Preliminary study on measurement technology for hydrate phase equilibrium

Sun, Shicai; Zhang, Yong; Yayun, Kong; Liu, Changling; Liu, Yufeng

doi:10.1016/j.fluid.2015.06.010

Cited by 41 publications

(9 citation statements)

References 68 publications

(70 reference statements)

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“…Furthermore, the CH 4 recovery shows a substantial increase when the CP concentration increases from 4 to 13 wt %. Experiments with THF have been reported by Zhong et al, 193 Shicai et al, 195 and Cai et al 196 and all agree that significant reduction in the hydrate equilibrium pressure is obtained by using THF. TBAB has been employed by Zhong and Englezos, 192 Sun et al, 197 and Liao et al, 198 while Cai et al 196 used TBAF.…”

Section: Presentation and Discussion Of Thementioning

confidence: 63%

Recent Advances in Experimental Measurements of Mixed-Gas Three-Phase Hydrate Equilibria for Gas Mixture Separation and Energy-Related Applications

et al. 2019

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Clathrate hydrates are currently studied extensively due to their involvement in important industrial processes. For certain industrial applications (e.g., flow assurance in oil/gas industry), they are considered a “nuisance” and their presence needs to be either suspended completely or adequately controlled. On the other hand, for other industrial applications (e.g., gas mixture separation, water desalination, and purification), hydrate formation is sought after, since it can facilitate the desired outcome. In either case, it is essential to have reliable values for the hydrate equilibrium conditions, in order to design appropriately the corresponding industrial applications. In the current study, we review the experimental studies that have reported three-phase hydrate equilibrium measurements. We focus primarily on studies that were published after the year 2008. Furthermore, we report only studies that examine the gas mixtures of two or more components. Of primary interest are gas mixtures that have significant industrial applications and include components such as carbon dioxide, nitrogen, hydrogen, methane, ethane, propane, hydrogen sulfide, and oxygen. The examined mixtures include at least one of the aforementioned gases. Of particular interest in this review are applications such as gas mixture separation (where hydrate promotion is desirable) and energy-related application such as flow assurance during oil/gas production and transportation (where hydrate inhibition is desirable). The mixtures that are included in the review are grouped under 15 gas mixture types. For most of the gas mixtures that are examined, the related industrial applications are identified and briefly discussed. In the current review, the different gas mixtures are also critically discussed and suggestions for possible future directions are presented regarding the examination of tentative additives to be used for promotion or inhibition.

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Section: Presentation and Discussion Of Thementioning

confidence: 63%

Recent Advances in Experimental Measurements of Mixed-Gas Three-Phase Hydrate Equilibria for Gas Mixture Separation and Energy-Related Applications

et al. 2019

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“…Hydrate compounds were formed and then left free to dissociate in order to produce equilibrium values. A comparison between the results here produced and equilibrium values present elsewhere in the literature was provided [ 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 ].…”

Section: Resultsmentioning

confidence: 99%

Methane and Carbon Dioxide Hydrate Formation and Dissociation in Presence of a Pure Quartz Porous Framework Impregnated with CuSn12 Metallic Powder: An Experimental Report

et al. 2021

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Hydrate formation and dissociation processes were carried out in the presence of a pure quartz porous medium impregnated with a metallic powder made with a CuSn12 alloy. Experiments were firstly made in the absence of that powder; then, different concentrations were added to the porous medium: 4.23 wt.%, 18.01 wt.%, and 30.66 wt.%. Then, the hydrate dissociation values were compared with those present in the literature. The porous medium was found to act as an inhibitor in the presence of carbon dioxide, while it did not alter methane hydrate, whose formation proceeded similarly to the ideal trend. The addition of CuSn12 promoted the process significantly. In particular, in concentrations of up to 18.01 wt.%, CO2 hydrate formed at milder conditions until it moved below the ideal equilibrium curve. For methane, the addition of 30.66 wt.% of powder significantly reduced the pressure required to form hydrate, but in every case, dissociation values remained below the ideal equilibrium curve.

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“…Fig. 5 Phase equilibrium diagram for pure carbon dioxide hydrate (Chen et al 2009;Herri et al 2011;Khan et al 2017a;Khan et al 2017b;Kyung et al 2014;Nema et al 2017;Shicai et al 2015;) Fig. 6 Phase equilibrium diagram for pure nitrogen hydrate (Herri et al 2011;Yasuda et al 2013;Jarrahian and Nakhaee 2019) In all cases, the main component is methane, which ranged from 0.7213 to 0.9112 mf; for that reason, the equilibrium behavior of hydrate with those natural gas mixtures is very similar to that of methane.…”

Section: Thermodynamic Conditions For Hydrate Formationmentioning

confidence: 92%

Hydrate formation as a method for natural gas separation into single compounds: a brief analysis of the process potential

Gambelli

Rossi

2021

Arab J Geosci

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In both natural gas and petroleum reservoirs, the extracted gas is not only composed of methane: a variable and significant quantity of other compounds, such as different hydrocarbons (ethane, butane, pentane, propane, etc.), inert gas (nitrogen), and toxic and corrosive molecules (i.e., carbon dioxide and hydrogen sulfide), are present. In order to reach commercial specifications, natural gas has to be treated, in particular for reaching the minimum gross calorific value required and decreasing CO2 and H2S presence under the respective tolerance values. To do this, several different treatments are commonly applied, like inlet separation, sweetening, mercury removal, dehydration, liquid recovery, and, finally, compression for its transportation. Considering the growing demand and the necessity of exploiting also lower quality natural gas reservoirs, in the present paper, an original solution, for performing a gas treatment, is proposed and analyzed. It consists of promoting hydrates formation for both different compounds separation and gas storage. The greatest part of chemicals commonly present in natural gas is capable to form hydrates, but at different thermodynamic conditions than others. Parameters such as the typology of stored compound and the formation process efficiency are mainly related to partial pressure of each element. Here, the present strategy has been explored and the results achievable were shown. In particular, different possible natural gas compositions were taken into account and specifications required for gas commercialization were considered target of the process. Results led to different possibilities of raw gas treatment: in some cases, gas separation led to contemporary CH4 storage into hydrate structures, while, in the presence of different mixture compositions, contaminants were trapped into water cages and methane (and, eventually, other hydrocarbon compounds) remained in the gas phase.

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Preliminary study on measurement technology for hydrate phase equilibrium

Cited by 41 publications

References 68 publications

Recent Advances in Experimental Measurements of Mixed-Gas Three-Phase Hydrate Equilibria for Gas Mixture Separation and Energy-Related Applications

Recent Advances in Experimental Measurements of Mixed-Gas Three-Phase Hydrate Equilibria for Gas Mixture Separation and Energy-Related Applications

Methane and Carbon Dioxide Hydrate Formation and Dissociation in Presence of a Pure Quartz Porous Framework Impregnated with CuSn12 Metallic Powder: An Experimental Report

Hydrate formation as a method for natural gas separation into single compounds: a brief analysis of the process potential

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