Kinetics of Methane Hydrate Formation from SDS Solution

Zhang, J. S.; Lee, Sang-Yong; Lee, Jae Woo

doi:10.1021/ie070627r

Cited by 267 publications

(220 citation statements)

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“…In recent years, the kinetic parameters of clathrate hydrate formation (such as induction time, the quantity of gas uptake and growth rate) in the presence of different additives have been studied by many researchers (Arjang et al 2013;Bi et al 2009;Dashti et al 2015;Farhang et al 2014;Fazlali et al 2013;Ganji et al 2007a, b;Kang and Lee 2010;Kumar et al 2013;Lirio et al 2013;Manteghian et al 2013;Mohammadi et al 2014a;Ricaurte et al 2014;Rogers et al 2007;Roosta et al 2015;Sabil et al 2010;Torré et al 2011;Zhang et al 2004Zhang et al , 2007. Mohammadi and coworkers studied the impact of sodium dodecyl sulfate and silver nanoparticles on the kinetic parameters of CO 2 clathrate hydrate formation (Mohammadi et al 2014a).…”

Section: Introductionmentioning

confidence: 99%

Kinetics of (TBAF + CO2) semi-clathrate hydrate formation in the presence and absence of SDS

et al. 2018

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In this communication, the impacts of adding SDS (sodium dodecyl sulfate), TBAF (tetra-n-butylammonium fluoride) and the mixture of SDS ? TBAF on the main kinetic parameters of CO 2 hydrate formation (induction time, the quantity and rate of gas uptake, and storage capacity) were investigated. The tests were performed under stirring conditions at T = 5°C and P = 3.8 MPa in a 169 cm 3 batch reactor. The results show that adding SDS with a concentration of 400 ppm, TBAF with a concentration of 1-5 wt%, and the mixture of SDS ? TBAF, would increase the storage capacity of CO 2 hydrate and the quantity of gas uptake, and decrease the induction time of hydrate formation process. The addition of 5 wt% of TBAF and 400 ppm of SDS would increase the CO 2 hydrate storage capacity by 86.1% and 81.6%, respectively, compared to pure water. Investigation of the impact of SDS, TBAF and their mixture on the rate of gas uptake indicates that the mixture of SDS ? TBAF does not have a significant effect on the rate of gas uptake during hydrate formation process.Keywords Semi-clathrate hydrate Á Gas hydrate Á Kinetics Á CO 2 Á SDS Á TBAF List of symbols P Pressure R Universal gas constant T Temperature V Volume of the gas phase Z Compressibility factor Subscripts 0 Conditions of the cell at time t = 0 i Counter t Time w Water

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Section: Introductionmentioning

confidence: 99%

Kinetics of (TBAF + CO2) semi-clathrate hydrate formation in the presence and absence of SDS

et al. 2018

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“…Much research targets the mechanism of hydrate formation in the presence of surfactants. Consequently, a number of hypotheses were suggested and investigated (Tajima and Yamasaki , 2009;Zhang et al, 2007). These studies, mostly relate the action of the additives with changing the mass transfer resistance, acceleration or prevention of the hydrate crystal agglomeration and changing the surface properties of water due to the adsorption of ions and surfactants.…”

Section: Surfactantsmentioning

confidence: 99%

“…Figure 2.2 shows the mechanism proposed for the formation of hydrate in such a system. In another study by Zhang et al (2007), it was assumed that SDS monomer molecules can align in the gas-liquid interface. Then, the hydrate nucleation may begin from the reactor wall of the gas-liquid interface where the temperature is the lowest due to the coolant circulation and finally, gas hydrates grow upward on the wall by transferring the SDS liquid solution to the porous hydrates by capillary force.…”

Section: Surfactantsmentioning

confidence: 99%

“…It was concluded that SDS not only increases hydrate nucleation rate by reducing the interfacial tension between hydrate and liquid but also accelerates hydrate growth rate by increasing the total surface area of hydrate particles and the gas-liquid interfacial area. Figure 2.3 illustrates the mechanism proposed by Zhang et al (2007).…”

Section: Surfactantsmentioning

confidence: 99%

“…Many researchers investigated the hydrate formation process to find the promotion mechanism and how surfactants affect the formation rate. However, none of the proposed mechanism is fully approved and further research is required in this area (Lo et al, 2012b;Tajima and Yamasaki, 2009;Zhang et al, 2007). Classical molecular dynamic simulation has been applied to examine the inhibition mechanism of NaCl on hydrate formation (Qi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Farhang¹

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CO 2 capture by trapping the greenhouse gas in clathrates hydrates is proving to be one of the promising options for long term carbon storage. This technology is desirable as it can be deposited in the deep ocean where the suitable pressure and temperature is ready without any extra cost. To date, this method has mostly been of academic interest because the formation of gas hydrates is very slow and requires lots of energy and resources. It is important therefore to develop an efficient and economical process to be able to apply this method at an industrial scale. Scientists and researchers have been looking for suitable additives to accelerate the formation of CO 2 hydrate. To meet these objectives numerous additives have previously been tested and several were found to be suitable hydrate promoters. The mechanism for the formation of gas hydrates in the presence of additives is not clear yet. Understanding this mechanism would help us to select and synthesise the most suitable and cost effective additive.In this thesis, two groups of chemicals i.e. salt and hydrophobic particles were added to the hydrate formation reactor and examined. Initially sodium halides were tested for their effect on the kinetics of the formation of CO 2 hydrates in an isochoric system. The effect of different anion types and concentrations was investigated by directly measuring pressure and temperature changes in the reactor and evaluating maximum CO 2 uptake, conversion, storage capacity, induction time, and hydrate growth rate. The results indicated that sodium halides at a concentration of 50 mM (mmol/L) increase CO 2 consumption and conversion to hydrates. In addition, sodium iodide and sodium bromide in a range of concentrations between 50 and 250 mM significantly increased the hydrate formation kinetics. Measurements of the surface potential of CO 2 hydrates formed in the presence of sodium halides showed negative charge on hydrates with the highest zeta potential observed at the concentration of 50 mM. The findings of this part of the research led us to propose a mechanism for the formation of CO 2 hydrates in the presence of sodium halides.The second group of additives extensively investigated in the current research were hydrophobic nano-particles. Two types of hydrophobic fumed silica were studied.iii They produced two types of particle stabilised systems when mixed with water (i.e. silica foam and dry water). The influence of particle hydrophobicity and concentration on hydrate formation kinetics was established by monitoring gas consumption, CO 2 conversion and induction time. The morphology, microstructure, and pore characteristics were elucidated by cryogenic scanning electron microscopy (cryo-SEM), and the elemental distribution and composition were determined by X-ray energy dispersive spectroscopy (EDS). The results indicated that the promoting effect of hydrophobic fumed silica was dependent on the particle hydrophobicity and on the weight ratio of silica to water. The kinetics of CO 2 hydrate formation were ...

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Methane hydrate production using a novel spiral‐agitated reactor: Promotion of hydrate formation kinetics

2021

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To enhance hydrate formation kinetics, we presented a novel spiral‐agitated reactor, where hydrates were synthetized in pure water systems, and fast hydrate kinetics was observed under extremely mild conditions. Hydrates can nucleate within 4 min under 3.5 MPa and 275.15 K at a rotating speed of 60 rpm, and large water‐to‐hydrate conversion (>85%) was obtained at a moderate condition of 4.85 MPa, 275.15 K, and 30 rpm with an average methane uptake of 139.78 V/V, demonstrating that pure water systems are feasible for hydrate‐based solidified natural gas (SNG) technology. Numerical simulations of flow fields inner the reactor were carried out, and four mechanisms behind the excellent promotion were proposed, dual‐agitation, two‐way convection, interfacial impact and micro bubbles, which significantly improve mass transfer, giving rise to fast hydrate nucleation and growth kinetics. These findings suggest extraordinary performance of spiral agitation, and this may pave way on the industrial application of hydrate‐based SNG technology.

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Kinetics of Methane Hydrate Formation from SDS Solution

Cited by 267 publications

References 24 publications

Kinetics of (TBAF + CO2) semi-clathrate hydrate formation in the presence and absence of SDS

Kinetics of (TBAF + CO2) semi-clathrate hydrate formation in the presence and absence of SDS

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Methane hydrate production using a novel spiral‐agitated reactor: Promotion of hydrate formation kinetics

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