Article
Chemistry, Physical
Arezoo Azimi, Jafar Javanmardi, Amir H. Mohammadi
Summary: A thermodynamic model based on the dissociation enthalpy of clathrate hydrate and water activity in porous medium is introduced to predict the stability conditions of clathrate hydrates. The model is capable of predicting the dissociation conditions of simple and mixed-clathrate hydrates in various porous media and under a wide range of operating conditions, confirming that the inhibition effect of porous medium increases as pore diameter decreases.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Khayyam Mehrabi, Jafar Javanmardi, Ali Rasoolzadeh, Amir H. Mohammadi
Summary: This study experimentally measured the dissociation conditions of methane hydrates in the presence of diethanolamine (DEA) and diethanolamine + ethylene glycol (EG) aqueous solutions. It was found that DEA thermodynamically inhibits methane hydrate formation, shifting stability temperatures by about 4.2 K. Although DEA is weaker than EG, it can still be used as a gas sweetening agent and hydrate inhibitor.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Simin Keshtkari, Abdolmohammad Alamdari, Amir H. Mohammadi
Summary: Accurate modeling of clathrate hydrates phase behaviors is crucial for the petroleum industry. This study investigates the influence of repulsive force between guest-host molecules in hydrate cavities and compares the performances of different potential functions. The results show promising improvement in binary hydrate systems.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Thermodynamics
Hassan Pahlavanzadeh, Sepideh Nouri, Mahnaz Aghajanloo, Amir H. Mohammadi, Samira Mohammadi
Summary: In this study, the dissociation conditions of CO2 + water systems in the absence/presence of MgCl2 + THF aqueous solutions at different concentrations were investigated experimentally and thermodynamically. The results showed that MgCl2 acted as an inhibitor while THF acted as a promoter. The equilibrium curve shifted towards the left in the presence of MgCl2, especially at high pressures. A thermodynamic model using the Peng-Robinson equation of state and the UNIQUAC activity coefficient model was developed and found to predict the equilibrium conditions reasonably well.
FLUID PHASE EQUILIBRIA
(2023)
Article
Chemistry, Physical
Zhangyang Kang, Maogang He, Guangxuan Lu
Summary: In this study, the phase diagram of the NaCl+RbCl binary system was measured using differential scanning calorimetry and a thermodynamic model was developed to calculate phase equilibria and other thermodynamic data. The calculated results were able to reproduce experimental data well and demonstrate thermodynamic self-consistency.
Article
Engineering, Chemical
Hideki Tanaka, Takuma Yagasaki, Masakazu Matsumoto
Summary: An elaborated statistical mechanical theory is applied to explore the phase equilibria and dissociation enthalpies of clathrate hydrates, accurately recovering experimental data and showing sensitivity of phase diagram boundaries to the size of guest molecules. The study separately calculates enthalpy contributions from host and guest interactions, enabling evaluation of dissociation enthalpy at stable and metastable thermodynamic states considering phase transitions.
Article
Thermodynamics
Jin Shimada, Moe Yamada, Atsushi Tani, Takeshi Sugahara, Katsuhiko Tsunashima, Yusuke Tsuchida, Takayuki Hirai
Summary: The thermodynamic properties of SCHs are influenced by the steric conformations of the guest anions. Different guest anions have varying effects on the equilibrium temperatures of SCHs, with some exhibiting similar temperatures while others show higher temperatures. Anion size and conformation play a critical role in determining the stability and properties of SCHs.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2022)
Article
Chemistry, Multidisciplinary
Elodie Gloesener, Mathieu Choukroun, Tuan H. Vu, Helen E. Maynard-Casely, Arnaud Desmedt, Ashley Gerard Davies, Christophe Sotin
Summary: Methane clathrate hydrates and their analogues, tetrahydrofuran (THF) and cyclopentane, can partially dissociate at temperatures as low as 200 K in the presence of ammonia (NH3). This behavior has important implications for the hydrocarbon cycle on Titan and the replenishment of atmospheric methane. The study characterizes the effect of ammonia on clathrates and the various phases formed in the H2O-THF-NH3 system, confirming the partial dissociation of THF clathrates and discovering a previously unknown THF-NH3-rich phase. The findings suggest that the presence of ammonia could trigger the melting of methane clathrates in Titan's icy shell.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Energy & Fuels
Jiwoong Seol
Summary: In this study, novel CH4 hydrates containing nitroalkanes were synthesized and investigated. The results showed that nitroalkanes can significantly decrease the CH4 storage pressures and the hydrates have high energy density and potential for energy-efficient CH4 storage and transport technologies.
Article
Energy & Fuels
Olga Gaidukova, Sergei Misyura, Pavel Strizhak
Summary: Gas hydrates have high energy density and are considered a promising clean energy source. However, there is a lack of research in areas such as sediments' effect on hydrate saturation, mathematical models for hydrate dissociation, and technology renewal for easier and cheaper gas hydrate production. Models for gas hydrate ignition need to consider dissociation processes and self-preservation effects.
Article
Thermodynamics
Khashayar Nasrifar, Jafar Javanmardi, Ali Rasoolzadeh, Amin Shoushtari
Summary: This work investigates the equilibrium hydrate disappearance conditions of methane + propane/water and successfully replicates the natural gas/water system. The experiments confirm that the presence of propane significantly promotes the disappearance of methane hydrate. Additionally, a statistical model is used to predict the experimental data accurately.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2022)
Article
Chemistry, Physical
Asheesh Kumar, Hari Prakash Veluswamy, Sanat Kumar, Rajnish Kumar, Praveen Linga
Summary: Clathrate hydrate-based sustainable technologies, such as solidified natural gas (SNG) technology, show great potential for storing natural gas. Experiments on mixed hydrates in a seawater environment reveal the promotional effect of seawater on hydrate formation and suggest the economic feasibility of using natural seawater to enhance SNG technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Review
Chemistry, Multidisciplinary
Jyotirmoy Ghosh, Gaurav Vishwakarma, Rajnish Kumar, Thalappil Pradeep
Summary: Through multiple studies in a simulated interstellar environment, we have discovered several molecules' clathrate hydrates (CHs). These CHs play an important role in the chemical processes of the interstellar medium, contributing to the chemical evolution and formation of planetary systems as well as the origin of life.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Engineering, Environmental
Youngki Lee, Hyeonjin Kim, Wonhyeong Lee, Dong Woo Kang, Jae W. Lee, Yun-Ho Ahn
Summary: This review explores the potential of clathrate hydrates as a technology for CO2 capture and separation, showcasing methods to improve CO2 hydrate formation and separate CO2 from gas mixtures. It also delves into additional applications such as cold energy storage and the advantages of the CH4-CO2 replacement method.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Bongliba T. Sangtam, Subrata Kumar Majumder
Summary: New empirical correlations for organic and inorganic gas hydrates in pure water and thermodynamic inhibitors have been developed in this study, showing good agreement with experimental data and providing important predictions for natural gas production.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Saeideh Babaee, Hamed Hashemi, Amir H. Mohammadi, Paramespri Naidoo, Deresh Ramjugernath
CHEMICAL ENGINEERING COMMUNICATIONS
(2020)
Article
Thermodynamics
Onellan Govender, Juergen Rarey, Deresh Ramjugernath
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2020)
Article
Engineering, Electrical & Electronic
Magdi E. Gibril, Prabashni Lekha, Jerome Andrew, Bruce Sithole, Deresh Ramjugernath, Ajit Khosla
Summary: An organic-inorganic functionalized nano-filler (CNC-TiO2) was prepared by loading titanium dioxide nanoparticles onto the crystalline nanocellulose surface to enhance compatibility with the matrix (PMMA). Nanocomposite films (PMMA/CNC-TiO2) were successfully prepared and characterized using various techniques. The addition of the nanofiller significantly improved the mechanical and thermal properties of PMMA, and the nanocomposite films showed UV-blocking properties.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2022)
Article
Thermodynamics
Kuveneshan Moodley, Mishqah Hussain, Paramespri Naidoo, Theasha Naidoo
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2020)
Article
Thermodynamics
Marcin Durski, Paramespri Naidoo, Deresh Ramjugernath, Urszula Domanska
FLUID PHASE EQUILIBRIA
(2020)
Article
Engineering, Chemical
Parisa Doubra, Paramespri Naidoo, Wayne Michael Nelson, Deresh Ramjugernath
Article
Engineering, Chemical
Mark D. Williams-Wynn, Paramespri Naidoo, Deresh Ramjugernath
MINERALS ENGINEERING
(2020)
Article
Thermodynamics
Thavashni Chetty, Paramespri Naidoo, Kuveneshan Moodley
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2020)
Article
Thermodynamics
Tauheeda Fakir, Saeideh Babaee, Paramespri Naidoo
Summary: The study showed that as the initial pressure increased at constant temperature, the induction time decreased, while the rate of CO2 hydrate formation, apparent rate constant, storage capacity, and water-to-hydrate conversion increased. Similar trends were observed when the initial temperatures were decreased. Lower stirrer speeds resulted in longer induction times and formation rates.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Thermodynamics
Mojgan Ebrahiminejadhasanabadi, Wayne Michael Nelson, Paramespri Naidoo, Amir H. Mohammadi, Deresh Ramjugernath
Summary: The study investigated the use of new hybrid amine solvents for carbon dioxide capture in comparison to traditional amine technology. It found that hybrid solvents could have better performance in certain conditions and that the addition of an ionic liquid could modify the properties of the solvent.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Thermodynamics
Saeideh Babaee, Hamed Hashemi, Paramespri Naidoo, Deresh Ramjugernath
Summary: In this study, the gas hydrate method was used to separate expensive gas mixtures such as xenon and argon, with experimental results showing successful purification of xenon from a mixture with argon in a single gas hydrate formation stage. The model predictions based on thermodynamic principles were in good agreement with the experimental data.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Thermodynamics
Mojgan Ebrahiminejadhasanabadi, Wayne Michael Nelson, Paramespri Naidoo
Summary: In this study, the solubility of methane and ethane in n-methyl-2-pyrrolidone and monoethanolamine-based solvents was determined. The results showed that replacing the aqueous part of monoethanolamine solvents with n-methyl-2-pyrrolidone increased the solubility of desirable components of natural gas. Adding monoethanolamine to n-methyl-2-pyrrolidone outperformed the Purisol solvent in terms of carbon dioxide absorption and decreased hydrocarbon solubility.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2023)
Article
Thermodynamics
Reddicherla Umapathi, C. Narasimha Rao, Paramespri Naidoo, Indra Bahadur, Deresh Ramjugernath, Pannuru Venkatesu
JOURNAL OF CHEMICAL THERMODYNAMICS
(2020)