Article
Chemistry, Multidisciplinary
Pinqiang Cao, Jianlong Sheng, Henrik Andersen Sveinsson, Jianyang Wu, Fulong Ning
Summary: This study explores the effects of external static electric fields on the structural instability and mechanical properties of methane hydrates using molecular dynamics simulation methods. The results show that strong electric fields can distort and dissociate local water cages in methane hydrates, weakening their mechanical properties. Instability failure modes are attributed to reorientations of water molecules and molecular diffusions.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Burla Sai Kiran, Pinnelli S. R. Prasad
Summary: This study investigates the thermodynamic inhibition capacity of natural biopowders on methane hydrate formation, showing that these biopowders exhibit efficient inhibition at low dosages and play a positive role in the hydrate formation process. The addition of small quantities of biopowders reduces the use of synthetic chemicals and serves to control hydrate formation in real-time applications.
Article
Energy & Fuels
Gustavo A. B. Sandoval, Marcio Couto Ozorio, Monica F. Naccache, Paulo R. de Souza Mendes, Amadeu K. Sum, Leandro Valim, Adriana Teixeira
Summary: This work presents a rheological analysis of cyclopentane hydrates formed in water-in-oil emulsions, investigating the influence of parameters such as pretreatment temperatures and cooling/heating rates. The study shows that the resulting hydrate slurry exhibits elasticity and shear thinning behavior, likely caused by breakdown of hydrate structures and alignment of hydrate agglomerates to the flow.
Article
Chemistry, Multidisciplinary
Feng Zhang, Hao Ni, Yi Wang, Fujun Xia, Baojun Wei, Xuefeng Liu
Summary: By using classical molecular dynamics simulations, the mechanical stability of CO2-N2 heteroclathrate hydrates (CNHHs) under uniaxial loading was investigated. The ratio of CO2 to N2 in the large and small water cages was found to have a crucial effect on the mechanical properties and fracture behaviors of CNHHs. The occupancy of small cages by CO2 was identified as a decisive factor affecting fracture position, leading to brittle or ductile fracture behavior. These findings provide insights into the deformation and fracture mechanisms of heteroclathrate hydrates and the impact of CO2 sequestration on the stability of gas hydrate reservoirs.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Engineering, Environmental
Xiaofang Li, Ping Wang, Sen Wang, Qihong Feng, Qingzhong Xue
Summary: Through molecular dynamics simulations, the miscible behavior between hydrocarbon gas and crude oil in nanoslits was investigated, revealing that longer chain length of hydrocarbon gas enhances miscibility with crude oil, while increasing polarity of crude oil reduces miscibility with hydrocarbon gas.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Haizatul Hafizah Hussain, Shaharin Anwar Sulaiman, Girma Tadesse Chala, Hazlina Husin
Summary: Transportation of waxy crude oil often faces flow assurance issues, such as wax deposition, which leads to operational complexity during pipeline restart after shutdown. This study investigates the effect of crude oil and nitrogen gas flow rates on the time taken for crude oil flow initiation. Results show that the presence of nitrogen gas improved pipeline restart phase by reducing both restart pressure and flow initiation time.
Article
Green & Sustainable Science & Technology
Zhaohong Li, Jianfeng Hou, Jianfeng Zhang
Summary: This paper examines the risk spillover effect of the Shanghai crude oil futures market on the exchange rate market and the international crude oil market. The research findings indicate that the Shanghai crude oil futures market has an inverse volatility spillover effect on the onshore exchange rate market and a two-way positive volatility spillover effect on the offshore exchange rate market. Additionally, there is a significant two-way risk spillover between the offshore exchange rate market and the international crude oil market, and a downward risk spillover between the international crude oil market and the onshore exchange rate market.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Polymer Science
Xuemin Zhang, Huifang Chu, Houbu Li, Guoquan Qi, Jinmao Feng, Xiong Gao, Wenhui Yang
Summary: This study investigates the permeability of CH4 gas in PVDF pipes containing crude oil. The results show that CH4 solubility in oil-containing PVDF is lower and diffusion coefficient is higher compared to pure PVDF. This research reveals the mechanism of oil and gas permeation, providing theoretical basis for pipeline design and application.
Article
Multidisciplinary Sciences
Hongfang Lu, Zhao-Dong Xu, Kaihui Song, Y. Frank Cheng, Shaohua Dong, Hongyuan Fang, Haoyan Peng, Yun Fu, Dongmin Xi, Zizhe Han, Xinmeng Jiang, Yao-Rong Dong, Panpan Gai, Zhiwei Shan, Yuli Shan
Summary: Crude oil pipelines are critical to the energy industry, but accidents can have severe public health and environmental impacts, with greenhouse gas emissions, particularly methane, often overlooked. This study provides the first-ever inventory of greenhouse gas emissions resulting from crude oil pipeline accidents in the United States from 1968 to 2020, revealing that gathering pipelines contribute more emissions than transmission pipelines. Texas accounts for over 40% of the total accident-related emissions. The findings enhance the accuracy of greenhouse gas accounting for crude oil transport and support data-driven climate mitigation strategies.
Article
Chemistry, Multidisciplinary
Xiaofang Lv, Jie Zhang, Yi Zhao, Yang Liu, Jiawen Xu, Qianli Ma, Shangfei Song, Shidong Zhou
Summary: Through experimental study on the growth characteristics of NGH in an oil-water emulsion system, it was found that pressure, flow rate, and water cut affect the hydrate induction time, gas consumption, consumption rate, and hydrate volume fraction, obtaining important experimental rules. The induction time decreases with increasing pressure, flow rate, and water cut, while gas consumption and hydrate volume fraction increase with pressure and water cut, and decrease with flow rate.
Article
Chemistry, Physical
Pinqiang Cao
Summary: This study investigated the mechanical properties of amorphous methane hydrates for the first time, proposing an order parameter and a multi-step deformation mechanism core to explain their mechanical characteristics. Through an in-depth analysis of amorphous methane hydrates, the research not only expanded our understanding of their mechanical responses in geological systems but also offered a fresh perspective on structure-property topics of solid materials in future science and technology.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Thermodynamics
Jianfeng Yang, Bo Zhang, Liangchao Chen, Xu Diao, Yuanhao Hu, Guanyu Suo, Ru Li, Qianlin Wang, Jinghai Li, Jianwen Zhang, Zhan Dou
Summary: A semi-empirical radiation model is proposed in this paper to investigate the thermal radiation of tank fires and the thermal response of neighbouring tanks. The model considers smoke generation and its impact on reducing thermal radiation, as well as the variation of flame temperature and emissivity along the flame axis. Compared to existing models, the model accurately predicts the radiant heat flux of the flame, particularly for larger diameter pool fires. The improved model is used to explore the innovative effects of different crude oil contents on the thermal response and failure time of storage tanks under thermal radiation through numerical simulation. An in-depth analysis of the failure time is performed, and an empirical equation is derived as a reference for fire emergency management of large storage tanks.
Article
Environmental Sciences
Frederike Keitel-Groner, Renee K. Bechmann, Frode Engen, Emily Lyng, Ingrid C. Taban, Thierry Baussant
Summary: The study evaluated the effects of ISB residue on Northern shrimp larvae, showing no significant acute or sublethal effects of ISB residue but significant larval mortality in high concentrations of crude oil. This suggests that ISB could mitigate acute impacts of spilled oil on shrimp larvae.
MARINE ENVIRONMENTAL RESEARCH
(2021)
Article
Energy & Fuels
Yulia F. Chirkova, Andrey S. Stoporev, Roman S. Pavelyev, Mikhail A. Varfolomeev
Summary: In recent years, interest in gas hydrates has grown due to their potential as an energy source and environmentally friendly alternative to storing and transporting natural gas. This study compared the effectiveness of sulfonated castor oil (SCO) and sodium dodecyl sulfate (SDS) as promoting reagents in the formation and decomposition of methane and methane-propane hydrates in a porous medium. The results showed that SCO significantly improved the water conversion rate in methane hydrates due to enhanced mass transfer in the presence of surfactants, while the effect on methane-propane hydrates was limited. Both SCO and SDS accelerated hydrate formation, but SCO required less supercooling. These findings suggest that SCO is comparable to SDS in promoting activity in porous media with varying water saturation.
Article
Multidisciplinary Sciences
Yong Chen, Satoshi Takeya, Amadeu K. Sum
Summary: Clathrate hydrates are ordered structures stabilized by hydrophobic interactions between water and guest molecules. In this study, an alternative method is proposed to understand the complex structures of clathrate hydrates, revealing the diverse crystalline hydrogen-bonded networks that can be formed. The topological dual relations between clathrate hydrate networks and tetrahedrally close-packed structures provide insights into their nucleation, phase transition, and co-existence mechanisms. Molecular dynamics simulations are employed to explore the intrinsic structural relationships of clathrate hydrates and other unrelated ordered materials.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Mariia S. Koroleva, Aleksei G. Krasnov, Denis A. Osinkin, Dina G. Kellerman, Andrey S. Stoporev, Irina V. Piir
Summary: This work investigates the structure and properties of synthesized Bi1.6Mg0.8-xCuxNb1.6O7-delta semiconductors and their Li-doped compositions. The preferential location of Cu and Li atoms at certain sites and Mg atoms at others is revealed through various diffraction methods and calculations. The materials exhibit weak antiferromagnetic exchange interactions, high mixed electronic-ionic conductivity, and compatibility with other compounds, suggesting their potential use in composite electrodes for enhanced oxygen conductivity.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Organic
M. V. Reshetina, D. P. Melnikov, A. V. Stavitskaya, V. A. Vinokurov, A. P. Glotov
Summary: Silanized aluminosilicate halloysite nanotubes were used as a support for Pd-Ag catalysts in the selective hydrogenation of acetylene. The catalysts synthesized from [Pd(NH3)4]Cl2 showed the highest selectivity towards ethylene, reaching about 85% at 10-55% acetylene conversion. The samples were characterized by various techniques including low-temperature nitrogen adsorption, ammonia temperature-programmed desorption, and transmission electron microscopy.
PETROLEUM CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Anton P. Semenov, Yinghua Gong, Vladimir I. Medvedev, Andrey S. Stoporev, Vladimir A. Istomin, Vladimir A. Vinokurov, Tianduo Li
Summary: The three-phase equilibrium conditions of vapor-aqueous solution-gas hydrate coexistence for CH4-H2O-organic thermodynamic inhibitor (THI) systems were determined experimentally. Hydrate equilibrium measurements were conducted for systems with methanol (MeOH), monoethylene glycol (MEG), and diethylene glycol (DEG). The temperature and pressure at the point of complete dissociation of methane hydrate were determined through constant-rate heating and vigorous mixing in a high-pressure vessel. The coefficients of empirical equations accurately describe the hydrate equilibrium conditions for the studied systems, taking into account the effect of THI concentration and pressure.
Article
Engineering, Chemical
Anton P. Semenov, Yinghua Gong, Vladimir I. Medvedev, Andrey S. Stoporev, Vladimir A. Istomin, Vladimir A. Vinokurov, Tianduo Li
Summary: Gas hydrate inhibition is an important topic in flow assurance. The hybrid inhibition strategy involving kinetic hydrate inhibitors (KHIs) and thermodynamic hydrate inhibitors (THIs) has been developed through extensive experimental studies. Methane hydrate equilibrium conditions were determined for aqueous solutions of methanol, MEG, and DEG (<50 mass%). The kinetics of methane hydrate nucleation and growth were studied for aqueous solutions of commercial vinyl lactam KHI and its blends with alcohols. A blend of KHI and MEG is optimal for hybrid inhibition, showing enhanced delay of gas uptake and reduced rate of methane hydrate growth.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
U. Zh. Mirzakimov, M. E. Semenov, D. S. Kolotova, A. P. Semenov, A. S. Stoporev
Summary: The study examined the effect of fish gelatin and sodium alginate on the nucleation of methane-propane hydrate. It was found that sodium alginate had no significant impact on hydrate formation, while gelatin showed inhibiting activity. The results also indicated antagonism in the kinetic inhibition of methane-propane hydrate by mixtures of the two polymers. Further investigation is needed to understand the mechanism and develop mixed reagents for hydrate formation control.
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
(2023)
Article
Polymer Science
Andrey Stoporev, Rail Kadyrov, Tatyana Adamova, Evgeny Statsenko, Thanh Hung Nguyen, Murtazali Yarakhmedov, Anton Semenov, Andrey Manakov
Summary: Polymeric models prepared with a 3D printer were used to study methane hydrate formation. Different plastics were tested, and their porosity volumes were analyzed using X-ray tomography. The type of polymer used was found to have a significant impact on enhancing hydrate formation.
Article
Business, Finance
Galyna Nazarova, Alina Demianenko, Iryna Bozhydai, Nikita Nazarov, Kateryna Demchenko, Anton Semenov
Summary: The problem of increasing social security becomes significant in the military and post-war period, especially because individuals in danger lose their health and satisfaction with life and require protection from threats. Modern challenges and sudden shocks have led to a decline in living standards for the population in Ukraine and the world, resulting in a rapid increase in the number of people in need of social protection. The development of a social services market is crucial for effective social protection, and its growth has been substantial in recent years.
FINANCIAL AND CREDIT ACTIVITY-PROBLEMS OF THEORY AND PRACTICE
(2023)
Article
Biochemistry & Molecular Biology
Anton Semenov, Rais Mendgaziev, Andrey Stoporev, Vladimir Istomin, Timur Tulegenov, Murtazali Yarakhmedov, Andrei Novikov, Vladimir Vinokurov
Summary: Using the CO2-H2O system, a new method for determining the non-variant equilibrium of the four phases (vapor-aqueous solution-ice-gas hydrate) in P-T coordinates has been proposed and validated. The method involves direct measurement of parameters after gas hydrate and ice phase formation.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Denis V. Voronin, Eliza Sitmukhanova, Rais I. Mendgaziev, Maria I. Rubtsova, Dmitry Kopitsyn, Kirill A. Cherednichenko, Anton P. Semenov, Rawil Fakhrullin, Dmitry G. Shchukin, Vladimir Vinokurov
Summary: Organic phase-change materials (PCMs) have the potential for developing advanced thermoregulation and responsive energy systems due to their high latent heat capacity and thermal reliability. In this study, organic PCM n-Octadecane was encapsulated into polyurethane capsules, and the effects of different n-Octadecane feedings on shell formation, capsule structure, and latent heat storage properties were investigated. The results showed that the shell thickness decreased and the latent heat storage capacity increased with increasing n-Octadecane feeding.
Article
Multidisciplinary Sciences
Anton P. Semenov, Yinghua Gong, Rais I. Mendgaziev, Andrey S. Stoporev, Vladimir A. Vinokurov, Tianduo Li
Summary: The equilibrium conditions of sII methane/propane hydrates were experimentally determined for the C3H8/CH4-H2O-urea system. The equilibrium dissociation temperatures and pressures of sII hydrates were measured in a wide range. The effect of urea concentration on sII C3H8/CH4 hydrates was analyzed. The phase composition of the samples was analyzed by powder X-ray diffractometry.
Article
Energy & Fuels
M. B. Yarakhmedov, A. G. Kiyamov, M. E. Semenov, A. P. Semenov, A. S. Stoporev
Summary: The study finds that methanol affects the decomposition process of gas hydrates at atmospheric pressure and below 0 degrees C in different ways depending on its saturation with environmental components. Methanol absorption of methane from the hydrate leads to decomposition at lower temperatures, but at a slower rate compared to pure methane hydrate. When methanol is saturated with other medium components, hydrate dissociation occurs at the equilibrium temperature regardless of alcohol concentration. High concentrations of methanol (above 40 mass%) significantly decrease the temperature of hydrate decomposition. The findings suggest that methanol in low dosages (about 10 mass%) can be used for gas storage and transportation without affecting the equilibrium curve of hydrate formation and slowing down the process of methane hydrate decomposition.
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
(2023)
Article
Energy & Fuels
M. B. Yarakhmedov, A. P. Semenov, A. S. Stoporev
Summary: This work shows that water-soluble compounds can either promote or inhibit hydrate formation depending on the thermobaric conditions. Alcohols like methanol, ethanol, and 2-propanol are commonly used as thermodynamic hydrate inhibitors, but this study found that even methanol does not inhibit hydrate formation below the ice crystallization line. Additionally, the presence of ice and liquid mixture accelerates hydrate growth compared to growth from the bulk phase of ice. These findings have implications for developing gas storage and gas mixture separation technologies based on hydrates.
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
(2023)
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)
