Kinetics of structure II gas hydrate formation for propane and ethane using an in-situ particle size analyzer and a Raman spectrometer

Alotaibi, Faisal M.; Clarke, Matthew A.; Maini, Brij B.; Bishnoi, P. R.

doi:10.1016/j.ces.2011.03.012

Cited by 24 publications

(24 citation statements)

References 20 publications

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“…This two-step mechanism was confirmed for methane-propane gas hydrates as well as methane-ethane gas hydrates [64]. Regarding an ethane-propane gas mixture, Al-Otaibi et al discovered that there is a dependency on the gas composition, that is, which gas hydrate structure, either sI or sII, is formed [65]. There was a shift from structure sII to sI at an ethane mole fraction of 0.73.…”

Section: Natural Gas Separationmentioning

confidence: 88%

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Filarsky¹,

Wieser²,

Schultz³

2021

Molecules

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Gas hydrates show great potential with regard to various technical applications, such as gas conditioning, separation and storage. Hence, there has been an increased interest in applied gas hydrate research worldwide in recent years. This paper describes the development of an energetically promising, highly attractive rapid gas hydrate production process that enables the instantaneous conditioning and storage of gases in the form of solid hydrates, as an alternative to costly established processes, such as, for example, cryogenic demethanization. In the first step of the investigations, three different reactor concepts for rapid hydrate formation were evaluated. It could be shown that coupled spraying with stirring provided the fastest hydrate formation and highest gas uptakes in the hydrate phase. In the second step, extensive experimental series were executed, using various different gas compositions on the example of synthetic natural gas mixtures containing methane, ethane and propane. Methane is eliminated from the gas phase and stored in gas hydrates. The experiments were conducted under moderate conditions (8 bar(g), 9–14 °C), using tetrahydrofuran as a thermodynamic promoter in a stoichiometric concentration of 5.56 mole%. High storage capacities, formation rates and separation efficiencies were achieved at moderate operation conditions supported by rough economic considerations, successfully showing the feasibility of this innovative concept. An adapted McCabe-Thiele diagram was created to approximately determine the necessary theoretical separation stage numbers for high purity gas separation requirements.

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Section: Natural Gas Separationmentioning

confidence: 88%

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Filarsky¹,

Wieser²,

Schultz³

2021

Molecules

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“…(F) ,, , 46,53 ). In the case of high i k , permeation can play a role as the limiting phenomena, and therefore we test sensitivity on  -parameter.…”

Section: Outer Growth Vs Crystallization In Capillaries: Influence Omentioning

confidence: 99%

A Multiscale Approach for Gas Hydrates Considering Structure, Agglomeration, and Transportability under Multiphase Flow Conditions: II. Growth Kinetic Model

Bassani

Sum

Herri

et al. 2020

Ind. Eng. Chem. Res.

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In the second part of this series, we introduce the mathematical model for the growth kinetics of gas hydrates in oil continuous flow. Mathematical description of the capillary filling-up process is given (porosity evolution), coupled with growth phenomena already described in the literature (gas absorption by the oil bulk, mass transfer particle/bulk, outer growth due to permeation). The range of closure parameters reported in the literature for CH 4 hydrates is used to understand the limiting steps of crystallization, the evolution of porosity being the controlling factor in the asymptotic trend of the gas consumed over time. Furthermore, gas absorption by the bulk and mass transfer particle/bulk is shown to be negligible for oil-continuous flow when considering a gas that is much more soluble in oil than in water. The model is simplified for engineering purposes, giving rise to an explicit semi-empirical equation for the gas consumption rate because of hydrate formation based on two independent parameters that are experimentally regressed. A criterion for the existence of wet or dry particles (the water layer covering the particles in oilcontinuous flow) is proposed in means of the competition of crystal integration in the outer surface versus water permeation through the porous hydrate.

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“…However, the model does not describe the local hydrate stability during crystallization as a consequence of the crystallization itself, which instead needs to be assumed independently. Neither the papers of Englezos et al [13,14] are clear on that point, nor more recent work [16] that has inherited features from the model of Englezos et al [13,14]. The authors [16] state that the hydrate composition is calculated by using a particular software (MEGHA software) without giving a detailed description of the vector of mole fractions of the guest molecules…”

Section: Discussionmentioning

confidence: 99%

Derivation of a Langmuir type of model to describe the intrinsic growth rate of gas hydrates during crystallisation from gas mixtures

Herri

Kwaterski

2012

Chemical Engineering Science

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International audienceGas hydrates are crystalline water based solids composed of a three-dimensional network of water molecules. They form a network of cavities in which molecules of light gases can be encapsulated depending on their size and affinity. Gas hydrates can, by their nature, not be classified as chemical compounds since they do not possess a definite stoechiometry. In contrast they have to be regarded as solid solution phases, the stoechiometry of which is not fixed but depends on the composition of the surrounding liquid. At equilibrium, the composition dependence of the hydrate phase can be described by means of the classical van der Waals and Platteeuw model (van der Waals and Platteeuw, 1959). In the framework of the model, Langmuir constants are used for expressing the relative ability of light components to get enclathrated within the cavities. The work consists in considering again the enclathration of host species, not at thermodynamic equilibrium, but during the crystallisation process taking place under non-equilibrium conditions. It aims at proposing a new formulation for the hydrate composition as a function of new intrinsic constants which are based on Langmuir kinetic constants

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Kinetics of structure II gas hydrate formation for propane and ethane using an in-situ particle size analyzer and a Raman spectrometer

Cited by 24 publications

References 20 publications

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

A Multiscale Approach for Gas Hydrates Considering Structure, Agglomeration, and Transportability under Multiphase Flow Conditions: II. Growth Kinetic Model

Derivation of a Langmuir type of model to describe the intrinsic growth rate of gas hydrates during crystallisation from gas mixtures

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