Sodium alginate polymer as a kinetic inhibitor of methane hydrate formation

Silva, Bárbara Louise Lemos Drumond; Ferraz, Isabella Leite; Nascimento, Dênis Fernandes do; Castro, José Adilson de; Vitorazi, Letícia

doi:10.1016/j.jmrt.2021.03.074

Cited by 20 publications

(6 citation statements)

References 38 publications

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“…for the entire growth period are less than 1 for all conditions, inferring instantaneous one-dimensional crystal growth followed by a decrease in hydrate nucleation and growth rates that could be attributed to the mass transfer resistance. Similar low exponent values were also reported by Susilo et al [617], Luzi et al [616], Silva et al [632]. The corresponding AAD values are presented in A4.2.…”

Section: Kinetic Analysissupporting

confidence: 88%

Methane and hydrogen storage in clathrate hydrates

Nithin Bharadwaj

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Section: Kinetic Analysissupporting

confidence: 88%

Methane and hydrogen storage in clathrate hydrates

Nithin Bharadwaj

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“…Thus, the crystallization rate constant k of the free water is 2.97 × 10 –6 s –1 at 273 K. Such kinetics of the free water component in the presence of KHIs have not been obtained previously using the NMR method. The rate constant obtained here is 2 orders of magnitude lower than that of methane hydrate formation in water without an inhibitor at 253 K and 1 to 2 orders of magnitude lower than that of methane hydrate formation in water with a sodium alginate inhibitor at 277 K . The slope of the fitting line in Figure being close to 1.0 indicates that the hydrate was formed from liquid water without diffusion resistance .…”

Section: Resultsmentioning

confidence: 55%

“…Thus, the crystallization rate constant k of the free water is 2.97 × 10 −6 s −1 at 273 K. Such kinetics of the free water component in the presence of KHIs have not been obtained previously using the NMR method. The rate constant obtained here is 2 orders of magnitude lower than that of methane hydrate formation in water without an inhibitor at 253 K 66 and 1 to 2 orders of magnitude lower than that of methane hydrate formation in water with a sodium alginate inhibitor at 277 K. 69 The slope of the fitting line in Figure 4 being close to 1.0 indicates that the hydrate was formed from liquid water without diffusion resistance. 66 Therefore, hydrate nucleation occurs in the free water, and subsequently, the free water component in the solution with PVCap crystallizes at a very slow rate in partially restricted mobility while the bound water species increases, where the polymer/water interface acts as the reaction center.…”

Section: ■ Results and Discussionmentioning

confidence: 56%

Unraveling Amphiphilic Poly(N-vinylcaprolactam)/Water Interface by Nuclear Magnetic Resonance Relaxometry: Control of Clathrate Hydrate Formation Kinetics

Wang

Kelland

et al. 2022

Langmuir

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Water-soluble amphiphilic polymers are vital chemicals in the oil and gas industry to retard crystal growth of hydrocarbon hydrate via surface adsorption and suppress nucleation of a pristine hydrate nucleus, thereby preventing formation of hydrate blockages in flow lines during oil and natural gas production. Apart from a few theoretical modeling studies, an experimental method to study the polymer/water interface in the crystal growth is critically needed. Here, water motions in the hydration shells of an exemplary kinetic inhibitor, poly(N-vinylcaprolactam), during hydrate formation from the tetrahydrofuran/water system are revealed via nuclear magnetic resonance relaxometry. Unequivocal experiments show that the pivotal interfacial water in the tightly bound state gradually freezes at rates depending on the polymer molecular weight (MW). This is supported by nonfreezable water analysis, which is correlated to the inhibition time. The polymers tune the kinetics of the hydration process via interaction with and perturbation of the water molecules. The free water component in the polymer solution crystallizes at a very slow rate when in partially restricted mobility, whereas the bound water component increases in the reaction, with the polymer/water interface serving as the reaction sites. The appropriate MW (including average MW and polydispersity values) of the inhibitive polymers can give rise to maximal retardation of the hydrate crystal growth. This work will help control other multiphase crystallization kinetic processes through the design of inhibitors or promoters functioning in the interface.

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“…Similar low Avrami exponent values for hydrate growth were also reported by other researchers. 77,95,96 Conclusively, the predictive power of the JMAK model revealed limitations in evaluating the hydrate growth at both the beginning or later stages of the growth kinetics.…”

Section: Resultsmentioning

confidence: 99%

Surface modification of mesostructured cellular foam to enhance hydrogen storage in binary THF/H₂ clathrate hydrate

Kummamuru,

Ciocarlan,

Houlleberghs

et al. 2024

Sustainable Energy Fuels

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show abstract

Sodium alginate polymer as a kinetic inhibitor of methane hydrate formation

Cited by 20 publications

References 38 publications

Methane and hydrogen storage in clathrate hydrates

Methane and hydrogen storage in clathrate hydrates

Unraveling Amphiphilic Poly(N-vinylcaprolactam)/Water Interface by Nuclear Magnetic Resonance Relaxometry: Control of Clathrate Hydrate Formation Kinetics

Surface modification of mesostructured cellular foam to enhance hydrogen storage in binary THF/H₂ clathrate hydrate

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Sodium alginate polymer as a kinetic inhibitor of methane hydrate formation

Cited by 20 publications

References 38 publications

Methane and hydrogen storage in clathrate hydrates

Methane and hydrogen storage in clathrate hydrates

Unraveling Amphiphilic Poly(N-vinylcaprolactam)/Water Interface by Nuclear Magnetic Resonance Relaxometry: Control of Clathrate Hydrate Formation Kinetics

Surface modification of mesostructured cellular foam to enhance hydrogen storage in binary THF/H2 clathrate hydrate

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Surface modification of mesostructured cellular foam to enhance hydrogen storage in binary THF/H₂ clathrate hydrate