Kinetics of Clathrate Hydrate Processes

Englezos, Peter; Alavi, Saman; Ripmeester, John A.

doi:10.1002/9783527695058.ch14

Cited by 4 publications

(4 citation statements)

References 261 publications

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“…A future experimental study could validate the findings in Figures 8 and 9 by observing the changes in the induction times for the onset of hydrate formation. However, it should be noted that the induction time measurements are subject to problems due to the stochastic nature of the MSZW [47]. An important aspect of the memory effect in hydrates is that, after being superheated to a certain temperature, the memory effect is erased.…”

Section: Generating the Spinodal Curve (Mszw)mentioning

confidence: 99%

Hydrate Formation with the Memory Effect Using Classical Nucleation Theory

Akkutlu,

Arslan,

Khan

2024

Crystals

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Methane hydrate formation is analytically studied in the presence of the water memory effect using the classical nucleation theory. The memory effect is introduced as a change in nucleation site from a three-dimensional heterogenous nucleation on a solid surface with cap-shaped hydrate clusters (3D-HEN) to a two-dimensional nucleation on the solid hydrate residue surface with monolayer disk-shaped hydrate clusters (2D-NOH). The analysis on the stationary nucleation of methane hydrate under isobaric conditions shows that the memory effect caused an average decrease of 4.4 K in metastable zone width, or subcooling. This decrease can be erased at higher dissociation temperatures (ΔT > 17.2 K) due to a decrease in the concentration of 2D-NOH nucleation sites. Moreover, the probability of hydrate formation is estimated for the purpose of quantifying risk associated with methane hydrate formation in the presence of the memory effect.

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Section: Generating the Spinodal Curve (Mszw)mentioning

confidence: 99%

Hydrate Formation with the Memory Effect Using Classical Nucleation Theory

Akkutlu,

Arslan,

Khan

2024

Crystals

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“…With (P(t) − P 0 (A min ) → 0, the rate of crystallite conversion with r max = 10 nm is lower and occurs at higher gas-phase potentials than the crystallite conversion rate with r max = 40 nm. The chemical potential at which phase transformation of i-th crystallite occurs can be expressed by the relationship: lnP 0 (A) i = ln P 0 (A min ) + A i lnx s cri /lnx b cri = ln P 0 (A min ) − A i K seg (37) Under the conditions where the potential P(t) >> P 0 (A min ), all crystallites can undergo a phase change (Figure 10) and the rate of crystallite conversion with r max = 10 nm is higher and occurs at lower gas-phase potentials than the crystallite conversion rate with r max = 40 nm. lnP0(A)i = ln P0(Amin) + Ailnx cri/lnx cri = ln P0(Amin) − AiK (3 Under the conditions where the potential P(t) >> P0(Amin), all crystallites can under a phase change (Figure 10) and the rate of crystallite conversion with rmax = 10 nm higher and occurs at lower gas-phase potentials than the crystallite conversion rate w rmax = 40 nm.…”

Section: Thermodynamics and Kinetics Of The System With Phase Transfo...mentioning

confidence: 99%

“…Experimental results for the reactions we obtained earlier inspired us to develop the current reaction model. Another example may be the growth of a solid clathrate hydrate phase upon exposure of ice to hydrate-forming gases, such as methane or carbon dioxide described in a scientific paper by Englezos et al [37].…”

Section: Process In the Isothermal System And The Exponential Relatio...mentioning

confidence: 99%

Kinetics and Thermodynamics of the Phase Transformation in the Nanocrystalline Substance—Gas Phase System

Arabczyk,

Pelka,

Wilk

et al. 2024

Crystals

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This study presents a model of the reaction of a nanocrystalline substance within the gas phase, where diffusion of gas reactants in the volume of the nanocrystallites is a rate-limiting step. According to the model calculations carried out, the rate of diffusion across the phase boundary located on the nanocrystallite surface limits the rate of the process. It was stated that in chemical processes with a phase transformation, the critical concentration of absorbate depends on two factors: the specific active surface area of the adsorbent and the difference in chemical potentials between the gas phase and the equilibrium potential at which the phase transformation occurs. When the actual adsorbate potential in the gas phase is much greater than the equilibrium potential of the nanocrystallite with the largest specific active surface, nanocrystallites undergo phase changes in the order according to their specific active surfaces from the largest to the smallest. In a process where the actual adsorbate potential is close to an equilibrium one, nanocrystallites undergo phase transformation in the order of their specific active surface from the smallest to the largest.

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“…CO 2 capture is an effective method to reduce the CO 2 in the atmosphere. Many capture methods, such as absorption [1], adsorption [2], membrane separation [3], hydrate-based separation [4], and cryogenic distillation [5], have been developed. The captured CO 2 can further be reutilized in many fields, such as in the production of ammonia and urea, food and beverages, refrigerants, and fire extinguishing gases [6,7].…”

Section: Introductionmentioning

confidence: 99%

Study on Carbon Fixation Ratio and Properties of Foamed Concrete

et al. 2023

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Using solid waste to sequester carbon dioxide not only reduces the greenhouse effect but also reuses resources. However, the existing solidified carbon dioxide storage materials are expensive and have poor storage effect. Therefore, in this study, cement, solid waste base material, and 30% hydrogen peroxide were used to make foamed concrete materials through chemical foaming, and XRD, BET, SEM, and thermogravimetric techniques were used to explore the amount of carbon dioxide adsorbed by foamed concrete materials under different ratio conditions. The results show that (1) the hydration products of the cementified materials mainly include C-S-H, Ht and Ca(OH)2, which are important factors for the storage of CO2. (2) A water–cement ratio of 0.7 and a foaming agent dosage of 10% are the best ratios for foamed concrete materials. With the increase of the water–cement ratio and the dosage of the foaming agent, the amount of CO2-sealed stock first increases and then decreases. (3) The maximum carbon dioxide sealing capacity of foamed concrete material is 66.35 kg/m3.

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Kinetics of Clathrate Hydrate Processes

Cited by 4 publications

References 261 publications

Hydrate Formation with the Memory Effect Using Classical Nucleation Theory

Hydrate Formation with the Memory Effect Using Classical Nucleation Theory

Kinetics and Thermodynamics of the Phase Transformation in the Nanocrystalline Substance—Gas Phase System

Study on Carbon Fixation Ratio and Properties of Foamed Concrete

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