Article
Engineering, Chemical
Qian Zhang, Malcolm A. Kelland
Summary: Kinetic hydrate inhibitors (KHIs) have been used for over 25 years in oil and gas production flowlines to prevent gas hydrate formation. The main component in KHI formulations is a water-soluble polymer, with polymaleamides showing significant performance enhancement in inhibiting gas hydrate formation. Studies have improved our understanding of the optimal structural features for KHI polymers.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
Huiyong Liang, Dawei Guan, Yuda Liu, Lunxiang Zhang, Jiafei Zhao, Lei Yang, Yongchen Song
Summary: This study used in situ high-resolution X-ray computed tomography measurements to explore the mechanisms of hydrate growth in the presence of surfactants. It was found that the presence of hydrate crystals triggered enhanced growth on the reactor wall. A time delay was observed before the bulk water reservoir transformed into hydrate. The lower interfacial tension between the hydrate surface and the solution facilitated its adsorption onto the reactor wall. These fundamental results are valuable for understanding the mechanism of hydrate growth in the presence of surfactants and its potential applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Review
Energy & Fuels
Ankur Singh, Ajay Suri
Summary: This review comprehensively discusses the performance and influencing factors of cyclic-amide-based kinetic hydrate inhibitors, presenting the top ten KHIs with the highest performance in terms of cloud point and induction time. The synergistic effects of guanidinium salts and phosphonium salts on these KHIs are also highlighted.
Article
Energy & Fuels
Ankur Singh, Ajay Suri, Divyansh Chandravanshi
Summary: To ensure the smooth operation of the oil and gas industry, it is crucial to prevent hydrate blockages in pipelines. Synthetic kinetic hydrate inhibitors (KHIs) are commonly used, but they pose disposal concerns due to poor biodegradability. This study investigates the use of a natural and biodegradable polysaccharide, lambda carrageenan, as a standalone KHI and in combination with biodegradable solvents and commercial KHI polymers. The results show that lambda carrageenan exhibits hydrate inhibition performance comparable to commercial KHIs when used alone or in combination with solvents or polymers.
Article
Engineering, Environmental
Yi Lu, Hui Wang, Qingping Li, Xin Lv, Yang Ge, Lunxiang Zhang, Jiafei Zhao, Lei Yang, Yongchen Song
Summary: This study validates the feasibility of hydrate-based gas storage method for low-concentration flue gas through molecular dynamics simulations. The results show that proper subcooling can improve the hydrate growth rate and the occupancy of CO2 molecules in newly formed hydrate cages.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Qian Zhang, Malcolm A. Kelland, Evan M. Lewoczko, Caleb A. Bohannon, Bin Zhao
Summary: The use of zwitterionic polymers as kinetic hydrate inhibitors (KHIs) in gas and oil industry has shown promising results, with the key performance parameter being the length of the alkyl chain on the monomer unit side chains. Copolymers of the zwitterionic monomers and NIPMAM exhibit better increase in KHI performance with increasing concentration, suggesting the importance of strong hydrogen-bonding groups for high KHI performance.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Ankur Singh, Ajay Suri
Summary: Hydrate formation experiments were conducted to evaluate the synergy between three natural proteins and four standard reference kinetic hydrate inhibitors. The results showed that casein peptone had the best synergy with PVCap, whey protein had the best synergy with HIOP-1800, and bovine serum albumin consistently showed synergy with the standard KHIs.
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
Liwen Li, Xiao Wang, Youguo Yan, Joseph S. Francisco, Jun Zhang, Xiao Cheng Zeng, Jie Zhong
Summary: This study investigates the nucleation process of natural gas hydrates at different degrees of supercooling using molecular dynamics simulations. The concept of a transition layer is proposed to explain the distinct nucleation phenomena observed at different supercoolings.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
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
Engineering, Environmental
Alberto Maria Gambelli, Federico Rossi
Summary: In this study, methane hydrates were analyzed for their thermodynamic and kinetic properties in the presence of fresh water and a pure quartz porous medium. The Labile Clusters Theory was used to calculate the hydrate formation rate as a first-order chemical kinetic equation, providing insights into the time dependence of the process. Pressure variations were also discussed, revealing consistent similarities with other parameters and allowing for a detailed characterization of the entire process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Yanzhen Liu, Yang Zhao, Yuxin Jia, Lunxiang Zhang, Lei Yang, Jiafei Zhao
Summary: Fine clay particles from a hydrate rich area in the South China Sea were found to adsorb kinetic hydrate inhibitors, leading to a weakened inhibition effect. Future dosage adjustments in marine environments should carefully consider the effects of clay-rich conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Xue Zou, Mucong Zi, Tiantian Wu, Yuanxin Yao, Caifeng Yang, Daoyi Chen
Summary: In this study, four new kinetic hydrate inhibitors (KHIs) were successfully synthesized by introducing 1-vinylimidazole (VI) or vinylacetate (VAc) monomer using radical polymerization method. These newly-synthesized copolymer KHIs exhibited high cloud points and biodegradability, and showed remarkable inhibition performance on hydrate nucleation and growth. A novel inhibition mechanism hypothesis was proposed to explain the inhibitory effect of these new KHIs under high subcooling conditions.
Article
Polymer Science
Jianlong Wang, Jinsheng Sun, Hang Bian, Qibing Wang, Zhenbo Feng, Cheng Lu, Han Ren, Rongchao Cheng, Jintang Wang, Ren Wang
Summary: Natural gels have attracted global research attention for their greenness, environmental-friendliness, and good hydrate inhibition performance. This study evaluated the inhibition performance of xanthan gum and pectin on hydrate nucleation and growth in sediment environments and revealed the internal inhibition mechanisms. The study also investigated the effects of natural gels on sediment dispersion stability and low-temperature fluid rheology.
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
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)