Thermodynamic and kinetic influences of NaCl on HFC-125a hydrates and their significance in gas hydrate-based desalination

Choi, Wonjung; Lee, Yohan; Mok, Junghoon; Lee, Seungmin; Lee, Ju Dong; Seo, Yongwon

doi:10.1016/j.cej.2018.10.032

Cited by 66 publications

(34 citation statements)

References 51 publications

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“…This indicates that NaCl plays an inhibitory role in the dissolution of the gas in water. This is attributed to the ability of the Na + and Cl – ions to break the hydrogen bonds of the host water molecules that build up the cage frameworks of the hydrate structure. , …”

Section: Resultsmentioning

confidence: 99%

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF₆, HFC134a, and Their Mixture

et al. 2021

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In this study, the effects of salinity on the equilibrium and kinetics of sulfur hexafluoride (SF6), 1,1,1,2-tetrafluoroethane (HFC134a), and their mixture were evaluated to analyze their potential applications to hydrate-based desalination. The equilibrium pressure of the mixture gas (SF6/HFC134a) was lower than that of pure SF6 gas but higher than that of pure HFC134a gas. The thermodynamic effects of various concentrations (0, 3.5, 5, and 8 wt %) of NaCl on the gas hydrates were evaluated. Experiments were performed on the formation kinetics in the presence of NaCl solution at the same experimental temperature and pressure (274.15 K and 0.70 MPa). The hydrate growth rates decreased with increasing NaCl concentration. The rates also declined with time, associated with the inhibition of mass transfer between the gas and the liquid. During hydrate formation, the vapor compositions of the mixture gas were analyzed by in situ Raman spectroscopy and the results were consistent with those obtained by gas chromatography. Furthermore, an in situ Raman spectroscopic analysis demonstrated that the SF6 and HFC134a molecules occupy only the large cage (51264) of the structure II (sII) hydrate during SF6/HFC134a formation and the addition of salt did not change the structure of the SF6 and HFC134a hydrates. The hydrate phase behavior and kinetic results of this study can serve as foundational data for hydrate-based desalination technology and fluorinated gases separation and recovery processes.

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Section: Resultsmentioning

confidence: 99%

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF₆, HFC134a, and Their Mixture

et al. 2021

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“…Consequentemente, é necessário aprimorar essas tecnologias já existentes e também implementar novas tecnologias que permitam desenvolver processos mais eficientes a menores custos (PARK et al, 2011;KANG et al, 2014;XU et al, 2018;FAKHARIAN et al, 2017;CHOI et al, 2019).…”

Section: Conclusãounclassified

Aplicação Da Robótica Na Monitoração Ambiental

Ramírez¹,

Oliveira²,

Fernandes³

2019

A Preservação Do Meio Ambiente E O Desenvolvimento Sustentável

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“…Gas hydrate materials exist in three different crystal structures and are formed by water and more than 100 other molecules at suitable temperature and high pressure conditions. − Several technological applications have been associated with gas hydrates as well as a link to past and future climate changes . For example, gas hydrate based technology can be potentially used for gas storage and transportation, , mixed gas separation, − desalination, , and CO 2 capture. − The commercial implementation of CO 2 capture based on gas hydrates requires mild conditions (low pressure and high temperature). Such conditions are accomplished when a small amount of thermodynamic promoters is used.…”

Section: Introductionmentioning

confidence: 99%

“…1−3 Several technological applications have been associated with gas hydrates as well as a link to past and future climate changes. 4 For example, gas hydrate based technology can be potentially used for gas storage and transportation, 5,6 mixed gas separation, 7−9 desalination, 10,11 and CO 2 capture. 12−17 The commercial implementation of CO 2 capture based on gas hydrates requires mild conditions (low pressure and high temperature).…”

Section: Introductionmentioning

confidence: 99%

A Calorimetric Study on the Phase Behavior of Tetra-n-butyl Phosphonium Bromide + CO₂ Semiclathrate Hydrate and Evaluation of CO₂ Consumption─Impact of a Surfactant

Xie

Zhong

et al. 2021

J. Chem. Eng. Data

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This work presents data on the phase behavior of tetra-n-butyl phosphonium bromide (TBPB) semiclathrate hydrate formed in the presence of CO 2 at a stoichiometric concentration (2.57 mol % TBPB). A high pressure microdifferential scanning calorimeter (HP μ-DSC) was employed to measure the phase equilibrium data and identify the dissociation behaviors of TBPB + CO 2 semiclathrate hydrate. It was found that the phase equilibrium conditions for TBPB + CO 2 semiclathrate hydrate formed at 2.57 mol % TBPB were lower than CO 2 hydrate formed in pure water and TBPB + CO 2 semiclathrate hydrate formed at 0.5 mol % TBPB. The coexistence of CO 2 hydrate (sI) and TBPB + CO 2 semiclathrate were identified in the 2.57 mol % TBPB solution. When adding 500 ppm sodium dodecyl sulfate (SDS) into the 2.57 mol % TBPB solution, CO 2 hydrate disappeared and more TBPB + CO 2 semiclathrate hydrate was formed. However, under the same temperature and pressure conditions, CO 2 consumption during the formation of TBPB + CO 2 semiclathrate hydrate was reduced when 500 ppm of SDS was added to the 2.57 mol % TBPB solution. Therefore, future work should aim to increase the CO 2 storage capacity of TBPB semiclathrate hydrate.

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Thermodynamic and kinetic influences of NaCl on HFC-125a hydrates and their significance in gas hydrate-based desalination

Cited by 66 publications

References 51 publications

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF₆, HFC134a, and Their Mixture

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF₆, HFC134a, and Their Mixture

Aplicação Da Robótica Na Monitoração Ambiental

A Calorimetric Study on the Phase Behavior of Tetra-n-butyl Phosphonium Bromide + CO₂ Semiclathrate Hydrate and Evaluation of CO₂ Consumption─Impact of a Surfactant

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Thermodynamic and kinetic influences of NaCl on HFC-125a hydrates and their significance in gas hydrate-based desalination

Cited by 66 publications

References 51 publications

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF6, HFC134a, and Their Mixture

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF6, HFC134a, and Their Mixture

Aplicação Da Robótica Na Monitoração Ambiental

A Calorimetric Study on the Phase Behavior of Tetra-n-butyl Phosphonium Bromide + CO2 Semiclathrate Hydrate and Evaluation of CO2 Consumption─Impact of a Surfactant

Contact Info

Product

Resources

About

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF₆, HFC134a, and Their Mixture

Effects of Salinity on Hydrate Phase Equilibrium and Kinetics of SF₆, HFC134a, and Their Mixture

A Calorimetric Study on the Phase Behavior of Tetra-n-butyl Phosphonium Bromide + CO₂ Semiclathrate Hydrate and Evaluation of CO₂ Consumption─Impact of a Surfactant