Article
Engineering, Environmental
Chun-Kai Gong, Xiao Xu, Qiang Yang
Summary: This study systematically investigated the gas holdup and superficial gas velocity in a lab-scale bubble column. The experimental results showed that a dynamic equilibrium region was achieved at a distance of 2800 mm above the bubble generator. Small initial bubble size led to higher gas holdup and slump trend. By controlling the liquid mass flow in the nozzle, a reasonable gas holdup without slump could be achieved. A semi empirical correlation of gas holdup was established based on previous empirical correlations and experiment data, which provided accurate predictions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Xiao Xu, Chunkai Gong, Shuo Wang, Qiang Yang, Zhenhao Xi
Summary: Experiments and simulations were conducted to investigate the bubble size, gas holdup, and interfacial area in a swirling contactor divided into twelve subregions. The relationship between Reynolds numbers and bubble properties was analyzed. Swirling flows were found to be effective in enhancing gas-liquid mass transfer.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Rasoul Panjipour, Mohammad Karamoozian, Boris Albijanic
Summary: This paper discusses the relationships between bubble size distributions, gas holdups, interfacial area of bubbles and flotation kinetics by changing four factors: air velocity, solid percentage, frother dosage, and particle size. The results demonstrate that the solid percentage particularly affects gas holdups, which are directly proportional to the interfacial areas of bubbles. The knowledge about bubble size distributions and gas holdups are required to explain the flotation kinetics at different flotation conditions.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Nirvik Sen, Debmalya Mukherjee, Krishna Kumar Singh, Shilpi Saha, Anuradha Mayya, Kalsanka Trivikram Shenoy
Summary: A vortex reactor is an important equipment in the chemical processing industry for mixing reactants through the generation of a vortex. In this work, a novel technique using ultrasonic measurements is proposed to estimate the mixing time in a vortex reactor. The dynamic variation of sound velocity in the liquid is analyzed to determine the mixing time and dynamics.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Abdallah Haydar, Walid Blel, Helene Marec, Caroline Gentric
Summary: This study investigates the influence of confinement and rheological properties of the liquid phase on gas holdup and flow regimes in a 2 mm gap bubble column intended for high cell concentration photobioreactors. The results indicate that gas holdup is higher for viscous or non-Newtonian fluids compared to water, and also higher in a thin-gap column compared to an unconfined one. The behavior is further enhanced with increasing confinement ratio. Regime transitions occur at lower superficial gas velocity for non-Newtonian fluids and thin-gap columns. This study provides valuable information for optimizing the operation of microalgae cultures.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Mojtaba Mokhtari, Jamal Chaouki
Summary: The complexities in the hydrodynamics of slurry bubble columns create uncertainty in reactor design and scale-up. Understanding local hydrodynamics can help alleviate this issue. The effect of solids properties on the local hydrodynamic parameters is a critical subject of study, with experiments showing non-uniform distribution of solid particles and gas holdup in the column.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Weiling Li, Genfu Zhou, Jian Sun, Yafei Guo, Ruilin Wang
Summary: The study investigated the effects of solid volume fraction and particle size on gas holdups in gas-liquid-solid bubble columns under different flow regimes. Results showed that gas holdup decreased with higher solid volume fraction in certain flow regimes, while the change in solid volume fraction or particle size had a minor impact in the strong turbulent regime. A new correlation for gas holdup was developed considering particle properties and flow regimes.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Energy & Fuels
Aloisio E. Orlando Jr, Luiz F. Barca, Theodore J. Heindel, Tania S. Klein, Ricardo A. Medronho
Summary: This study evaluates the impact of EOR chemicals on gas holdup, finding that both salt and surfactants increase gas holdup, while the effect of polymers depends on superficial gas velocity.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Martina Piccioli, Robert Andre Gjelsten Larsen, Marcin Dudek, Svein Viggo Aanesen, Gisle oye
Summary: Produced water is a significant waste stream in petroleum production, and its treatment is a major issue in the oil industry. Gas flotation has proven effective for topside separation and is now being pursued for subsea produced water treatment. This study investigated the impact of pressure and temperature on gas flotation, finding that higher temperatures and pressures improved oil removal efficiency. The enhanced separation was attributed to improved coalescence and creaming, as well as an increased area for drop-bubble attachments. A first-order kinetic model successfully described the gas flotation process.
Article
Energy & Fuels
Martina Piccioli, Robert Andre Gjelsten Larsen, Marcin Dudek, Svein Viggo Aanesen, Gisle Oye
Summary: Produced water is a significant waste stream in petroleum production, and its treatment poses challenges for the oil industry. Gas flotation technology has been proven effective for topside separation and is being considered for subsea produced water treatment. This study investigated the effects of pressure and temperature on oil removal efficiency using a gas flotation rig. Gas flotation experiments were conducted at elevated pressures and temperatures, and gravity separation experiments served as a reference. The findings showed that high temperature and pressure yielded the best oil removal results, with temperature having the most significant impact due to improved coalescence and reduced water viscosity, while pressure increased the available area for drop-bubble attachments.
Article
Engineering, Chemical
Meljin Madavana Paul, Leila Pakzad
Summary: The hydrodynamics of air bubble rise in shear-thinning non-Newtonian liquids in bubble columns were investigated through computational fluid dynamics (CFD). The study found that the bubble size distribution and gas holdup significantly impact mass transfer rates and reactor design. Various factors affecting gas velocity, flow index, consistency index, sparger bubble size, and yield stress were analyzed on both local and global scales.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Mechanics
Hengwei Zhang, Yao Xiao, Hanyang Gu
Summary: This study developed new methods for estimating interface area concentration (IAC) and bubble size distribution (BSD) independently of superficial liquid velocity. The methods use control volumes and tomography measurement data to calculate instantaneous parameters, improving upon previous methods which were not satisfactory under certain flow conditions.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Engineering, Chemical
Yucheng Fu, Jie Bao, Rajesh Kumar Singh, Richard Feng Zheng, Christine M. Anderson-Cook, K. Sham Bhat, Zhijie Xu
Summary: Carbon dioxide capture through solvent absorption in packed columns has shown potential for mitigating CO2 emissions from coal-fired power plants. Parameters such as packing types, solvent properties, and operating conditions can influence the efficiency of CO2 capture in packed columns. By using a design of experiments method and multiphase computational fluid dynamics, the impact of random packed column parameters on liquid holdup and interfacial area can be efficiently investigated. Sensitivity analysis indicates that the solvent flow rate and contact angle are key factors affecting liquid holdup and interfacial area, while solvent viscosity has minimal impact on interfacial area. The sensitivity scores for each input parameter can guide the selection of dimensionless numbers for developing correlations of liquid holdup and interfacial area.
Article
Engineering, Chemical
Neha Agarwal, Moonyong Lee, Hyunsung Kim
Summary: Bubble size and its distribution directly impact mass transfer in bubble column reactors. This study introduces a new image processing technique to investigate hydrodynamic aspects and bubble behavior in real chemical or biochemical processes, overcoming the challenge of identifying overlapping or cluster bubbles.
Article
Engineering, Environmental
Quan Liu, Jingchang Zhang, Xiaoping Guan, Ning Yang
Summary: A simplified correlative model was developed to consider the surfactant effect on the average drag coefficient in CFD simulation of two-phase flow. This model can improve gas holdup prediction in the homogeneous regime and reasonably estimate gas holdup in the heterogeneous regime by considering both surfactant effect and swarm effect. The model reproduces the peak of gas holdup at a certain surfactant concentration.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Victor Alfonsin, Andres Suarez, Rocio Maceiras, Angel Sanchez
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2018)
Article
Environmental Sciences
Rocio Maceiras, Victor Alfonsin, Javier Martinez, Carlos Martinez Vara de Rey
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH
(2018)
Article
Environmental Sciences
Jose Luis Salgueiro, Leticia Perez, Rocio Maceiras, Angel Sanchez, Angeles Cancela
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH
(2018)
Article
Thermodynamics
Ignacio Ortega, Jaime Sieres, Fernando Cerdeira, Estrella Alvarez, Juan Rodriguez
INTERNATIONAL JOURNAL OF REFRIGERATION
(2019)
Article
Green & Sustainable Science & Technology
A. Cancela, L. Perez, A. Febrero, A. Sanchez, J. L. Salgueiro, L. Ortiz
Article
Agricultural Engineering
Aloia Romani, Antonio Larramendi, Remedios Yanez, Angeles Cancela, Angel Sanchez, Jose A. Teixeira, Lucilia Domingues
INDUSTRIAL CROPS AND PRODUCTS
(2019)
Article
Thermodynamics
Jaime Sieres, Ignacio Ortega, Fernando Cerdeira, Estrella Alvarez
INTERNATIONAL JOURNAL OF REFRIGERATION
(2020)
Article
Plant Sciences
Xana Alvarez, Angeles Cancela, Vanesa Freitas, Enrique Valero, Angel Sanchez, Carolina Acuna-Alonso
Article
Thermodynamics
F. J. Tamajon, Fernando Cerdeira, Estrella Alvarez
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2020)
Article
Thermodynamics
Jaime Sieres, Ignacio Ortega, Fernando Cerdeira, Estrella Alvarez
Summary: This study investigates the performance of refrigerants R452B and R454B as drop-in replacements for R410A in a heat pump system, finding that the lower-GWP alternatives offer advantages in terms of higher discharge temperatures, lower heating and compression powers compared to R410A.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Estrella Alvarez, Fernando Cerdeira, Jose Manuel Navaza, Francisco Javier Tamajon
Summary: The experiment measured the surface tension of N-methyldiethanolamine in different solvent mixtures, and correlated the data with temperature and concentration using various models. The research investigated the effects of temperature and concentration on surface tension.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Energy & Fuels
Rocio Maceiras, Victor Alfonsin, Luis Segui, Juan F. Gonzalez
Summary: The study demonstrates that microwave assisted alkaline pretreatment significantly improves the production efficiency of cellulosic bioethanol from algae waste, especially by enhancing fermentation efficiency and reducing energy consumption. The selection of microwave power and irradiation time has a significant impact on the effectiveness of the pretreatment.
Article
Chemistry, Multidisciplinary
Xana Alvarez, Angeles Cancela, Yolanda Merchan, Angel Sanchez
Summary: A study was conducted on the leaves of six Eucalyptus species using different extraction methods and investigating the impact of solvent polarity on extraction yields. The results demonstrated the significant potential of E. nitens in terms of compound content, with substantially higher yields compared to other species.
APPLIED SCIENCES-BASEL
(2021)
Article
Green & Sustainable Science & Technology
Jaime Sieres, Ignacio Ortega, Fernando Cerdeira, Estrella Alvarez, Jose M. Santos
Summary: This study focuses on the seasonal coefficient of performance (SCOP) of a domestic brine-to-water heat pump for low-temperature applications, and explains and evaluates the methodology according to the European standard EN 14825. The results show that the SCOP can be improved by 26% with the use of certain technology options.
CLEAN TECHNOLOGIES
(2022)
Article
Agricultural Engineering
Leticia Perez, Jose Luis Salgueiro, Rocio Maceiras, Angeles Cancela, Angel Sanchez
BIOMASS & BIOENERGY
(2017)
Article
Engineering, Environmental
Xinping Zhang, Yuxin Guo, Xiaoyang Liu, Shun-Yu Wu, Ya-Xuan Zhu, Shao-Zhe Wang, Qiu-Yi Duan, Ke-Fei Xu, Zi-Heng Li, Xiao-Yu Zhu, Guang-Yu Pan, Fu-Gen Wu
Summary: This study develops a nanotrigger HCFT for simultaneous photodynamic therapy and light-triggered ferroptosis therapy. The nanotrigger can relieve tumor hypoxia, induce enhanced photodynamic reaction, and facilitate the continuation of Fenton reaction, ultimately leading to lethal ferroptosis in tumor cells.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Olumide Bolarinwa Ayodele, Toyin Daniel Shittu, Olayinka S. Togunwa, Dan Yu, Zhen-Yu Tian
Summary: This study focused on the semihydrogenation of acetylene in an ethylene-rich stream using two alloyed Pt catalysts PtCu and PtCo. The PtCu catalyst showed higher activity and ethylene yield compared to PtCo due to its higher unoccupied Pt d-orbital density. This indicates that alloying Pt with Cu is more promising for industrial relevant SHA catalyst.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Guowei Chen, Wen-Cheng Chen, Yaozu Su, Ruicheng Wang, Jia-Ming Jin, Hui Liang, Bingxue Tan, Dehua Hu, Shaomin Ji, Hao-Li Zhang, Yanping Huo, Yuguang Ma
Summary: This study proposes an intramolecular dual-locking design for organic luminescent materials, achieving high luminescence efficiency and performance for deep-blue organic light-emitting diodes. The material also exhibits unique mechanochromic luminescence behavior and strong fatigue resistance.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Joren van Stee, Gregory Hermans, Jinu Joseph John, Koen Binnemans, Tom Van Gerven
Summary: This work presents a continuous solvent extraction method for the separation of cobalt and nickel in a millifluidic system using Cyphos IL 101 (C101) as the extractant. The optimal conditions for extraction performance and solvent properties were determined by investigating the effects of channel length, flow rate, and temperature. The performance of a developed manifold structure was compared to a single-channel system, and excellent separation results were achieved. The continuous separation process using the manifold structure resulted in high purity cobalt and nickel products.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Yan Xu, Jingai Jiang, Xinyi Lv, Hui Li, Dongliang Yang, Wenjun Wang, Yanling Hu, Longcai Liu, Xiaochen Dong, Yu Cai
Summary: A programmed gas release nanoparticle was developed to address the challenges in treating diabetic infected wounds. It effectively removes drug-resistant pathogens and remodels the wound microenvironment using NO and H2S. The nanoparticle can eliminate bacteria and promote wound healing through antibacterial and anti-inflammatory effects.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Tong Xia, Zhilin Xi, Lianquan Suo, Chen Wang
Summary: This study investigated a highly efficient coal dust suppressant with low initial viscosity and high adhesion-solidification properties. The results demonstrated that the dust suppressant formed a network of multiple hydrogen bonding cross-linking and achieved effective adhesion and solidification of coal dust through various chemical reactions.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Jinzhi Cai, Zhenshan Li
Summary: A density functional theory-based rate equation was developed to predict the gas-solid reaction kinetics of CaO carbonation with CO2 in calcium looping. The negative activation energy of CaO carbonation close to equilibrium was accurately predicted through experimental validation.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Jianxiong Chen, Fuhao Ren, Ningning Yin, Jie Mao
Summary: This study presents an economically efficient and easily implementable surface modification approach to enhance the high-temperature electrical insulation and energy storage performance of polymer dielectrics. The self-assembly of high-insulation-performance boron nitride nanosheets (BNNS) on the film surface through electrostatic interactions effectively impedes charge injection from electrodes while promoting charge dissipation and heat transfer.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Zijian Li, Zhaohui Yang, Shao Wang, Hongxia Luo, Zhimin Xue, Zhenghui Liu, Tiancheng Mu
Summary: This study reports a strategy for upgrading polyester plastics into value-added chemicals using electrocatalytic methods. By inducing the targeted transfer of *OH species, polyethylene terephthalate was successfully upgraded into potassium diformate with high purity. This work not only develops an excellent electrocatalyst, but also provides guidance for the design of medium entropy metal oxides.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Navneet Singh Shekhawat, Surendra Kumar Patra, Ashok Kumar Patra, Bamaprasad Bag
Summary: This study primarily focuses on developing a sulphur dyeing process at room temperature using bacterial Lysate, which is environmentally friendly, energy and cost effective, and sustainable. The process shows promising improvements in dye uptake and fastness properties.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Dengjia Shen, Hongyang Ma, Madani Khan, Benjamin S. Hsiao
Summary: This study developed cationic PVC nanofibrous membranes with high filtration and adsorption capability for the removal of bacteria and hexavalent chromium ions from wastewater. The membranes demonstrated remarkable performance in terms of filtration efficiency and maximum adsorption capacity. Additionally, modified nanofibrous membranes were produced using recycled materials and showed excellent retention rates in dynamic adsorption processes.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Xiaoyan Wang, Zhikun Wang, Ben Jia, Chunling Li, Shuangqing Sun, Songqing Hu
Summary: Inspired by photosystem II, self-supported Fe-doped NiCoP nanowire arrays modified with carboxylate were constructed to boost industrial-level overall water splitting by employing the concerted proton-coupled electron transfer mechanism. The introduction of Fe and carboxyl ligand led to improved catalytic activity for HER and OER, and NCFCP@NF exhibited long-term durability for overall water splitting.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Pengyao Yu, Ge Yang, Yongming Chai, Lubomira Tosheva, Chunzheng Wang, Heqing Jiang, Chenguang Liu, Hailing Guo
Summary: Thin LTA zeolite membranes were prepared through secondary growth of nano LTA seeds in a highly reactive gel, resulting in membranes with superior permeability and selectivity in gas separation applications.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Baiqin Zhou, Huiping Li, Ziyu Wang, Hui Huang, Yujun Wang, Ruichun Yang, Ranran Huo, Xiaoyan Xu, Ting Zhou, Xiaochen Dong
Summary: The use of machine learning to predict the performance of specific adsorbents in phosphate adsorption shows great promise in saving time and revealing underlying mechanisms. However, the small size of the dataset and insufficient detailed information limits the model training process and the accuracy of results. To address this, the study employs a fuzzing strategy that replaces detailed numeric information with descriptive text messages on the physiochemical properties of adsorbents. This strategy allows the recovery of discarded samples with limited information, leading to accurate prediction of adsorption amount, capacity, and kinetics. The study also finds that phosphate uptake by adsorbents is generally through physisorption, with some involvement of chemisorption. The framework established in this study provides a practical approach for quickly predicting phosphate adsorption performance in urgent scenarios, using easily accessible information.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Engineering, Environmental
Paula Alejandra Lamprea Pineda, Joren Bruneel, Kristof Demeestere, Lisa Deraedt, Tex Goetschalckx, Herman Van Langenhove, Christophe Walgraeve
Summary: This study evaluates the use of four esterified fatty acids and three vegetable oils as absorption liquids for hydrophobic VOCs. The experimental results show that isopropyl myristate is the most efficient liquid for absorbing the target VOCs.
CHEMICAL ENGINEERING JOURNAL
(2024)