Hydrate-containing phase equilibria for mixed guests of carbon dioxide and nitrogen

Kim, Sun Hyung; Seo, Myoung Do; Kang, Jeong Won; Lee, Chul Soo

doi:10.1016/j.fluid.2011.04.011

Cited by 20 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This implies that the gas hydrate stability domain for a flue gas injected into a large water-rich system will likely be shifted to higher pressures. This pressure shift is also noticeable if the feed gas is richer in CO 2 (84.1-90.6 mol-%) with a high H 2 O water content [33]. This finding is in agreement with Beltran et al [56] who highlighted the importance of correctly defining either the initial gas feed and water amount or the composition of the vapor when determining the gas hydrate point of dissociation.…”

Section: Phase Equilibrium Of Mixed Gas Hydratessupporting

confidence: 88%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Phase Equilibrium Of Mixed Gas Hydratessupporting

confidence: 88%

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

View full text Add to dashboard Cite

show abstract

“…2−5 The four-phase behavior can be observed on the pressure−temperature plane when the V−L g two-phase loop of guests intersects with the incipient hydrate formation locus. 2 The degree of freedom is one for a four-phase system composed of three components. Therefore, a single four-phase curve is generated from the quadruple point of carbon dioxide and water system to that of sulfur dioxide and water system, showing a pseudoretrograde hydrate behavior.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Three-and four-phase equilibrium conditions were determined by measuring the isobaric dissolution temperatures of formed hydrates with an indirect visual phase equilibrium apparatus. The apparatus and procedure for this experiment were identical with those of Kim et al 2 which were used for measurements of four-phase equilibria of mixtures composed of carbon dioxide, nitrogen, and water. While two pure gases of carbon dioxide and nitrogen were charged into the equilibrium cell separately in Kim et al, a single gas cylinder of the mixed gas with the predetermined composition was used in the present study for environmental and safety considerations.…”

Section: ■ Introductionmentioning

confidence: 99%

“…L W –H ∞ –V–L g four-phase behavior of binary guest and water system containing carbon dioxide has been investigated by several studies. − The four-phase behavior can be observed on the pressure–temperature plane when the V–L g two-phase loop of guests intersects with the incipient hydrate formation locus . The degree of freedom is one for a four-phase system composed of three components.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase Equilibria Containing Gas Hydrate of Carbon Dioxide, Sulfur Dioxide, and Water Mixtures

et al. 2013

Self Cite

View full text Add to dashboard Cite

Three- and four-phase hydrate equilibria for mixtures composed of carbon dioxide, sulfur dioxide and water were measured at pressures up to 5.00 MPa. Using Duhem’s theorem on phase equilibrium, incipient hydrate-forming temperatures at given pressures with overall loading compositions of all components were measured, using an indirect visual phase equilibrium apparatus. In this study, effects of the relative amount of water to fixed composition of carbon dioxide and sulfur dioxide gas feed were studied. Phase equilibria were found to be sensitive to the water fraction at higher concentrations of sulfur dioxide in the gas feed but insensitive at lower concentrations. Four-phase equilibrium measurements showed the pseudoretrograde hydrate behavior.

show abstract

“…The PVT sapphire cell apparatus was used to measure the hydrate dissociation conditions by employing the temperature search method as an experimental determination technique (Kim et al 2011;Loh et al 2012;Smith et al 2015;AlHarooni et al 2015;Smith et al 2016). Experimentally, the PVT cell was maintained at a constant pressure using the piston pump and keeping the valve to the PVT cell open.…”

Section: Fig 1 Schematic Of the Pvt Sapphire Cellmentioning

confidence: 99%

Experimental determination of hydrate phase equilibrium for different gas mixtures containing methane, carbon dioxide and nitrogen with motor current measurements

Sadeq

Iglauer

Lebedev

et al. 2017

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

Hydrate dissociation equilibrium conditions for carbon dioxide + methane with water, nitrogen + methane with water and carbon dioxide + nitrogen with water were measured using cryogenic sapphire cell.Measurements were performed in the temperature range of 275.75K to 293.95K and for pressures ranging from 5 MPa to 25 MPa. The resulting data indicate that as the carbon dioxide concentration is increased in the gas mixture, the gas hydrate equilibrium temperature increases. In contrast, by increasing the nitrogen concentration in the gas mixtures containing methane or carbon dioxide decreased the gas hydrate equilibrium temperatures. Furthermore, the cage occupancies for the carbon dioxide + methane system were evaluated using the Van der Waals and Platteeuw thermodynamic theory with the Langmuir adsorption model and Peng-Robinson equation of state. The data demonstrated the increasing promoting effect of carbon dioxide with its concentration.In addition, the motor current changes during the hydrate formation and dissociation processes were measured by keeping the rotation speed of the magnetic stirrer that was connected to a DC motor constant.The motor current measurements were reported and it showed that the hydrate plug formation and dissociation could be predicted by the changes in the motor current.

show abstract

Hydrate-containing phase equilibria for mixed guests of carbon dioxide and nitrogen

Cited by 20 publications

References 6 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

Phase Equilibria Containing Gas Hydrate of Carbon Dioxide, Sulfur Dioxide, and Water Mixtures

Experimental determination of hydrate phase equilibrium for different gas mixtures containing methane, carbon dioxide and nitrogen with motor current measurements

Contact Info

Product

Resources

About