Kinetic and thermodynamic behaviour of CF 4 clathrate hydrates

Babaee, Saeedeh; Hashemi, Hamed; Mohammadi, Amir H.; Naidoo, Paramespri; Ramjugernath, Deresh

doi:10.1016/j.jct.2014.09.008

Cited by 32 publications

(29 citation statements)

References 34 publications

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“…A step-change of 0.1 K per hour was used in the vicinity of the dissociation point. The point corresponding to the sharp change of the slope of the pressure−temperature plot is taken to be the final dissociation point [46][47][48][49][50][51]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 8 Figure 1 shows an example of the cooling and heating curve for the determination of the hydrate dissociation point.…”

Section: Methodsmentioning

confidence: 99%

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Experimental measurement and thermodynamic modelling of hydrate phase equilibrium conditions for krypton + n -butyl ammonium bromide aqueous solution

Babaee

Hashemi

Mohammadi

et al. 2016

The Journal of Supercritical Fluids

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Section: Methodsmentioning

confidence: 99%

“…The schematic diagram of the experimental apparatus used in this study has been previously reported in the literature [46,47]. and a height of 20 mm is situated inside the shaft.…”

Section: Equipmentmentioning

confidence: 99%

Experimental measurement and thermodynamic modelling of hydrate phase equilibrium conditions for krypton + n -butyl ammonium bromide aqueous solution

Babaee

Hashemi

Mohammadi

et al. 2016

The Journal of Supercritical Fluids

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“…Moles of gas consumed during hydrate formation determine the dissolved gas in hydrate phase which could form hydrate plug in the subsea condition. The total amount of consumed gas for complete hydrate formation is calculated by applying the real gas law [38,41]:…”

Section: Moles Of Gas Consumedmentioning

confidence: 99%

Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Khan¹,

Cornelius²,

Lal³

et al. 2018

Recent Advances in Ionic Liquids

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This present work highlights the impact of ammonium-based ionic liquid tetramethylammonium hydroxide (TMAOH) on the formation kinetics of carbon dioxide (CO 2), methane (CH 4), and their binary mixed gas (50-50 mole%) hydrates. The TMAOH (IL) is applied in varying concentrations (0.5, 1, and 2 wt%) at different experimental temperatures, i.e., 1 and 4°C. The kinetic experiments are conducted in a high-pressure reactor equipped with two-bladed impeller, to provide sufficient agitation. The experimental pressures of CO 2 , CH 4 , and mixed 50% CO 2 + 50% CH 4 were 3.50, 8.0, and 6.50 MPa, respectively. Induction time, the initial apparent rate of formation and the total gas consumed are the kinetic parameters used to evaluate the performance of TMAOH as KHI. The results are further compared with commercial KHI (PVP), at higher subcooling condition of 1°C and 1 wt% of all the studied gaseous systems. Furthermore, the KHI performance of TMAOH is also evaluated via the relative inhibition performance (RIP) compared with other ILs for CO 2 and CH 4 hydrates. Results revealed that TMAOH delays the induction time for all the considered systems. The presence of TMAOH also reduced the total gas consumed and the initial rate of hydrate formation in most of the studied systems.

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“…Due to high gas and energy storage capacity of gas hydrates and their potential for separation processes, great attention has been paid to the positive applications of this technology (such as natural gas storage and transportation, gas separation, energy storage, water desalination, refrigeration systems, and so on (Adisasmito et al 1991;Chatti et al 2005;Eslamimanesh et al 2012;Javanmardi and Moshfeghian 2003;Ji et al 2001;Li et al 2012;Ohgaki et al 1996;Xu and Ge 2011;Tanii 1994), in recent years. However, high pressure/low temperature dissociation conditions, long induction time, and slow kinetic rate of hydrate growth are the major problems with using gas hydrates in gas industries (Babaee et al 2015;Mohammadi et al 2014a;Zhang et al 2008). Therefore, moderating the thermodynamic conditions and promoting the kinetics of gas hydrate formation are essential to benefit the positive applications of this technology and thus reliable design of hydrate-based industries.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of (TBAF + CO2) semi-clathrate hydrate formation in the presence and absence of SDS

et al. 2018

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In this communication, the impacts of adding SDS (sodium dodecyl sulfate), TBAF (tetra-n-butylammonium fluoride) and the mixture of SDS ? TBAF on the main kinetic parameters of CO 2 hydrate formation (induction time, the quantity and rate of gas uptake, and storage capacity) were investigated. The tests were performed under stirring conditions at T = 5°C and P = 3.8 MPa in a 169 cm 3 batch reactor. The results show that adding SDS with a concentration of 400 ppm, TBAF with a concentration of 1-5 wt%, and the mixture of SDS ? TBAF, would increase the storage capacity of CO 2 hydrate and the quantity of gas uptake, and decrease the induction time of hydrate formation process. The addition of 5 wt% of TBAF and 400 ppm of SDS would increase the CO 2 hydrate storage capacity by 86.1% and 81.6%, respectively, compared to pure water. Investigation of the impact of SDS, TBAF and their mixture on the rate of gas uptake indicates that the mixture of SDS ? TBAF does not have a significant effect on the rate of gas uptake during hydrate formation process.Keywords Semi-clathrate hydrate Á Gas hydrate Á Kinetics Á CO 2 Á SDS Á TBAF List of symbols P Pressure R Universal gas constant T Temperature V Volume of the gas phase Z Compressibility factor Subscripts 0 Conditions of the cell at time t = 0 i Counter t Time w Water

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Kinetic and thermodynamic behaviour of CF 4 clathrate hydrates

Cited by 32 publications

References 34 publications

Experimental measurement and thermodynamic modelling of hydrate phase equilibrium conditions for krypton + n -butyl ammonium bromide aqueous solution

Experimental measurement and thermodynamic modelling of hydrate phase equilibrium conditions for krypton + n -butyl ammonium bromide aqueous solution

Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Kinetics of (TBAF + CO2) semi-clathrate hydrate formation in the presence and absence of SDS

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