Development of dual functional methodology for seawater desalination and salt manufacture by carbon dioxide hydrate formation

Gibo, Akari; Nakao, Seiya; Shiraishi, Sayaka; Takeya, Satoshi; Tomura, Shigeo; Ohmura, Ryo; Yasuda, Keita

doi:10.1016/j.desal.2022.115937

Cited by 22 publications

(5 citation statements)

References 42 publications

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“…It has several advantages compared to conventional fossil energy (e.g., natural gas, coal): according to a conservative estimate, global natural gas hydrate resources can reach 3 × 10 14 m 3 , 3 more than twice of all known fossil fuel resources 4 ; the energy density is 2–5 times that of typical natural gas 5 . Additionally, due to its unique physical and chemical properties, several potential hydrate‐based technological applications are extensively used in seawater desalination, 6 cold energy storage 7,8 gas mixture separation, 9–11 extraction of biological protease, 12 transportation and storage of natural gas, 13–16 and other fields.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness on methane hydrate formation and its implications in nucleation design

Fan

Wang

et al. 2023

AIChE Journal

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As a new form of energy with substantial potential, natural gas hydrate will play a crucial strategic role in the future due to its vast reserves and broad industrial application prospects. To better comprehend the nucleation and growth mechanism of clathrate hydrate, an enhanced thermodynamic model was proposed based on the wall roughness model and nucleation theory. In general, we discovered that the nucleation of hydrate on a smooth wall surface conforms to the conclusion of classical nucleation theory. However, curvature and surface roughness are frequently characterized by hydrophilicity's inhibition of hydrate and hydrophobicity's enhancement.The specific situation is more complex and requires specific analysis and discussion.Nonetheless, this also explains the uneven distribution of hydrate nucleation induction time. Our research reveals a fundamental method for designing or manipulating the heterogeneous nucleation of hydrates. We foresee promising applications in hydrate-related technologies based on the fractal structure of the substrate's surface.

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Section: Introductionmentioning

confidence: 99%

Effect of surface roughness on methane hydrate formation and its implications in nucleation design

Fan

Wang

et al. 2023

AIChE Journal

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“…at a certain pressure and temperature. , There are mainly three known hydrate structures: sI, sII, and sH. , The hydrate formation was initially considered as a hazard since it was the main reason that caused the blockage of transmission pipelines . Nowadays, some important applications based on the hydrate technology have been developed and gained more and more attention, such as the gas storage and separation, − CO 2 capture, seawater desalination, , refrigeration, and so forth. For the hydrate-based gas storage, namely, solidified natural gas (SNG) technology, it offers a novel option to store CH 4 (principle component of NG) which has been reported that 1 m 3 sI hydrate can store 172 m 3 CH 4 if both the small (5 12 ) and large (5 12 6 2 ) cages are fully occupied. , However, normally the requirements to form pure CH 4 (sI) hydrate is severe because it needs the higher pressure and lower temperature conditions. , The use of stirring technologies for increasing the gas–liquid contact area in CH 4 hydrate formation would lead to a high energy consume in large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 The hydrate formation was initially considered as a hazard since it was the main reason that caused the blockage of transmission pipelines. 17 Nowadays, some important applications based on the hydrate technology have been developed and gained more and more attention, such as the gas storage and separation, 18−21 CO 2 capture, 22 seawater desalination, 23,24 refrigeration, 25 natural gas (SNG) technology, 19 it offers a novel option to store CH 4 (principle component of NG) which has been reported that 1 m 3 sI hydrate can store 172 m 3 CH 4 if both the small (5 12 ) and large (5 12 6 2 ) cages are fully occupied. 19,26 However, normally the requirements to form pure CH 4 (sI) hydrate is severe because it needs the higher pressure and lower temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Methane Storage by Forming sII Hydrate in the Presence of a Novel Kinetic Promoter with the Function of Alleviating the Wall-Climbing Growth

Tan

et al. 2023

Energy Fuels

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Storing methane by forming structure II hydrate in the presence of thermodynamic hydrate promoters gains extensive attention due to the moderate operation conditions. Although the reaction rate and gas uptake can be improved by adding kinetic hydrate promoters (KHPs), the concomitant wall-climbing effect often leads to reactors and even pipelines being filled with hydrate. Therefore, in this study, a novel kind of KHPs [cocamidopropyl dimethylamine (CDA)] was developed to promote CH 4 / tetrahydrofuran (THF, 5.56 mol %) hydrate formation and alleviate the hydrate wall-climbing growth. Results showed that the hydrate formation rate enhanced, and the induction time decreased as the CDA concentration increased. The largest CH 4 storage capacity achieved was 107.78 ± 1.89 v/v (the volume ratio of gas to hydrate, and the theoretical value is 115 v/v) at 283.15 K and at an initial pressure of 7.2 MPa, which was obtained at the CDA concentration of 0.2 wt %. The evolutionary morphologies of hydrate growth in the presence or absence of CDA were observed during the initial formation stage, confirming the great promotion effect of CDA on CH 4 /THF hydrate formation. The hydrate formed in the systems without CDA filled up the entire window, while the wall-climbing effect was significantly alleviated in the CDA-contained systems. As far as we know, this is the first time to report that a KHP (CDA) has the dual function of enhancing hydrate formation kinetics and alleviating its upward growth. In addition, the effect of CDA and L-tryptophan (L-Trp) on hydrate formation was compared at their optimal dosages under the currently experimental conditions, and the results indicated that CDA performed better in terms of hydrate induction time, formation rate, gas uptake, and wall-climbing height.

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“…Hydrates are expected to be used in various applications because hydrates have unique properties, for example high gas storage capacities, large formation/decomposition heats, and guest compounds selectivity. There are several novel applications utilizing carbon dioxide hydrate such as carbon capture [13], salt manufacture [4][5][6] and carbonated solid foods [7,8]. Tritium water concentration through hydrate formation is an emerging technology that utilizes another unique property of hydrates; host compounds selectivity [9].…”

Section: Introductionmentioning

confidence: 99%

Renewed Measurements of Carbon Dioxide Hydrate Phase Equilibrium

Ito

Gibo

Shiraishi

et al. 2023

Preprint

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This paper investigates phase equilibrium conditions in the carbon dioxide hydrate forming system. Carbon dioxide hydrate can be utilized for carbon capture, salt manufacture, carbonated solid foods and tritium water concentration, so the phase equilibrium conditions have been substantially reported so far. However, the data from previous studies were inconsistent with each other, such as there is a difference of 1.0 K in the phase equilibrium temperature at 2 MPa. In this study, the newly three-phase (water rich liquid + hydrate + carbon dioxide rich vapor) equilibrium conditions in the carbon dioxide hydrate forming system were measured at twenty different temperature conditions within the range of (271.9-282.7) K in the two different laboratories. The six pairs of three-phase equilibrium condition data measured under equivalent pressure conditions were consistent within mutual uncertainties. The internal consistency of the data measured in this study was evaluated by the Clausius-Clapeyron equation. The data measured in this study existed within the uncertainty range of the data from several previous studies.

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Development of dual functional methodology for seawater desalination and salt manufacture by carbon dioxide hydrate formation

Cited by 22 publications

References 42 publications

Effect of surface roughness on methane hydrate formation and its implications in nucleation design

Effect of surface roughness on methane hydrate formation and its implications in nucleation design

Methane Storage by Forming sII Hydrate in the Presence of a Novel Kinetic Promoter with the Function of Alleviating the Wall-Climbing Growth

Renewed Measurements of Carbon Dioxide Hydrate Phase Equilibrium

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