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
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
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
Energy & Fuels
Tulluru Bhavya, Burla Sai Kiran, Pinnelli S. R. Prasad
Summary: Clathrate hydrates are ideal for storing methane and carbon dioxide, but inefficient conversion and slow kinetics are major obstacles. Adding amino acids in lower dosages can accelerate the conversion process. In static conditions, l-phe and l-thr inhibit CO2 hydrate formation, while l-met and l-val act as promoters.
Article
Engineering, Environmental
Chanjuan Liu, Zhen Long, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study investigates the growth and storage performance of CO2 hydrates under different conditions, and finds that the water film on silica gel particles is the main factor affecting gas storage efficiency. Silica gels with 30% water saturation can achieve the highest CO2 storage capacity. In addition, it is found that SDS can increase the CO2 storage volume ratio under high water saturation and reduce the volume ratio decay in repeated tests.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Yi Lu, Hui Wang, Qingping Li, Xin Lv, Yang Ge, Lunxiang Zhang, Jiafei Zhao, Lei Yang, Yongchen Song
Summary: This study validates the feasibility of hydrate-based gas storage method for low-concentration flue gas through molecular dynamics simulations. The results show that proper subcooling can improve the hydrate growth rate and the occupancy of CO2 molecules in newly formed hydrate cages.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
S. Blazquez, M. M. Conde, C. Vega, E. Sanz
Summary: CO2 and CH4 hydrates are important both energetically and environmentally. Molecular dynamics simulations reveal that the growth rate of these hydrates is affected by the incorporation of guest molecules, with CO2 hydrate growing faster due to higher solubility. Additionally, higher temperatures require more molecular motion for solid growth. Our calculations show good agreement with experiments of hydrate growth along the guest-solution interface, but further work is needed to reconcile different experimental results.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Thermodynamics
Sanehiro Muromachi
Summary: This study investigates the CO2 capture properties of semiclathrate hydrates formed with different salts, showing that they almost exclusively capture CO2. Among the salts, TBPB exhibits superior gas capture performance, while TBAC captures the least amount of CO2.
Review
Energy & Fuels
Salvatore F. Cannone, Andrea Lanzini, Massimo Santarelli
Summary: Natural gas is seen as a useful transition fuel to reduce emissions from conventional power plants, particularly when considering the removal of carbon dioxide from hydrates using membrane separation technology. The economic analysis and technical aspects of this process are explored in detail, alongside discussions of other carbon capture methods and long-distance CO2 transportation and storage.
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
Energy & Fuels
Moeinoddin Naseh, Cavus Falamaki, Vahid Mohebbi
Summary: This study investigates the equilibrium conditions for gas hydrate formation from propane and carbon dioxide gas mixtures in pure water and low saline aqueous solutions. The results show that the addition of propane above 20% does not significantly affect the hydrate equilibrium condition. Experiments have been carried out and a good agreement between the experimental data and thermodynamic model calculations has been observed.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Yuanze Sun, Keyao Li, Yan Su, Jijun Zhao
Summary: This study provides deep insights into the stability mechanism of clathrate hydrates, specifically focusing on the crystal structures and chemical potential phase diagrams of sII hydrates encapsulated with CO2 molecules. The research shows that both partially occupied and fully occupied hydrates are thermodynamically stable under certain pressure and temperature conditions, with the equilibrium temperature decreasing as the relative CO2 chemical potential increases at the same pressure.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
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
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.
