturas, empleando dióxido de carbono (CO2) y metano (CH4).Palabras Claves-Alta presión, inhibidores, hidratos, compuestos naturales, presión atmosférica.Abstract-In this work, processes of hydrate formation and dissociation at atmospheric pressure and high pressure conditions were experimentally studied. The potential of some natural compounds (from non-edible sources) was evaluated as thermodynamic inhibitors to prevent flow assurance problems due to hydrates formation in natural gas production and processing operations. In atmospheric pressure tests, tetrahydrofuran (THF) was used as guest molecules. A high pressure equipment was designed and commissioned to evaluate the behavior of gas hydrates at high pressure and low temperatures, using carbon dioxide (CO2) and methane (CH4).

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“…[2][3][4] At the appropriate thermodynamic conditions (in most cases corresponding to relatively high pressures and low temperatures), water as the host molecule forms a framework through a hydrogen bonding network of cages which can be occupied by the guest molecules, whose diameter is less than the size of the cavity. [5] Active methods have been developed to prevent the formation of hydrate inside oil and gas pipelines by applying heat to the pipelines, [6] adding water-miscible alcohols such as methanol to shift the thermodynamic equilibrium away from hydrate formation, [7] and using kinetic inhibitors to delay the crystallization and growth of hydrates. [4,8] However, these methods are expensive, require substantial power for operation, and may have detrimental environmental consequences.…”

Section: Introductionmentioning

confidence: 99%

“…[4,8] However, these methods are expensive, require substantial power for operation, and may have detrimental environmental consequences. [4,6,7,8] Therefore, surface modification is of great interest for the passive prevention of hydrate formation directly on the surface. Additionally, should any hydrate form, either on the surface or in the bulk, reducing the adhesion strength of the hydrate to the surface is desirable for ease of clearing the blockage.…”

Section: Introductionmentioning

confidence: 99%

Designing Durable Vapor‐Deposited Surfaces for Reduced Hydrate Adhesion

Sojoudi

Walsh

Gleason

et al. 2015

Adv Materials Inter

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The formation and accumulation of clathrate hydrates inside oil and gas pipelines causes severe problems in deep-sea oil/gas operations. In the present work, durable and mechanically-robust bilayer poly-divinyl benzene (pDVB)/poly(perfluorodecylacrylate) (pPFDA) coatings are developed using initiated chemical vapor deposition (iCVD) to reduce the adhesion strength of hydrates to underlying substrates. Tetrahydrofuran (THF) dissolved in water with a wt. % concentration of 0-70 is used to study the formation of hydrates and their adhesion strength. Goniometric measurements of water droplets on the coated substrates exhibit advancing contact angles of 157.8º ± 2.3º and receding contact angles of 131º ± 8º, whereas 70 wt. % THF in water droplets present advancing angle of 85.1º ± 6.1º and receding angle of 48.5º ± 4.9º. The strength of hydrate adhesion experiences a ten-fold reduction when substrates are coated with these iCVD polymers: from 1050±250 kPa on bare substrates to 128±100 kPa on coated ones. The impact of subcooling temperature and time on the adhesion 2 strength of hydrate on substrates is also studied. The results of this work suggest that the THF-water mixture repellency of a given substrate can be utilized to assess its hydrate-phobic behavior; hence, it opens a pathway for studying hydrate-phobicity.

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THF–water hydrate crystallization: an experimental investigation

Cited by 96 publications

References 5 publications

Observation of Frost Heave of THF Clathrate Hydrate on Porous Glass Powder

Observation of Frost Heave of THF Clathrate Hydrate on Porous Glass Powder

Evaluación de inhibidores de hidratos en sistemas a presión atmosférica y alta presión

Designing Durable Vapor‐Deposited Surfaces for Reduced Hydrate Adhesion

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