Article
Chemistry, Multidisciplinary
Muhammad A. Kamel, Aleksei S. Lobasov, Surya Narayan, Konstantin S. Pervunin, Christos N. Markides
Summary: This study investigates the growth mechanism and process of hydrate formation by observing the process on a water drop immersed in liquid cyclopentane. The study reveals that the morphology of hydrate film changes with the subcooling temperature, and the growth rate of hydrate varies with the degree of subcooling.
CRYSTAL GROWTH & DESIGN
(2023)
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
Energy & Fuels
Amir Saberi, Abdolmohammad Alamdari, Ali Rasoolzadeh, Amir H. Mohammadi
Summary: This study investigated the impact of three chemicals at different concentrations on gas hydrate formation, and identified the optimal choices. Furthermore, the combination of PVP and MEG in an aqueous solution was found to have a simultaneous synergistic impact on both natural gas hydrate formation induction time and the rate of gas consumption.
Article
Chemistry, Multidisciplinary
Wenjuan Zhang, Yanhong Wang, Xuemei Lang, Shuanshi Fan
Summary: This study measured the adhesion forces of hydrates with different hydrate inhibitors and found that thermodynamic inhibitors increased the adhesion force, while anti-agglomerant inhibitors decreased it.
Article
Engineering, Environmental
Parul Sahu
Summary: Clathrate hydrates are gaining attention for their applications in water reclamation, with advancements in forming agents and kinetic promoters playing a key role in accelerating the hydrate formation and water recovery process. Additionally, developments in novel reactor designs, efficient separation methods, and hybrid processes are making clathrate hydrate technology a strong candidate for future water reclamation from waste effluents.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Byeonggwan Lee, Kyuchul Shin, Sanehiro Muromachi, Igor L. Moudrakovski, Christopher I. Ratcliffe, John A. Ripmeester
Summary: Antifreezes such as methanol and ammonia can enhance methane storage in binary clathrate hydrates like THF and TBAB. Methanol acts as a catalyst for methane hydrate formation and induces TBAB hydrates to form an orthorhombic structure suitable for methane storage. These findings suggest that methanol could play a crucial role in hydrate-based methane storage systems.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Hyunglok Chu, Kyuchul Shin
Summary: Xenon (Xe) and krypton (Kr) are used in various important industries, but their separation is energy-intensive. This study shows that clathrate hydrates can be used for cost-effective Xe-Kr separation. The hydrate-based approach captures Xe selectively and requires milder temperature conditions compared to cryogenic distillation. It suggests that this method is an excellent alternative to the energy-intensive cryogenic distillation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Thermodynamics
Foroozan Keshavarzi, Jafar Javanmardi, Khashayar Nasrifar, Amir H. Mohammadi
Summary: The study aimed to estimate the effects of different aqueous solutions on hydrates using a model. Evaluation of 828 experimental data points showed the high accuracy of the model, with comparisons indicating excellent agreement between the predicted values and experimental data.
FLUID PHASE EQUILIBRIA
(2021)
Article
Energy & Fuels
Ali Rasoolzadeh, Ali Bakhtyari, Khayyam Mehrabi, Jafar Javanmardi, Khashayar Nasrifar, Amir H. Mohammadi
Summary: This study presents a new method for calculating water activity in gas hydrate systems using the van der Waals-Platteeuw model. The model incorporates both short-range and long-range interactions and has been tested against a comprehensive database, showing excellent performance. It is capable of accurately predicting gas hydrate dissociation temperatures in complex systems.
Article
Thermodynamics
Hesam Najibi, Arezoo Azimi, Jafar Javanmardi, Reza Roozbahani, Amir H. Mohammadi
Summary: The study focused on the impact of hydrate inhibitors on the stability conditions of natural gas hydrates. Experimental measurements were conducted to determine the stability conditions of natural gas hydrates in different concentrations of hydrate inhibitors and salt solutions. By developing a thermodynamic model and measuring the activity of the aqueous phase, the accuracy of the model was improved.
FLUID PHASE EQUILIBRIA
(2022)
Article
Chemistry, Physical
Satoshi Takeya, Akihiro Hachikubo, Hirotoshi Sakagami, Hirotsugu Minami, Satoshi Yamashita, Masayoshi Takahashi, Keiichi Hirano, Kazuyuki Hyodo, Akio Yoneyama
Summary: Understanding the dissolution processes of natural methane (CH4) hydrates is crucial for assessing the amount of methane released into seawater from unconventional natural gas resources. High-resolution experiments have successfully visualized the spatial relationships between methane hydrates and seawater, revealing that dissociation of methane hydrates leads to the formation of microbubbles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Energy & Fuels
Chuanwen Sun, Shimin Liu, Shouding Li, Kai Wang, Yiming Sun, Xiao Li, Zhaobin Zhang
Summary: Nano-SiO2 particles can accelerate the formation of tetrahydrofuran hydrate and shorten the induction time, with an optimal mass concentration of 0.5 mg/mL.
Article
Chemistry, Multidisciplinary
Riku Matsuura, Saman Alavi, Ryo Ohmura
Summary: This study presents visual observations of the formation and growth of structure-H hydrate formed with methane and 1-methylpiperidine (MPD). The crystal growth dynamics were categorized into two types depending on the subcooling temperature, showing changes in crystal shape and size with different subcooling conditions. The implications of crystal morphology on suitable conditions for industrial utilization of this hydrate for gas capture applications are discussed.
CRYSTAL GROWTH & DESIGN
(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, Multidisciplinary
Mohsen Abbaspour, Fateme Fotourechi, Hamed Akbarzadeh, Sirous Salemi
Summary: In this study, water molecules in fixed and rigid (15,0) CNTs formed a hexagonal ice nanotube. The addition of methane molecules replaced the hexagonal structure of confined water molecules. When inhibitors were added to methane clathrates in CNT, benzene, [emim(+)][Cl-] IL, methanol, NaCl, and THF were found to have different inhibition behaviors. [emim(+)][Cl-] IL showed the best inhibition effects, while THF and benzene were more effective than NaCl and methanol. The IL and THF inhibitors tended to aggregate, while benzene and IL molecules were distributed along the CNT and affected the behavior of THF as an inhibitor in the CNT. Furthermore, the IL had stronger inhibition effects in the armchair (9,9) and the flexible (15,0) CNTs compared to other systems.
Article
Engineering, Chemical
Qing Han, Mengqing Shi, Linkai Han, Di Liu, Mingwei Tong, Yuxin Xie, Zhonghua Xiang
Summary: Developing highly efficient bifunctional oxygen electrocatalysts is crucial for zinc-air flow batteries. Metal-organic frameworks (MOFs) and covalent organic polymers (COPs) have emerged as promising alternatives due to their designable and controllable atomic-level structures. However, their catalytic performances are limited by conductivity and catalytic activity. In this study, nanosheet FeNi-MOF and iron phthalocyanine rich COP hybrid materials are assembled through the pi-pi stacking effect to create highly efficient bifunctional electrocatalysts. The resulting catalyst exhibits superior catalytic performance and stability, making it a promising candidate for zinc-air flow batteries.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Daria Grigorash, Dmytro Mihrin, Rene Wugt Larsen, Erling H. Stenby, Wei Yan
Summary: The article introduces a new approach to describe the cross-association between molecules, allowing for the simulation of weakly bound molecular complexes with different conformations in mixtures. By incorporating this approach into the equation of state, accurate predictions of vapor-liquid equilibrium and liquid-liquid equilibrium can be made. The new method is validated through experiments on alcohol and acid mixtures, with the results compared to experimental data, demonstrating its accuracy and reliability.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Mohammed Al-Sharabi, Daniel Markl, Vincenzino Vivacqua, Prince Bawuah, Natalie Maclean, Andrew P. E. York, Axel Zeitler
Summary: This study used terahertz pulsed imaging to investigate the transport process of different solvents into ceramic catalytic materials. The results showed that the heating rate of the samples influenced the water transport rate, while the viscosity of 1-octanol slowed down its transport.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chukwunonso Anyaoku, Sati Bhattacharya, Rajarathinam Parthasarathy
Summary: This study aimed to enhance understanding of settling dynamics in viscoelastic fluids by developing a semi-empirical correlation and a dimensionless ratio, which accurately described the characteristics of settling suspensions.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Antti I. Koponen, Janika Viitala, Atsushi Tanaka, Baranivignesh Prakash, Olli-Ville Laukkanen, Ari Jasberg
Summary: This study focuses on the development of foam application chemicals for the paper and board industry. The research explores the rheology of the polyvinyl alcohol foam used in the process. Measurements were conducted to determine the foam viscosity and slip flow. The results suggest that slip flow contributes significantly to the total flow rate, and the obtained viscosity and slip models provide a solid foundation for industrial processes.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Dalei Sun, Jinghui Cai, Yating Yang, Zhiwu Liang
Summary: In this study, Fe-doped alpha-Bi2O3 catalysts with different Fe/Bi molar ratios were synthesized and utilized in the carbonylation of isobutyl amine with CO2. The results showed that Fe doping significantly enhanced the catalytic abilities of alpha-Bi2O3.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Yuan Tian, Xinxin Wang, Yanrong Liu, Wenping Hu
Summary: This paper predicts the solubility of nitrogen gas in ionic liquids (ILs) using two quantitative structure-property relationship (QSPR) models. By combining machine learning methods and ionic fragments contribution method, the accuracy and reliability of the prediction models are improved.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Liwang Wang, Wei Liu, Pan Yang, Yulong Chang, Xiaoxu Duan, Lingyu Xiao, Yaoming Hu, Jiwei Wu, Liang Ma, Hualin Wang
Summary: This study investigates the effective phase interfacial area (ae) of hydro-jet cyclones at different injection angles. The results show that a 45 degrees upward incidence angle yields the most favorable flow field characteristics for efficient mass transfer. The significant enhancement in ae of the hydro-jet cyclones offers the advantage of reducing equipment volume and cost savings.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chuanjun Wu, Jiangzhi Chen, Jiyue Sun, I-Ming Chou, Shenghua Mei, Juezhi Lin, Lei Jiang
Summary: In this study, the solubility of H2S hydrate in water was measured using Raman spectroscopy. The results showed that the solubility increases with temperature under certain equilibrium conditions, and the solubility also depends on pressure and temperature under different equilibrium conditions. A thermodynamic model based on the van der Waals-Platteeuw theory was developed to predict the solubility, demonstrating its accuracy.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Lorenzo Brivio, Serena Meini, Mattia Sponchioni, Davide Moscatelli
Summary: This study investigates the influence of three main parameters and proposes a kinetic model to predict the optimal operating conditions for high yield of dimethyl terephthalate (DMT) in the chemical recycling process of polyethylene terephthalate (PET).
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Hongju Lin, Fanhui Liao, Yanchang Chu, Mingyu Xie, Lun Pan, Yuanyuan Wang, Lijian Leng, Donghai Xu, Le Yang, Gangfeng Ouyang
Summary: A honeycomb NiCo/C-Na catalyst with a micro-meso-macroporous structure has been fabricated and shown to have significantly higher catalytic activity for the decarboxylation of fatty acids. It also proves to be efficient in upgrading sludge HTL bio-crude, resulting in a biofuel with decreased viscosity and increased density.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Xiaoxian Li, Rui Li, Min Lin, Mingde Yang, Yulong Wu
Summary: A series of coated non-noble metal porous carbon catalysts were synthesized and applied to the aqueous-phase deoxygenation of algal bio-oil. One of the catalysts showed excellent deoxygenation selectivity and catalytic activity at 250 degrees C. The catalyst exhibited good hydrothermal stability and the reaction mechanism was proposed based on product analysis and active site analysis.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
M. V. Chudakova, M. V. Popov, P. A. Korovchenko, E. O. Pentsak, A. R. Latypova, P. B. Kurmashov, A. A. Pimenov, E. A. Tsilimbaeva, I. S. Levin, A. G. Bannov, A. V. Kleymenov
Summary: A series of catalysts with different potassium contents were prepared using solution combustion synthesis and characterized using various techniques. The results showed that the potassium content affected the phase composition and texture of the catalysts. The addition of a small amount of potassium resulted in a change in particle size distribution, leading to higher hydrogen yield. The Ni-1%K2O/Al2O3 catalyst exhibited the highest hydrogen yield at temperatures of 675 and 750 degrees Celsius.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Aliakbar Roosta, Nima Rezaei
Summary: In this study, we modified the electrolyte cubic plus association equation of state (e-CPA EoS) and integrated it with two electrical conductivity models to estimate the electrical conductivity of 11 monovalent electrolyte solutions in water. The modified e-CPA model demonstrated better performance and the hybridization with electrical conductivity models resulted in two predictive models for estimating the electrical conduction of dilute and concentrated electrolyte solutions. These predictive models showed relative average percentage deviations (AARD) of 11.15% and 13.87% over wide ranges of temperature and electrolyte concentration.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Haoren Niu, Jianzheng Wang, Qingzhu Jia, Qiang Wang, Jin Zhao, Fangyou Yan
Summary: A study developed two quantitative structure-property relationship models for the complexation performance of alpha- and beta-cyclodextrins and validated their stability and predictive ability through internal and external validation. The models showed robustness and satisfactory performance, as demonstrated by the experimental results and model validations. These models can effectively predict the binding constants between cyclodextrins and various types of molecules, providing valuable tools for cyclodextrin design.
CHEMICAL ENGINEERING SCIENCE
(2024)