Experimental investigation of methane hydrate formation on suspended water droplets

Zhong, Dong‐Liang; Yang, Chen; Liu, D.P.; Wu, Zhimin

doi:10.1016/j.jcrysgro.2011.05.021

Cited by 17 publications

(15 citation statements)

References 20 publications

(29 reference statements)

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“…A possible mechanism is as follows: the thinner regions of the initially irregular crust are more permeable to gas and water and therefore get thicker more rapidly. This phenomenon has been observed by Uchida et al (1999) at the interface between water and CO 2 , and by Zhong et al (2011) at the interface between water and CH 4 .…”

Section: Hydrate Morphologiesmentioning

confidence: 63%

“…These and other authors (Servio and Englezos, 2003;Ohmura et al, 2004) examined hydrate crust mor phologies: a more faceted aspect (individual crystals of millimeter sizes) is observed at low subcooling ΔT, while a smooth appearance is noted at intermediate and high ΔT. Extensive observations of hydrate crust texture and lateral growth at water/gas interfaces have been conducted over the past decade, most of them focused on water/CH 4 systems, using various configurations: a rising (gas) bubble in water (Peng et al, 2007;Sun et al, 2007;Li et al, 2013Li et al, , 2014, a water drop (in gas) either pendent (Zhong et al, 2011) or sitting on a substrate (Tanaka et al, 2009), or a planar water/gas interface (Kitamura and Mori, 2013). While there is some scatter in the published lateral growth rates, all observations show that the hydrate crust texture gets smoother with increasing subcooling and increasing time.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrate growth at the interface between water and pure or mixed CO2/CH4 gases: Influence of pressure, temperature, gas composition and water-soluble surfactants

Daniel‐David

Guerton

Dicharry

et al. 2015

Chemical Engineering Science

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International audienceThe morphology and growth of gas hydrate at the interface between an aqueous solution and gaseous mixtures of CO2 and CH4 are observed by means of a simple experimental procedure, in which hydrate formation is triggered at the top of a sessile water drop by contact with another piece of gas hydrate and the ensuing hydrate growth is video-monitored. The aqueous solution is either pure water or a solution of a nonionic or anionic surfactant at low concentration (in the 100-1000ppmw range). In agreement with previously published data, hydrates formed from pure water and aqueous solutions of non-ionic surfactant grow rapidly as a low-permeable polycrystalline crust along the water/gas interface, which then inhibits further growth in a direction perpendicular to the interface. Lateral growth rates increase strongly with subcooling and CO2 content in the gas mixture. Similar lateral growth rates, but varying morphologies, are observed with the non-ionic surfactants tested. In contrast, the two anionic surfactants tested, sodium dodecyl sulfate (SDS) and dioctyl sodium sulfosuccinate (AOT), promote in the presence of CH4 (but not in the presence of CO2) a rapid and full conversion of the water drop into hydrate through a 'capillary-driven' growth process. Insights are given into this process, which is observed with AOT for an unprecedented low concentration of 100ppmw

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Section: Hydrate Morphologiesmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Hydrate growth at the interface between water and pure or mixed CO2/CH4 gases: Influence of pressure, temperature, gas composition and water-soluble surfactants

Daniel‐David

Guerton

Dicharry

et al. 2015

Chemical Engineering Science

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“…Some studies have reported on the effect of temperature and subcooling [81,82,[88][89][90][91], and stirring rate [40,89,91] on the induction time and nucleation rate [91] (p. 56) of hydrate formation. Results from laboratory experiments have shown that the average induction time decreases with decreasing temperature and increasing subcooling, and decreases with increasing stirring rate [81,82,[88][89][90][91]. Experimental results from the same cells used for the growth experiments in this work have corroborated reports from previous works.…”

Section: Nucleation Processmentioning

confidence: 99%

Gas Hydrate Growth Kinetics: A Parametric Study

Meindinyo

Svartaas

2016

Energies

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Gas hydrate growth kinetics was studied at a pressure of 90 bars to investigate the effect of temperature, initial water content, stirring rate, and reactor size in stirred semi-batch autoclave reactors. The mixing energy during hydrate growth was estimated by logging the power consumed. The theoretical model by Garcia-Ochoa and Gomez for estimation of the mass transfer parameters in stirred tanks has been used to evaluate the dispersion parameters of the system. The mean bubble size, impeller power input per unit volume, and impeller Reynold's number/tip velocity were used for analyzing observed trends from the gas hydrate growth data. The growth behavior was analyzed based on the gas consumption and the growth rate per unit initial water content. The results showed that the growth rate strongly depended on the flow pattern in the cell, the gas-liquid mass transfer characteristics, and the mixing efficiency from stirring. Scale-up effects indicate that maintaining the growth rate per unit volume of reactants upon scale-up with geometric similarity does not depend only on gas dispersion in the liquid phase but may rather be a function of the specific thermal conductance, and heat and mass transfer limitations created by the limit to the degree of the liquid phase dispersion is batched and semi-batched stirred tank reactors.

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“…Upon nucleation, hydrate films first grow laterally at the interfaces between water-rich and guest-rich phases; a general conclusion is that the film lateral growth rate is controlled by heat transfer (Freer et al, 2001;Mori, 2001;Mochizuki and Mori, 2006;Peng et al, 2007a,b;Sun et al, 2010). Due to difficulty in designing a proper experimental method (Servio and Englezos, 2003;Lee et al, 2005;Tanaka et al, 2009;Zhong et al, 2011;Wu et al, 2013), the lateral growth kinetics of hydrate films at the interface of water and oil with dissolved guest gas have rarely been investigated experimentally (Sun et al, 2010), which is of critical significance for understanding and controlling the plugging of oil and gas pipelines as shown in Figure 1, based on the idea from the CSM hydrate research group (Davies, 2009;Turner et al, 2009a, b;Joshi et al, 2013). After the lateral growth, the growth vertically in the thickness of the hydrate film is believed to switch to a process limited by mass transfer across the hydrate film Mochizuki, 1997, 2000;Taylor et al, 2007).…”

Section: Introductionmentioning

confidence: 99%