Interfacial mechanisms governing cyclopentane clathrate hydrate adhesion/cohesion

Aman, Zachary M.; Brown, Evelyn C.; Sloan, E. Dendy; Sum, Amadeu K.; Koh, Carolyn A.

doi:10.1039/c1cp21907c

Cited by 225 publications

(341 citation statements)

References 64 publications

Supporting

Mentioning

331

Contrasting

Unclassified

Order By: Relevance

“…[27][28] The effects of contact force, contact time, and subcooling temperature were investigated in these studies. 22,[25][26][27][28] Hun et al also studied the interaction between hydrate particles and water in a temperature-controlled hydrocarbon environment utilizing an apparatus fabricated with a microbalance and z-axis stage. [29][30] Both groups explained the trends observed in the measured adhesion forces in terms of a capillary bridge formed between the contacting hydrate particles and/or hydrate particles and liquid droplets.…”

mentioning

confidence: 99%

“…4,6,9,[20][21][22][23][24][25] They formed CyC5 hydrate particles by freezing water droplets inside a bath of CyC5 and then brought them into contact with either similarly-formed CyC5 hydrate particles or various solid surfaces. [26][27][28] They used a micro-mechanical adhesion apparatus to measure the adhesion force between previously-formed hydrate particles, 22,26 and/or hydrate and ice particles, with and without the presence of another liquid (e.g. crude oil).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Investigation into the Formation and Adhesion of Cyclopentane Hydrates on Mechanically Robust Vapor-Deposited Polymeric Coatings

Sojoudi¹,

Walsh

Gleason³

et al. 2015

Langmuir

View full text Add to dashboard Cite

Blockage of pipelines by formation and accumulation of clathrate hydrates of natural gasses (also called gas hydrates) can compromise project safety and economics in oil and gas operations, particularly at high pressures and low temperatures such as those found in subsea or arctic environments. Cyclopentane (CyC5) hydrate has attracted interest as a model system for studying natural gas hydrates, because CyC5, like typical natural gas hydrate formers, is almost fully immiscible in water; and thus CyC5 hydrate formation is governed not only by thermodynamic phase considerations but also kinetic factors such as hydrocarbon/water interfacial area and mass & heat transfer, as for natural gas hydrates. We present a macroscale investigation of the formation and adhesion strength of CyC5 hydrate deposits on bilayer polymer coatings with a range of wettabilities. The polymeric bilayer coatings are developed using initiated chemical vapor deposition (iCVD) of a mechanically-robust and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 densely-cross-linked polymeric base layer (poly-divinyl benzene or pDVB) that is capped with a covalently-attached thin hydrate-phobic fluorine-rich top layer (polyperfluorodecylacrylate or pPFDA). The CyC5 hydrates are formed from CyC5-in-water emulsions, and differential scanning calorimetry (DSC) is used to confirm the thermal dissociation properties of the solid hydrate deposits. We also investigate the adhesion of the CyC5 hydrate deposits on bare and bilayer polymer-coated silicon and steel substrates.Goniometric measurements with drops of CyC5-in-water emulsions on the coated steel substrates exhibit advancing contact angles of 148.3º ± 4.5º and receding contact angles of 142.5º ± 9.8º, indicating the strongly emulsion-repelling nature of the iCVD coatings. The adhesion strength of the CyC5 hydrate deposits reduced from 220±45 kPa on rough steel substrates to 20±17 kPa on the polymer-coated steel substrates. The measured strength of CyC5 hydrate adhesion is found to correlate very well with the work of adhesion between the emulsion droplets used to form the CyC5 hydrate and the underlying substrates.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Investigation into the Formation and Adhesion of Cyclopentane Hydrates on Mechanically Robust Vapor-Deposited Polymeric Coatings

Sojoudi¹,

Walsh

Gleason³

et al. 2015

Langmuir

View full text Add to dashboard Cite

show abstract

“…The location and amount of water could be an important variable in determining overall cohesive force [22]. Thus excess free water and/or the presence of water film should affect cohesive force [22][23][24][25][26], interparticle aggregation and viscosity. According to the proposed mechanism of anti-agglomeration [3] in oil-dominated systems, Span 20 may disperse water droplets into the oil phase evenly, while another component of AA may interact with hydrate surface to prevent particles from agglomeration.…”

Section: Equilibrium Viscosity Of Hydrate Slurry With Different Aasmentioning

confidence: 99%

Effects of Combined Sorbitan Monolaurate Anti-Agglomerants on Viscosity of Water-in-Oil Emulsion and Natural Gas Hydrate Slurry

Guan

Guo

et al. 2017

Energies

View full text Add to dashboard Cite

Hydrate plugging is the major challenge in the flow assurance of deep-sea pipelines. For water-in-oil emulsions, this risk could be significantly reduced with the addition of anti-agglomerants (AAs). Hydrates often form from water-in-oil emulsions and the measurement of emulsion and slurry viscosity constitutes the basis for the application of hydrate slurry flow technology. In this work, using a novel high-pressure viscometer, emulsion and slurry viscosity with different AAs for water content ranging from 5% to 30% was obtained. The viscosity-temperature curves of emulsions were determined and correlated. The variation of system viscosity during hydrate formation from water-in-oil emulsions was examined, the sensitivity of stable slurry viscosity to water cut and the effects of temperature on annealed slurry viscosity were investigated. The results indicated that the variation of viscosity during hydrate formation relies on the conversion ratio. It also implied that the sensitivity of slurry viscosity to change in its water cut or temperature was reduced with AA addition.

show abstract

“…[24] The effects of contact force, contact time, and subcooling temperature were investigated in these studies. [23,24,25,26] Hun et al, studied interaction behavior between hydrate particles and water in a temperature-controlled hydrocarbon environment utilizing an apparatus fabricated with a microbalance and z-axis stage. [27] Both groups explained the adhesion forces and trends by a capillary bridge forming between the contacting hydrate particles and/or hydrate particles and liquid droplets.…”

Section: Introductionmentioning

confidence: 99%

“…Sloan and coworkers have investigated the formation and adhesion of hydrate particles in a series of studies. [23,24] They used a micro-mechanical adhesion apparatus to measure adhesion force between already formed hydrate particles, [23,25] and/or hydrate and ice particles with and without the presence of other liquid (e.g. crude oil).…”

Section: Introductionmentioning

confidence: 99%

Designing Durable Vapor‐Deposited Surfaces for Reduced Hydrate Adhesion

Sojoudi

Walsh

Gleason

et al. 2015

Adv Materials Inter

View full text Add to dashboard Cite

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.

show abstract

Interfacial mechanisms governing cyclopentane clathrate hydrate adhesion/cohesion

Cited by 225 publications

References 64 publications

Investigation into the Formation and Adhesion of Cyclopentane Hydrates on Mechanically Robust Vapor-Deposited Polymeric Coatings

Investigation into the Formation and Adhesion of Cyclopentane Hydrates on Mechanically Robust Vapor-Deposited Polymeric Coatings

Effects of Combined Sorbitan Monolaurate Anti-Agglomerants on Viscosity of Water-in-Oil Emulsion and Natural Gas Hydrate Slurry

Designing Durable Vapor‐Deposited Surfaces for Reduced Hydrate Adhesion

Contact Info

Product

Resources

About