Article
Engineering, Environmental
Dong Woo Kang, Wonhyeong Lee, Yun-Ho Ahn, Jae W. Lee
Summary: The study investigated the use of confined tetrahydrofuran (THF) solution in a superabsorbent polymer for developing a reusable gas storage system based on hydrates. It was found that the THF-absorbed SAP could effectively initiate the nucleation and growth of hydrates, maintaining formation behavior over multiple cycles. Despite a slight decrease in methane storage capacity over cycles due to volatile THF loss, a tuning phenomenon occurred leading to a constant storage capacity, confirmed through spectroscopic analysis.
CHEMICAL ENGINEERING JOURNAL
(2021)
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
Hao-Yang Li, Xiao-Sen Li, Yi-Song Yu, Zhao-Yang Chen
Summary: In this study, the morphologies of methane hydrate formation in a system containing different mole ratios of tetrahydrofuran (THF) and cyclopentane (CP) at two different temperatures were systematically studied. The results showed that a hydrate film quickly formed at the interface between CP and the THF solution phase, significantly decreasing gas-liquid mass transfer efficiency. Interestingly, the hydrate layer broke when the temperature increased. Three stages of hydrate formation were observed in the system at the higher temperature. Furthermore, the type of promoters used in the system had no effect on CH4 occupancy in sII cages after the hydrate layer ruptured.
Article
Engineering, Environmental
Yongji Wu, Yurong He, Ming Zhai, Tianqi Tang
Summary: Research shows that using wet activated carbon samples and ice induction can effectively improve the synthesis rate and storage capacity of methane hydrates. By combining certain water content, appropriate particle size of activated carbon, and suitable pressure conditions, methane hydrates with high methane storage capacity can be obtained. This innovative technology is of great significance for the development of solidified natural gas technology.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Man Li, Keyao Li, Lei Yang, Yan Su, Jiafei Zhao, Yongchen Song
Summary: Isotopes are ideal for studying intermolecular interactions in clathrates. By replacing methane with deuterated methane, a strong anharmonic effect was discovered. This effect was also confirmed to exist in methane hydrate, but with lower intensity. This finding provides a tool for characterizing intermolecular behavior in guest-host systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Man Li, Keyao Li, Lei Yang, Yan Su, Jiafei Zhao, Yongchen Song
Summary: Isotopes play an important role in studying intermolecular interactions in clathrates by replacing atoms without destroying the geometry structure, revealing previously unrecognized effects. This study provides a tool for characterizing the guest-host system and can be universally applied to similar isotopic supramolecular compounds.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Energy & Fuels
Mingjun Yang, Feng Li, Bingbing Chen, Jia-nan Zheng, Lanlan Jiang, Yongchen Song
Summary: This study investigated the effects of gas-water volume ratio on THF/CH4 hydrate formation, revealing the different configurations of hydrates under certain conditions. The structure and space utilization rate of hydrates varied significantly under different gas injection modes.
Article
Thermodynamics
Ningru Sun, Ye Zhang, Gaurav Bhattacharjee, Yanjun Li, Nianxiang Qiu, Shiyu Du, Praveen Linga
Summary: Utilizing seawater for synthesizing methane hydrates reduces raw material cost and avoids water scarcity. Experimental results show that increasing temperature decreases the formation rate and methane storage capacity, while increasing pressure enhances these parameters. Structural and morphological analysis reveal the characteristics of synthesized hydrates.
Article
Engineering, Environmental
Liang Yang, Chunxiao Li, Junhua Pei, Xin Wang, Ni Liu, Yingming Xie, Guomin Cui, Daoping Liu
Summary: The use of open-cell copper foam with different pore densities enhances the formation and storage of methane hydrates, improving thermal conductivity and formation rate.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Ye Zhang, Gaurav Bhattacharjee, Mohana Dharshini Vijayakumar, Praveen Linga
Summary: Gas storage technologies are important for energy security and resilience. The use of clathrate hydrates, specifically Solidified Natural Gas (SNG), for natural gas storage is attractive due to its non-explosive nature and high volume density. Recent research has shown that the additive 1,3-dioxolane (DIOX) can improve the thermodynamic and kinetic performance of hydrate formation.
Article
Energy & Fuels
Lanlan Jiang, Zucheng Cheng, Shaohua Li, Nan Xu, Huazheng Xu, Jiafei Zhao, Yu Liu, Minghao Yu, Yongchen Song
Summary: This study systematically investigated the hydrate formation kinetics of CH4-THF under static conditions and found that higher temperature and lower undercooling promoted CH4 storage and hydrate formation. The proportion of CH4 in small cages of sII hydrates increased with temperature. The study also revealed that lowering undercooling and increasing temperature reduced energy consumption during hydrate formation. These findings provide important insights into the storage and transportation of natural gas via the solid hydrate method.
Article
Energy & Fuels
Yingfei Wang, Bo Dong, Ping Wang, Lunxiang Zhang, Cong Chen, Yan Qin, Yang Liu, Weizhong Li, Yongchen Song
Summary: This study develops a model to investigate the effects of initial water on CO2-CH4 dynamic replacement in a hydrate in a pore network, and validates the model with a previous experiment. The results show that the presence of initial water leads to a faster carbon dioxide displacement, weaker methane hydrate dissociation, more pure carbon dioxide hydrate formation, similar mixed hydrate generation, and a lower exchange rate. The exchange reaction starts at the edges of hydrate distribution areas and progresses towards the inside.
Article
Energy & Fuels
Biao Liu, Linsen Zhan, Hailong Lu, Xindi Lu, Wenjiu Cai
Summary: In this study, the formation mechanism of THF hydrate was investigated using low-field NMR. A quantitative relationship between NMR T-2 and the mass of THF hydrate was established. The results showed that T-2 of THF solution was controlled by temperature and THF concentration, and the formation of THF hydrate was influenced by temperature and THF concentration.
Article
Engineering, Environmental
Jun Chen, Jianjian Wu, Yaosong Zeng, Zhikai Liang, Guangjin Chen, Bei Liu, Zhi Li, Bin Deng
Summary: The self-preservation effect of methane hydrate was improved by introducing deuterium oxides (D2O) as host molecules, leading to an increase in stability.
CHEMICAL ENGINEERING JOURNAL
(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)
Article
Engineering, Chemical
Praveen Linga
Summary: This article presents a bibliometric analysis of the field of gas hydrates or clathrate hydrates from 1901 to 2020. The analysis includes the top countries, cited review articles, original research articles, source titles, field classifications, citation rate trends, and co-occurrence of keywords. Network visualization maps were created to analyze the citations and identify the relationships between countries, sources, and organizations.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Lagnajita Paul, Namrata Gaikwad, Rajnish Kumar
Summary: Hydrate-based desalination is a promising and environmentally friendly technique for producing fresh water from saline water. This research investigated the kinetics of hydrate formation in saline water and compared the utility of CO2 and N-2 as hydrate formers for desalination work.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Hyunho Kim, Junjie Zheng, Zhenyuan Yin, Ponnivalavan Babu, Sreekala Kumar, Jackson Tee, Praveen Linga
Summary: The rheology of TBAB semi-clathrate hydrate slurry (SHS) was studied, and the discrepancy in the literature was clarified. TBAB SHS exhibited non-Newtonian shear-thinning behavior, with its apparent viscosity increasing exponentially with the increase of hydrate fraction. Type B TBAB SHS was recommended due to its lower apparent viscosity. Additionally, the environmentally benign additive L-tryptophan was found to significantly decrease the apparent viscosity of TBAB SHS and reduce pumping power consumption in cooling applications by 68.7%.
Article
Chemistry, Multidisciplinary
Kavya Mrudula Tadepalli, Suman Chakrabarty, Pramod Patil, Rajnish Kumar
Summary: Oligomers of PDMS (M1), polyFast (M2), modified PVEE (M3 and M4), and two new molecules with cyclic cores (M5 and M6) were studied for their ability to thicken sc-CO2 without a cosolvent at 377 K and 55 MPa. PDMS and polyFast behaved as expected, with PDMS not improving viscosity and polyFast significantly enhancing it. M3 and M4 did not significantly improve viscosity even with the introduction of a styrene component, but solubility in the fluid was improved. M5 and M6, however, showed enhanced viscosity similar to polyFast due to their structural advantage and pi-pi interactions. The synthesis of these molecules was found to be moderately easy.
Article
Chemistry, Multidisciplinary
Viphada Yodpetch, Katipot Inkong, Hari Prakash Veluswamy, Santi Kulprathipanja, Pramoch Rangsunvigit, Praveen Linga
Summary: Carbon capture and storage (CCS) is a promising method for reducing carbon dioxide (CO2) emissions from fossil fuels. Amino acids, such as leucine, methionine, and valine, were used as promoters in CO2 hydrate formation. Different concentrations of amino acids had varying effects on the rate of hydrate formation. The use of amino acids with the hybrid combinatorial reactor (HCR) approach shows promise for CCS applications.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Review
Energy & Fuels
Gourav Kumar Rath, Gaurav Pandey, Sakshi Singh, Nadezhda Molokitina, Asheesh Kumar, Sanket Joshi, Geetanjali Chauhan
Summary: Carbon dioxide (CO2) emissions from burning fossil fuels are crucial for global warming/climate change. The review focuses on CO2 capture, utilization, and sequestration, and highlights the challenges faced in deploying these technologies. It also discusses recent advances in gas separation technologies and future directives for commercial deployment.
Article
Chemistry, Physical
Gaurav Vishwakarma, Bijesh K. Malla, K. S. S. V. Prasad Reddy, Jyotirmoy Ghosh, Soham Chowdhury, Sharma S. R. K. C. Yamijala, Sandeep K. Reddy, Rajnish Kumar, Thalappil Pradeep
Summary: Restricted migration of CO2 from clathrate hydrate cages to amorphous solid water matrix was observed in the presence of tetrahydrofuran (THF) under ultrahigh vacuum and cryogenic conditions. This cage-matrix exchange may create a more conducive environment for chemical transformations in interstellar environments.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Chemical
Namrata Gaikwad, Hyunho Kim, Gaurav Bhattacharjee, Jitendra S. Sangwai, Rajnish Kumar, Praveen Linga
Summary: This study experimentally investigated the formation of sH hydrate with methane and cyclooctane for possible applications in gas storage. The study found that the slow kinetics of sH hydrate formation can be improved by using low tryptophan concentrations. Raman analysis confirmed the presence of methane and cyclooctane in the sH hydrate cages.
ACS ENGINEERING AU
(2023)
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
Prahlad Gurjar, Sadhbhawana Dubey, Sanat Kumar, Asheesh Kumar
Summary: This study evaluates the formation kinetics and storage capacity of CO2 hydrates in clayey-sandy sediments and develops a chemical potential-based kinetic model. The research provides important insights for the deployment of HBCS technology in subsea clayey-sandy sediments in the Krishna-Godavari Basin of India.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Aleksandr Andreevich Kibkalo, Gaurav Pandey, Klavdia Andreevna Pletneva, Nadezhda Sergeevna Molokitina, Asheesh Kumar, Polina Zhingel, Boris Vladimirovih Grigoriev
Summary: This study evaluates the promotional/inhibition effect of environmentally friendly biodegradable, water-soluble polymers for methane hydrate formation. The results show a direct correlation between the melting rate of frozen powdered biopolymers and the transition rate of water to hydrate. The findings classify the best biopolymers to enhance the kinetics of hydrate formation and highlight the promise of using biopolymers for solidified natural gas technology.
Article
Engineering, Environmental
Rahul Sarkhel, Chandan Sahu, Rajnish Kumar, Jitendra S. Sangwai
Summary: This study investigates the kinetics of CO2 hydrate formation and dissociation in the presence of CO2-philic additives. The results show that the additives, particularly DDP at a concentration of 0.5 wt%, significantly enhance the formation and dissolution rates of CO2 hydrates.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Gaurav Vishwakarma, Bijesh K. Malla, K. S. S. V. Prasad Reddy, Jyotirmoy Ghosh, Soham Chowdhury, Sharma S. R. K. C. Yamijala, Sandeep K. Reddy, Rajnish Kumar, Thalappil Pradeep
Summary: Restricted migration limits chemical transformations within interstellar and cometary ices. We found that CO2 can migrate from clathrate hydrate cages to amorphous solid water in the presence of tetrahydrofuran under ultrahigh vacuum and cryogenic conditions. This migration may create a more conducive environment for chemical transformations in interstellar environments.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Environmental
Yan Li, Zhenyuan Yin, Hongfeng Lu, Chenlu Xu, Xuejian Liu, Hailin Huang, Daoyi Chen, Praveen Linga
Summary: Carbon capture and sequestration (CCS) is widely recognized as the most effective technology for reducing CO2 emissions and mitigating global climate change. Hydrate-based CO2 sequestration (HBCS) has emerged as a promising technology, and there is growing interest in using hydrophobic amino acids to enhance CO2 hydrate formation kinetics.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
