Dissociation Behavior of Pellet-Shaped Methane−Ethane Mixed Gas Hydrate Samples

Kawamura, Taro; Ohga, Kotaro; Higuchi, Kiyoshi; Yoon, Jinsu; Yamamoto, Yoshitaka; Komai, Takeshi; Haneda, Hironori

doi:10.1021/ef020174x

Cited by 34 publications

(19 citation statements)

References 15 publications

(29 reference statements)

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“…For the final regasification of manufactured hydrates involving thermal stimulation, the decomposition rate is controlled by the heat transfer rate from the heat source to the dissociating hydrate [22][23][24]. The dominant mode of the heat transfer in regasifiers is considered to be multiphase convection, which may contain three solid/liquid/gas phases or four solid/liquid/ liquid/gas phases in the presence of nonaqueous LMGS.…”

Section: Introductionmentioning

confidence: 99%

Static Formation and Dissociation of Methane+Methylcyclohexane Hydrate for Gas Hydrate Production and Regasification

Liang

et al. 2011

Chem Eng & Technol

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The formation and decomposition of methane+methylcyclohexane (MCH) hydrate in a static batch reactor, which was also designed as a high-pressure microwave reactor, were investigated. The addition of 300 ppm sodium dodecyl sulfate (SDS) provides continuous formation of CH 4 +MCH hydrate under static conditions. Increasing the initial pressure within the narrow range of 2.7 to 4.6 MPa at 274 K enhances the formation rate by even several times. The gas storage capacity can be largely improved with partial coexisting of sI CH 4 hydrate. Unlike a stirred formation, an increase of nonaqueous MCH inhibits the static formation of sH hydrate. The following regasification by 2.45 GHz microwave heating indicates that the dissociation is rate-controlled by the parallel connection of efficient internal heating and conventional external heating. The multiphase convection characterized by osmotic dehydration and driven by intensified regasification is considered as the dominant mechanism affecting the quiescent dissociation.

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Section: Introductionmentioning

confidence: 99%

Static Formation and Dissociation of Methane+Methylcyclohexane Hydrate for Gas Hydrate Production and Regasification

Liang

et al. 2011

Chem Eng & Technol

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“…Figure 2 shows the experimental set-up of ice-gas interface method to produce pure artificial methane hydrate (MH) 5,6 . With experimental data, λ can be determined by parameter fitting so as to achieve the linear relationship between ΔT avg and D (τ).…”

Section: Methodsmentioning

confidence: 99%

Estimation of Thermal Properties of Methane Hydrate Sediment

et al. 2008

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Thermal conductivity of real hydrate-layer sand grain, which was recovered from the sediment under sea bottom near Japan, was measured with hot-disc transient method. That of Toyoura standard sand was also measured for comparison. Thermal conductivity of natural methanehydrate-layer sand was 3.8 ~ 5.8 [W/mK] at measured condition (263K~283K, 0.1MPa). This value was lower than that of Toyoura standard sand (8.6 ~ 9.4 [W/mK]) at the same condition. Thermal conductivities of the natural hydrate-layer sand grain and artificial methane hydrate (MH) mixtures were also measured at the condition that imitated the real circumstances of sediment under sea bottom (278K, 10MPa,water saturated). The value was remarkably decreased with the increase of MH concentration at 0vol% ~40vol%. While, it was not so much changed at higher than 40vol%. Estimation of thermal conductivity of natural sand-MH-water three component mixtures was carried out. As a result, the series-parallel conjugation model with varying the contribution parameter reproduced measured values correctly. This is consistent with the idea that structure of measured sand-MH mixed samples should be changed around 40vol% of MH.

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“…s v d,1 eq g 1 (15) Equations 12−14 are derived from a population balance, in which it is assumed that there is no breakage or agglomeration during the decomposition. 2 The initial values of the zeroth, first, and second moments of the particle size distribution are inferred from the experimental measurement of the chord length distribution, which occurs during the stabilization period.…”

Section: ■ Theorymentioning

confidence: 99%

Stoichiometric Approach toward Modeling the Decomposition Kinetics of Gas Hydrates Formed from Mixed Gases

Giraldo¹,

Clarke

2013

Energy Fuels

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Following a recent study by Giraldo et al. (Giraldo, C.; Maini, B.; Bishnoi, P. R. A simplified approach to modeling the rate of formation of gas hydrates formed from mixtures of gases. Energy Fuels 2013, 27, 1204−1211), in which a new stoichiometry-based approach was taken to model the rate of gas hydrate formation for mixed gases, a new stoichiometric approach has been proposed to describe the kinetics of gas hydrate decomposition from mixed gases. Similar to the model of gas hydrate formation by Giraldo et al., the newly proposed model of gas hydrate decomposition has the advantage that the intrinsic rate constant of gas hydrate decomposition is only required for a single component. To test the model, gas hydrate decomposition experiments were conducted in a semi-batch stirred-tank reactor, equipped with an in situ particle size analyzer, to study the rate of decomposition of gas hydrates formed from mixtures of carbon dioxide and methane. Two gas mixtures of CO 2 (1) + CH 4 (2), one with x 1 = 0.4 and the other with x 1 = 0.6, were used for the current study. The experimental temperatures ranged from 274 to 276 K, and the experimental pressures ranged from 16 to 22 bar. The new approach was used to model the kinetics of gas hydrate decomposition, and the results from these predictions were compared to the results obtained using the model by Clarke and Bishnoi (Clarke, M. A.; Bishnoi, P. R. Measuring and modelling the rate of decomposition of gas hydrates formed from mixtures of methane and ethane. Chem. Eng. Sci. 2001, 56, 4715−4724 and Clarke, M. A.; Bishnoi, P. R. Determination of the intrinsic rate constant and activation energy of CO 2 gas hydrate decomposition using in-situ particle size analysis. Chem. Eng. Sci. 2004, 59, 2983−2993. The root-mean-square of the relative errors between the predictions of the new model and the model by Clarke and Bishnoi are 4.15 and 6.21%, respectively. Further validation of the new model was performed using it to fit the data by Clarke and Bishnoi on the decomposition of both sI and sII gas hydrates formed from mixtures of CH 4 (1) + C 2 H 6 (2). When applied to these data sets, the root-mean-square of the relative errors between the predictions of the new model and the model by Clarke and Bishnoi are 2.58 and 1.60%, respectively.

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Dissociation Behavior of Pellet-Shaped Methane−Ethane Mixed Gas Hydrate Samples

Cited by 34 publications

References 15 publications

Static Formation and Dissociation of Methane+Methylcyclohexane Hydrate for Gas Hydrate Production and Regasification

Static Formation and Dissociation of Methane+Methylcyclohexane Hydrate for Gas Hydrate Production and Regasification

Estimation of Thermal Properties of Methane Hydrate Sediment

Stoichiometric Approach toward Modeling the Decomposition Kinetics of Gas Hydrates Formed from Mixed Gases

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