Chemical Engineering and Processing - Process Intensification最新文献

英文中文

Intensification of electrocoagulation treatment of simulated tannery wastewater using rotating electrodes: Parametric, isotherms, kinetic and techno-economic studies

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-11 DOI: 10.1016/j.cep.2024.110150

Rishi Kumar Verma, Sushil Kumar

This research work aims to intensify the electrocoagulation (EC) treatment of synthetic/simulated tannery wastewater using a reactor with a rotating anodes and cathode rings connected in a monopolar-parallel manner for the efficiently removal of COD and Cr (VI). In this study, important EC operational parameters including rotating anode speed [50–300 rpm], pH [2.0–12.0], electrolysis time [5–30 min] and current density [0.53–3.18 mA/cm²] are varied and their efficacy on EC treatment is evaluated. The maximum reduction of COD and Cr(VI) are obtained as 91 % and 95 %, respectively, with the optimized conditions as speed = 100 rpm, pH = 6, time = 20 min and current density = 2.65 mA/cm². Isotherms and Kinetics studies for both the COD and Cr(VI) removal are also performed and to analyse the best fit kinetics (pseudo second-order with R² = 0.97 and the intra-particle diffusion with R² = 0.99, respectively) and isotherm models (Sips with R² = 0.99 and Freundlich with R² = 0.98, respectively) along with appropriate model parameters. Lastly, the electrical energy consumption (EEC = 1.77 kWh/m³), electrode consumption (ELC = 0.075 kg/m³), stirrer energy consumption (SEC = 0.043 kWh/m³) and operating cost (OC = 0.36 US $/m³) under optimal conditions are calculated.

{"title":"Intensification of electrocoagulation treatment of simulated tannery wastewater using rotating electrodes: Parametric, isotherms, kinetic and techno-economic studies","authors":"Rishi Kumar Verma, Sushil Kumar","doi":"10.1016/j.cep.2024.110150","DOIUrl":"10.1016/j.cep.2024.110150","url":null,"abstract":"<div><div>This research work aims to intensify the electrocoagulation (EC) treatment of synthetic/simulated tannery wastewater using a reactor with a rotating anodes and cathode rings connected in a monopolar-parallel manner for the efficiently removal of COD and Cr (VI). In this study, important EC operational parameters including rotating anode speed [50–300 rpm], pH [2.0–12.0], electrolysis time [5–30 min] and current density [0.53–3.18 mA/cm<sup>2</sup>] are varied and their efficacy on EC treatment is evaluated. The maximum reduction of COD and Cr(VI) are obtained as 91 % and 95 %, respectively, with the optimized conditions as speed = 100 rpm, pH = 6, time = 20 min and current density = 2.65 mA/cm<sup>2</sup>. Isotherms and Kinetics studies for both the COD and Cr(VI) removal are also performed and to analyse the best fit kinetics (pseudo second-order with R<sup>2</sup> = 0.97 and the intra-particle diffusion with R<sup>2</sup> = 0.99, respectively) and isotherm models (Sips with R<sup>2</sup> = 0.99 and Freundlich with R<sup>2</sup> = 0.98, respectively) along with appropriate model parameters. Lastly, the electrical energy consumption (EEC = 1.77 kWh/m<sup>3</sup>), electrode consumption (ELC = 0.075 kg/m<sup>3</sup>), stirrer energy consumption (SEC = 0.043 kWh/m<sup>3</sup>) and operating cost (OC = 0.36 US $/m<sup>3</sup>) under optimal conditions are calculated.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110150"},"PeriodicalIF":3.8,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intensification of the adsorption process to remove Iopamidol from water using granular activated carbon: Use of Rotating Packed Reactor and ultrasound technique in continuous flow technology

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-11 DOI: 10.1016/j.cep.2025.110166

Rosanna Paparo , Marco Trifuoggi , Fulvio Uggeri , Luigi Nicolais , Vincenzo Russo , Martino Di Serio

Conventional wastewater treatment methods are ineffective at degrading Iopamidol (IPM), allowing this pharmaceutical compound to penetrate aquatic systems, raising concerns about potential ecological impacts. Adsorption using granular activated carbon (GAC) represents an effective technique for IPM removal from water. This study focuses on the development of innovative technological approaches for the effective removal of IPM using Rotating Packed Beds (RPBs) and ultrasound enhancement techniques. These methods not only promise improved efficiency in pollutant removal but are also applicable on an industrial scale, making them significant advancements in wastewater treatment technologies. RPB system is investigated to replace the common impeller in batch system using the centrifugal acceleration to intensify the mass transfer processes. At the same time, the application of ultrasounds in a continuous flow system can result in process intensification increasing the productivity with lower impact on the environment and this dynamic system enables an evaluation of the adsorbent saturation in relation to the space, time and length of the adsorption column. In this paper the intensification of IPM adsorption was performed using the RPB and a continuous flow system in presence of ultrasounds, an improvement of the conventional adsorption process of 13 % and 64 % respectively was shown.

{"title":"Intensification of the adsorption process to remove Iopamidol from water using granular activated carbon: Use of Rotating Packed Reactor and ultrasound technique in continuous flow technology","authors":"Rosanna Paparo , Marco Trifuoggi , Fulvio Uggeri , Luigi Nicolais , Vincenzo Russo , Martino Di Serio","doi":"10.1016/j.cep.2025.110166","DOIUrl":"10.1016/j.cep.2025.110166","url":null,"abstract":"<div><div>Conventional wastewater treatment methods are ineffective at degrading Iopamidol (IPM), allowing this pharmaceutical compound to penetrate aquatic systems, raising concerns about potential ecological impacts. Adsorption using granular activated carbon (GAC) represents an effective technique for IPM removal from water. This study focuses on the development of innovative technological approaches for the effective removal of IPM using Rotating Packed Beds (RPBs) and ultrasound enhancement techniques. These methods not only promise improved efficiency in pollutant removal but are also applicable on an industrial scale, making them significant advancements in wastewater treatment technologies. RPB system is investigated to replace the common impeller in batch system using the centrifugal acceleration to intensify the mass transfer processes. At the same time, the application of ultrasounds in a continuous flow system can result in process intensification increasing the productivity with lower impact on the environment and this dynamic system enables an evaluation of the adsorbent saturation in relation to the space, time and length of the adsorption column. In this paper the intensification of IPM adsorption was performed using the RPB and a continuous flow system in presence of ultrasounds, an improvement of the conventional adsorption process of 13 % and 64 % respectively was shown.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110166"},"PeriodicalIF":3.8,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RPB simulation predictive model and optimization analysis

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-10 DOI: 10.1016/j.cep.2025.110164

Xu Dongliang , Zhao Binbin , Sun Yimei , Chen Minggong

The rotating packed bed (RPB) has significant potential for improving reaction rates and mass transfer efficiency, but its complex flow dynamics remain incompletely understood. This study presents experimental data on the dry pressure drop at various rotor speeds and gas flow rates, providing a basis for theoretical model development. Computational fluid dynamics (CFD) was used for modelling and analysis, with lattice independence verified by a logistic regression model. A modified porous media model was used to analyze the gas phase flow within the RPB chamber. The corrected predictive model showed an average deviation of 4.71 % from the experimental dry pressure drop data. Further structural optimization analysis showed that using a composite inverse rotor (CIR) significantly increased the average turbulent kinetic energy. In addition, the relationship between turbulent kinetic energy and pressure drop was investigated by varying the position coefficients. The results provide significant theoretical insights for optimizing RPB structure and improving mass transfer efficiency in industrial applications.

{"title":"RPB simulation predictive model and optimization analysis","authors":"Xu Dongliang , Zhao Binbin , Sun Yimei , Chen Minggong","doi":"10.1016/j.cep.2025.110164","DOIUrl":"10.1016/j.cep.2025.110164","url":null,"abstract":"<div><div>The rotating packed bed (RPB) has significant potential for improving reaction rates and mass transfer efficiency, but its complex flow dynamics remain incompletely understood. This study presents experimental data on the dry pressure drop at various rotor speeds and gas flow rates, providing a basis for theoretical model development. Computational fluid dynamics (CFD) was used for modelling and analysis, with lattice independence verified by a logistic regression model. A modified porous media model was used to analyze the gas phase flow within the RPB chamber. The corrected predictive model showed an average deviation of 4.71 % from the experimental dry pressure drop data. Further structural optimization analysis showed that using a composite inverse rotor (CIR) significantly increased the average turbulent kinetic energy. In addition, the relationship between turbulent kinetic energy and pressure drop was investigated by varying the position coefficients. The results provide significant theoretical insights for optimizing RPB structure and improving mass transfer efficiency in industrial applications.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110164"},"PeriodicalIF":3.8,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrating 3D printed microreactors and microseparators for efficient biodiesel production

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-10 DOI: 10.1016/j.cep.2025.110165

Ivan Karlo Cingesar, Marijan-Pere Marković, Domagoj Vrsaljko

The growing demand for alternative energy sources to combat climate change has positioned biodiesel as a viable solution. Derived from vegetable oils, fatty acids, animal fats, or algae, biodiesel offers a renewable alternative to conventional diesel with reduced greenhouse gas emissions. This study investigates the use of 3D printed microreactors for biodiesel synthesis, emphasizing the benefits of microreactors such as efficient mixing, enhanced heat transfer, and precise reaction control. Five microreactor configurations with static mixers were analyzed for their effectiveness in biodiesel production through transesterification. Additionally, 3D printed microseparators were integrated into the system to streamline the separation process. The results show that microreactors, especially those with complex geometries made possible by 3D printing, significantly improve reaction yields and reduce waste compared to traditional batch reactors. The most effective system was the T10E microreactor, achieving a 96.1% yield in 9.6 min, paired with the MSv5 microseparator, which resulted in a biodiesel separation factor of 54.9%. This research demonstrates the potential of 3D printed microreactors and microseparators to advance sustainable biodiesel production and offers a promising approach for scalable and cost-effective biofuel synthesis.

{"title":"Integrating 3D printed microreactors and microseparators for efficient biodiesel production","authors":"Ivan Karlo Cingesar, Marijan-Pere Marković, Domagoj Vrsaljko","doi":"10.1016/j.cep.2025.110165","DOIUrl":"10.1016/j.cep.2025.110165","url":null,"abstract":"<div><div>The growing demand for alternative energy sources to combat climate change has positioned biodiesel as a viable solution. Derived from vegetable oils, fatty acids, animal fats, or algae, biodiesel offers a renewable alternative to conventional diesel with reduced greenhouse gas emissions. This study investigates the use of 3D printed microreactors for biodiesel synthesis, emphasizing the benefits of microreactors such as efficient mixing, enhanced heat transfer, and precise reaction control. Five microreactor configurations with static mixers were analyzed for their effectiveness in biodiesel production through transesterification. Additionally, 3D printed microseparators were integrated into the system to streamline the separation process. The results show that microreactors, especially those with complex geometries made possible by 3D printing, significantly improve reaction yields and reduce waste compared to traditional batch reactors. The most effective system was the T10E microreactor, achieving a 96.1% yield in 9.6 min, paired with the MSv5 microseparator, which resulted in a biodiesel separation factor of 54.9%. This research demonstrates the potential of 3D printed microreactors and microseparators to advance sustainable biodiesel production and offers a promising approach for scalable and cost-effective biofuel synthesis.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110165"},"PeriodicalIF":3.8,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probe into methanol and ethanol mixtures oxidative reforming in gliding arc discharge plasma and kinetic model

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-09 DOI: 10.1016/j.cep.2025.110162

Baowei Wang, Lijun Xu, Shize Liu, Jijun Zou

A plasma reactor utilizing gliding arc discharge (GAD) was created for the purpose of partial oxidative reforming (POR) a mixture of methanol and ethanol to produce H₂. This study explored that the molar ratio of oxygen to carbon (O/C), the mass ratio of methanol to ethanol, residence time, and input power influenced the POR reaction. With an O/C ratio of 0.5, a methanol-to-ethanol mass ratio of 1:1, an input power of 42 W, and a residence time of 30 s, the energy yield for H₂ reached 84.6 L

\cdot

kWh⁻¹, with H₂ and CO as the main products. Optical Emission Spectroscopy (OES) was employed to diagnose GAD plasma. A zero-dimensional (0-D) kinetic model was developed, showing good agreement with experimental data. The conversion mechanisms for methanol and ethanol, along with the generation and consumption of products, were thoroughly analyzed. The conversion of methanol and ethanol occurs mainly through H-atom collisions. The main pathway for H₂ production originates from the recombination reactions of H· radicals with hydrocarbons such as CH₂·, CH₄, C₂H₃·, and C₂H₆.

{"title":"Probe into methanol and ethanol mixtures oxidative reforming in gliding arc discharge plasma and kinetic model","authors":"Baowei Wang, Lijun Xu, Shize Liu, Jijun Zou","doi":"10.1016/j.cep.2025.110162","DOIUrl":"10.1016/j.cep.2025.110162","url":null,"abstract":"<div><div>A plasma reactor utilizing gliding arc discharge (GAD) was created for the purpose of partial oxidative reforming (POR) a mixture of methanol and ethanol to produce H<sub>2</sub>. This study explored that the molar ratio of oxygen to carbon (O/C), the mass ratio of methanol to ethanol, residence time, and input power influenced the POR reaction. With an O/C ratio of 0.5, a methanol-to-ethanol mass ratio of 1:1, an input power of 42 W, and a residence time of 30 s, the energy yield for H<sub>2</sub> reached 84.6 L<span><math><mo>·</mo></math></span>kWh<sup>−1</sup>, with H<sub>2</sub> and CO as the main products. Optical Emission Spectroscopy (OES) was employed to diagnose GAD plasma. A zero-dimensional (0-D) kinetic model was developed, showing good agreement with experimental data. The conversion mechanisms for methanol and ethanol, along with the generation and consumption of products, were thoroughly analyzed. The conversion of methanol and ethanol occurs mainly through H-atom collisions. The main pathway for H<sub>2</sub> production originates from the recombination reactions of H· radicals with hydrocarbons such as CH<sub>2</sub>·, CH<sub>4</sub>, C<sub>2</sub>H<sub>3</sub>·, and C<sub>2</sub>H<sub>6</sub>.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110162"},"PeriodicalIF":3.8,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel method for reusing diatomaceous earth in the filtration process of aluminium cold rolling mill

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-07 DOI: 10.1016/j.cep.2025.110161

Daiany Cristiny Moreira Lemes, Raquel Aparecida Domingues, Danielle Maass

Diatomaceous earth (DE), a porous sedimentary rock, is a critical component in filtering lubricating oil during aluminum cold rolling. Its high porosity allows it to trap impurities in the oil, but frequent replacement due to a limited lifespan increases costs and waste generation. This study investigated the viability of replacing fresh DE with diatomaceous earth residue (RDE), the leftover material after filtering oil. Various tests were conducted using different raw DE and RDE proportions across different filter layers. Tests showed that a 50 % RDE mixture in certain filter layers extended filtration time while maintaining oil quality. Consequently, a 30 % reduction on both costs and RDE generation was achieved. These results represent a significant advancement in terms of material conservation, cost avoidance, and waste reduction, especially because no pretreatment was applied to the diatomaceous earth.

引用次数: 0

Highly efficient extraction of indium from zinc oxide dust by ultrasonic-enhanced leaching process

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-07 DOI: 10.1016/j.cep.2025.110158

Enpei Zhu , Chao Luo , Shengxuan Zhao , Hongying Xia , Jing Li , Linqing Dai , Likang Fu , Gengwei Zhang , Yonggang Zuo , Libo Zhang

Leaching is of great importance to extract indium in metallurgy. However, contemporary approaches for leaching indium, which enable indium dissolve into acid solution as ions, usually face challenges such as complex process, prolonged duration, harsh acidity, and poor efficiency. Herein, we present a novel approach for the highly efficient extraction of indium (In) from zinc oxide dust (ZOD) utilizing ultrasonic-enhanced two-stage leaching. The leaching efficiency of indium has reached 98.1 % under relatively mild acid (180 g/L) and very short period (120 min, nearly half time of other methods). That mainly attributed to the ultrasonic cavitation effect, which facilitates solute dispersion, enhances wetting, and promotes mass transfer across liquid-solid interface, thus synergistically reinforcing leaching process. Importantly, our strategy being compatible with traditional processes, offers a promising pathway for indium recovery featured by simplicity, high efficiency, and cost-effectiveness under ultrasonic conditions, which broadens the ultrasonic technology applications in metallurgy.

{"title":"Highly efficient extraction of indium from zinc oxide dust by ultrasonic-enhanced leaching process","authors":"Enpei Zhu , Chao Luo , Shengxuan Zhao , Hongying Xia , Jing Li , Linqing Dai , Likang Fu , Gengwei Zhang , Yonggang Zuo , Libo Zhang","doi":"10.1016/j.cep.2025.110158","DOIUrl":"10.1016/j.cep.2025.110158","url":null,"abstract":"<div><div>Leaching is of great importance to extract indium in metallurgy. However, contemporary approaches for leaching indium, which enable indium dissolve into acid solution as ions, usually face challenges such as complex process, prolonged duration, harsh acidity, and poor efficiency. Herein, we present a novel approach for the highly efficient extraction of indium (In) from zinc oxide dust (ZOD) utilizing ultrasonic-enhanced two-stage leaching. The leaching efficiency of indium has reached 98.1 % under relatively mild acid (180 g/L) and very short period (120 min, nearly half time of other methods). That mainly attributed to the ultrasonic cavitation effect, which facilitates solute dispersion, enhances wetting, and promotes mass transfer across liquid-solid interface, thus synergistically reinforcing leaching process. Importantly, our strategy being compatible with traditional processes, offers a promising pathway for indium recovery featured by simplicity, high efficiency, and cost-effectiveness under ultrasonic conditions, which broadens the ultrasonic technology applications in metallurgy.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110158"},"PeriodicalIF":3.8,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new approach for the elimination of Rhodamine B dye using a combination of activated persulfate and dithionite in the presence of magnetic fields

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-06 DOI: 10.1016/j.cep.2025.110160

Ahmad Rajabizadeh , Hossein Abdipour , Hossein Jafari Mansoorian

Considering the water shortage crisis, removing dye from textile wastewater is crucial to protect health and the environment. Recycling this water is vital for sustainable resource management. In the present study, the efficiency of degradation and mineralization of rhodamine B from textile industry wastewater using activated dithionite and persulfate with the aid of a magnetic field was investigated. Various parameters such as pH (3–10), Persulfate+ dithionite concentration (5–20 mg/L), magnetic field intensity (1–4 A), initial rhodamine B concentration (10–100 mg/L), and contact time (15–120 min) were evaluated on a laboratory scale. The optimal conditions were determined by the Taguchi model, which were pH=7, persulfate concentration of 20 mg/L, magnetic field intensity of 4 A, reaction time of 90 min, and initial rhodamine B concentration of 50 mg/L. The rhodamine B removal efficiency and TOC destruction efficiency were obtained as 15.90 % and 90 %, respectively. The kinetics of the process followed a pseudo-second-order model (R² = 0.9983). The results of this study show that increasing the magnetic field intensity resulted in a 36.6 % improvement in efficiency. The findings of this study are promising and justify the potential application of this process in the textile and dyeing industries. Therefore, economic feasibility and cost-benefit analysis are required, taking into account any limitations related to wastewater treatment.

{"title":"A new approach for the elimination of Rhodamine B dye using a combination of activated persulfate and dithionite in the presence of magnetic fields","authors":"Ahmad Rajabizadeh , Hossein Abdipour , Hossein Jafari Mansoorian","doi":"10.1016/j.cep.2025.110160","DOIUrl":"10.1016/j.cep.2025.110160","url":null,"abstract":"<div><div>Considering the water shortage crisis, removing dye from textile wastewater is crucial to protect health and the environment. Recycling this water is vital for sustainable resource management. In the present study, the efficiency of degradation and mineralization of rhodamine B from textile industry wastewater using activated dithionite and persulfate with the aid of a magnetic field was investigated. Various parameters such as pH (3–10), Persulfate+ dithionite concentration (5–20 mg/L), magnetic field intensity (1–4 A), initial rhodamine B concentration (10–100 mg/L), and contact time (15–120 min) were evaluated on a laboratory scale. The optimal conditions were determined by the Taguchi model, which were pH=7, persulfate concentration of 20 mg/L, magnetic field intensity of 4 A, reaction time of 90 min, and initial rhodamine B concentration of 50 mg/L. The rhodamine B removal efficiency and TOC destruction efficiency were obtained as 15.90 % and 90 %, respectively. The kinetics of the process followed a pseudo-second-order model (R² = 0.9983). The results of this study show that increasing the magnetic field intensity resulted in a 36.6 % improvement in efficiency. The findings of this study are promising and justify the potential application of this process in the textile and dyeing industries. Therefore, economic feasibility and cost-benefit analysis are required, taking into account any limitations related to wastewater treatment.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110160"},"PeriodicalIF":3.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Model analysis of mass transfer in liquid films in a Taylor flow reactor for gas-liquid-solid three-phase reactions

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-06 DOI: 10.1016/j.cep.2025.110151

Takuya Fukui , Masahiro Yasuda , Takafumi Horie

This study focused on the mass transfer characteristics in a Taylor flow reactor using α-methylstyrene hydrogenation as a model reaction. Specifically, the impact of liquid film thickness on the mass transfer rate was investigated. An aluminum tube with palladium-supported alumina on the inner wall was employed as a structured catalyst. The liquid film thickness between the gas slug and the inner wall was adjusted by manipulating the gas-liquid flow rates to study its impact on the reaction rate. It was found that the reaction rate inversely correlates with the liquid film thickness and directly correlates with the gas holdup. A significant discrepancy was observed when comparing the experimental reaction rates with those predicted by existing models. Analysis of the gas-solid mass transfer revealed that the increased diffusion distance, due to the catalyst surface roughness, was crucial. The reaction rate could be accurately predicted within ±20 % of the experimental values by incorporating surface roughness into the diffusion distance. Correctly determining the liquid film thickness is essential to accurately predict the hydrogenation rate under conditions dominated by mass transfer through the liquid film.

{"title":"Model analysis of mass transfer in liquid films in a Taylor flow reactor for gas-liquid-solid three-phase reactions","authors":"Takuya Fukui , Masahiro Yasuda , Takafumi Horie","doi":"10.1016/j.cep.2025.110151","DOIUrl":"10.1016/j.cep.2025.110151","url":null,"abstract":"<div><div>This study focused on the mass transfer characteristics in a Taylor flow reactor using α-methylstyrene hydrogenation as a model reaction. Specifically, the impact of liquid film thickness on the mass transfer rate was investigated. An aluminum tube with palladium-supported alumina on the inner wall was employed as a structured catalyst. The liquid film thickness between the gas slug and the inner wall was adjusted by manipulating the gas-liquid flow rates to study its impact on the reaction rate. It was found that the reaction rate inversely correlates with the liquid film thickness and directly correlates with the gas holdup. A significant discrepancy was observed when comparing the experimental reaction rates with those predicted by existing models. Analysis of the gas-solid mass transfer revealed that the increased diffusion distance, due to the catalyst surface roughness, was crucial. The reaction rate could be accurately predicted within ±20 % of the experimental values by incorporating surface roughness into the diffusion distance. Correctly determining the liquid film thickness is essential to accurately predict the hydrogenation rate under conditions dominated by mass transfer through the liquid film.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110151"},"PeriodicalIF":3.8,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bubble columns with internals: A review on research methodology and process intensification

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-01-05 DOI: 10.1016/j.cep.2025.110156

Peng Pan , Shi-Jiao Li , Hui-Long Wei , Xi-Bao Zhang , Zheng-Hong Luo

Gas-liquid and gas-liquid-solid bubble columns have been extensively employed in petrochemical and coal-chemical industries. The internals are frequently installed within bubble columns to intensify their transport and reactive performance. This work aims to comprehensively review the development of bubble columns with internals and its relevant research methodologies in recent years, especially the process intensification effect induced by internals. First, current applications of intrusive and non-intrusive experimental methodology alongside the most widely used Euler-based numerical methodology for bubble columns with internals are analyzed in detail. Thereafter, the effects of crucial internals (gas distributors, vertical tubes, and helical structures) on dynamics (gas holdup, liquid velocity, mass and heat transfer) and their inner mechanism in bubble columns are thoroughly summarized. Ultimately, several promising optimization strategies for bubble columns with internals are proposed. This review can provide insightful guidance on the design and optimization of bubble columns for various application scenarios.

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