The Relationship between Thermal Characteristics and Microstructure/Composition of Carbon Dioxide Hydrate in the Presence of Cyclopentane

Xu, Chun‐Gang; Wang, Min; Xu, Gang; Li, Xiao-Sen; Zhang, Wei; Cai, Jing; Chen, Zhaoyang

doi:10.3390/en14040870

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…Rodger [32] believed that the memory effect of methane hydrate is caused by the high concentration of methane in the solution due to the slow diffusion of methane after dissociation. Similarly, Zhang [30] studied the dissolution properties of CO 2 throughout the induction time and concluded that the 'memory effect' of hydrate should not be attributed to the residual structure. Instead, the residual gas molecules in the aqueous solution and the gas concentration are the key factors in hydrate nucleation.…”

Section: Mnbs Reinforce Hydrate Formation With Memory Effectmentioning

confidence: 99%

“…In addition, mechanical stirring is complex and challenging to apply on a large scale at high pressure and low temperature. Additives (including sodium dodecyl sulfate (SDS) [22,23], tetrabutylammonium bromide (TBAB) [24,25], tetrahydrofuran (THF) [26,27], cyclopentane (CP) [28][29][30], etc.) introduce impurities and disrupt the hydrate reaction system, which is Processes 2023, 11, 1019 2 of 15 not ideal for reinforcement effects.…”

Section: Introductionmentioning

confidence: 99%

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Fast Formation of Hydrate Induced by Micro-Nano Bubbles: A Review of Current Status

et al. 2023

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Hydrate-based technologies have excellent application potential in gas separation, gas storage, transportation, and seawater desalination, etc. However, the long induction time and the slow formation rate are critical factors affecting the application of hydrate-based technologies. Micro-nano bubbles (MNBs) can dramatically increase the formation rate of hydrates owing to their advantages of providing more nucleation sites, enhancing mass transfer, and increasing the gas–liquid interface and gas solubility. Initially, the review examines key performance MNBs on hydrate formation and dissociation processes. Specifically, a qualitative and quantitative assembly of the formation and residence characteristics of MNBs during hydrate dissociation is conducted. A review of the MNB characterization techniques to identify bubble size, rising velocity, and bubble stability is also included. Moreover, the advantages of MNBs in reinforcing hydrate formation and their internal relationship with the memory effect are summarized. Finally, combining with the current MNBs to reinforce hydrate formation technology, a new technology of gas hydrate formation by MNBs combined with ultrasound is proposed. It is anticipated that the use of MNBs could be a promising sustainable and low-cost hydrate-based technology.

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Section: Mnbs Reinforce Hydrate Formation With Memory Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast Formation of Hydrate Induced by Micro-Nano Bubbles: A Review of Current Status

et al. 2023

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The Thermodynamic and Kinetic Effects of Sodium Lignin Sulfonate on Ethylene Hydrate Formation

Wang

et al. 2021

Energies

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Hydrate-based technologies (HBTs) have high potential in many fields. The industrial application of HBTs is limited by the low conversion rate of the water into hydrate (RWH), and sodium lignin sulfonate (SLS) has the potential to solve the above problem. In order to make the HBTs in the presence of SLS applied in industry and promote the advances of commercial HBTs, the effect of SLS on the thermodynamic equilibrium hydrate formation pressure (Peq) was investigated for the first time, and a new model (which can predict the Peq) was proposed to quantitatively describe the thermodynamic effect of SLS on the hydrate formation. Then, the effects of pressure and initial SLS concentration on the hydrate formation rate (rR) at different stages in the process of hydrate formation were investigated for the first time to reveal the kinetic effect of SLS on hydrate formation. The experimental results show that SLS caused little negative thermodynamic effect on hydrate formation. The Peq of the ethylene-SLS solution system predicted by the model proposed in this work matches the experimental data well, with an average relative deviation of 1.6% and a maximum relative deviation of 4.7%. SLS increased RWH: the final RWH increased from 57.6 ± 1.6% to higher than 70.0% by using SLS, and the highest final RWH (77.0 ± 2.1%) was achieved when the initial SLS concentration was 0.1 mass%. The rR did not significantly change as RWH increased from 35% to 65% in the formation process in the presence of SLS. The effect of increasing pressure on increasing rR decreased with the increase in RWH when RWH was lower than 30%, and the difference in pressure led to little difference in the rR when RWH was higher than 30%.

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The Relationship between Thermal Characteristics and Microstructure/Composition of Carbon Dioxide Hydrate in the Presence of Cyclopentane

Cited by 2 publications

References 51 publications

Fast Formation of Hydrate Induced by Micro-Nano Bubbles: A Review of Current Status

Fast Formation of Hydrate Induced by Micro-Nano Bubbles: A Review of Current Status

The Thermodynamic and Kinetic Effects of Sodium Lignin Sulfonate on Ethylene Hydrate Formation

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