Hydrate structure stability in simple and mixed hydrates

Hendriks, E.M.; Edmonds, Beryl; Moorwood, R.A.S.; Szczepanski, Richard

doi:10.1016/0378-3812(95)02953-2

Cited by 54 publications

(50 citation statements)

References 9 publications

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“…Mixtures of CH 4 and C 2 H 6 are also found to form both sI and sII hydrate, depending on the vapor composition in equilibrium with the hydrate phase. This interesting phenomenon was predicted theoretically (Hendriks et al, 1996) and confirmed experimentally (Subramanian et al, 2000a,b;Ballard and Sloan, 2000;Uchida et al, 2002).…”

Section: Introductionmentioning

confidence: 57%

Two‐step formation of methane–propane mixed gas hydrates in a batch‐type reactor

Uchida¹,

Moriwaki²,

Takeya³

et al. 2004

AIChE Journal

103

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Section: Introductionmentioning

confidence: 57%

Two‐step formation of methane–propane mixed gas hydrates in a batch‐type reactor

Uchida¹,

Moriwaki²,

Takeya³

et al. 2004

AIChE Journal

103

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“…Another structural transition prediction using this hydrate model was reported by Hendriks et al [6], in 1996, for binary systems of simple sI formers including H 2 S + C 2 H 6 and CH 4 + C 2 H 6 . The CH 4 + C 2 H 6 structural transition was later verified experimentally by Subramanian et al [7], who found that at 278 K, sII hydrate forms for methane compositions between 73 and 99 mol%.…”

Section: Introductionmentioning

confidence: 87%

sII Structural Transitions from Binary Mixtures of Simple sI Formers

Hester

Sloan

2005

Int J Thermophys

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Previous work has shown structure II structural transitions for binary guest mixtures of simple structure I formers. This phenomenon was investigated using the hydrate statistical mechanical model developed by van der Waals and Platteeuw. Langmuir constants were employed to suggest that molecules at either extrema of the sI size range will form sII when mixed together. Thus, CO 2 , an intermediate-sized sI former, was determined not to undergo a sII transition when combined with another sI former. Correlations between the Kihara potential parameters and physical properties were also made for pure hydrate formers.

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“…SII is the preferred structure due to the relative stability of the molecules in the hydrate cages (guest-to-cavity-ratio) together with their ratio of large to small cavities in a unit cell of sII hydrates [18,26]. Hendriks et al [27] explain it invoking the abundance of small cavities in sII hydrates which are stabilized exclusively by CH 4 . Therefore, the competition between CH 4 and C 2 H 6 for the occupation of large cavities in the hydrate is reduced compared to sI hydrates.…”

Section: Guest-to-cavity-ratiomentioning

confidence: 99%

The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH4-CO2 Exchange in the Presence of Impurities

Beeskow‐Strauch

Schicks

2012

Energies

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Abstract:The recovery of CH 4 gas from natural hydrate formations by injection of industrially emitted CO 2 is considered to be a promising solution to simultaneously access an unconventional fossil fuel reserve and counteract atmospheric CO 2 increase. CO 2 obtained from industrial processes may contain traces of impurities such as SO 2 or NO x and natural gas hydrates may contain higher hydrocarbons such as C 2 H 6 and C 3 H 8 . These additions have an influence on the properties of the resulting hydrate phase and the conversion process of CH 4 -rich hydrates to CO 2 -rich hydrates. Here we show results of a microscopic and laser Raman in situ study investigating the effects of SO 2 -polluted CO 2 and mixed CH 4 -C 2 H 6 hydrate on the exchange process. Our study shows that the key driving force of the exchange processes is the establishment of the chemical equilibrium between hydrate phase and the surrounding phases. The exchange rate is also influenced by the guest-to-cavity ratio as well as the thermodynamic stability in terms of p-T conditions of the original and resulting hydrate phase. The most effective molecule exchange is related to structural changes (sI-sII) which indicates that hydrate decomposition and reformation processes are the occurring processes.

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Hydrate structure stability in simple and mixed hydrates

Cited by 54 publications

References 9 publications

Two‐step formation of methane–propane mixed gas hydrates in a batch‐type reactor

Two‐step formation of methane–propane mixed gas hydrates in a batch‐type reactor

sII Structural Transitions from Binary Mixtures of Simple sI Formers

The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH4-CO2 Exchange in the Presence of Impurities

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