Clathrate hydrate formation in NaCl and MgCl2 brines at low pressure conditions

Woo, Yesol; Lee, Chang-Ho; Jeong, Jae Hak; Kim, Dong-Seon; Lee, Jun Young; Yamamoto, Yoshitaka; Park, Jae Sung; Cha, Minjun; Yoon, Ji-Ho

doi:10.1016/j.seppur.2018.07.015

Cited by 31 publications

(19 citation statements)

References 59 publications

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“…x H,max shows a linear decline with the effective mole fraction of the dissolved salt. This is in agreement with previous works, in which the maximum gas uptake decreased with increasing salt concentration 8 , 9 or was lower in comparison to pure water 11 , 39 , 45 but without significant dependence on the mass fraction of the salt.…”

Section: Resultssupporting

confidence: 93%

“… 33 Strong agitation of the system can overcome mass transfer limitation. 8 , 34 For a relatively small reactor with sufficient cooling, the heat transfer limitation does not affect the growth kinetics significantly. 8 Therefore, the gas hydrate growth can be expressed as a first-order reaction.…”

Section: Resultsmentioning

confidence: 99%

“… 8 , 34 For a relatively small reactor with sufficient cooling, the heat transfer limitation does not affect the growth kinetics significantly. 8 Therefore, the gas hydrate growth can be expressed as a first-order reaction. Other authors correlated the pressure of the system 8 , 34 or the concentration of CO 2 35 with the growth kinetics.…”

Section: Resultsmentioning

confidence: 99%

“… 8 Therefore, the gas hydrate growth can be expressed as a first-order reaction. Other authors correlated the pressure of the system 8 , 34 or the concentration of CO 2 35 with the growth kinetics. As our experiments give direct information about the molar fraction of hydrate x H with time t , we can write with the maximum molar fraction at the end of growth x H,max and the reaction constant r .…”

Section: Resultsmentioning

confidence: 99%

“…Another widely discussed topic in gas hydrate research is whether salts influence the kinetics of hydrate formation. Woo et al 8 studied the formation of R22 gas hydrates in NaCl and MgCl 2 brines. In their experiments, both the growth constant and the overall gas uptake were significantly influenced by the presence of salts.…”

Section: Introductionmentioning

confidence: 99%

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Raman Spectroscopic Study of the Effect of Aqueous Salt Solutions on the Inhibition of Carbon Dioxide Gas Hydrates

Holzammer

Braeuer

2019

J. Phys. Chem. B

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We present an experimental Raman study on the thermodynamic inhibition effect of different salts (NaCl, KCl, MgCl2, and CaCl2 from 2.5 to 11 wt %) on the formation of carbon dioxide gas hydrates. We performed the experiments in a high-pressure vessel with two phases: a water-rich phase and a CO2-rich phase. We investigated the changes the inhibitors induce in the water-rich phase before the onset of hydrate formation. This includes a study of the change in molar reaction enthalpy between strongly and weakly hydrogen-bonded water and the decrease in solubility of carbon dioxide in water. Additionally, the growth mechanisms of carbon dioxide hydrates were investigated by determining the amount of solid hydrates formed and the reaction constant. The results show that the molar reaction enthalpy, the solubility of CO2, and the amount of solid hydrates formed can be correlated with the effective mole fraction, whereas the reaction constant is not affected by the addition of salts. The decrease of the molar reaction enthalpy can be directly correlated with the equilibrium temperature of the gas hydrates.

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