Article
Energy & Fuels
Sotirios Nik Longinos, Mahmut Parlaktuna
Summary: The study showed that radial flow experiments exhibited better behavior in hydrate formation for the methane-propane mixture, while lysine acted as a promoter for hydrate formation. RT experiments consumed more energy compared to PBT ones, with shorter induction times.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Energy & Fuels
Shamil E. Gainullin, Abdolreza Farhadian, Polina Y. Kazakova, Matvei E. Semenov, Yulia F. Chirkova, Atousa Heydari, Roman S. Pavelyev, Mikhail A. Varfolomeev
Summary: Novel amino acid derivatives (ACDs) were developed as efficient promoters for methane hydrate formation and recovery, exhibiting superior kinetics compared to anionic surfactants without foaming. ACD5 achieved the highest promotion effect in distilled water, increasing the water-to-hydrate conversion from 39.6% to 94.3%, exceeding sodium dodecyl sulfate (SDS). ACDs also showed higher promotion activity than SDS in salt water, making seawater a cost-effective alternative for methane hydrate production.
Article
Engineering, Environmental
Jyoti Shanker Pandey, Jesper Lundtoft Hansen, Nicolas von Solms
Summary: This study investigates the effects of different types of promoters on the adsorption capacity of hydrogen-rich natural gas hydrates and suggests that promoter selection should be based on the hydrogen gas mol% in the mixture. The results reveal that kinetic promoters are effective at low hydrogen concentrations, while thermodynamic promoters are effective at high hydrogen concentrations. Furthermore, the study emphasizes the influence of the CH4/C2H6 mixture on formation kinetics and crystal structure, and the impact of hydrogen mol% on H-2 cage occupancy.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Wonhyeong Lee, Dong Woo Kang, Yun-Ho Ahn, Jae W. Lee
Summary: This study introduces a hydrate seed solution for the rapid formation of hydrogen-enriched hydrocarbon mixed hydrates, showing that the type of hydrate seed solution used can significantly impact the growth and structure of the resulting gas hydrates. THF hydrate seed provides a higher storage ratio of hydrogen compared to CP hydrate seed, indicating potential for enhanced formation of hydrogen-natural gas clathrates for sustainable energy gas storage.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
Article
Chemistry, Multidisciplinary
Sotirios Nik Longinos, Mahmut Parlaktuna
Summary: The study found that under different impeller and baffle combinations, RT experiments performed better in terms of hydrate formation rate, while PBTU experiments showed higher hydrate productivity. In general, RT experiments consumed more energy compared to PBTU experiments.
Article
Green & Sustainable Science & Technology
Hongsheng Dong, Jiaqi Wang, Zhuoxue Xie, Bin Wang, Lunxiang Zhang, Quan Shi
Summary: This review discusses the potential applications of gas hydrates in energy and environmental fields, highlighting their advantages in gas storage, gas separation, wastewater treatment, and other areas. Challenges, limitations, and future directions for each application are also explored in the paper.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
Sotirios Nik Longinos, Mahmut Parlaktuna
Summary: This study investigates the effects of types and number of impellers and baffles on hydrate formation, showing that although rushton turbine (RT) experiments consume more energy, they have higher rates and yield of hydrate formation compared to pitched blade turbines upward pumping (PBTU) experiments.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Biochemistry & Molecular Biology
Sotirios Nik. Longinos, Dionisia Dimitra Longinou, Nurbala Myrzakhmetova, Nazgul Akimbayeva, Mariamkul Zhursumbaeva, Kaldibek Abdiyev, Zhexenbek Toktarbay, Mahmut Parlaktuna
Summary: The research focuses on the heat generation during gas hydrate formation and presents a new impeller design to overcome this issue. The experiments show that using specific baffles and impeller types can enhance the rate of hydrate formation.
Article
Energy & Fuels
K. P. Lijith, Reddi Srinivasa Rao, Devendra Narain Singh
Summary: This study investigates the synthesis of CO2 hydrates in partially saturated finesands under triaxial conditions and analyzes their elastic properties and formation and dissociation processes. The results show that the induction time for CO2 hydrate formation increases and the water-to-hydrate conversion ratio decreases with an increase in the initial water content.
Article
Engineering, Chemical
Zhixia Deng, Shuanshi Fan, Yanhong Wang, Xuemei Lang, Gang Li
Summary: The addition of stainless steel fiber in the solution for gas storage in hydrates improves the heat removal issue during hydration process, enhances gas storage speed and capacity by increasing nucleation sites. Longer stainless steel fibers show higher gas storage capacity and methane uptake rate compared to shorter fibers. Stainless steel fiber combined with sodium dodecyl sulfate demonstrates excellent gas storage performance with reduced usage amount and increased volume gas storage density.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Thermodynamics
Chen Chen, Haoyu Yuan, Rongshan Bi, Na Wang, Yujiao Li, Yan He, Fei Wang
Summary: This study aims to propose a novel natural gas peak-shaving process using gas hydrates as the medium to address the supply-demand imbalance in natural gas. Through process simulation and economic analysis, the study shows that the proposed peak-shaving process can improve economic efficiency compared to traditional operational models.
Article
Engineering, Environmental
Chanjuan Liu, Zhen Long, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study investigates the growth and storage performance of CO2 hydrates under different conditions, and finds that the water film on silica gel particles is the main factor affecting gas storage efficiency. Silica gels with 30% water saturation can achieve the highest CO2 storage capacity. In addition, it is found that SDS can increase the CO2 storage volume ratio under high water saturation and reduce the volume ratio decay in repeated tests.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: In this study, TBAB hydrates were synthesized and their carbon capture capacity from a ternary gas mixture of CH4/CO2/N-2 was investigated. The addition of TBAB increased the specific surface area of the hydrate crystals and transformed the hydrate structure. These findings are important for the development of hydrate gas separation technology.
Article
Engineering, Environmental
Shengli Li, Shijing Zhang, Kai Su, Qiang Liu, Haonan Wu, Zhiyong Chang
Summary: This study investigates the formation and decomposition processes of binary and ternary gas hydrates. The results show that in the formation stage, CH4 is adsorbed in the hydrate cages constructed by C2H6 and C3H8. During the decompositions, CH4 and C2H6 molecules are preferentially released from the hydrate structures, while C3H8 molecules can stay in the hydrate phase.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Sotirios Nik Longinos, Mahmut Parlaktuna
Summary: This study investigates the effects of types and number of impellers and baffles on hydrate formation, showing that although rushton turbine (RT) experiments consume more energy, they have higher rates and yield of hydrate formation compared to pitched blade turbines upward pumping (PBTU) experiments.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Physical
Sotirios Nik. Longinos, Mahmut Parlaktuna
Summary: This study investigated the impact of four amino acids on hydrate formation in a methane-propane mixture-water system, showing that all four amino acids acted as promoters. Experimental results indicated that gas hydrates formed more quickly in RT experiments compared to PBTU and PBTD experiments, with SI experiments having higher hydrate formation values than radial flow single impeller experiments.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Physical
Sotirios Nik Longinos, Mahmut Parlaktuna
Summary: This study explores the impact of different types of impellers on the formation rate and energy consumption in carbon dioxide gas hydrate formation experiments. The results show that the use of a Russhton turbine in single impeller experiments yields higher initial hydrate formation rates, while the triangle turbine performs better in dual impeller experiments.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Engineering, Chemical
Sotirios Nik Longinos, Fanourios Zannikos
Summary: The study found that an increase in saturated and monounsaturated fatty acids in biodiesel/diesel mixtures can lead to faster microbial growth, while the addition of the antioxidant TBHQ can reduce microbial load. Additionally, samples with a high increase in acidity showed lower microbial activity.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Sotirios Nik. Longinos, Mahmut Parlaktuna
Summary: The study focuses on the impact of three amino acids on methane-propane hydrate formation. Aspartic acid, asparagine, and threonine all acted as inhibitors, with aspartic acid being the most powerful. Radial flow experiments showed quicker hydrate formation and better gas-liquid contact compared to mixed flow experiments.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Physical
Sotirios Nik Longinos, Dimitra-Dionisia Longinou, Erdem Celebi, Zhexenbek Toktarbay, Mahmut Parlaktuna
Summary: Experimental results showed that under 42.5 bars pressure and 2 degrees C temperature, radial flow experiments had a shorter induction time, higher hydrate yield, and faster formation rate compared to mixed flow experiments.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Physical
Sotirios Nik. Longinos, Mahmut Parlaktuna
Summary: The kinetics of methane gas hydrates formation were investigated through different experiments using dual impellers with various designs. The experiments showed that configurations with radial flow in the upper part of the shaft had better outcomes in terms of hydrate yield, rate of hydrate formation, and hydrate formation rate constant.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Physical
Sotirios Nik. Longinos, Mahmut Parlaktuna
Summary: The study found that glycine can serve as an inhibitor, while valine and arginine can work as promoters for methane-propane hydrate formation. Additionally, Rushton turbine experiments showed higher rates of hydrate formation compared to pitched blade turbines, indicating that radial flow provides better conditions for hydrate formation.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Biochemistry & Molecular Biology
Sotirios Nik. Longinos, Dionisia Dimitra Longinou, Nurbala Myrzakhmetova, Nazgul Akimbayeva, Mariamkul Zhursumbaeva, Kaldibek Abdiyev, Zhexenbek Toktarbay, Mahmut Parlaktuna
Summary: The research focuses on the heat generation during gas hydrate formation and presents a new impeller design to overcome this issue. The experiments show that using specific baffles and impeller types can enhance the rate of hydrate formation.
Review
Energy & Fuels
Sotirios Nik. Longinos, Lei Wang, Randy Hazlett
Summary: This paper provides a comprehensive review and evaluation of the application of cryogenic fracturing using liquid nitrogen (LN2) in stimulating coalbed methane (CBM) reservoirs. The study finds that cryogenic fracturing is a promising and eco-friendly technique that can effectively enhance coal rock permeability and increase CBM production.
Article
Energy & Fuels
Sotirios Nik Longinos, Antoine Dillinger, Lei Wang, Randy Hazlett
Summary: This study compared four different cryo-fracturing liquid nitrogen (LN2) treatment processes for coal stimulation. The experiments included peak compression strength, acoustic emission, and energy absorption tests, as well as scanning electron microscope observations. The results showed that water-saturated samples exhibited lower compression strength peaks compared to dry coal samples. The experiments also indicated the importance of sample water content on fracturing potential. The freezing-thawing cycle and positive freezing-thawing cycle LN2 exposure processes showed the most promising results due to the extent of fracture creation.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Sotirios Nik. Longinos, Alina Serik, Dichuan Zhang, Lei Wang, Randy Hazlett
Summary: This study investigated the effectiveness of liquid nitrogen (LN2) in fracturing coal rocks through two different processes: freezing time and freezing-thawing cycle. It was found that water-saturated specimens had lower compressive strength than dry specimens in all freezing-thawing processes. However, in the freezing time process, water-saturated experiments showed higher compressive strength compared to dry experiments. SEM observation revealed the formation of new fractures and expansion of preexisting crevices, creating fracture networks. The consolidation forces among coal particles were compromised by the frost force resulting from LN2 treatment, leading to the formation of new fractures.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Polymer Science
Ayatzhan Akhmetzhan, Nurbala Myrzakhmetova, Nurgul Amangeldi, Zhanar Kuanyshova, Nazgul Akimbayeva, Saule Dosmaganbetova, Zhexenbek Toktarbay, Sotirios Nik. Longinos
Summary: Scientists are exploring various methods for removing harmful heavy metal ions and dyes from water bodies, with adsorption technique showing promising results. DMAA-based hydrogels have garnered interest due to their reusability, simplicity of synthesis, and ease of processing, making them suitable for practical applications. This review discusses recent studies on DMAA-based hydrogels for dye removal, hazardous heavy metal ion removal, self-healing materials, and enhancing mechanical properties.
Article
Energy & Fuels
Sotirios Nik Longinos, Mahmut Parlaktuna
Summary: The study showed that radial flow experiments exhibited better behavior in hydrate formation for the methane-propane mixture, while lysine acted as a promoter for hydrate formation. RT experiments consumed more energy compared to PBT ones, with shorter induction times.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
