A new approach for determination of single component gas hydrate formation kinetics in the absence or presence of kinetic promoters

ZareNezhad, Bahman; Mottahedin, Mona; Varaminian, Farshad

doi:10.1016/j.ces.2015.06.033

Cited by 11 publications

(7 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The population base model described via eqs – and schematically depicted via the flow chart represented in Figure is solved by resorting to the combinatory method of the Lax–Wendroff/Crank–Nicolson technique to provide the hydrate formation rate for the experimental case studies borrowed from Englezos et al The kinetic rate constants shown in Table are used in the entire simulations to predict the nucleation and growth rates via eqs and . As described in more detail in previous works, the experimental data extracted from Figure are used along with a trial and error procedure to minimize the sum of squares of the prediction errors and estimate the appropriate values of k r and k b , for the given data set.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Similar to the Herri and Kwaterski Langmuir type model, many system parameters such as driving force and free energy change were expressed in terms of liquid phase composition . They surprisingly concluded that “kinetic rate constant which is the only adjustable parameter of the proposed model is a weak function of the temperature and a strong function of the surfactant concentration” …”

Section: Introductionmentioning

confidence: 99%

“…In a relatively comprehensive study, ZareNezhad et al have experimentally and theoretically investigated the kinetics of gas hydrate formation processes for pure methane, ethane, and carbon dioxide at isochoric and isobaric conditions in the presence and absence of kinetic additives . A combination of growth rate and mass transfer around the hydrate particles was used.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of Population Balance Theory for Dynamic Modeling of Methane and Ethane Hydrate Formation Processes

Khatami

Shahsavand

2018

Energy Fuels

View full text Add to dashboard Cite

Natural gas hydrates are considered as a promising fuel source in the relatively near future. Kinetic modeling of various steps of the natural gas hydrate formation process, such as dissolution, nucleation, and growth processes, has received numerous attentions. A novel mechanism is introduced for the entire nucleation and growth steps, and a proper mathematical model is presented to estimate the gas consumption rate in a constant temperature and pressure process. The proposed model covers the entire dissolution, nucleation, and growth stages. The combined Lax–Wendroff/Crank–Nicolson method is employed to solve the population balance equation for estimation of total surface area of evolved hydrate particles and corresponding particle size distributions. A special class of artificial neural network (known as the Regularization Network) is used to predict the solid–liquid equilibria. The proposed model is successfully validated using experimental data borrowed from the literature for both methane and ethane hydrate formation processes. The simulation results indicate that, for both methane and ethane species, the mole fractions in the bulk of liquid are often close to the corresponding concentrations at solid–liquid interfaces and decrease over the time during hydrate growth processes. It is clearly demonstrated that the overall resistance shifts from the nucleation reaction to mass transfer as the hydrate formation progresses.

show abstract

Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of Population Balance Theory for Dynamic Modeling of Methane and Ethane Hydrate Formation Processes

Khatami

Shahsavand

2018

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Os diagramas de equilíbrio de fases podem construídos a partir de dados experimental ou a partir de modelos preditivos. Existem vários modelos termodinâmicos propostos na literatura que tem como intuito determinar as condições de equilíbrio para a formação dos hidratos (SLOAN e KOH, 2008;SFAXI et al, 2012;KANG e LEE, 2000;ZARENEZHAD et al, 2015;MA et al, 2016;IDRESS, et al, 2018).…”

Section: Estabilidade Dos Hidratos De Gásunclassified

Avaliação Da Eficácia Da Biorremediação Em Termos De Remoção Da Ecotoxicidade Associada Ao Sedimento Sema

Gonçalves¹,

Almeida²,

Quintella³

et al. 2019

A Preservação Do Meio Ambiente E O Desenvolvimento Sustentável

View full text Add to dashboard Cite

show abstract

“…A very noticeable reduction in dissociation temperature with 25% nitrogen occurs as a result of significant dilution and reduction of methane partial pressure. As the nitrogen content is increased, a lower composition of methane exists in the liquid phase and therefore resulting in the reduction of the equilibrium temperature (ZareNezhad et al 2015). Contrary to nitrogen hydrates, carbon dioxide hydrates form and dissociate at higher temperatures.…”

Section: Fig5 -Dissociation Temperature Profile For Carbon Dioxide Imentioning

confidence: 99%

Gas hydrate formation and dissociation numerical modelling with nitrogen and carbon dioxide

Smith

Barifcani

Pack³

2015

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

This work aims at providing experimental data for various methane-based hydrates, namely nitrogen and carbon dioxide gas mixtures with varying concentrations to provide an empirically based hydrate equilibrium model. Acquired using a sapphire pressurevolumetemperature (PVT) cell, this data is used as the foundation for the derivation of a model able to calculate the equilibrium temperature of a nitrogen and/or carbon dioxide diluted methane gas is accomplished. There are several theoretical predictive models used in software which can provide hydrate formation and equilibrium data, however theoretical models appear to outnumber experimental data and empirical models for which a comparison can be made.The effect of nitrogen and carbon dioxide, an inhibitor and promotor respectively, on methane hydrate formation and dissociation and their associated pressure and temperature conditions are explored. The hydrate profiles for various gas mixtures containing the gases mentioned are presented at pressures ranging between 40-180 bara. These hydrate profiles and the model presented were compared to those predicted by hydrate computational software and experimental data from other studies for verification. The derived model proved to be reliable when applied to various gas mixtures at different pressure conditions and was consistent when compared to computational software based on theoretical models.Consistency of methane hydrate formation data was compared to dissociation data proved that the formation temperature is not an accurate representation of the equilibrium temperature. A simple statistical measure revealed the dissociation temperature measurements to be more precise and agreed to a much larger degree with literature.

show abstract

A new approach for determination of single component gas hydrate formation kinetics in the absence or presence of kinetic promoters

Cited by 11 publications

References 28 publications

Application of Population Balance Theory for Dynamic Modeling of Methane and Ethane Hydrate Formation Processes

Application of Population Balance Theory for Dynamic Modeling of Methane and Ethane Hydrate Formation Processes

Avaliação Da Eficácia Da Biorremediação Em Termos De Remoção Da Ecotoxicidade Associada Ao Sedimento Sema

Gas hydrate formation and dissociation numerical modelling with nitrogen and carbon dioxide

Contact Info

Product

Resources

About