Crystal Growth of Clathrate Hydrate in Gas/Liquid/Liquid System: Variations in Crystal‐Growth Behavior

Ishida, Yosuke; Sakemoto, Riki; Ohmura, Ryo

doi:10.1002/chem.201002887

Cited by 13 publications

(26 citation statements)

References 20 publications

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“…Δ T sub is the difference between the experimental temperature T ex of crystal formation and the phase equilibrium temperature T eq of hydrates (Δ T sub ≡ T eq - T ex ). In the previous studies, − the relationships between Δ T sub and the crystal growth of sI and sII hydrates were revealed.…”

Section: Introductionmentioning

confidence: 98%

Diversity in Crystal Growth Dynamics and Crystal Morphology of Structure-H Hydrate

Matsuura

Horii

Alavi

et al. 2019

Crystal Growth & Design

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This paper demonstrates the diversity in crystal growth dynamics and crystal morphology of structure-H hydrate formed with methane and methylcyclohexane (MCH) correlated to the driving force. ΔT sub, which is the difference between the experimental temperature of the crystal growth and the phase equilibrium temperature, was used as an index of the driving force. At ΔT sub = 1.6 and 3.2 K, hydrate crystals were initially formed at the water/MCH interface and grew into the hydrate film covering the interface. After the entire interface was covered by the hydrate film, the hydrate growth stopped. The shape of individual hydrate crystals was polygonal. The size of hydrate crystals was smaller with increasing ΔT sub. At ΔT sub = 5.3 K, the first hydrate crystals were observed at the water/MCH interface and crystals grew not only along the interface but also toward the interior of MCH phase, even after the water/MCH interface was completely covered by the hydrate film. The dendritic hydrate crystals were observed at the interface at ΔT sub = 5.3 K. The implications of these observations on crystal morphology on determining the conditions for methane capture for the purpose of storage and transportation are discussed.

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Section: Introductionmentioning

confidence: 98%

Diversity in Crystal Growth Dynamics and Crystal Morphology of Structure-H Hydrate

Matsuura

Horii

Alavi

et al. 2019

Crystal Growth & Design

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“…Study on the growth mechanism of hydrate crystals is also of great importance for modeling of macroscopic kinetics of hydrate formation with respect to different application fields of gas hydrate. Many theoretical and experimental studies about the hydrate crystal growth have been performed with respect to different subcoolings and compositions of gas mixtures. However, a further understanding of the growth patterns of hydrate crystals is necessary, in view that most of those investigations only examined the formation pattern of hydrate crystals in two dimension.…”

Section: Introductionmentioning

confidence: 99%

“…However, a further understanding of the growth patterns of hydrate crystals is necessary, in view that most of those investigations only examined the formation pattern of hydrate crystals in two dimension. As already reviewed, the studies of in situ observations of hydrate crystals in three dimensions were only performed on structure II and structure H hydrates formed with two guests together. So far, to our knowledge, the crystal growth in three dimension of a simple structure I or structure II hydrate formed with only one guest component has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Initial thickness measurements and insights into crystal growth of methane hydrate film

et al. 2013

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The initial thickness of methane hydrate film was directly measured by suspending a single methane bubble in water at 274.0, 276.0, and 278.0 K. The results show that the initial hydrate film thickness decreases from tens of micrometers to about 10 mm with the subcooling increased from 0.5 K to about 3 K. When subcooling is higher than 1.0 K, all initial film thickness data measured under different temperatures vary inversely with the subcooling. Notable three-dimensional growths of hydrate crystals of different sizes and shapes at film front and emergence of new crystal were clearly observed at lower subcooling that resulting in the rougher surface of hydrate film and uncertainty of initial thickness measurement under lower subcooling. The hydrate film growth was dominated by film growth in thickness, not by lateral growth at low subcooling. The growth in thickness of hydrate shell covering one whole bubble surface was also investigated.

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“…1 There are three commonly studied gas hydrate structures that can be formed according to the guest molecule size: cubic structure I (sI), cubic structure II (sII) and hexagonal structure H (sH). 2−4 Recently, novel hydrate-related technologies have attracted attention in the energy and environmental fields.…”

Section: Introductionmentioning

confidence: 99%

Catastrophic Crystal Growth of Clathrate Hydrate with a Simulated Natural Gas System during a Pipeline Shut-In Condition

Sundramoorthy¹,

Sabil

Lal

et al. 2015

Crystal Growth & Design

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This paper presents a significant finding where capillaryaided catastrophic gas hydrate growth is observed under a shut-in condition (static fluid) for an uninhibited system. With the use of a newly designed apparatus, consisting of six units of identical rocking cell, nucleation and growth are observed. All experiments are conducted under isochoric conditions using 11.0 K subcooling (ΔT sub ) as a driving force. A simulated natural gas mixture of 90.0 mol % methane + 10.0% mol % propane is used as a gas phase. The liquid phase used is 3% (Na + , Cl − ) brine. The observations of the capillary-aided mass-transport mechanism for a catastrophic gas hydrate growth are presented in this work. Our observations show hydrate crystal formation at a brine wetted area close to the brine/gas interface initiates capillary-aided catastrophic hydrate growth. Moreover, no mass transfer restriction of brine toward catastrophic gas hydrate growth is observed. Furthermore, our results show the denser (less porous appearance) hydrate structures are continuously displaced from the hydrate−water interface (hydrate growth side). This displacement allowed new hydrate crystals to be formed uninterruptedly until the exhaustion of water in the cells. On the basis of macroscopic observations, the capillary-aided mass-transport mechanism for a catastrophic gas hydrate growth is presented.

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Crystal Growth of Clathrate Hydrate in Gas/Liquid/Liquid System: Variations in Crystal‐Growth Behavior

Cited by 13 publications

References 20 publications

Diversity in Crystal Growth Dynamics and Crystal Morphology of Structure-H Hydrate

Diversity in Crystal Growth Dynamics and Crystal Morphology of Structure-H Hydrate

Initial thickness measurements and insights into crystal growth of methane hydrate film

Catastrophic Crystal Growth of Clathrate Hydrate with a Simulated Natural Gas System during a Pipeline Shut-In Condition

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