Article
Engineering, Chemical
Kening Sun, Xixi Ma, Ruijun Hou
Summary: Hydrodesulfurization (HDS) is an effective way to address corrosion problems in refineries. In this study, HDS of Siberian crude oil was conducted using Ni-Mo/gamma-Al2O3 in a continuous flow isothermal trickle-bed reactor, achieving a conversion rate of 92.89%. The established model is useful for industrial application and provides further insight into the HDS process of Siberian crude oil.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Agricultural Engineering
Nabin Aryal, Mikkel Odde, Cecilie Bogeholdt Petersen, Lars Ditlev Morck Ottosen, Michael Vedel Wegener Kofoed
Summary: The study demonstrates the methanation and upgrading of syngas to biomethane in a fed-batch trickle-bed reactor system using manure or sludge-based inoculum. Addition of exogenous H2 allows for further upgrading of syngas to biomethane in the same reactors, showing functional redundancy among microbial communities.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Chemical
Liang -Liang Zhang, Fu-Ying Wang, Yi -Dong Zhang, Guang -Wen Chu, Jian-Feng Chen
Summary: A mathematical model for the chemical deacidification process was developed, and a rotating packed bed reactor was found to enhance the deacidification efficiency. Under optimal conditions, a deacidification efficiency of 99.85% was achieved through continuous treatment, with a significantly reduced reaction time and avoided excess alkali consumption.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Mouad Hachhach, Vincenzo Russo, Dmitry Yu. Murzin, Tapio Salmi
Summary: This study aimed to develop a general heterogeneous multiscale model for continuous trickle bed reactors, enabling calculation of concentration and temperature changes as well as the stationary behavior. The model simultaneously solved energy and mass balances for both gas and liquid phases, as well as stagnant catalyst particles. Well-established correlations for mass transfer coefficients and pressure drop equations were used. The model is general and can be applied for other bed reactors and arbitrary reaction schemes. Simulation results showed that complete sugar conversion was achieved only for small catalyst particles, and the reactor length had a greater impact on arabinose conversion than residence time or bed radius.
Article
Engineering, Environmental
Sambit Dutta, Hariklia N. Gavala, Ioannis Skiadas
Summary: This study aims to develop a model to simulate the mass transfer of gases to the liquid phase, as well as a model to predict the volumetric mass transfer coefficient of specific gases under different flow rates and reactor configurations. The models were validated using experimental data and the predicted kLa values had a reasonable range of error.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Akarsha Srivastava, Krishna Nigam, Shantanu Roy
Summary: Trickle bed reactors, widely used in the process and refining industry, are being challenged to provide solutions for deep processing of feedstocks. This study quantifies the impact of packed bed structure on reactor hydrodynamics and discusses the effects of different packing techniques and liquid distribution on overall performance metrics.
Article
Chemistry, Organic
Gantumur Baasandorj, Enkhsaruul Byambajav, Narangerel Janchig, Tugsuu Tserendorj
Summary: In this study, hydrotreatment of middle distillates of Mongolian coal tars was conducted to obtain a clean feed for diesel fuel. The results showed that hydrodesulfurization proceeded deeply with activities over 80%, while hydrodenitrogenations and hydrodeoxygenations had lower activities. Based on elemental analysis, the HDO activities of middle distillates were very low.
PETROLEUM CHEMISTRY
(2022)
Article
Engineering, Chemical
Run Guo, Bin Wei, Xingying Lan, Jinsen Gao, Xiaogang Shi
Summary: The flow behavior of liquid film in trickle bed reactors was studied, revealing that liquid tends to accumulate on the contact point between adjacent particles. Increasing the liquid inlet flow rate can improve both the wetting ratio and thickness of the particle surface wetted by the liquid film, while increasing the wettability of the particle surface only improves the wetting ratio, with little effect on the liquid film thickness.
Article
Engineering, Chemical
John Eleeza, Sundaramurthy Vedachalam, Philip Boahene, Ajay K. Dalai, John Adjaye
Summary: The study found that LHSV is the key factor affecting fines deposition, with higher LHSV resulting in decreased deposition. Pressure and temperature show interactive effects, with specific combinations minimizing deposition. The opposite surface charges of fines and the catalyst create an attractive force leading to fines deposition.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Applied
Bogdan Shumeiko, Milos Auersvald, Dan Vrtiska, Pavel Simacek, Petr Straka, David Kubicka
Summary: The study explores the stabilization of pyrolysis bio-oil using NiMo/Al2O3 catalyst in a fixed bed reactor, showing that lower average temperature in the reactor can yield stabilized bio-oil with comparable physicochemical properties to bio-oil hydrogenated at higher temperatures. Furthermore, the catalyst's long-term stability is higher when using a slower temperature ramp. This research also demonstrates that there is no sulfur loss from the NiMo/Al2O3 catalyst during bio-oil hydrotreatment.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Dominik Andreides, Dominik Stransky, Jana Bartackova, Dana Pokorna, Jana Zabranska
Summary: This study investigated the effect of different temperatures on the biomethanation of Syngas and found that CH4 production increased with increasing temperature. The CH4 production under hyper-mesophilic conditions was comparable to thermophilic conditions, resulting in potential energy savings and reduced operating costs.
Article
Thermodynamics
Panagiotis Tsapekos, Laura Treu, Stefano Campanaro, Victor B. Centurion, Xinyu Zhu, Maria Peprah, Zengshuai Zhang, Panagiotis G. Kougias, Irini Angelidaki
Summary: This study demonstrates the production of high-purity methane through biological CO2 hydrogenation under real environmental conditions with a trickle bed reactor. The microbial community in the reactor showed distinct clustering characteristics, with different layers of packing material and liquid phase having varying effects on the reaction process.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Chemical
Haoan Fan, Zhecheng Fang, Xuezhi Zhao, Yangyang Hu, Bolong Li, Wulong Yang, Mian Li, Jianghao Wang, Xiuyang Lu, Weiyu Song, Jie Fu
Summary: This study proposes a viable continuous approach for maltose hydrogenation using a millimeter-scale Raney Ni in a trickle-bed reactor. The optimal reaction conditions were determined through a parametric study, resulting in high conversion of maltose and yield of maltitol. A detailed investigation of the reaction mechanism and the utilization of biomass-derived sugars demonstrates the potential of the continuous flow system based on a trickle-bed reactor in industrial applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Konstantinos Asimakopoulos, Martin Kaufmann-Elfang, Christoffer Lundholm-Hoffner, Niels B. K. Rasmussen, Antonio Grimalt-Alemany, Hariklia N. Gavala, Ioannis Skiadas
Summary: By comparing the performance of different scale reactors, it was found that the novel semi-pilot scale reactor had a higher efficiency in converting syngas to methane under identical operating conditions.
Article
Energy & Fuels
Run Guo, Bin Wei, Huanzhi Liu, Xiaogang Shi, Xingying Lan, Jinsen Gao
Summary: This study conducted experimental research to investigate the impact of gas/liquid velocity, particle packing method, and liquid properties on the characteristics of liquid dispersion in a pseudo-two-dimensional trickle bed reactor. By utilizing a high-speed camera system and an image processing method, the researchers were able to record and quantify the liquid flow and distribution in the reactor. The combination of qualitative information from liquid distribution images and quantitative information from particle surface wetting efficiency allowed for a detailed evaluation of liquid dispersion in the trickle bed reactor.
Article
Energy & Fuels
Ahmed Z. Mazen, Nejat Rahmanian, Iqbal M. Mujtaba, Ali Hassanpour
Summary: The paper introduces a new simple model to predict PDC cutter wear and validates it using actual data. This model measures cutting efficiency based on different parameters, improving the understanding of how the drilling variables influence bit performance in the inner and outer cones.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Amer T. Nawaf, Hussein H. Hamed, Shymaa Ali Hameed, Aysar T. Jarullah, Layth T. Abdulateef, Iqbal M. Mujtaba
Summary: Several new homemade nano-catalysts were prepared to reduce sulfur compounds in light gas oil using adsorption desulfurization technique. The performance of these catalysts was evaluated through oxidative desulfurization process, showing removal efficiencies of 93.4%, 85.6%, and 62.1% for different catalysts under specific conditions. The study also investigated the best kinetic model and half-life period for the nano-catalysts involved in the relevant reactions.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Thabang W. Selalame, Raj Patel, Iqbal M. Mujtaba, Yakubu M. John
Summary: This paper explores the importance of accurate and reliable models in predicting greenhouse gas emissions from Fluid Catalytic Cracking (FCC) regenerators. The FCC unit is a significant contributor to global emissions, and recent efforts in climate change mitigation have highlighted the need for improved models to optimize operations and reduce costs. The paper reviews traditional modeling methodologies and discusses the hydrodynamics, kinetics, and constitutive parts of the regenerator. It concludes with suggestions for improving current models and providing a framework for future research.
Article
Energy & Fuels
Thabang W. Selalame, Raj Patel, Iqbal M. Mujtaba, Yakubu M. John
Summary: Heavy petroleum industries, including the fluid catalytic cracking (FCC) unit, are major contributors to global greenhouse gas emissions. Recent global efforts to mitigate climate change have led to increased legislation that affects the operations and future of these industries. This article reviews traditional modelling methodologies used in the FCC unit, focusing on the hydrodynamics, kinetics, and other factors that affect the riser and regenerator systems. The article highlights the need for accurate and reliable models to optimize the unit's performance under new regulations and predict greenhouse gas emissions.
Article
Biochemistry & Molecular Biology
Alanood A. Alsarayreh, Mudhar A. Al-Obaidi, Alejandro Ruiz-Garcia, Raj Patel, Iqbal M. Mujtaba
Summary: This paper investigates the energy dissipation and thermodynamic limitations of the RO system of the Arab Potash Company. By using RO and exergy analysis models, the distribution of energy dissipation is explored, revealing that the highest dissipation occurs in the product stream, while the lowest dissipation occurs in the mixing location of the first pass of the RO desalination system.
Article
Engineering, Chemical
Aysar T. Jarullah, Mustafa A. Ahmed, Ban A. Al-Tabbakh, Iqbal M. Mujtaba
Summary: In this study, a novel nanocatalyst based on iron oxide was developed for efficient removal of sulfur compounds from fuel. The catalyst showed high activity in oxidative desulfurization under moderate operating conditions. The optimal kinetic parameters of the ODS process were determined based on experimental data and model calculations. The reactor model was used to determine the optimal operating conditions, achieving a high removal of sulfur compounds.
CHEMICAL PRODUCT AND PROCESS MODELING
(2023)
Review
Energy & Fuels
Mudhar A. Al-Obaidi, Rana H. A. Zubo, Farhan Lafta Rashid, Hassan J. Dakkama, Raed Abd-Alhameed, Iqbal M. Mujtaba
Summary: This study evaluates the current status and economic feasibility of solar energy systems in seawater desalination processes. It finds that although solar energy systems have the potential to significantly reduce carbon footprint, the cost of water production is still high. Therefore, further research and development of solar energy systems or the implementation of carbon taxes on fossil fuels are necessary.
Article
Engineering, Chemical
Hridoy Roy, Sujoy Barua, Tasnim Ahmed, Fareen Mehnaz, Md Shahinoor Islam, Iqbal M. Mujtaba
Summary: The article evaluates the global chlor-alkali industry and discusses the prospects for Bangladesh. It highlights the lack of systematic utilization of by-products, chlorine and hydrogen, which threatens the sustainability of the industry. The article proposes feasible solutions, such as utilizing residual chlorine for new production, producing other chemicals from vented hydrogen, and using hydrogen as fuel. For the long-term growth of the chlor-alkali industry in Bangladesh and other developing countries, systematic utilization of chlorine and hydrogen is the only feasible solution.
Article
Energy & Fuels
Thabang W. Selalame, Raj Patel, Iqbal Mohammed Mujtaba, Yakubu Mandafiya John
Summary: This study presents a one-dimensional steady-state model of the FCC riser that considers the vaporisation of gas oil feed and subsequent cracking reactions. Three different models were used to study the evaporation of droplets. The model was validated against plant data and showed good performance in terms of gas oil conversion, gasoline yield, pressure drop, and temperature profiles. The findings suggest that vaporisation models are largely insignificant for typical operation conditions of FCC risers, unless the initial droplet size exceeds 2000 μm.
Article
Energy & Fuels
Hamin Jafaar Mohammed, Aysar T. Jarullah, Ban A. Al-Tabbakh, Hala M. Hussein
Summary: This research thoroughly investigated the oxidative desulfurization of kerosene with a sulfur concentration of 1158 ppm using two types of synthesized nanocatalysts (CuO/SiO2, CuO/TiO2-SiO2). Various characterization tests revealed that the catalysts had a strong metal-support interaction, good dispersion of the active metal (Cu), and a wide range of surface morphologies. The synthesized nano-catalysts showed significant sulfur removal efficiency, with CAT-1 achieving 87% and CAT-2 achieving 99.2% sulfur conversion at 413K for 100 min.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Engineering, Chemical
Amer T. Nawaf, Jasim I. Humadi, Aysar T. Jarullah, Mustafa A. Ahmed, Shymaa Ali Hameed, Iqbal M. Mujtaba
Summary: The removal of phenol and phenolic compounds from wastewater has been a topic of interest in recent years. This study investigated the catalytic oxidation of phenol using H2O2 as the oxidant. A new nano-catalyst (8% Fe2O3/AC) was designed by loading iron oxide nanoparticles onto nano-activated carbon. The highest efficiency of phenol removal was achieved under specific parameters, and the optimization technique successfully predicted the conversion of phenol.
Article
Biochemistry & Molecular Biology
Alejandro Ruiz-Garcia, Mudhar A. Al-Obaidi, Ignacio Nuez, Iqbal M. Mujtaba
Summary: Due to global water stress, desalination technologies are becoming increasingly important. Reverse osmosis (RO) is the most popular technology due to its reliability and efficiency. However, membrane fouling in RO systems can cause a decrease in water permeability coefficient (A) and impact system performance. This study analyzed the impact of A and the position of the spiral wound membrane modules (SWMMs) on RO system performance. The results showed that the SWMM in the first position had a more significant impact on system performance compared to modules in other positions.
Article
Physics, Fluids & Plasmas
Joseph T. Wallwork, Jaan H. Pu, Snehasis Kundu, Prashanth R. Hanmaiahgari, Manish Pandey, Alfrendo Satyanaga, Md. Amir Khan, Alastair Wood
Summary: This paper reviews existing studies on the assessment of sediment concentration profiles in different flow conditions. It considers various factors such as sediment particle size, flow depth, velocity, eddy viscosity, and Rouse number. The review also discusses the minimum threshold velocity required to increase sediment concentration and the bursting effect. The complexity of suspended sediment transport modeling is further evidenced by the consideration of multiple variables in assessing suspended sediment characteristics within flow.
Article
Engineering, Chemical
Aysar T. Jarullah, Sarmad K. Muhammed, Ban A. Al-Tabbakh, Iqbal M. Mujtaba
Summary: This study investigates the oxidative desulfurization of light gas oil using a copper and nickel oxide based composite nano-catalyst. The optimal operating conditions are achieved through model-based optimization techniques and high conversion rates are obtained. The process effectively removes over 99% of sulfur from the LGO, producing a cleaner fuel.
CHEMICAL PRODUCT AND PROCESS MODELING
(2022)
