The dual effect of sodium halides on the formation of methane gas hydrate

Nguyễn, Như Gia; Nguyen, Anh V.

doi:10.1016/j.fuel.2015.04.022

Cited by 73 publications

(69 citation statements)

References 41 publications

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“…Evidently, at the dilute concentration of 0.125% TBAB displays an inhibition effect on the gas uptake which has not been reported previously and is unexpected. The dual effect of TBAB on inhibiting and enhancing gas uptake at low and high concentrations, respectively, is similar to the dual effect of NaX (X = I -, Cl -) on gas hydrate formation, which was observed and reported from our laboratory previously [21,30]. Experimental results for gas uptake versus TBAB concentration and time: The dual effect of TBAB on the formation of CO 2 gas hydrates.…”

Section: Molecular Dynamic Simulationsupporting

confidence: 83%

“…The timedependent gas uptake and growth rate of gas hydrates were calculated using state equation of real gas, and the compressibility factor of gaseous CO 2 was calculated using Pitzer's correlations [20]. A fuller description of the experimental procedure and calculation method has been reported in our previous publications [21,22].…”

Section: Experimental Methodsmentioning

confidence: 99%

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Unexpected inhibition of CO2 gas hydrate formation in dilute TBAB solutions and the critical role of interfacial water structure

Nguyễn

Nguyen

et al. 2016

Fuel

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Gas hydrates formed under moderated conditions open up novel approaches to tackling issues related to energy supply, gas separation, and CO 2 sequestration. Several additives such as tetra-n-butylammonium bromide (TBAB) have been empirically developed and used to promote gas hydrate formation. Here we report unexpected experimental results which show that TBAB inhibits CO 2 gas hydrate formation when used at minuscule concentration. We also used spectroscopic techniques and molecular dynamics simulation to gain further insights and explain the experimental results. They have revealed the critical role of water alignment at the gas-water interface induced by surface adsorption of tetra-n-butylammonium cation (TBA +) which gives rise to the unexpected inhibition of dilute TBAB solution. The water perturbation by TBA + in the bulk is attributed to the promotion effect of high TBAB concentration on gas hydrate formation. We explain our finding using the concept of activation energy of gas hydrate formation. Our results provide a step toward to mastering the control of gas hydrate formation.

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Section: Molecular Dynamic Simulationsupporting

confidence: 83%

Section: Experimental Methodsmentioning

confidence: 99%

Unexpected inhibition of CO2 gas hydrate formation in dilute TBAB solutions and the critical role of interfacial water structure

Nguyễn

Nguyen

et al. 2016

Fuel

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“…The hydrate formation in the montmorillonite samples is different from other porous media because of the presence of bound water, which changes the P-T curve of hydrate formation and decomposition [23]. The promotion effect of montmorillonite and the inhibition effect of electrolyte compete in the mineral solution, causing the promotion of the formation of hydrate thermodynamics with increasing montmorillonite content when the concentration of montmorillonite is low [25]. At the same time, hydrate formation would be inhibited by a high concentration of montmorillonite [27].…”

Section: Phase Behavior Of Methane Hydrate In Montmorillonite Samplesmentioning

confidence: 99%

“…At the same time, the decomposition temperature of bound water hydrate also depends on the initial water content and is controlled by the thickness of hydrate layer between mineral layers [23,24]. Nguyen et al [25] found that low-concentration montmorillonite solution had a thermodynamic promoting effect on the formation of hydrate. Park and Sposito [26] studied the methane hydrate on the surface of montmorillonite through molecular simulation, and obtained the thermodynamic promoting effect of montmorillonite.…”

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confidence: 99%

Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite

Yan

Chen

et al. 2020

Energies

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In marine sediments, seawater influences the phase behavior of natural gas hydrate. As a porous medium, the water distribution and physical properties of montmorillonite are influenced by the salt ions in seawater. In this work, the bound-water content in, and crystal structure of, montmorillonite is measured to investigate the effect of salt ions on the water distribution in montmorillonite. It can be determined from the results that the bound-water content in montmorillonite decreases as the salt-ion concentration increases. Salt ions affect the intercalation of water molecules in montmorillonite, and they then inhibit the expansion effect of montmorillonite. Next, the phase behaviors of methane hydrate in montmorillonite with NaCl solution are investigated using high-pressure micro-differential scanning calorimetry. The phase behavior of hydrate in montmorillonite with NaCl solution is discussed. In montmorillonite with NaCl solution, the phase equilibrium temperatures and the conversion rate of methane hydrate both decrease with increasing NaCl concentration. The results show that methane hydrate in montmorillonite is influenced not only by the phase-equilibrium effect of salt ions, but also by the formation effect of the salt ions on the bound-water content in montmorillonite.

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“…As known from the saline water analysis, the NaCl represented a major component, where chlorine mass represented about 16 times higher than Mg, *22 times than sulfur, *48 times than Br and K. Similarly, sodium mass represented about 9 times higher than Mg, 12 times to sulfur, 17 times to K and 180 times higher than Br and C (Wang et al 2010;Zhou et al 2014). Although the percentage of sodium chloride in seawater is much higher than other salts, their removing only from seawater does not mean that the water becomes safe to drink (Zhu et al 2014;Nguyen and Nguyen 2015).…”

Section: Introductionmentioning

confidence: 98%

Characterization and evaluation of amorphous carbon thin film (ACTF) for sodium ion adsorption

et al. 2017

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The removal of sodium ions from aqueous solutions by adsorption onto amorphous carbon thin film (ACTF) has been studied in batch mode. In this work, the ACTF as new adsorbent was synthesized based on rice straw, then its structure and properties were taken into consideration to study its ability to adsorb sodium ions from synthetic water. The influence of pH, contact time, and temperature of the ion adsorption on ACTF was also studied using batch tests. We found that the contact time of sodium adsorption and its isothermal adsorption studied were described by pseudo-second-order kinetic model and Langmuir isotherm, respectively. Our results indicated that the adsorption of sodium ions on ACTF become be stronger and depends on pH, furthermore, the maximum adsorption capacities of sodium on ACTF recorded 107, 120 and 135 mg g -1 at 35, 45, and 65°C. The thermodynamic parameters explain that the adsorption of sodium ions on ACTF is a spontaneous process and endothermic reaction. According to adsorption studies, we found that the ACTF can be used effectively for ion chromatography or desalinate sodium ion using ion exchange process in the hybrid desalination process with insignificant loss of adsorption capacity. However, the ACTF has better properties than any other carbon materials obtained from an agricultural byproduct.

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The dual effect of sodium halides on the formation of methane gas hydrate

Cited by 73 publications

References 41 publications

Unexpected inhibition of CO2 gas hydrate formation in dilute TBAB solutions and the critical role of interfacial water structure

Unexpected inhibition of CO2 gas hydrate formation in dilute TBAB solutions and the critical role of interfacial water structure

Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite

Characterization and evaluation of amorphous carbon thin film (ACTF) for sodium ion adsorption

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