Article
Energy & Fuels
Asheesh Kumar, Chester Su Hem Yeo, Sanat Kumar, Praveen Linga
Summary: Hydrate-based technology shows potential for storing and transporting lean natural gas or biogas with high carbon dioxide content. The study on ternary methane-carbon dioxide-tetrahydrofuran (CH4-CO2-THF) system reveals minimal impact of adding CO2 on the stability of mixed CH4-THF hydrates, which can reduce energy costs for the transportation and storage of CO2 lean natural gas/biogas hydrates.
Article
Thermodynamics
Ruyi Zheng, Zhaoqi Fan, Xiaoli Li, Shahin Negahban
Summary: A new thermodynamic model was developed to improve the prediction accuracy of the equilibrium phase boundary of CH4, CO2, and binary CH4-CO2 hydrates in water. By utilizing a newly generated database, the study successfully captured the impacts of temperature, NaCl concentration, and gas composition on the phase boundary of gas hydrates. Overall, the performance of the newly developed model is satisfactory.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Energy & Fuels
Sai Kiran Burla, Bhavya Tulluru, Pinnelli S. R. Prasad
Summary: Amino acids are important additives in gas-hydrate based technology, playing a dual role as inhibitors or promoters depending on concentration. The nature of the side chain and its length are critical factors, with different amino acids affecting CO2 and CH4 hydrates differently.
Article
Engineering, Chemical
Alberto Maria Gambelli, Andrea Di Schino, Federico Rossi
Summary: Through experiments, it was found that Cu particles were able to promote methane hydrates and inhibit carbon dioxide hydrates in additive manufacturing, with the effect depending on the particle concentration and chemical properties. The results were validated by comparing them with the literature.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Environmental
Alberto Maria Gambelli, Federico Rossi
Summary: The replacement of methane with carbon dioxide is the most promising solution for natural gas hydrate exploitation, but the actual efficiency is much lower than the ideal value. This article focuses on the suitable thermodynamic region for replacement. The region effectively suitable for replacement is narrower than previously believed and lies between the dissociation curve of methane hydrates and the formation curve of CO2 hydrates. Experimental results confirm that methane recovery is significantly higher when replacing above the dissociation curve.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Lingjie Sun, Tian Wang, Bo Dong, Man Li, Lei Yang, Hongsheng Dong, Lunxiang Zhang, Jiafei Zhao, Yongchen Song
Summary: A method utilizing pressure oscillation during CH4/CO2 replacement is proposed in this study, which effectively promotes the replacement process by breaking the balance of the hydrate layer and forming a CO2/CH4 mixed hydrate layer. This newly proposed method significantly enhances the recovery of CH4 and the efficiency of CO2 sequestration.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Phakamile Ndlovu, Saeideh Babaee, Paramespri Naidoo
Summary: Vast methane hydrates found in seabeds and permafrost areas can be used as an energy source and provide a storage solution for greenhouse gases by encapsulating carbon dioxide. The article presents experimental results on the replacement process using a laboratory reactor and various additives to enhance the reaction.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Thermodynamics
Maria S. Sergeeva, Anton N. Petukhov, Dmitry N. Shablykin, Nikita A. Mokhnachev, Ilya V. Vorotyntsev, Vladimir M. Vorotyntsev
Summary: This study experimentally determined the gas hydrate dissociation pressures of the CH4-CO2 gas mixture in THF aqueous solution, and found a significant pressure decrease when THF was added within the considered temperature range.
FLUID PHASE EQUILIBRIA
(2021)
Article
Energy & Fuels
Bernadette R. Cladek, A. J. Ramirez-Cuesta, S. Michelle Everett, Marshall T. McDonnell, Luke Daemen, Yongqiang Cheng, Paulo H. B. Brant Carvalho, Christopher Tulk, Matthew G. Tucker, David J. Keffer, Claudia J. Rawn
Summary: Natural hydrate deposits are a rich source of CH4. Recent studies have shown that CH4 can be extracted from hydrates by CO2 exchange, which also has the potential for carbon sequestration. Understanding the impact of guest variation in CH4, CO2, and mixed hydrates on their stability and the processes of methane extraction and CO2 sequestration is crucial. The use of inelastic neutron scattering has revealed the dynamic modes in hydrate structures and the behavior of CH4, providing valuable insights for further research.
Article
Energy & Fuels
Qian Ouyang, Jyoti Shanker Pandey, Nicolas von Solms
Summary: Early studies have shown that multistep depressurization of CH4/CO2 mixed hydrates can simultaneously produce additional CH4 and store CO2 in hydrate-bearing sediments. This experimental work identified three critical parameters (CH4/CO2 ratio, residual water saturation, and shut-in period) and investigated their effects on production parameters. The results showed that low residual water saturation and a higher CH4/CO2 ratio in CH4/CO2 mixed hydrates resulted in optimal production parameters. Additionally, the shut-in period between pressure releases had a direct effect on production and storage performances. The importance of these critical parameters in designing an effective production and storage scheme after CO2 injection into CH4 hydrates was demonstrated.
Article
Thermodynamics
Qian Ouyang, Jyoti Shanker Pandey, Nicolas von Solms
Summary: This study investigated the dissociation characteristics of CH4/CO2 hydrates in unconsolidated sediments using slow multistep depressurization. The results showed that CO2 was preferably encaged in hydrate than CH4, especially in unconsolidated sediments. CH4-rich hydrates in unconsolidated sediments could be effectively exploited through multistep depressurization, with higher CH4 recovery at lower depletion pressure.
Article
Engineering, Chemical
Zucheng Cheng, Weiguo Liu, Shaohua Li, Sijia Wang, Yingying Liu, Xiang Sun, Cong Chen, Lanlan Jiang, Yongchen Song
Summary: This study evaluated the performance of SDS in the separation efficiency of simulated biogas. The experimental results showed that higher driving forces led to a significant increase in gas capture, dominated by the CH4 component. Hydrate growth mainly occurred in the liquid phase, and the separation factor was positively correlated with the induction time. Gas capture per unit volume of solution could be improved at higher gas-liquid ratios, while high-pressure failure behavior was observed. The defoamer had no significant effect on hydrate generation kinetics and separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Mengya Niu, Guozhong Wu, Zhenyuan Yin, Yifei Sun, Kai Liu, Daoyi Chen
Summary: The study demonstrates that recovery of CH4 hydrate at marine conditions through CO2-N2 gas injection is technically feasible, but careful control of the composition of the mixed gas is required to ensure replacement efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Namrata Gaikwad, Gaurav Bhattacharjee, Jitendra S. Sangwai, Rajnish Kumar, Praveen Linga
Summary: This study investigates the kinetics and morphology of hydrate crystal growth in gas-water and gas-liquid hydrocarbon-water systems using different additives. The addition of tryptophan significantly enhances gas uptake and hydrate formation rate. In the gas-liquid hydrocarbon-water system, the presence of water-insoluble Cyclo-O hinders mass transfer between gas and bulk water phase, resulting in cloudlike hydrate formation.
Article
Chemistry, Multidisciplinary
Sanehiro Muromachi, Satoshi Takeya, Saman Alavi, John A. Ripmeester
Summary: The crystal structure of tetra-n-butylammonium chloride (TBAC) + CO2 semiclathrate hydrate, known for its high CO2 selectivity, was studied using single crystal X-ray diffraction. The study revealed that the CO2 gas occupies dodecahedral (D) cages along with water and chloride ions. Different types of D cages were observed, with the ratio of D-L:D-M:D-N as 2:2:1. The CO2 molecules were found in distorted D-M and D-N cages, while chloride ions were partially present in D-M cages. The spatial distribution of CO2 in the cages was limited due to the distortion of D-M and D-N cages. The study also highlighted the superior CO2 capture preference of TBAC hydrate.
Article
Thermodynamics
Jie Yi, Dong-Liang Zhong, Jin Yan, Yi-Yu Lu
Article
Crystallography
Zheng Li, Dong-Liang Zhong, Wei-Yan Zheng, Jin Yan, Yi-Yu Lu, Da-Tong Yi
JOURNAL OF CRYSTAL GROWTH
(2019)
Article
Energy & Fuels
Zheng Li, Christine C. Holzammer, Andreas S. Braeuer
Article
Thermodynamics
Yi-Yu Lu, Bin-Bin Ge, Dong-Liang Zhong
Article
Energy & Fuels
Jian-Bo Li, Dong-Liang Zhong, Jin Yan
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Review
Energy & Fuels
Xi-Yue Li, Bin-Bin Ge, Jin Yan, Yi-Yu Lu, Dong-Liang Zhong, Peter Englezos, Bao-Yong Zhang
Summary: The consumption of natural gas is vital for optimizing China's energy structure towards reduced CO2 emissions. Coalbed methane is recognized as a significant energy resource to supplement conventional fossil fuels. The hydrate-based gas separation technology has shown promise for purifying low-concentration coalbed methane, but challenges remain in achieving milder pressure conditions and enhancing hydrate formation rates. Further research is needed to bridge the gap between gas separation science and technology.
Article
Energy & Fuels
Xiao-Yan Deng, Ying Yang, Dong-Liang Zhong, Xi-Yue Li, Bin-Bin Ge, Jin Yan
Summary: This study investigates the morphology and kinetics of CO2 hydrate formation in the presence of sodium dodecyl sulfate (SDS). It was found that the growth of CO2 hydrate above the gas-liquid interface became stronger with higher SDS concentration, indicating an enhanced promoting effect of SDS on CO2 hydrate formation. The highest efficiency for CO2 hydrate formation was achieved at 1500 and 3000 ppm of SDS, showing potential for improving hydrate-based CO2 capture technology in the future.
Article
Thermodynamics
Feng-Mei Xie, Xi-Yue Li, Dong-Liang Zhong, Peter Englezos, Guo-Xiang Lu
Summary: This study demonstrates the phase behavior of TBPB and CO2 hydrates at different concentrations, with the addition of surfactant affecting phase equilibrium and CO2 consumption during formation. Further research should focus on increasing the CO2 storage capacity of TBPB semiclathrate hydrate.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Engineering, Chemical
Wen-Xin Dai, Xi-Yue Li, Dong-Liang Zhong, Jin Yan, Kai Dong, Xiao-Yan Deng
Summary: This study investigates the use of a fixed bed of activated carbons to capture CO2 at hydrate formation conditions. The results show that an adsorption-hydration hybrid process in wet activated carbons outperforms single adsorption process in dry activated carbons for CO2 capture. The optimal water saturation value for gas consumption is found to be 40%.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Liang-Meng Wu, Xi-Yue Li, Feng-Mei Xie, Dong-Liang Zhong, Peter Englezos, Jin Yan
Summary: This study presents a review of kinetic studies on the enhancement of hydrate-based CO2 capture using additives, porous media, nanofluids, etc. Future research directions are also discussed. The aim of this review is to aid understanding of the mechanism of the hydrate-based CO2 capture process and provide references for its industrial applications in the near future.
Article
Engineering, Chemical
Bin-Bin Ge, Jin Yan, Dong-Liang Zhong, Yi-Yu Lu, Xi-Yue Li
Summary: CO2 capture was experimentally investigated by forming TBAB semiclathrate in a new system of TBAB + graphite nanofluids. The system of TBAB + graphite nanofluids showed preference for CO2 capture compared to TBAB solution and TBAB + SDS solution. The optimal concentration of 0.2 wt.% graphite nanoparticles was found to enhance hydrate growth in TBAB + graphite nanofluids.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Kai Dong, Wen-Xin Dai, Dong-Liang Zhong, Jin Yan, Feng-Mei Xie, Han-Sen Sun, Man Wang
Summary: This study investigates the effects of the surfactant cocamidopropyl betaine (CAB) on coal structures and CH4 adsorption characteristics. The results show that the hydrophilicity of coal samples is enhanced after being treated with CAB solutions, increasing the number of hydroxyl functional groups and reducing the amount of adsorbed CH4. Additionally, the pore volume of coal samples increases and the CBM migration rate improves. A concentration of 0.008 mol/L CAB is determined to be the optimal concentration for increasing CBM extraction efficiency.
Article
Engineering, Chemical
Xi-Yue Li, Jin Yan, Dong-Liang Zhong, Shi-Jian Lu, Bin-Bin Ge
Summary: This study investigated the formation of tetra-n-butyl ammonium bromide (TBAB) semiclathrate hydrate for CO2 capture through experiments and in situ Raman spectroscopy. The impacts of TBAB concentration and operating temperature on CO2 incorporation into TBAB semiclathrates were analyzed. The results showed that the structure transition of TBAB semiclathrates from type A to type B occurred in the presence of CO2, resulting in increased CO2 consumption. The TBAB semiclathrate formed at 2.57 mol % TBAB and 282.15 K was found to be a suitable system for CO2 capture.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Bin-Bin Ge, Dong-Liang Zhong, Yi-Yu Lu, Xi-Yue Li
Summary: The effect of THF concentration on the formation of THF-CH4 hydrate was investigated. It was found that THF concentration is a key factor affecting the growth of hydrates, and increasing THF concentration improves mass transfer. In situ Raman spectroscopy observation showed that CH4 and THF molecules occupy the small and large cavities of the sII hydrate, respectively. Forming two types of hydrates at a low concentration can increase gas storage capacity.
Proceedings Paper
Energy & Fuels
Bin-Bin Ge, Dong-Liang Zhong, Yi-Yu Lu
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)