Hydrate phase equilibria of the guest mixtures containing CO2, N2 and tetrahydrofuran

Kang, Seong-Pil; Lee, Huen; Cs, Lee; Sung, WM

doi:10.1016/s0378-3812(01)00460-5

Cited by 253 publications

(165 citation statements)

References 3 publications

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“…In our work, the water proportion was very high (Table 3), thus in the vapor phase at HVLE, the composition of the more soluble gas compound must decrease (but was not measured here). In Figure 2 our data are plotted together with some data of Kang et al [29] and Lee et al [36] who measured phase equilibria with gas feed compositions close to ours. Their data with 10 mol-% of CO 2 are also plotted, showing that a decrease of the CO 2 :N 2 ratio in the system leads to an increase of the dissociation pressure.…”

Section: Phase Equilibrium Of Mixed Gas Hydratessupporting

confidence: 78%

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

et al. 2018

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This article presents gas hydrate experimental measurements for mixtures containing methane (CH 4 ), carbon dioxide (CO 2 ) and nitrogen (N 2 ) with the aim to better understand the impact of water (H 2 O) on the phase equilibrium. Some of these phase equilibrium experiments were carried out with a very high water-to-gas ratio that shifts the gas hydrate dissociation points to higher pressures. This is due to the significantly different solubilities of the different guest molecules in liquid H 2 O. A second experiment focused on CH 4 -CO 2 exchange between the hydrate and the vapor phases at moderate pressures. The results show a high retention of CO 2 in the gas hydrate phase with small pressure variations within the first hours. However, for our system containing 10.2 g of H 2 O full conversion of the CH 4 hydrate grains to CO 2 hydrate is estimated to require 40 days. This delay is attributed to the shrinking core effect, where initially an outer layer of CO 2 -rich hydrate is formed that effectively slows down the further gas exchange between the vapor phase and the inner core of the CH 4 -rich hydrate grain.

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Section: Phase Equilibrium Of Mixed Gas Hydratessupporting

confidence: 78%

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

et al. 2018

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“…Several publications are available in the literature, presenting THF as a possible promoter in pre- Linga et al, 2007aLinga et al, , 2007bZhang et al, 2009) or post combustion ( Giavarini et al, 2010, Kang andLee, 2000;Kang et al, 2001;Linga et al, 2010;Linga et al, 2007bLinga et al, , 2008 hydrate-based CO 2 capture processes. However, only a few publications provide detailed phase equilibrium data for the ternary system of water, THF and CO 2 , especially at low temperatures and THF concentrations of approximately 17.4 mass percent (5 mole percent) in the aqueous phase (Delahaye et al, 2006;Sabil et al, 2010;Seo et al, 2008).…”

Section: Tetrahydrofuran -A Hydrophilic Hydrate Promotermentioning

confidence: 99%

“…Why should this mixed promoter system be superior to the single promoter system? Tetrahydrofuran (THF) is an example of a molecule that is soluble in water but has also been shown to be a structure II hydrate promoter (Kang et al, 2001) with increasing effect up to concentrations of 5 to 6 mole percent in the aqueous phase. This concentration is consistent with a single THF molecule occupying and stabilizing the large cage of SII hydrate (a ratio of 17 water molecules to one THF molecule).…”

Section: Mixed Promoter System -Hydrate Equilibriummentioning

confidence: 99%

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Herslund

Thomsen

Abildskov

et al. 2013

International Journal of Greenhouse Gas Control

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“…A previous study based on exhaust gas seemed to assume that mixed hydrates would be formed (Kang and Lee 2000). However, more recent work does indicate that ''pure'' hydrates would be formed (Kang et al 2001). Dalmazzone et al (2004) worked with methane and contaminated water-but they explicitly state that their results depend on the fact that methane is barely soluble in water.…”

Section: Introductionmentioning

confidence: 98%

Resolving CO2 and methane hydrate formation kinetics

et al. 2008

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We analyse the kinetics of CO 2 and methane hydrate formation. The characteristic formation times are associated with different steps of the formation process. Conditions for minimising these rate times are identified while maintaining a regime where CO 2 hydrate is formed and methane remains predominantly gaseous. This involves a rapid pressurisation routine and accesses points well above the phase boundary in order to enable faster kinetics. Conditions for optimising rates and times, to obtain maximum CO 2 uptake with respect to CH 4 , were identified as (1) stirring faster than 1,000 rpm, (2) rapid pressurisation to a partial pressure of around 50 bar for CO 2 and (3) re-use of contaminated as opposed to fresh water.

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Hydrate phase equilibria of the guest mixtures containing CO2, N2 and tetrahydrofuran

Cited by 253 publications

References 3 publications

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Resolving CO2 and methane hydrate formation kinetics

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