Article
Energy & Fuels
Zhimin Wu, Yi-Song Yu, Shidong Zhou, Chengyuan He, Hui Du
Summary: This study systematically investigates the flow characteristics of CO2 hydrate slurry by analyzing its rheological behavior, apparent viscosity, and crystal shape. The results show that the addition of Tween-80 can effectively prevent blockage and promote the formation of pseudoplastic hydrate slurry. In contrast, the pure water system is prone to blockage and forms dilatant hydrate slurry.
Article
Energy & Fuels
Vikas Dhamu, M. Fahed Qureshi, Saifudin Abubakar, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: Carbon capture and storage [CCS] is essential for reducing CO2 emissions, and one potential CCS concept is compressing and storing captured CO2 as gas hydrates in deep oceanic sediments. However, the high salinity of seawater may affect the formation and storage of CO2 hydrates. Therefore, it is crucial to understand the kinetics of liquid CO2 hydrate formation and dissociation in static brine systems.
Article
Energy & Fuels
Vyacheslav G. Smirnov, Andrey Y. Manakov, Zinfer R. Ismagilov
Summary: A new equation describing the equilibrium conditions for gas hydrate in thin pores of mesoporous materials is proposed in this study. The equation takes into account the size of hydrate particles together with the chemical potential of pore water in equilibrium with the hydrate. The modeling results are in reasonable qualitative agreement with the experimental data.
Article
Energy & Fuels
M. Fahed Qureshi, Vikas Dhamu, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: Carbon capture and sequestration is a critical method to reduce carbon footprint and achieve net-zero carbon emissions. This study examines the kinetics of CO2 hydrate formation using liquid CO2 and a green kinetic promoter, and presents a mathematical model for quantifying hydrate formation kinetics. The results show that the green kinetic promoter enhances the overall water to hydrate conversion and reduces the formation process time.
Article
Engineering, Environmental
Yu-Hsuan Ho, Yau Zu Khoo, Yan-Ping Chen, Ryo Ohmura, Li-Jen Chen
Summary: This study investigates the thermodynamic and kinetic influence of polyethylenimine (PEI) on the formation of methane and carbon dioxide hydrates. It is found that PEI acts as a thermodynamic inhibitor, inhibiting the formation of hydrates. However, it has different effects on methane and carbon dioxide hydrates kinetically, inhibiting methane hydrate formation and promoting carbon dioxide hydrate formation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Lanyun Wang, Yu Chen, Yongliang Xu, Yajuan Zhang, Yao Li, Yan Wang, Jianping Wei, Tingxiang Chu
Summary: The effects of ionic liquids (ILs) on CO2 hydrates were studied, and it was found that all five ILs could increase CO2 consumption and enhance water to hydrate conversion. [P2 4 4 4][PF6] and [P6 4 4 4][PF6] promoted CO2 hydrate nucleation, resulting in a slightly higher temperature for phase equilibrium and reduced induction times. On the other hand, [N2 2 2 2]Br, [N2 2 2 2][NTf2], and [N2 2 2 2][PF6] slowed down CO2 hydrate nucleation, leading to a lower temperature for phase equilibrium and prolonged induction times.
Article
Thermodynamics
Saeid Sinehbaghizadeh, Agus Saptoro, Sepideh Amjad-Iranagh, Amir H. Mohammadi
Summary: This study investigates the influence of different biogas compositions on clathrate hydrate formation and proposes a kinetic model for predicting the progress of biogas crystal growth. The results indicate that the concentration of dissolved gas in liquid water is a key factor in the growth rate, with H2S and SO2 molecules slightly promoting biogas hydrate formation and N2 and H2 molecules reducing the generation rate of biogas hydrate.
Article
Energy & Fuels
Rui Tan, Pengchao Wang, Yan He
Summary: In this study, a new horizontal biaxial stirring instrument was used to prepare cyclopentane hydrate, and computational fluid dynamics (CFD) numerical simulation was used to study the flow, pressure, and velocity fields. The results showed that the complex secondary flow promoted the mixing of cyclopentane and water, reduced the dead zone area, and decreased the risk of adherent growth of hydrate.
Article
Engineering, Chemical
Zengqi Liu, Shuting Zhang, Yingying Liu, Qiang Sun, Zhen Xu, Aixian Liu, Yiwei Wang, Xuqiang Guo
Summary: This study evaluated the Peq of CH4-CO2 gas mixtures with different TBAB solutions at different temperatures by considering the effects of multiple solute interactions and the deformation of D-cages. The proposed model can accurately predict Peq by incorporating the effects of gas dissolution, the presence of electrolytes, and the deformation of D-cages. It provides a quantitative description of these effects on Peq values for corresponding systems.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Anton P. Semenov, Rais Mendgaziev, Andrey S. Stoporev, Vladimir A. Istomin, Daria Sergeeva, Timur B. Tulegenov, Vladimir A. Vinokurov
Summary: This paper investigates the potential of dimethyl sulfoxide (DMSO) as an inhibitor of gas hydrates. Equilibrium conditions of CO2 hydrates were measured at different temperatures and DMSO concentrations, revealing that DMSO reduces the thermodynamic stability of CO2 hydrate and exhibits stronger inhibition activity in water solution compared to lower alcohols. The study also demonstrates the thermodynamic coherence of the new hydrate equilibrium data and identifies the presence of sI hydrate, crystalline ice Ih, and solid CO2 phases. Overall, DMSO can be considered an effective thermodynamic inhibitor for CO2 hydrate formation, surpassing the activity of alcohol THIs within a specific range.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Qin-Kun Li, Alex Kutana, Evgeni S. Penev, Boris Yakobson
Summary: This study reveals the reaction mechanisms of metal corrosion in supercritical CO2 through ab initio molecular dynamics and enhanced sampling methods. It is found that the iron surface plays a catalytic role in activating inert CO2 and facilitating the formation of reactive species. The hydrogen bond network of water molecules assists in the reactions between H atoms and CO2. This atomistic insight can provide possible remedies for corrosion prevention.
Article
Energy & Fuels
Junwen Bai, Jintong Gu, Dongjun Wang, Liyan Shang, Zhenbo Lv, Jiaqi Zhai
Summary: This study examines the kinetic effects of low concentrations of ethylene glycol (EG) and sodium chloride (NaCl) on methane hydrate production in sodium dodecyl sulfate (SDS) solution. The results show that both NaCl and EG have inhibitory effects on hydrate reaction in SDS solution, with the inhibitory effects increasing with concentration. Understanding the formation characteristics of hydrates is useful for industrial optimization and predicting additive concentrations in pipelines.
Article
Energy & Fuels
Qi Zhao, Zhi-Ming Xia, Chun-Gang Xu, Zhao-Yang Chen, Xiao-Sen Li
Summary: This study investigated the nucleation and growth of CO2 hydrate under the application of different voltages, revealing the impact of physical bubble behavior and electrochemistry mechanisms on the formation process. The results showed a significant decrease in induction time and semi-completion time with the presence of 15V, while high voltage (60V) inhibited the formation process and changed the morphology characteristics of CO2 hydrate.
FRONTIERS IN ENERGY RESEARCH
(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
Thermodynamics
Zhongjin He, Fengyi Mi, Fulong Ning
Summary: Microsecond molecular simulations were conducted to investigate the impact of surface properties on CO2 hydrate formation in slit-nanopores of graphite and hydroxylated-silica surfaces. The results showed that different surface properties affect hydrate formation primarily by altering the aqueous CO2 concentration. Hydrophobic graphite surfaces adsorbed CO2 molecules strongly, reducing the aqueous CO2 concentration, while hydrophilic silica surfaces led to high aqueous CO2 concentration due to the adsorption of CO2 nanobubbles.
Article
Thermodynamics
Rod Burgass, Antonin Chapoy, Valderio de Oliveira Cavalcanti Filho
Summary: The water content of gas is critical in various fields and accurate measurements are needed to prevent condensation issues. This paper introduces a new method for accurate dew/frost point measurements that can be used in both laboratory and field applications over a wide range of pressures.
FLUID PHASE EQUILIBRIA
(2021)
Article
Energy & Fuels
Prashant Jadhawar, Jinhai Yang, Antonin Chapoy, Bahman Tohidi
Summary: This study investigates CO2 sequestration and storage into methane (CH4) hydrate sediments, examining the replacement of CH4 by CO2 in hydrates under varying thermodynamic conditions at both the macroscale and microscale levels. The results show high CH4 gas recovery within HSZ-II, while higher water saturation conditions diminish this recovery. In addition, significant CH4 production is obtained deep inside HSZ-I with the application of inhibitors. Our novel microscale micromodel evaluations reveal the release of CH4 gas through convection, slow CO2 diffusive mass transfer, and CO2-CH4 replacement within HSZ-I.
Article
Environmental Sciences
P. Thoutam, S. Rezaei Gomari, A. Chapoy, F. Ahmad, M. Islam, I. Ahmed
Summary: This study found that adding TIPA and THF can improve the selectivity of CO2 separation during hydrate formation and reduce the operational pressure. Under different experimental conditions, TEA is not conducive to hydrate formation, while the addition of TIPA helps to increase the capture efficiency of CO2.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Morteza Aminnaji, Ross Anderson, Bahman Tohidi
Summary: Traditional assumptions about gas hydrate structures in natural gas systems have been challenged by experimental studies on propane, binary methane-propane, and ternary methane-ethane-propane hydrate systems. The research found that different gas mixtures can form multiple hydrate phases sequentially, with gas fractionation driving the formation of these structures. The results suggest that gas fractionation plays a significant role in the phase behavior of hydrates and highlights the need for caution when applying isochoric methods to multicomponent gas systems.
Article
Engineering, Chemical
Esther Neyrolles, Alain Valtz, Christophe Coquelet, Antonin Chapoy
Summary: This paper investigates the VaporLiquid-Equilibrium of a binary system composed of CO2 and N2O4/NO2. Experimental data on the bubble points at different temperatures and pressures were obtained, and the Peng-Robinson equation of state was used to represent the data.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Energy & Fuels
Morteza Aminnaji, Ross Anderson, Khosro Jarrahian, Bahman Tohidi
Summary: Low dosage kinetic hydrate inhibitors (KHIs) are an effective method for preventing solid gas hydrate plug formation in the oil and gas industry. Efforts have been made to develop environmentally friendly KHIs due to concerns around the non-biodegradability of traditional chemistries. Natural pectin has been identified as a potential green KHI with good hydrate inhibition properties. This study compared the performance of food grade apple pectin and the commercial biodegradable KHI polymer Luvicap Bio using crystal growth inhibition methods. Results show that Luvicap Bio offers significant inhibition to high subcoolings, while pectin only shows some anti-nucleation properties.
Article
Energy & Fuels
Abdulla Alassi, Rod Burgass, Antonin Chapoy
Summary: This study investigated the water content of liquid propane in equilibrium with liquid water or hydrates at different pressure and temperature conditions. Three different methods were used for measurement and thermodynamic models were developed. The results showed good agreement between the new method and QCM measurements. Different models were used for fluid phase behavior simulation and similar results were obtained.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Pezhman Ahmadi, Antonin Chapoy, Rod Burgass
Summary: A vibrating tube density meter (VTD) was used to measure the density of pure glycerol at different temperatures and pressures. The speed of sound in glycerol was also measured using an acoustic cell. The measured data were used to calculate various thermophysical properties and were found to be in good agreement with literature data.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2023)
Article
Thermodynamics
Abdulla Alassi, Antonin Chapoy, Rod Burgass
Summary: In this study, the minimum water content required for hydrate formation in ethane was determined using the sCPA-SRK equation of state, classical mixing rules, and solid solution theory. The model achieved an average deviation of 9.25% compared to measurements and literature data. A novel method was used to obtain new water content measurements in liquid ethane, with an average deviation of 4.61%. The model was also successful in predicting ethane solubility and hydrate dissociation points.
FLUID PHASE EQUILIBRIA
(2023)
Article
Thermodynamics
Rod Burgass, Antonin Chapoy
Summary: This paper presents experimental equipment, methods and new results for the water content of carbon dioxide and impure carbon dioxide in equilibrium with hydrates. The experimental data are compared with predictions from two thermodynamic models, showing that the hydrate-forming conditions are modelled by the solid solution theory of van der Waals and Platteeuw.
FLUID PHASE EQUILIBRIA
(2023)
Article
Energy & Fuels
Morteza Aminnaji, Ross Anderson, Alfred Hase, Bahman Tohidi
Summary: Low dosage kinetic hydrate inhibitors (KHIs) are promising for inhibiting hydrate formation at its early stages, showing both nucleation inhibition and crystal growth inhibition properties. This study evaluates the ability of PVCap polymer to inhibit pre-formed hydrates in a methane-water system. Results indicate that KHIs can not only inhibit further growth but also induce partial to complete dissociation of pre-formed hydrates, even inside the hydrate region, under certain conditions. This behavior is speculated to be related to the transition from metastable to stable hydrate structures.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Physical
Mehrdad Vasheghani Farahani, Aliakbar Hassanpouryouzband, Jinhai Yang, Bahman Tohidi
Summary: A coupled geophysical-geothermal scheme is developed for predicting hydrate saturation in gas hydrate-bearing permafrost sediments, incorporating geophysical and geothermal responses. The scheme shows promising results in quantifying the saturation of co-existing phases with acceptable accuracy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mehrdad Vasheghani Farahani, Aliakbar Hassanpouryouzband, Jinhai Yang, Bahman Tohidi
Summary: This study investigates the evolution of gas hydrate-bearing permafrost sediments against environmental temperature change. Experimental results reveal the influence of complex pore-scale factors on elastic wave velocities and effective thermal conductivity (ETC). The research emphasizes the importance of distinguishing between ice and gas hydrates in frozen sediments for accurate quantification of natural gas hydrate as a sustainable energy resource.
Article
Chemistry, Physical
Mehrdad Vasheghani Farahani, Xianwei Guo, Lunxiang Zhang, Mingzhao Yang, Aliakbar Hassanpouryouzband, Jiafei Zhao, Jinhai Yang, Yongchen Song, Bahman Tohidi
Summary: A study using magnetic resonance imaging was conducted to explore the kinetics and spatial characteristics of thermally induced methane hydrate formation in synthetic and natural sediment samples. The results showed that the first cycle of formation/dissociation had an impact on subsequent cycles, with differences observed in the behavior of natural and synthetic sediment samples during cyclic hydrate formation/dissociation.
SUSTAINABLE ENERGY & FUELS
(2021)