Phase equilibrium and dynamic behavior of methane hydrates decomposition via depressurization in the presence of a promoter tert‑butanol

Shu, So-Siou; Tiwikrama, Ardila Hayu; Yang, Cyuan-De; Lee, Ming‐Jer

doi:10.1016/j.jtice.2018.10.007

Cited by 18 publications

(3 citation statements)

References 33 publications

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“…Figure 6 shows the pressure-temperature trend of each experiment. This figure also shows the phase-boundary equilibrium for methane hydrates, using data from the literature [43][44][45][46][47][48][49][50][51]. In the figures, black dots were used to represent the phase-boundary equilibrium for methane hydrates, while experiments were shown in red.…”

Section: δPform/δt [Bar/h]mentioning

confidence: 99%

Experimental Characterization of Memory Effect, Anomalous Self-Preservation and Ice-Hydrate Competition, during Methane-Hydrates Formation and Dissociation in a Lab-Scale Apparatus

Gambelli

Rossi

2022

Sustainability

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This study explores the process of methane hydrate formation and dissociation in a small-scale confined environment and in the presence of a porous sediment. The research is focused on answering the shortage of information about the intrinsic properties of the hydrate formation and dissociation processes, such as memory effect and anomalous self-preservation, in a lab-scale apparatus. Experiments were carried out consecutively and with the same gas–water mixture. The temperature reached during dissociation was high enough to ensure the complete dissolution of water cages. At the same time, it was sufficiently low to keep the system able to retain the memory of the previous formation of hydrates. Different well-known phenomena were observed and described; memory effect, anomalous self-preservation and competition between ice and hydrates were shown in detail. Experiments confirmed that the memory effect improves the process mainly during the initial nucleation phase, while it does not provide significant changes in the following massive growth phase. Finally, experiments proved that the formation process can be divided in two different steps: the initial intense growth, due to the small difference in local equilibrium conditions, and the subsequent asymptotic growth, which continues until the process is completed.

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Section: δPform/δt [Bar/h]mentioning

confidence: 99%

Experimental Characterization of Memory Effect, Anomalous Self-Preservation and Ice-Hydrate Competition, during Methane-Hydrates Formation and Dissociation in a Lab-Scale Apparatus

Gambelli

Rossi

2022

Sustainability

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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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“…Figures 1, 2, 3, 4, 5 and 6 show two different trends: methane, carbon dioxide, and nitrogen assume the same behavior, or a relatively gradual increase in pressure needed for hydrate formation with the increasing temperature; conversely, ethane, propane, and butane have an almost constant trend of Fig. 1 Phase equilibrium diagram for pure methane hydrate (Bavoh et al 2017;Bottger et al 2016;Gambelli and Rossi 2019;Kassim et al 2019;Saberi et al 2018;Sadeq et al 2017;Semenov et al 2015;Shu et al 2019) pressure, until reaching a critical temperature value, after which pressure immediately and drastically increases.…”

Section: Thermodynamic Conditions For Hydrate Formationmentioning

confidence: 99%

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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Phase equilibrium and dynamic behavior of methane hydrates decomposition via depressurization in the presence of a promoter tert‑butanol

Cited by 18 publications

References 33 publications

Experimental Characterization of Memory Effect, Anomalous Self-Preservation and Ice-Hydrate Competition, during Methane-Hydrates Formation and Dissociation in a Lab-Scale Apparatus

Experimental Characterization of Memory Effect, Anomalous Self-Preservation and Ice-Hydrate Competition, during Methane-Hydrates Formation and Dissociation in a Lab-Scale Apparatus

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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