Chang‐Yu Sun

China University of Petroleum, Beijing

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Guangjin Chen

China University of Petroleum, Beijing

216

Bei Liu

China University of Petroleum, Beijing

Peng Xiao

Ningbo Institute of Industrial Technology

Qingping Li

Ocean University of China

Bei Liu

China University of Petroleum, Beijing

Qing-Lan Ma

China University of Petroleum, Beijing

Yi-Fei Sun

Tsinghua University

Lan-Ying Yang

China University of Petroleum, Beijing

Weixin Pang

China National Offshore Oil Corporation (China)

Chun Deng

China University of Petroleum, Beijing

Cooperative Institutions

China University of Petroleum, Beijing

236

Chinese Academy of Sciences

University of Chinese Academy of Sciences

University of Wisconsin–Madison

China University of Petroleum, East China

Peking University

Zhejiang University

Tsinghua University

Sichuan University

Dalian University of Technology

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An approach to highly efficient filtration of methane hydrate slurry for the continuous hydrate production

Energy (2022)

Peng Xiao Baocan Dong Jia Li Hongliang Zhang Guangjin Chen

Clathrate hydrate

Filtration (mathematics)

10.1016/j.energy.2022.124892

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Citations (4)

Effect of Reciprocating Impact on Methane Hydrate Formation and Dissociation

Energy & Fuels (2020)

Peng Xiao Guangjin Chen Chang‐Yu Sun Liwei Cheng Xing Huang

Morphology observation is an important approach to studying the mechanism of one method of improving hydrate formation. In this study, morphology change in methane hydrate formation and dissociation was investigated at 274.15 K to study the promoting mechanism of reciprocating impact on hydrate formation. The results suggested that, under reciprocating impact, a synthetic effect consisted of the agitating of water and the extruding of water, and the forming and fracturing of hydrate shells significantly improved the hydrate formation. The hydrate shells formed in hydrate slurry were the key factor that affected the formation kinetics in hydrate slurry and after the hard hydrate block had formed. On the basis of the excellent water conversion under reciprocating impact, the impact method was adopted to study the re-formation of methane hydrate. The results indicated that the memory effect not only affected the nucleation rate but also influenced the gas storage capacity and the morphology of re-formed hydrate. The performance of the memory effect in hydrate re-formation perhaps was affected by the melting time via regulating the amount of residual structures in the meltwater. The induction time was found to increase with the decrease of the melting time. The storage capacity of the re-formed hydrate increased with the increase of melting time, and when hydrate re-formed in meltwater that experienced a long melting time, the storage capacity of re-formed hydrate was close to that formed in fresh water. Conversely, a large amount of free water remained in the reactor when meltwater with short melting time was used. The results of this study could be helpful in improving the impact reactor and applying the memory effect to accelerate hydrate formation.

Clathrate hydrate

Meltwater

Reciprocating motion

10.1021/acs.energyfuels.0c03641

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Citations (11)

Hydrate phase equilibrium and structure for (methane+ethane+tetrahydrofuran+water) system

The Journal of Chemical Thermodynamics (2010)

Chang‐Yu Sun Guangjin Chen Lingwei Zhang

Tetrahydrofuran

Clathrate hydrate

Mole fraction

Alkane

10.1016/j.jct.2010.04.021

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Citations (51)

Fundamental mechanisms and phenomena of clathrate hydrate nucleation

Chinese Journal of Chemical Engineering (2019)

Jinlong Cui Zhen-Feng Sun Xiaohui Wang Bin Yu Shudong Leng

Clathrate hydrate

Flow Assurance

10.1016/j.cjche.2018.12.016

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Citations (40)

A novel method to improve the gas storage capacity of ZIF-8

Journal of Materials Chemistry (2012)

Liang Mu Bei Liu Huang Liu Yuntao Yang Chang‐Yu Sun

In this work a novel method for enhancing the gas storage capacity of metal–organic frameworks (MOFs), i.e. saturating the MOF with a suitable quantity of water and forming hydrates in it, was proposed. Commercialized ZIF-8 was adopted as it is very stable under an atmosphere of water. The adsorption and hydrate formation behaviors of methane in wet ZIF-8 with five different water contents (0.0%, 16.3%, 27.7%, 30.6%, and 35.1%, mass percentages) were investigated under hydrate formation conditions and the storage capacities of both ZIF-8 frameworks and ZIF-8 particle beds were determined. Our results show that hydrates can form in wet ZIF-8 pores and thus increase the overall storage capacities of both ZIF-8 frameworks and ZIF-8 particle beds remarkably. The contribution of hydrates to the total gas uptake of a ZIF-8 framework can be as high as 45%. Compared with dry ZIF-8 frameworks, the net storage capacity of the wet analogue with a water content of 35.1% increases from 5.954 to 9.304 mmol g−1 at 269.15 K and 2.85 MPa, in other words, raised by more than 56%. The ideal volume storage capacity of the wet ZIF-8 framework can achieve more than 190 V/V at 3.0 MPa or so, 7% higher than the DOE target (180 V/V) for methane storage. In addition, our SEM measurements and XRD analysis demonstrate that ZIF-8 is stable during the saturation and hydrate formation processes, illustrating that it can be used repeatedly.

Clathrate hydrate

Saturation (graph theory)

10.1039/c2jm31541f

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Citations (173)

Self-preservation and structural transition of gas hydrates during dissociation below the ice point: an in situ study using Raman spectroscopy

Scientific Reports (2016)

Jin‐Rong Zhong Xin-Yang Zeng Feng-He Zhou Qi-Dong Ran Chang‐Yu Sun

Abstract The hydrate structure type and dissociation behavior for pure methane and methane-ethane hydrates at temperatures below the ice point and atmospheric pressure were investigated using in situ Raman spectroscopic analysis. The self-preservation effect of sI methane hydrate is significant at lower temperatures (268.15 to 270.15 K), as determined by the stable C-H region Raman peaks and A L / A S value (Ratio of total peak area corresponding to occupancies of guest molecules in large cavities to small cavities) being around 3.0. However, it was reduced at higher temperatures (271.15 K and 272.15 K), as shown from the dramatic change in Raman spectra and fluctuations in A L / A S values. The self-preservation effect for methane-ethane double hydrate is observed at temperatures lower than 271.15 K. The structure transition from sI to sII occurred during the methane-ethane hydrate decomposition process, which was clearly identified by the shift in peak positions and the change in relative peak intensities at temperatures from 269.15 K to 271.15 K. Further investigation shows that the selectivity for self-preservation of methane over ethane leads to the structure transition; this kind of selectivity increases with decreasing temperature. This work provides new insight into the kinetic behavior of hydrate dissociation below the ice point.

Clathrate hydrate

10.1038/srep38855

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Citations (49)

Relationship between the interfacial tension and inhibition performance of hydrate inhibitors

Chemical Engineering Science (2016)

Huibo Qin Chang‐Yu Sun Zhen-Feng Sun Bei Liu Guangjin Chen

Clathrate hydrate

Amide

10.1016/j.ces.2016.04.002

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Citations (47)

Phase Equilibria of Natural Gas Hydrates in Bulk Brine and Marine Sediments from the South China Sea

Journal of Chemical & Engineering Data (2021)

Lantao Geng Jin Cai Cheng Lü Xuwen Qin Rongrong Qi

Studies on gas hydrate phase equilibrium conditions are reported widely in the literature. However, the data available for natural gas hydrates (NGHs) in real marine conditions are limited. In this study, NGH dissociation conditions in bulk brine and marine sediments were measured by using a microdifferential scanning calorimetry (μ-DSC). The sediments used in the experiment were obtained from the Shenhu area of the South China Sea, and the natural gas, as well as part of the water samples, were prepared according to the field data. Additionally, the Chen-Guo model was improved to calculate the NGH equilibrium conditions in the systems containing electrolytes and porous sediments. The experimental results showed that the NGH is relatively more stable than pure CH4 hydrate. The hydrate phase equilibrium curves shift to the left with the increased salinity in bulk water and sediments. In addition, the hydrate decomposition temperatures in marine sediments are obviously lower than those in bulk water. The average deviations of the improved model are 2.32% and 3.7% for bulk brine and sediments, respectively, which indicates great predictability. We consider that besides pore size as the main factor affecting the hydrate phase equilibrium, the water absorption capacity of marine sediments can also affect their decomposition conditions. The hydrate decomposition enthalpies were calculated by the Clausius–Clapeyron equation, and the results showed that the enthalpies increased with the decreased salinity and the addition of marine sediments. These findings are significant to NGH production safety in real marine sediments.

Brine

Clathrate hydrate

China sea

10.1021/acs.jced.1c00307

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Citations (12)

CCDC 1062611: Experimental Crystal Structure Determination

The Cambridge Structural Database (2015)

Rui‐Qin Zhong Jia Liu Xing Huang YU Xiao-feng Chang‐Yu Sun

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc14nqs9

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Citations (0)

Highly efficient synthesis of cyclic carbonate with CO2 under mild condition catalyzed by deep eutectic solvents in a microreactor

Molecular Catalysis (2023)

Dengfeng Cui Yifan Liu Yunong Li Jiaqi wang Fang Liu

Microreactor

Space velocity

Propane

Propylene carbonate

Microchannel

10.1016/j.mcat.2023.113177

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Citations (4)