Stochastic nature of nucleation and growth kinetics of THF hydrate

Sun, Shicai; Xia, Peng; Zhang, Yong; Zhao, Jie; Yayun, Kong

doi:10.1016/j.jct.2016.12.026

Cited by 49 publications

(25 citation statements)

References 80 publications

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“…Use of promoters has attracted widespread interest in hydrate-based desalination as they improve hydrate formation rate and moderate the equilibrium pressure. Tetrahydrofuran (THF) and tetrabutyl ammonium bromide (TBAB) are among the most widely discussed types of additives (Herslund et al, 2013;Karamoddin & Varaminian, 2014;Liu et al, 2015;Najibi et al, 2015;Sun et al, 2016). Despite advantages of these promoters on increasing the salt removal efficiency, their solubility in water is a major issue in hydrate-based desalination process.…”

Section: Introductionmentioning

confidence: 99%

Phase equilibrium measurements and modelling of mixed cyclopentane and carbon dioxide hydrates in presence of salts

Babakhani

Ho-Van

Bouillot

et al. 2020

Chemical Engineering Science

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Interest of Clathrate hydrates for industrial applications is rising. While numerous studies can be found on carbon capture or desalination, this effort investigates thermodynamics of the combined process using cyclopentane (CP) as second guest molecule. This document provides numerous equilibrium data of mixed CP/CO2 hydrates in presence of salt (NaCl, KCl) under differents concentrations. Final dissociation points are collected, as well as intermediate dissociation points in presence of hydrates. While the first provide equilibrium data, the others are not at equilibrium. Indeed, Results show that, in presence of salts, several crystallization events occur in the system. Consequently, multiple hydrate structures could be formed in the bulk, such as pure CO2 hydrates and mixed CO2/CP hydrates Finally, van der Waals and Platteeuw approach has been used and furnishes results within 0.4K uncertainty compared to this work and within 0.5K compared to literature. Besides, thermodynamic consistency of data has been evaluated.

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Section: Introductionmentioning

confidence: 99%

Phase equilibrium measurements and modelling of mixed cyclopentane and carbon dioxide hydrates in presence of salts

Babakhani

Ho-Van

Bouillot

et al. 2020

Chemical Engineering Science

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“…In other words, the induction time is the time elapsed until the appearance of a certain detectable volume of hydrate nuclei judged by turbidity, pressure fluctuations, and temperature fluctuations in previous studies. However, the judgment of hydrate nuclei in previous studies lacks accuracy if considering the randomness and heterogeneity of hydrate nucleation [82][83][84][85]. In hydrate-bearing sediments, the working principles of LF-NMR are based on the phenomenon that the NMR responses of 1 H residing in various phases are quite different [33,71].…”

Section: Kinetics Of Gas Hydrate Formationmentioning

confidence: 99%

Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Liu

Zhan

et al. 2022

Water

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The formation process, structure, and distribution of gas hydrate in sediments have become focal points in exploring and exploiting natural gas hydrate. To better understand the dynamic behavior of gas hydrate formation in sediments, transverse relaxation time (T2) of nuclear magnetic resonance (NMR) is widely used to quantitatively characterize the formation process of gas hydrate and the change in pore characteristics of sediments. NMR T2 has been considered as a rapid and non-destructive method to distinguish the phase states of water, gas, and gas hydrate, estimate the saturations of water and gas hydrate, and analyze the kinetics of gas hydrate formation in sediments. NMR T2 is also widely employed to specify the pore structure in sediments in terms of pore size distribution, porosity, and permeability. For the recognition of the advantages and shortage of NMR T2 method, comparisons with other methods as X-ray CT, cryo-SEM, etc., are made regarding the application characteristics including resolution, phase recognition, and scanning time. As a future perspective, combining NMR T2 with other techniques can more effectively characterize the dynamic behavior of gas hydrate formation and pore structure in sediments.

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“…It is well known that the first hydrate formation that reflects the stochastic nature of nucleation possesses a long induction time, implying that more time and energy must be consumed, 14−16 which goes against the principle of cold storage at cost. 17,18 Therefore, many efforts, such as the use of surfactants and porous media, have been made to shorten the induction time.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Formation Stability of 1,1,1,2-Tetrafluoroethane Hydrate in Different SDS Solution Systems and Dissociation Characteristics Using Thermal Stimulation Combined with Depressurization

et al. 2019

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Cold storage using hydrates for cooling is a high-efficiency technology. However, this technology suffers from problems such as the stochastic nature of hydrate nucleation, cyclic hydrate formation instability, and a low cold discharge rate. To solve these problems, it is necessary to further clarify the characteristics of hydrate formation and dissociation in different systems. First, a comparative experimental study in pure water and sodium dodecyl sulfate (SDS) solution systems was conducted to explore the influence of SDS on the morphology of the hydrate and the time needed for its formation under visualization conditions. Subsequently, the cyclic hydrate formation stability was investigated at different test temperatures with two types of SDS solution systems—with or without a porous medium. The induction time, full time, and energy consumption time ratio of the first hydrate formation process and the cyclic hydrate reformation process were analyzed. Finally, thermal stimulation combined with depressurization was used to intensify hydrate dissociation compared with single thermal stimulation. The results showed that the growth morphology of hydrate and the time required for its formation in the SDS solution system were obviously different than those in pure water. In addition, the calculation and comparison results revealed that the induction time and full time of cyclic hydrate reformation were shorter and the energy consumption time ratio was smaller in the porous medium. The results indicated that a porous medium could improve the cyclic hydrate formation process by making it more stable and by decreasing time and energy costs. Thermal stimulation combined with depressurization at different backpressures (0.1, 0.2, 0.3, and 0.4 MPa) effectively promoted the decomposition of hydrates, and with the decrease in backpressure, the dissociation time decreased gradually. At a backpressure of 0.1 MPa, the dissociation time was reduced by 150 min. The experimental results presented the formation and dissociation characteristics of 1,1,1,2-tetrafluoroethane hydrates in different systems, which could accelerate the application of gas hydrates in cold storage.

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Stochastic nature of nucleation and growth kinetics of THF hydrate

Cited by 49 publications

References 80 publications

Phase equilibrium measurements and modelling of mixed cyclopentane and carbon dioxide hydrates in presence of salts

Phase equilibrium measurements and modelling of mixed cyclopentane and carbon dioxide hydrates in presence of salts

Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Cyclic Formation Stability of 1,1,1,2-Tetrafluoroethane Hydrate in Different SDS Solution Systems and Dissociation Characteristics Using Thermal Stimulation Combined with Depressurization

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