Article
Chemistry, Multidisciplinary
Xiaohui Wen, Yanju Luo, Yujia Deng, Xiaoliang Zeng, Yunfei Tian, Juan He, Xiandeng Hou
Summary: In this study, a novel system was designed to integrate in situ spectral monitoring with facile synthesis of lanthanide metal-organic frameworks in dielectric barrier discharge (DBD) plasma. The system provides a cost-effective and universal solution for gaining insight into the reactive processes through in situ spectral information of scattering and luminescence.
CHEMICAL COMMUNICATIONS
(2022)
Article
Energy & Fuels
Minwei Sun, Nima Rezaei, Abbas Firoozabadi
Summary: This study investigates the effectiveness of dispersants and crystal modifiers in mitigating wax deposition from crude oils and gas condensates. The results show that water has a significant effect on dispersants, and the concentration of additives, flow rate, and brine also influence wax deposition.
Article
Thermodynamics
Jia Liu, Decai Lin, Deqing Liang, Junhui Li, Zhiguang Song
Summary: Hydrates and waxes are major flow assurance issues in deep-water multi-phase transport units in the energy industry. This study investigates the anti-aggregation performance of an eco-friendly amphoteric surfactant, CAPB, in wax-containing oil-water systems. The concentration of CAPB and wax content synergistically influence its anti-aggregation performance. Adding 1.5 wt% CAPB effectively inhibits hydrate formation and improves flow in oil-water systems without wax. Adding 2.0 wt% CAPB slows hydrate growth rate and reduces inter-particle aggregation in waxy oil-water systems.
Article
Thermodynamics
Ling Lu, Zhigao Sun
Summary: The study found that ice slurry prepared with a lower oil-water mass ratio has a smaller ice percent factor (IPF), while the addition of hexanol can effectively improve the fluidity and increase the apparent viscosity of the ice slurry. There is no phase separation of the microemulsion in the ice slurry melting/freezing cycling, and the morphology and growth process of ice crystals at different experimental temperatures vary.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Energy & Fuels
Liang Wang, Yifei Wang
Summary: By using numerical calculation and simulation to study the effects of different fin thickness, fin space, and the number of ducts on the heat storage and release process of paraffin, it is found that optimized parameters can improve the performance of the paraffin regenerator, showing the significant role of heat transfer between air and paraffin. The best combination regenerator can maintain indoor heating for eight hours with its melting degree and released heat.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Sedi Helsper, Matthew W. Liberatore
Summary: Increasing oil production from cold environments has led to flow assurance issues caused by wax deposition and hydrate formation. This study investigates the high-pressure flow properties of waxy oils and finds that wax concentration has a larger effect on wax appearance temperature than pressure. Understanding waxy oil rheology under methane-saturated, high-pressure conditions is crucial for addressing flow assurance challenges in cold environments.
Article
Energy & Fuels
Jia Liu, Jing Wang, Ti Dong, Deqing Liang
Summary: The formation of wax crystals and hydrates in deep-sea crude oil can affect the nucleation, growth, aggregation, and crystal structure of hydrates. Specifically, wax crystals inhibit hydrate formation, while hydrate formation reduces wax crystal aggregation, improving the flow characteristics of the hydrate slurry. Wax has no effect on the crystal structure of CH4 hydrate but impacts the distribution of the gas in cavities.
Article
Engineering, Environmental
Peng Xue, Xiao-Tian Jiang, Mi Qu, Tiqing Zhao, You -Hong Jiang, Yifan Ying, Yong Luo, Dan Wang, Guang-Wen Chu, Jian-Feng Chen, Shi-Gang Sun, Hong -Gang Liao
Summary: Using in situ liquid cell transmission electron microscopy (TEM), we observed the crystal growth at flow condition with high resolution in real time, and discovered the formation of solute rich dense liquid phase near the surface at ultra-low precursor concentration, which then transformed into nanocrystals. The merging of dense phase droplets accelerated dendritic crystal growth, and the anisotropic crystal growth was controlled by the shape evolution of the dense phase. Our study deepens the understanding of crystal growth mechanisms, which is crucial for determining reaction dynamics and designing hierarchical nanomaterials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jinchen Cao, Lang Liu, Chao Liu, Chao He
Summary: Molecular dynamics simulations were used to investigate the phase change mechanisms of paraffin wax in crude oil. It was observed that in the absence of a pour point depressant, paraffin crystals formed tangled three-dimensional networks that are difficult to dissolve in the oil phase. The viscosity and phase transition temperature of the system increased with the chain length of paraffin molecules. The addition of a pour point depressant prevented the formation of insoluble networks and resulted in homogeneously distributed paraffin crystals with lower viscosity and phase transition point.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Sebastian T. Emmerling, Luzia S. Germann, Patrick A. Julien, Igor Moudrakovski, Martin Etter, Tomislav Friscic, Robert E. Dinnebier, Bettina Lotsch
Summary: Covalent organic frameworks (COFs) are a new class of molecularly precise, porous functional materials with diverse applications. This research provides experimental evidence of solvent-based COF templating and advances the understanding of mechanochemistry as a green route for COF synthesis. The study reveals key reaction intermediates in the synthesis of imine COFs and the role of a solid-state catalyst in directing reaction kinetics and mechanism.
Article
Chemistry, Multidisciplinary
P. Tim Prins, Johanna C. van Der Bok, Thomas P. van Swieten, Stijn O. M. Hinterding, Andy J. Smith, Andrei V. Petukhov, Andries Meijerink, Freddy T. Rabouw
Summary: The synthesis of beta-NaYF4 nanocrystals from alpha-NaYF4 precursor particles was investigated using in situ small-angle and wide-angle X-ray scattering and ex situ electron microscopy. It was observed that the particle size distribution evolved from unimodal to bimodal, and eventually back to unimodal, with the final distribution being narrower than the initial distribution. The splitting of the size distribution was attributed to variations in the reactivity of the precursor particles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Ida Gjerlevsen Nielsen, Magnus Klove, Martin Roelsgaard, Ann-Christin Dippel, Bo Brummerstedt Iversen
Summary: In this study, the formation mechanisms and crystal structure transformations of gallium oxides during solvothermal synthesis were investigated using in situ X-ray diffraction. It was found that the formation mechanism of γ-Ga2O3 involves the transformation from γ-Ga2O3 to β-Ga2O3, while GaOOH and Ga5O7OH form in aqueous solvent at low temperatures. The properties of the resulting products can be controlled by adjusting synthesis parameters such as temperature, heating rate, solvent and reaction time.
Article
Chemistry, Multidisciplinary
Sichuang Xue, Xin Li Phuah, Jie Jian, Qiang Li, Jin Li, Bo Yang, Di Zhang, Han Wang, Thomas Tsakalakos, Amiya K. Mukherjee, Haiyan Wang, Xinghang Zhang
Summary: Flash-sintered ceramics show better mechanical deformability than conventional sintered ceramics, and the high-density defects formed under electrical field plays a key role. However, direct experimental evidence for defect formation and evolution is lacking. In this study, in situ TEM experiments were conducted to observe the defect dynamics in flash-sintered and conventionally sintered TiO2. The results showed that both types of samples exhibited the coalescence of point defects and the formation of stacking faults under electrical field. Surprisingly, the fault growth rate in flash-sintered samples was 10 times higher than that in conventionally sintered samples, and the formation of the Magneli phase was only observed in flash-sintered samples.
Article
Chemistry, Multidisciplinary
Max Rautenberg, Biswajit Bhattacharya, Julia Witt, Mohit Jain, Franziska Emmerling
Summary: This study provides the first in situ real-time monitoring of the mechanochemical formation mechanism of mixed-ligand MOFs and reveals that binary phases can serve as intermediates or competing products in one-pot and stepwise synthesis.
Article
Energy & Fuels
Qianli Ma, Yang Liu, Xiaofang Lv, Shidong Zhou, Yingda Lu, Chuanshuo Wang, Jing Gong
Summary: This study explores the dynamic formation process of wax depositions in water-in-oil emulsions using particle video microscope. Two types of wax deposition structures were observed, formed by the collision and aggregation of wax crystals and water droplets. The study also reveals the influence of surfactant concentration and water content on the deposition structures.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Farbod Sharif, Ali Shayesteh Zeraati, Pejman Ganjeh-Anzabi, Nael Yasri, Maria Perez-Page, Stuart M. Holmes, Uttandaraman Sundararaj, Milana Trifkovic, Edward P. L. Roberts
Article
Energy & Fuels
Sina Ehsani, Anil K. Mehrotra
Article
Chemistry, Physical
Umer Farooq, Syed Atif Pervez, Alfred Junio Samson, Sanoop Palakkathodi Kammampata, Pejman Ganjeh-Anzabi, Milana Trifkovic, Venkataraman Thangadurai, Edward P. L. Roberts
APPLIED SURFACE SCIENCE
(2020)
Article
Engineering, Chemical
Sina Ehsani, Anil K. Mehrotra
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2020)
Article
Construction & Building Technology
Edna J. Molina Bacca, Andy Knight, Milana Trifkovic
SUSTAINABLE CITIES AND SOCIETY
(2020)
Review
Engineering, Chemical
Anil K. Mehrotra, Sina Ehsani, Samira Haj-Shafiei, Adebola S. Kasumu
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2020)
Article
Engineering, Chemical
Steven D. Herman, Anil K. Mehrotra
Summary: Research shows that fouling in OTSGs introduces significant thermal resistance, reducing heat transfer rate and increasing tube-wall temperature, potentially exceeding safe operating limits.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Review
Engineering, Chemical
Simant R. Upreti, Anil K. Mehrotra
Summary: This work delves into the complex phenomenon of gas diffusion in liquids, highlighting the challenges in estimating diffusivity and presenting various experimental methods for determining gas diffusivity. It summarizes diffusivity data for a wide range of gas-liquid systems and provides empirical correlations for interpolating gas diffusivity.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Anil K. Mehrotra, Kunal Karan, Michael S. Kallos, Arindom Sen, Sina Ehsani, Brett Abraham, Erin L. Roberts
Summary: Leo Augustus Behie was a dedicated teacher and mentor, known for his research in classical chemical engineering challenges, biotechnology, and biomedical engineering. He founded a unique research laboratory at the University of Calgary and trained numerous doctoral students, master's degree students, and postdoctoral scholars. His research ranged from gas-solid fluidized bed reactors to cellular secretome studies for developing a cure for Parkinson's disease.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Editorial Material
Engineering, Chemical
Anil K. Mehrotra, Kunal Karan, Michael S. Kallos, Arin Sen
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Review
Engineering, Chemical
Anil K. Mehrotra, Peter Englezos
Summary: This paper reviews the research contributions of Professor Bishnoi in the field of chemical engineering. With a productive and illustrious career spanning over four decades, Prof. Bishnoi has made significant contributions to understanding thermodynamics, kinetics, and process design in chemical engineering. The review highlights his academic achievements and the impact of his research in various areas, including gas hydrates and hydrocarbon systems.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Anil K. Mehrotra, Joao B. P. Soares, Krishnaswamy Nandakumar, Pierre J. Carreau, Norman Epstein, Gregory S. Patience
Summary: The history and achievements of The Canadian Journal of Chemical Engineering highlight the multifaceted development of chemical engineering and its crucial role in advancing chemical sciences and engineering.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Editorial Material
Engineering, Chemical
Peter Englezos, Anil K. Mehrotra
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Saheli Rao, Sivanesh Murugan, Gopal Achari, Basil Perdicakis, Anil K. Mehrotra
Summary: Steam generation at steam-assisted gravity drainage facilities produces large amounts of wastewater with high pH and high silica levels. Neutralization of these concentrated streams results in the formation of a gel-like substance, making filtration of amorphous silica gel difficult. Experimental investigation was conducted to study the effects of SiO2 concentration, NaCl:SiO2 ratio, and pH. Response surface methodology was applied to optimize the responses and determine the optimal ranges of independent factors for maximum silica removal and filtration effectiveness.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Editorial Material
Engineering, Chemical
Anil K. Mehrotra, Ajay K. Dalai, Simant R. Upreti, Suddhasatwa Basu, Chinthapudi Eswaraiah, Ranjan K. Dwari
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)