Article
Energy & Fuels
Liu Chenwei, Zhou Chenru, Li Mingzhong, Tong Shikun, Qi Minhui, Wang Zhiyuan
Summary: This study measured the interaction forces between methane hydrate particles at high pressure using a custom-built high-pressure micromechanical force device. It found that the cohesion forces between hydrate particles increase with contact time and decrease with annealing time and subcooling. The adhesion forces between hydrate particles and water droplets are much stronger and are influenced by subcooling and contact time. This study provides insights into the agglomeration mechanism of hydrates in gas pipelines and contributes to evaluating hydrate plugging risk.
Article
Energy & Fuels
Wang Weiyang, Zhou Chenru, Liu Chenwei, Wang Zhiyuan, Li Mingzhong
Summary: This study investigated the interaction behaviors of hydrate particle-particle/droplet and hydrate deposition-pipe wall in the cyclopentane (CyC5) vapor phase. The results showed that hydrate formation rate is higher in the vapor phase compared to the liquid CyC5 phase. The hydrate particle-particle adhesion forces slightly increase with temperature in the vapor phase, and the hydrate-droplet adhesion forces change with the conversion of water in liquid bridges. The adhesion strengths of hydrate deposition increase with substrate roughness and formation/annealing time, but decrease with temperature.
Article
Energy & Fuels
Wang Weiyang, Zhou Chenru, Liu Chenwei, Wang Zhiyuan, Li Mingzhong
Summary: This study experimentally investigated the interaction behaviors of hydrate particle-particle/droplet and hydrate deposition-pipe wall in the cyclopentane vapor phase. It found that hydrate formation in the vapor phase is a fast-growing process with rough particle surfaces exhibiting strong hydrophilic characteristics. The adhesion forces between hydrate particles in the vapor phase slightly increase with temperature and are approximately 2-3 times higher than in the liquid cyclopentane phase. In the case of hydrate deposition, the adhesion strengths increase with substrate roughness and formation/annealing time, but decrease with temperature.
Article
Engineering, Chemical
Anton P. Semenov, Rais I. Mendgaziev, Vladimir A. Istomin, Daria Sergeeva, Vladimir A. Vinokurov, Yinghua Gong, Tianduo Li, Andrey S. Stoporev
Summary: This study experimentally confirmed the synergistic effect of methanol and magnesium chloride in improving the inhibitory properties of methanol in gas hydrate formation. This combination can reduce inhibitor losses and minimize environmental impact.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Geochemistry & Geophysics
David Fukuyama, Hugh C. Daigle, Michael A. Nole, Wen Song
Summary: Short-range diffusion and long-range advection are the main mechanisms for transporting methane. This study introduces a new mechanism, density-driven convection, which is driven by hydrate formation and salt exclusion in the pore water. The study demonstrates the rapid transport of aqueous methane throughout the sand layer with convection compared with diffusion.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Energy & Fuels
Evgeny Chuvilin, Valentina Ekimova, Dinara Davletshina, Ekaterina Krivokhat, Vladimir Shilenkov, Boris Bukhanov
Summary: The development of the Arctic region faces challenges such as methane emission from permafrost. While the effects of temperature and pressure on gas hydrates have been studied, the chemical effects, such as salt migration, remain poorly understood. This study investigates the interaction of frozen hydrate-saturated sediments with NaCl solutions under different gas pressures.
Article
Energy & Fuels
Changrui Shi, Shuai Wang, Huiquan Liu, Lunxiang Zhang, Mingjun Yang, Yongchen Song, Jiafei Zhao, Zheng Ling
Summary: This study presents a simple and scalable strategy to produce aerogels as efficient promoters for methane hydrate formation. The as-made aerogels significantly improve the formation kinetics of methane hydrate and show high storage capacity and cycling stability. The study also investigates the molecular mechanisms behind the enhanced formation of methane hydrate through the interaction between oxygen-containing surface functional groups and water molecules.
Article
Energy & Fuels
Jun Chen, Yaosong Zeng, Chenzhe Liu, Mengqi Kang, Guangjin Chen, Bin Deng, Fanhua Zeng
Summary: This study shows that different types of anti-agglomerants have different effects on methane hydrate dissociation, and water cut and anti-agglomerant dosage also affect dissociation. The increase of water cut significantly increases the maximum dissociation rate.
Article
Energy & Fuels
Fulong Ning, Dongdong Guo, Shahab Ud Din, Heen Zhang, Wenjia Ou, Bin Fang, Yongsheng Liang, Ling Zhang, Kyungbook Lee, Carolyn A. Koh
Summary: This study investigates the effects of different types and concentrations of anti-agglomerants/surfactants on the formation kinetics of CH4 hydrate. The results show that anti-agglomerants/surfactants can promote hydrate formation in pure water and high water cut systems, while they slow down or prevent hydrate nucleation and growth in low water cut systems.
Article
Energy & Fuels
Ya-Ting Xu, Yi Wang, Xiao-Sen Li, Xiao-Yan Li, Gang Li, Fu-Cheng Deng
Summary: The characteristics of hydrate-bearing sediments make the production of natural gas hydrates difficult. This study investigated sand production behaviors in methane hydrate reservoirs with different particle size quartz sands and found that particle size has an impact on particle migration.
Article
Energy & Fuels
Ya-Ting Xu, Yi Wang, Xiao-Sen Li, Xiao-Yan Li, Gang Li, Fu-Cheng Deng
Summary: This study investigates the sand production behaviors in methane hydrate reservoirs with different particle size quartz sands through experiments and analysis. The relationship between the particle size and reservoir damage is also explored. The experimental results show that there is a certain particle size that is beneficial for particle migration, and the reservoir particle size is positively correlated with the amount of sand production. Moreover, based on the different particle sizes, optimization recommendations for the wellbore position are proposed to avoid sand production.
Article
Energy & Fuels
Man Huang, Zhirui Zhao, Dongchao Su, Lianghong Wu, Fanfan Qin, Meixia Zhang, Fulong Ning
Summary: To improve gas production in natural gas hydrate (NGH) reservoirs, a new method called radial water jet slotting and grouting (RWJSG) was proposed. A 3D gas production model based on the NGH reservoir in the South China Sea was constructed to evaluate the effectiveness of RWJSG. The results showed that RWJSG can effectively enhance gas recovery, with significant increases in hydrate dissociation efficiency, cumulative gas production, and gas to water production ratio.
Article
Energy & Fuels
Bin Fang, Tao Lu, Liwei Cheng, Dongdong Wang, Yang Ni, Bowen Fan, Jiuling Meng, Thijs J. H. Vlugt, Fulong Ning
Summary: This study used molecular dynamics simulations to investigate the behavior of NaCl solution invasion into hydrates and its effects on dissociation kinetics. Results showed that salt invasion decelerated dissociation, but at high concentrations it could somewhat accelerate it while hindering methane release.
Article
Chemistry, Multidisciplinary
Nur Aminatulmimi Ismail, Carolyn A. Koh
Summary: Understanding the effect of salt on gas hydrate crystal growth is crucial for advanced gas hydrate management and application. The growth of THF hydrate single crystals in the presence of salt inhibits crystal growth and leads to the formation of parallel intergrowths of octahedral hydrate crystals.
Article
Energy & Fuels
Jie Wang, Ziyi Yao, Runpu Gong, Panyang Guo, Houshun Jiang, Yang Wang
Summary: This paper develops a high-efficiency hydrate inhibition drilling fluid system based on the evaluation and analysis of the synergistic effect between commonly used kinetic inhibitors and thermodynamic inhibitors. The results provide a reference for solving the stability and safety problems in the process of hydrate drilling.
Article
Thermodynamics
J. N. Zappey, E. E. Moore, O. Benes, J. -c. Griveau, R. J. M. Konings
Summary: In this study, the heat properties of technetium metal were measured and analyzed using various thermal measurement methods, including its superconductivity, zero-degree Debye temperature, electronic heat capacity coefficient, and the standard entropy of the superconducting state.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Pengshuai Zhang, Jixiu Deng, Xiaoyu Jiang, Liang Xu, Yu Huang, Han Sun, Mi Gao, Xianghan Wang, Yulong Gao, Kangning Fan, Lu Zhang, Shuoye Yang
Summary: In this study, the solubility of daminozide in twelve neat solvents was determined using the gravimetrical method. Various models were employed to analyze the experimental solubility, and the miscibility of daminozide in the selected solvents was discussed based on Hansen solubility parameters. The results showed that the dissolution mechanism of daminozide in all solvents was entropy-driven.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Jinju Ma, Hao Wu, Dongxu Yi, Wei Liu, Xinding Yao, Tao Li, Baozeng Ren
Summary: In this study, the solubility and compatibility of Agomelatine in different solvents were investigated through experimental and simulation methods. The results showed that Agomelatine forms more stable hydrogen bonds with alcohol solvents compared to other ester solvents. Additionally, the study analyzed the acidity and basicity characteristics of Agomelatine as well as the reasons for differences in solubility.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Angelica V. Sharapova, Marina V. Ol'khovich, Svetlana V. Blokhina
Summary: This study determined the key physico-chemical properties of cardiovascular carvedilol (CVD) in terms of solubility and distribution coefficients in modeling solvents and biphasic systems. The results showed that the solubility of CVD varied significantly depending on the solvent and pH conditions, and the dissolution process deviated from ideality in saturated solutions.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Wenxi Song, Na Wang, Mingzhe Tan, Meng Wang, Xin Huang, Ting Wang, Hongxun Hao
Summary: The solubility and thermodynamic behavior of climbazole in different solvents were investigated in this study. The results showed that solubility is influenced by temperature and solvent properties. Furthermore, the solvent effect was evaluated and the molecular mechanism behind the solubility behavior was revealed using solvation energy relationship models and molecular simulation methods.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Yuqi Su, Weijie Jia, Junshuai Chen, Songtao Cao, Maogang He, Ying Zhang
Summary: This paper presents a novel measurement method based on the finite volume method (FVM) for measuring the concentration-dependent mutual diffusion coefficient D(C) in binary solution. The measurement principle was derived by integrating Fick's second law and establishing discretization equation. The method was validated through experiments and a semi-empirical correlation was built to study the temperature and concentration influences on the diffusion coefficient D.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Bo Tang, Xiaoyu Yao, Xueqiang Dong, Bowen Sheng, Yanxing Zhao, Jun Shen, Maoqiong Gong
Summary: In this study, metal-bellows variable volumetry was used to measure the saturated vapor pressures and critical parameters of R1234ze(Z) and R1336mzz(Z). New vapor pressure correlations were formulated based on the obtained data. The low uncertainties of the measured values indicate the reliability and reproducibility of the data. The results provide important thermophysical data for the use and optimization of R1234ze(Z) and R1336mzz(Z) in HTHP systems.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Vivek Pathania, Ankita Garg, Navneet Kaur, Neha
Summary: The interaction between Isoniazid and beta-cyclodextrin in solutions was investigated to understand the molecular interactions between different components. The results showed that the interaction between Isoniazid and beta-cyclodextrin affected the volume and compressibility of the solutions, and the hydration behavior of Isoniazid in the solutions was influenced by the cosolvent.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Mauricio Vega-Teijido, Marc E. Segovia, Martina Kieninger, Oscar N. Ventura
Summary: A composite chemical model, SVECV-f12, has been developed to accurately reproduce barrier heights of hydrocarbon species. The model successfully corrects systematic errors between experimental and theoretical values and is used for predicting formation enthalpies and hydrogenation/isomerization enthalpies.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Kemal Ozcan, Aylin Boztepe, Erdog an Tarcan, Cagatay Tasdemirci
Summary: In this study, the enthalpy of combustion of methane, the main component of natural gas, was measured using a reference gas calorimeter. The experimental results were compared with the values specified in ISO 6976:2016. The average enthalpy of combustion was determined as -55518.2 kJ kg-1 with an error of 0.2%.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Kouki Mekaru, Takuto Miyagi, Ayaka Mishima, Isami Uehara, Ryo Ohmura, Keita Yasuda
Summary: This study investigated the four-phase equilibrium conditions of carbon dioxide + cyclopentane double clathrate hydrate forming systems coexisting with sodium chloride aqueous solution or pure water. The results showed that the double clathrate hydrate is more thermodynamically stable than simple clathrate hydrates under a given sodium chloride concentration.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Yameng Wan, Xiaoqiang Gao, Ruiai Wang, Fanfan Li, Yanxun Li, Haixia He
Summary: This study evaluated the solubility of Iminostilbene (IMB) in twelve organic solvents and found that the solubility increased with temperature and showed a specific order in different solvents. The analysis of molecular interactions and solubility parameters provided insights into the dissolution behavior. The UNIQUAC model was used to fit the solubility data, and the thermodynamic properties of the mixing and dissolution processes were thoroughly evaluated.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Yinan Liu, Mingcheng Li, Chunying Zhu, Xiqun Gao, Youguang Ma
Summary: This study successfully prepared amine-based functionalized deep eutectic solvents and investigated the effects of solvent composition, water content, and temperature on the properties of the solvent through density and viscosity measurements. The results contribute to a better understanding of hydration and intermolecular interactions in deep eutectic solvents.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Correction
Thermodynamics
Deepak Parmar, Kavitha Kumari, Naveen Kumar, Manju Rani, Mustapha Sahal, Sanjeev Maken
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Thermodynamics
Ruslan N. Nagrimanov, Aliya R. Ibragimova, Boris N. Solomonov
Summary: In this study, the heats of solution of hydrocarbons and alcohols with 2-methyltetrahydrofuran are systematically analyzed. Structure-property relationships are developed to calculate the enthalpy of solvation of aliphatic alcohols in 2-methyltetrahydrofuran. Specific interactions in the alcohol-2-methyltetrahydrofuran systems are determined to better understand intermolecular interactions in 2-methyltetrahydrofuran solutions. This research provides valuable insights into the properties and energies of these interactions, facilitating the transition to more environmentally friendly solvents.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)