Factors controlling hydrate film growth at water/oil interfaces

Li, Shengli; Wang, Yunfei; Sun, Chang‐Yu; Chen, Guangjin; Liu, Bei; Li, Zhi-Yun; Ma, Qing-Lan

doi:10.1016/j.ces.2015.01.057

Cited by 59 publications

(45 citation statements)

References 48 publications

(62 reference statements)

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“…Recent studies using high‐resolution confocal Raman spectroscopy by Davies et al indicated that host water molecules are more mobile in the hydrate phase and the hydrate film growth is controlled by the movement of water within the hydrate film. Water migration through hydrate layer was also repeatedly observed for water droplet both in oil and in gas …”

Section: Introductionmentioning

confidence: 61%

“…Based on experimental observations of Li et al, the following hydrate growth mechanism was proposed as shown in Figure . Before hydrate nucleation, water was dispersed in the oil phase as droplets.…”

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

“…Collision, agglomeration, and breakage induced by flow shear would promptly cause phases of water and hydrate to rearrange. Most of the formed hydrate shells would likely break (because hydrate shells were often reported to be fragile and thin in thickness) or integrate with either other crystals or remaining water droplets. It follows that the hydrate phase and the water phase would mix and coexist in the newly formed hydrate particles.…”

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

“…The fugacity of methane in the bulk oil phase is equal to the saturation fugacity of methane in the diesel oil

f_{V - O}^{e q}

as shown in Figure . The inner structure of hydrate particles probably consists of large numbers of micro pores and channels filled with water as shown inside the particle in Figure due to its porous and hydrophilic property . If the area of water–oil interface is assumed to be the same with that of water–hydrate interface, at quasi‐steady state, the transfer rate of methane from the bulk oil phase to the water phase could be given by:

r_{t} = π {k_{W - O} μ}_{2} true(t true) (|, f_{V - O}^{e q} - f_{W})

…”

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

“…Significant mass transfer resistance for gas molecules was exhibited by hydrate film when host water molecules were more mobile in the hydrate phase with the growth controlled by movement of water . Hydrates were reported to be microscopically porous and water migration through hydrate layer was also observed for water droplet both in oil and in gas . Possibly driven by capillary force in those pores connected to outer surface, the through‐film transfer by water was shown to be slow probably due to low interconnectivity in channels and corresponding resistance.…”

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

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A water droplet size distribution dependent modeling of hydrate formation in water/oil emulsion

Sun

Liu

et al. 2016

AIChE Journal

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Experimental data on chord length distributions and growth rate during methane hydrate formation in water‐in‐oil emulsions were obtained in a high pressure stirring reactor using focused beam reflectance measurement and particle video microscope. The experiments were carried out at 274.2 K for 10–30% water cuts and agitation rates ranging from 200 to 500 rpm initially at 7.72 MPa. Rapid growth was accompanied by gradually decrease in rate. Free water was observed to become depleted during rapid growth while some water remained encapsulated inside hydrate layers constituting a mass transfer barrier. The apparent kinetic constants of methane hydrate formation and free‐water fractions were determined using a newly developed kinetic model independent of the dissolution rate at the gas–oil interface. It was illustrated that continued growth depends on distribution and transfer of water in oil‐dominated systems. This perception accords with observations of hydrate film growth on suspended water droplet in oil and clarifies transfer limits in kinetics. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1010–1023, 2017

show abstract

Section: Introductionmentioning

confidence: 61%

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

“…The fugacity of methane in the bulk oil phase is equal to the saturation fugacity of methane in the diesel oil

f_{V - O}^{e q}

r_{t} = π {k_{W - O} μ}_{2} true(t true) (|, f_{V - O}^{e q} - f_{W})

…”

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

Section: Modeling Of Hydrate Growth Kineticsmentioning

confidence: 99%

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A water droplet size distribution dependent modeling of hydrate formation in water/oil emulsion

Sun

Liu

et al. 2016

AIChE Journal

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Crystallization Mechanisms and Rates of Cyclopentane Hydrates Formation in Brine

et al. 2019

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Clathrate hydrates most often grow at the interface between liquid water and another fluid phase (hydrocarbon) acting as a provider for the hydrate guest molecules, and some transfer through this shell is required for the hydrate growth to proceed, thus self-limiting the reaction rate. An optical microscope and a horizontal reaction cell are utilized to capture the shell growth phenomenology and to estimate the hydrate layer growth rates from sequential pictures. Cyclopentane (CP) is chosen as the hydrate-forming molecule to obtain hydrates at low pressure. Experimental hydrate layer growth rates are provided for the CP+brine system, using various combinations of salts and degrees of subcooling.

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Hydrate-based CO2 separation

Saikia¹,

Sultan²

2022

Emerging Carbon Capture Technologies

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Factors controlling hydrate film growth at water/oil interfaces

Cited by 59 publications

References 48 publications

A water droplet size distribution dependent modeling of hydrate formation in water/oil emulsion

A water droplet size distribution dependent modeling of hydrate formation in water/oil emulsion

Crystallization Mechanisms and Rates of Cyclopentane Hydrates Formation in Brine

Hydrate-based CO2 separation

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