High-pressure gas hydrate autoclave hydraulic experiments and scale-up modeling on the effect of stirring RPM effect

Qureshi, M. Fahed; Altamash, Tausif; Aparício, Santiago; Aminnaji, Morteza; Tohidi, Bahman

doi:10.1016/j.jngse.2016.12.023

Cited by 54 publications

(31 citation statements)

References 39 publications

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“…The mode of operation of kinetic promoters, essentially surfactants, is based on accelerating gas hydrate formation by reducing the surface tension, which leads to improved mass transport of gas into the liquid phase [36]. An alternative approach to improving hydrate formation is apparatus engineering measures, for instance, by using a stirred [37][38][39], packed bed [37,40,41], bubble column [42,43] or spray reactor design [44,45]; this investigation focuses on the latter approach.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Filarsky¹,

Wieser²,

Schultz³

2021

Molecules

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“…Thermodynamic promoters, such as tetrahydrofuran (THF), for example, enable gas hydrate formation at higher temperatures and lower pressures, as they are capable of forming hydrates on their own while stabilizing gas hydrates of other species. , Kinetic promoters, mainly surfactants, such as sodium dodecyl sulfate (SDS), accelerate gas hydrate formation. , For example, Zhong and Rogers discovered that, at SDS concentrations above the CMC, gas hydrate formation rates in quiescent systems are significantly higher than those in pure water . Recently, growing interest in amino acids has been recognized as well in this context. , Another approach to enhance hydrate formation is to take apparatus-based technical measures, for example, by using stirred, , spray, , bubble column, , or packed-bed , reactor designs, and this work focuses on the last approach.…”

Section: Introductionmentioning

confidence: 99%

Impact of Modified Silica Beads on Methane Hydrate Formation in a Fixed-Bed Reactor

Filarsky

Schmuck

Schultz

2019

Ind. Eng. Chem. Res.

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The work deals with the optimization of methane hydrate storage in fixed-bed reactor systems made up of modified silica beads. Under transient conditions, rapid hydrate growth is achieved at 4 °C. Glass beads are modified via silanization and treated with peroxymonosulfuric acid. It is proven that the fixed-bed surface properties significantly determine the gas hydrate growth and final gas uptake and therefore determine the successful technical design of the system. The capillary pressure is calculated in each bed configuration and is set in relation to the overall gas uptake. A negative capillary pressure leads to a holdback of water in the fixed-bed system. A high water-to-hydrate conversion is obtained for an untreated fixed bed with a positive capillary pressure. In the presence of SDS, the capillary effects are negated by the kinetic promotion effects. An inhibiting behavior is observed when using hydrophilic beads after treatment with peroxymonosulfuric acid.

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“…The hydrate induction has been defined in different ways based on their measurement techniques 58,59 . In this work, the hydrate induction or formation time is taken as the point where a sharp pressure decline occurs 60 . The detailed calculation procedure for the hydrate induction time has been reported in previous studies 52,54 .…”

Section: Methodsmentioning

confidence: 99%

Experimentally measured methane hydrate phase equilibria and ionic liquids inhibition performance in Qatar’s seawater

Qureshi

Khraisheh

Almomani

2020

Sci Rep

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Qatar has the third-largest natural gas reserves in the world and is the second largest Liquefied natural gas (LNG) exporter in the world. These reserves are mainly located in its offshore North Field where the gas is extracted, transported to the onshore units, and is converted to LNG for international export. The formation of natural gas hydrates in the offshore subsea lines can cause unwanted blockages and hinder the smooth supply of gas supply from offshore to onshore units. In the present work, the formation and dissociation of methane gas hydrates have been studied in the ultra pure water system (UPW), artificial seawater (ASW), and Qatar seawater (QSW) at different conditions (4–10 MPa) using standard rocking cell rig. The naturally occurring seawater was collected from Ras Laffan seacoast located in Doha, Qatar. The seawater sample was examined for elemental analysis (SO4, Cl, Na, Ca, Mg, K, and Fe) using inductively coupled plasma atomic emission spectroscopy (ICP-AES) technique and its other properties like density, electrical conductivity, and pH were also measured. The experimental results show that the CH4 pure water HLVE curve is suppressed by about 3 K in Qatar seawater and 2 K in artificial seawater. The hydrate inhibition strength of the Ionic liquids (ILs) salts 3-Ethyl-1-methyl-1H-imidazol-3-ium methane-sulfonate [C7H14N2O3S] and 3-Ethyl-1-methyl-1H-imidazol-3-ium dicyanoazanide [C8H11N5] was evaluated in both the ultra pure water and Qatar seawater systems. Their performance was compared with methanol and other ILs salts reported in the literature. The selected ILs exhibited poor hydrate inhibition effect in the ultra pure water systems, but they show a noticeable thermodynamic and kinetic hydrate inhibition effect in the Qatar seawater system. The computational 3D molecular models of ILs and methanol were generated to cognize the plausible hydrate inhibition mechanism in the presence of these inhibitors.

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High-pressure gas hydrate autoclave hydraulic experiments and scale-up modeling on the effect of stirring RPM effect

Cited by 54 publications

References 39 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

Impact of Modified Silica Beads on Methane Hydrate Formation in a Fixed-Bed Reactor

Experimentally measured methane hydrate phase equilibria and ionic liquids inhibition performance in Qatar’s seawater

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