Chemical Engineering and Processing - Process Intensification最新文献

英文中文

An in-depth analysis of Pebax-1657/GO-silica/PEI thin film nano-composite membranes for gas dehydration

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-06 DOI: 10.1016/j.cep.2025.110206

A.R. Valagohar, S.A. Hashemifard, A. Khosravi

This research aimed to study the effectiveness of blending Pebax-1657 polymer with GO/SiO₂ nanoparticles in developing TFN membranes for N₂ gas dehydration. Different concentrations of nanoparticles (0 %, 0.5 %, and 1 %) were incorporated using dip coating. The nanocomposites were analyzed for their chemical structure, morphology, topology, and thermal stability using FTIR, SEM, CA, AFM, and TGA. The results showed that the samples had good thermal stability and a highly hydrophilic surface. The MP0.5–0.5 membrane with 0.5 % GO/SiO₂ nanoparticles demonstrated improved performance in water vapor and N₂ permeance at 2 × 10⁵ to 6 × 10⁵ Pa pressure and 70 % relative humidity. The addition of 0.5 % GO nanoparticles to the sample further enhanced H₂O and N₂ permeance and separation factor. However, in the case of the MP0.5–0.5 membrane, a different scenario unfolds, showcasing a synergistic effect and the ideal morphology was observed. The water vapor and nitrogen permeance of the MP0.5–0.5 membrane, under 2 × 10⁵ to 6 × 10⁵ Pa pressure and 70 % humidity, reaches from GPU 158 and GPU 0.23 (for the neat mebrane) to GPU 969 and GPU 31, respectively. The H₂O/N₂ separation factor was recorded as 679.It was observed that the relative humidity of the gas decreased from approximately 70 % to about 1.2 % during the membrane step, indicating the high efficiency of the membrane. The investigation concluded that the TFN membranes' dehydration characteristics are influenced by various factors, including morphology, plasticization, and hydrophilic properties. Changes in the feed gas flow rate also affected separation factor and nitrogen permeance. The rise in sweep gas flow had a notable impact on enhancing the membrane's separation factor by decreasing the transmembrane concentration gradient. Consequently, a trade-off emerges between water vapor flux and separation factor when employing the sweep gas stream. These discoveries are highly valuable in industrial settings, as they offer a more profound understanding of the topic.

{"title":"An in-depth analysis of Pebax-1657/GO-silica/PEI thin film nano-composite membranes for gas dehydration","authors":"A.R. Valagohar, S.A. Hashemifard, A. Khosravi","doi":"10.1016/j.cep.2025.110206","DOIUrl":"10.1016/j.cep.2025.110206","url":null,"abstract":"<div><div>This research aimed to study the effectiveness of blending Pebax-1657 polymer with GO/SiO<sub>2</sub> nanoparticles in developing TFN membranes for N<sub>2</sub> gas dehydration. Different concentrations of nanoparticles (0 %, 0.5 %, and 1 %) were incorporated using dip coating. The nanocomposites were analyzed for their chemical structure, morphology, topology, and thermal stability using FTIR, SEM, CA, AFM, and TGA. The results showed that the samples had good thermal stability and a highly hydrophilic surface. The MP0.5–0.5 membrane with 0.5 % GO/SiO<sub>2</sub> nanoparticles demonstrated improved performance in water vapor and N<sub>2</sub> permeance at 2 × 10<sup>5</sup> to 6 × 10<sup>5</sup> Pa pressure and 70 % relative humidity. The addition of 0.5 % GO nanoparticles to the sample further enhanced H<sub>2</sub>O and N<sub>2</sub> permeance and separation factor. However, in the case of the MP0.5–0.5 membrane, a different scenario unfolds, showcasing a synergistic effect and the ideal morphology was observed. The water vapor and nitrogen permeance of the MP0.5–0.5 membrane, under 2 × 10<sup>5</sup> to 6 × 10<sup>5</sup> Pa pressure and 70 % humidity, reaches from GPU 158 and GPU 0.23 (for the neat mebrane) to GPU 969 and GPU 31, respectively. The H<sub>2</sub>O/N<sub>2</sub> separation factor was recorded as 679.It was observed that the relative humidity of the gas decreased from approximately 70 % to about 1.2 % during the membrane step, indicating the high efficiency of the membrane. The investigation concluded that the TFN membranes' dehydration characteristics are influenced by various factors, including morphology, plasticization, and hydrophilic properties. Changes in the feed gas flow rate also affected separation factor and nitrogen permeance. The rise in sweep gas flow had a notable impact on enhancing the membrane's separation factor by decreasing the transmembrane concentration gradient. Consequently, a trade-off emerges between water vapor flux and separation factor when employing the sweep gas stream. These discoveries are highly valuable in industrial settings, as they offer a more profound understanding of the topic.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"210 ","pages":"Article 110206"},"PeriodicalIF":3.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378119","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

Investigation of CO2 condensation characteristics in nozzle based on Witoszynski curve equivalent centrosome model

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-06 DOI: 10.1016/j.cep.2025.110201

Yuanyuan Zhou , Yang Liu , Chenyu Han , Wenming Jiang , Qi Wang

Supersonic separation technology enables efficient carbon capture, incorporating supersonic fluid dynamics, swirling flow, and enhanced gas-liquid heat and mass transfer processes. The nozzle is the key place to realize the above method, and its structure greatly affects the gas flow and condensation characteristics. To solve the problems of difficulty, accuracy, and high cost of traditional nozzle inner surface machining, a nozzle structure with centroid and straight pipe segment was proposed. Based on droplet growth and classical nucleation theory, a spontaneous condensation model of CH₄-CO₂ mixture gas was established and the spontaneous condensation process of CO₂ was analyzed. The findings indicated that the CO₂ liquefaction efficiency in this structure can reach 42.5 %. A swirling condensation model is established, and the influences of swirling and inlet parameters on condensation parameters are considered. The findings indicate that: compared with the increase in inlet CO₂ concentration and reduced inlet temperature, the increase in inlet pressure has a more obvious effect on improving the liquefaction effect. When the pressure is increased from 4 MPa to 7 MPa, the liquefaction efficiency is increased from 26.1 % to 60.1 %, which is increased by 1.30 times. The above research helps promote the application of supersonic swirl separation technology.

{"title":"Investigation of CO2 condensation characteristics in nozzle based on Witoszynski curve equivalent centrosome model","authors":"Yuanyuan Zhou , Yang Liu , Chenyu Han , Wenming Jiang , Qi Wang","doi":"10.1016/j.cep.2025.110201","DOIUrl":"10.1016/j.cep.2025.110201","url":null,"abstract":"<div><div>Supersonic separation technology enables efficient carbon capture, incorporating supersonic fluid dynamics, swirling flow, and enhanced gas-liquid heat and mass transfer processes. The nozzle is the key place to realize the above method, and its structure greatly affects the gas flow and condensation characteristics. To solve the problems of difficulty, accuracy, and high cost of traditional nozzle inner surface machining, a nozzle structure with centroid and straight pipe segment was proposed. Based on droplet growth and classical nucleation theory, a spontaneous condensation model of CH₄-CO₂ mixture gas was established and the spontaneous condensation process of CO₂ was analyzed. The findings indicated that the CO<sub>2</sub> liquefaction efficiency in this structure can reach 42.5 %. A swirling condensation model is established, and the influences of swirling and inlet parameters on condensation parameters are considered. The findings indicate that: compared with the increase in inlet CO<sub>2</sub> concentration and reduced inlet temperature, the increase in inlet pressure has a more obvious effect on improving the liquefaction effect. When the pressure is increased from 4 MPa to 7 MPa, the liquefaction efficiency is increased from 26.1 % to 60.1 %, which is increased by 1.30 times. The above research helps promote the application of supersonic swirl separation technology.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"210 ","pages":"Article 110201"},"PeriodicalIF":3.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376466","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

Study on the properties of bulk micro-nanobubbles water generated by multi-jet hydrodynamic cavitation

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-06 DOI: 10.1016/j.cep.2025.110210

Yiming Hao , Hongyuan Zou , Bo Liu , Hongpeng Zhang , Li Sun , Mingsheng Cui

The micro-nanobubbles (MNBs) technology provides an innovative theoretical basis and application prospect for solving the problem of water treatment. However, the fabrication of bubble generators with high MNBs generation efficiency has always been challenging. Herein, we developed a new hydrodynamic cavitation bubble generator by equipping the multi-jet reactor to enhance the shear breakage effect of bubbles. The breakup behavior of bubbles with different diameters and velocities in jet orifices was investigated by numerical simulation. At the same time, the turbulent model of two-phase flow in the Venturi gas-liquid mixer was established to analyze the internal flow field under different intake rates. The bubble size and dissolved oxygen (DO) concentration of bulk MNBs water were determined through image analysis and a DO sensor, respectively. The results showed that the cavitation generator produced bubbles with diameters no larger than 27.85 μm. Moreover, the MNBs generator exhibited a superior oxygen-dissolving capability, which was 1.48 times that of general aerated water. This study has deepened the comprehension of the bubble breakup mechanism, providing a reference for designing and developing of MNBs generation technology.

{"title":"Study on the properties of bulk micro-nanobubbles water generated by multi-jet hydrodynamic cavitation","authors":"Yiming Hao , Hongyuan Zou , Bo Liu , Hongpeng Zhang , Li Sun , Mingsheng Cui","doi":"10.1016/j.cep.2025.110210","DOIUrl":"10.1016/j.cep.2025.110210","url":null,"abstract":"<div><div>The micro-nanobubbles (MNBs) technology provides an innovative theoretical basis and application prospect for solving the problem of water treatment. However, the fabrication of bubble generators with high MNBs generation efficiency has always been challenging. Herein, we developed a new hydrodynamic cavitation bubble generator by equipping the multi-jet reactor to enhance the shear breakage effect of bubbles. The breakup behavior of bubbles with different diameters and velocities in jet orifices was investigated by numerical simulation. At the same time, the turbulent model of two-phase flow in the Venturi gas-liquid mixer was established to analyze the internal flow field under different intake rates. The bubble size and dissolved oxygen (DO) concentration of bulk MNBs water were determined through image analysis and a DO sensor, respectively. The results showed that the cavitation generator produced bubbles with diameters no larger than 27.85 μm. Moreover, the MNBs generator exhibited a superior oxygen-dissolving capability, which was 1.48 times that of general aerated water. This study has deepened the comprehension of the bubble breakup mechanism, providing a reference for designing and developing of MNBs generation technology.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"210 ","pages":"Article 110210"},"PeriodicalIF":3.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420074","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

Blue LED photolytic method for the synthesis of 1,4-dihydropyridine derivatives from benzo [b]thiophene-2-carbaldehyde

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-05 DOI: 10.1016/j.cep.2025.110205

Anushka Servesh , Sankar Ganesh Ramaraj , J. Rajprasad , Sumaiya Tabassum , Santhosh Govindaraju

This study presents a highly efficient and operationally simple protocol for synthesizing 1,4-dihydropyridine derivatives. The protocol uses an inexpensive and readily available photocatalyst Mn₂(CO)₁₀, which plays a crucial role in the single-pot, four-component reaction involving benzo [b]thiophene-2-carbaldehyde, malononitrile, dialkyl acetylene dicarboxylate, and anilines in a blue LED (400–500 nm) photocatalytic technique. The reaction conditions include the use of blue LEDs, a lower catalyst load, and green solvents like dimethyl sulfoxide (DMSO) and water in a 1:1 ratio. The multicomponent photocatalytic approach negates the use of expensive catalysts and the necessity of multi-step routes, in addition to providing better atom economy and an easy work-up process, and it is environmentally benign. The derivatives were effectively synthesized in higher yields and characterized using ¹H NMR, ¹³C NMR, and ESI-MS. The obtained 1,4 dihydropyridines also have tremendous capability for biological and pharmacological activities, opening exciting possibilities for future research and applications.

{"title":"Blue LED photolytic method for the synthesis of 1,4-dihydropyridine derivatives from benzo [b]thiophene-2-carbaldehyde","authors":"Anushka Servesh , Sankar Ganesh Ramaraj , J. Rajprasad , Sumaiya Tabassum , Santhosh Govindaraju","doi":"10.1016/j.cep.2025.110205","DOIUrl":"10.1016/j.cep.2025.110205","url":null,"abstract":"<div><div>This study presents a highly efficient and operationally simple protocol for synthesizing 1,4-dihydropyridine derivatives. The protocol uses an inexpensive and readily available photocatalyst Mn<sub>2</sub>(CO)<sub>10</sub>, which plays a crucial role in the single-pot, four-component reaction involving benzo [<em>b</em>]thiophene-2-carbaldehyde, malononitrile, dialkyl acetylene dicarboxylate, and anilines in a blue LED (400–500 nm) photocatalytic technique. The reaction conditions include the use of blue LEDs, a lower catalyst load, and green solvents like dimethyl sulfoxide (DMSO) and water in a 1:1 ratio. The multicomponent photocatalytic approach negates the use of expensive catalysts and the necessity of multi-step routes, in addition to providing better atom economy and an easy work-up process, and it is environmentally benign. The derivatives were effectively synthesized in higher yields and characterized using <sup>1</sup>H NMR, <sup>13</sup>C NMR, and ESI-MS. The obtained 1,4 dihydropyridines also have tremendous capability for biological and pharmacological activities, opening exciting possibilities for future research and applications.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110205"},"PeriodicalIF":3.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372133","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

Numerical investigation on the structural optimization of a counter flow contact-cyclone reactor for epoxidation of fatty acid methyl ester

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-05 DOI: 10.1016/j.cep.2025.110204

Mingyang Zhang , Wenjie Zhu , Jie Cheng , Yaojun Guo , Haozhe Guo , Yingchun Yuan , Yuanjing Liu , Xiao Cong

In this paper, a counter flow contact-cyclone reactor was designed for the epoxidation of fatty acid methyl ester (FAME). The impinging stream was applied to enhance the mixing and reaction of FAME and peroxyformic acid. And the optimization of structural parameter of counter flow contact chamber (height, H, impinging length, L_i, accelerating tube length, L_a) was conducted using Eulerian model and RSM model. A parameter named mixing non-uniformity parameter, β, was used to evaluate the mixing performance between two liquids. Based on the variation of β along the radial and axial directions, the mixing between two liquids tends to be stable with the axial cross section approaching the guided vane. The structural parameters considered show influence on the mixing time evolution and the initial conditions for enhancing mixing using impinging stream, respectively. Eventually, the data shows the β after optimization (H of 120 mm, L_i of 30 mm, L_a of 40 mm) is approximately 0.09×10⁻² in the stable flow area, a decrease of 62.5 % compared to that before optimization. Moreover, the results also indicate that the vortices induced by impinging stream experience the evolution in both size and number, which is closely related to the gradual improvement of mixing efficiency between two liquids.

{"title":"Numerical investigation on the structural optimization of a counter flow contact-cyclone reactor for epoxidation of fatty acid methyl ester","authors":"Mingyang Zhang , Wenjie Zhu , Jie Cheng , Yaojun Guo , Haozhe Guo , Yingchun Yuan , Yuanjing Liu , Xiao Cong","doi":"10.1016/j.cep.2025.110204","DOIUrl":"10.1016/j.cep.2025.110204","url":null,"abstract":"<div><div>In this paper, a counter flow contact-cyclone reactor was designed for the epoxidation of fatty acid methyl ester (FAME). The impinging stream was applied to enhance the mixing and reaction of FAME and peroxyformic acid. And the optimization of structural parameter of counter flow contact chamber (height, <em>H</em>, impinging length, <em>L<sub>i</sub></em>, accelerating tube length, <em>L<sub>a</sub></em>) was conducted using Eulerian model and RSM model. A parameter named mixing non-uniformity parameter, <em>β</em>, was used to evaluate the mixing performance between two liquids. Based on the variation of <em>β</em> along the radial and axial directions, the mixing between two liquids tends to be stable with the axial cross section approaching the guided vane. The structural parameters considered show influence on the mixing time evolution and the initial conditions for enhancing mixing using impinging stream, respectively. Eventually, the data shows the <em>β</em> after optimization (<em>H</em> of 120 mm, <em>L<sub>i</sub></em> of 30 mm, <em>L<sub>a</sub></em> of 40 mm) is approximately 0.09×10<sup>−2</sup> in the stable flow area, a decrease of 62.5 % compared to that before optimization. Moreover, the results also indicate that the vortices induced by impinging stream experience the evolution in both size and number, which is closely related to the gradual improvement of mixing efficiency between two liquids.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110204"},"PeriodicalIF":3.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372132","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

Mechanism of leaching zinc from low-grade zinc oxide by ultrasonic enhancement

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-03 DOI: 10.1016/j.cep.2025.110203

Yihong Dang , Zhifei Yang , Guo Lin , Benkang Zhai , Heng Zhang , Xiaowei Sheng , Shiwei Li , Libo Zhang

In view of the depletion of sphalerite and the shortage of zinc resources, zinc leaching from low-grade zinc oxide (LZO) had become an important research direction. A new technology of ultrasonic enhanced H₂SO₄ solution leaching of LZO was proposed. The effects of H₂SO₄ solution concentration, ultrasonic power, reaction temperature, solid-liquid ratio and agitation rate on zinc leaching rate and zinc leaching kinetics were investigated. The results showed that the leaching rate of ultrasonic-enhanced leaching under optimal conditions was 95.45 %, which was 3.61 % higher than that of the traditional leaching procedure. The kinetic analysis showed that the process of ultrasonic-enhanced leaching of LZO was controlled by product diffusion and interfacial reaction, and the ultrasonic enhancement of leaching conditions reduced the activation energy from 21.375 kJ/mol to 13.912 kJ/mol. In addition, the characterization analysis showed that ultrasound opened and dissociated the particles in the wrapped state, exposing more interfaces and accelerating the reaction. This study could accelerate the promotion and application of ultrasonic enhancement in the field of enhancement leaching of low-grade ores.

{"title":"Mechanism of leaching zinc from low-grade zinc oxide by ultrasonic enhancement","authors":"Yihong Dang , Zhifei Yang , Guo Lin , Benkang Zhai , Heng Zhang , Xiaowei Sheng , Shiwei Li , Libo Zhang","doi":"10.1016/j.cep.2025.110203","DOIUrl":"10.1016/j.cep.2025.110203","url":null,"abstract":"<div><div>In view of the depletion of sphalerite and the shortage of zinc resources, zinc leaching from low-grade zinc oxide (LZO) had become an important research direction. A new technology of ultrasonic enhanced H<sub>2</sub>SO<sub>4</sub> solution leaching of LZO was proposed. The effects of H<sub>2</sub>SO<sub>4</sub> solution concentration, ultrasonic power, reaction temperature, solid-liquid ratio and agitation rate on zinc leaching rate and zinc leaching kinetics were investigated. The results showed that the leaching rate of ultrasonic-enhanced leaching under optimal conditions was 95.45 %, which was 3.61 % higher than that of the traditional leaching procedure. The kinetic analysis showed that the process of ultrasonic-enhanced leaching of LZO was controlled by product diffusion and interfacial reaction, and the ultrasonic enhancement of leaching conditions reduced the activation energy from 21.375 kJ/mol to 13.912 kJ/mol. In addition, the characterization analysis showed that ultrasound opened and dissociated the particles in the wrapped state, exposing more interfaces and accelerating the reaction. This study could accelerate the promotion and application of ultrasonic enhancement in the field of enhancement leaching of low-grade ores.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"209 ","pages":"Article 110203"},"PeriodicalIF":3.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372134","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

Enhanced leaching process of ion-adsorbed rare earth ores with itaconic acid and magnesium sulfate compound leaching agent

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110137

Haitao Wang , Lingyan Li , Jingang Hu , Yun Fang , Yang Liu , Jun Wang , Ruan Chi , Chunqiao Xiao

A compound leaching agent (CLA) composed of itaconic acid (IA) and MgSO₄ was employed in this study, and the effects of the ratio of the two components, in addition to the initial pH, temperature, and liquid–solid ratio on the leaching rate of rare earths were investigated. Under the following conditions: MgSO₄ content=1 %, IA concentration = 6.0 g/L, pH = 4.5, liquid–solid ratio = 3:1, and reaction temperature = 25 ℃, the leaching efficiency of rare earths was 95.03 %, which was 9.34 % higher than that observed when using the MgSO₄ (85.69 %). Furthermore, the residual Mg content in the tailings was decreased because of the reduction in the amount of MgSO₄. Compared with the tailings obtained using pure MgSO₄ as the leaching agent, the tailings obtained using CLA had 52.66 % lower Mg in the water-soluble state and 14.77 % lower Mg in the exchangeable state.

引用次数: 0

Multi-objective geometric optimization of protrusion, droplet ribs, and inclined upper plate of a slit jet impingement heat sink to enhance its thermal performance

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110076

Jianping Cheng, Dai Tang, Xinghao Li, Zhiguo Tang

To meet the needs of heat transfer and temperature uniformity in the heat dissipation of high-heat-flux electronic devices, a novel slit jet impingement heat sink with a protrusion in the stagnation region, droplet ribs in the wall jet region, and an inclined upper-plate (PDI-SJIHS) is proposed, the coolant is Al₂O₃H₂O nanofluid. The influences of the structural parameters of the above three components and the Reynolds number on the heat transfer and flow of the PDI-SJIHS are studied numerically. Using the comprehensive heat transfer and temperature standard deviation as objective functions, a multi-objective optimization of PDI-SJIHS is conducted using non-dominated sorting genetic algorithm-Ⅱ (NSGA-Ⅱ). The results indicate that the combination of the three components enhances the thermal performance of the PDI-SJIHS, compared with the slit jet impingement heat sink with only one of the above components. Rising the Reynolds number can enhance the thermal characteristics of the PDI-SJIHS. For a Reynolds number of 8000 and nanofluids with a 3 % volume fraction, the average convective heat transfer coefficient, friction coefficient, and comprehensive heat transfer coefficient of the optimized PDI-SJIHS are increased by 182 %, 153 %, and 108 %, respectively, and the standard deviation of temperature is 91 % less than that of F-SJIHS.

{"title":"Multi-objective geometric optimization of protrusion, droplet ribs, and inclined upper plate of a slit jet impingement heat sink to enhance its thermal performance","authors":"Jianping Cheng, Dai Tang, Xinghao Li, Zhiguo Tang","doi":"10.1016/j.cep.2024.110076","DOIUrl":"10.1016/j.cep.2024.110076","url":null,"abstract":"<div><div>To meet the needs of heat transfer and temperature uniformity in the heat dissipation of high-heat-flux electronic devices, a novel slit jet impingement heat sink with a protrusion in the stagnation region, droplet ribs in the wall jet region, and an inclined upper-plate (PDI-SJIHS) is proposed, the coolant is Al<sub>2</sub>O<sub>3</sub><sub><img></sub>H<sub>2</sub>O nanofluid. The influences of the structural parameters of the above three components and the Reynolds number on the heat transfer and flow of the PDI-SJIHS are studied numerically. Using the comprehensive heat transfer and temperature standard deviation as objective functions, a multi-objective optimization of PDI-SJIHS is conducted using non-dominated sorting genetic algorithm-Ⅱ (NSGA-Ⅱ). The results indicate that the combination of the three components enhances the thermal performance of the PDI-SJIHS, compared with the slit jet impingement heat sink with only one of the above components. Rising the Reynolds number can enhance the thermal characteristics of the PDI-SJIHS. For a Reynolds number of 8000 and nanofluids with a 3 % volume fraction, the average convective heat transfer coefficient, friction coefficient, and comprehensive heat transfer coefficient of the optimized PDI-SJIHS are increased by 182 %, 153 %, and 108 %, respectively, and the standard deviation of temperature is 91 % less than that of F-SJIHS.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110076"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163810","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

Assessment of mass transfer performance using the two-film theory and surrogate models for intensified CO2 capture process by amine solutions in rotating packed beds

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110080

Mohammad Shamsi , Jafar Towfighi Darian , Morteza Afkhamipour

CO₂ capture is a crucial aspect of attempts to mitigate climate change. The purpose of this study is to investigate the impacts of essential operating parameters on the mass transfer performance of absorbing CO₂ in rotating packed beds (RPBs). A multilayer perceptron neural network (MLPNN) model with the Levenberg-Marquardt learning algorithm, a mass transfer model using the two-film theory, and an empirical correlation model were developed to predict the overall gas-phase volumetric mass-transfer coefficient (

K_{G} a_{V}

) for RPB-based CO₂ absorption. The developed MLPNN model showed excellent agreement with the actual data, with an MSE of 0.0357, an AARD of 7.4%, and an R² of 0.9839. A sensitivity analysis was conducted using Taguchi orthogonal array design on distinct mass transfer correlations. The results of the two-film theory and surrogate models for the diethylenetriamine (DETA) solvent were compared. The MLPNN model provided better predictions than other developed models with an AARD of 13% for CO₂H₂O-DETA system. Therefore, the effects of operating parameters such as concentration, temperature, solvent flow rate, and rotational speed on

K_{G} a_{V}

and CO₂ removal efficiency were evaluated using the MLPNN model. Finally, an empirical correlation was proposed to predict

K_{G} a_{V}

as a function of operational parameters.

{"title":"Assessment of mass transfer performance using the two-film theory and surrogate models for intensified CO2 capture process by amine solutions in rotating packed beds","authors":"Mohammad Shamsi , Jafar Towfighi Darian , Morteza Afkhamipour","doi":"10.1016/j.cep.2024.110080","DOIUrl":"10.1016/j.cep.2024.110080","url":null,"abstract":"<div><div>CO<sub>2</sub> capture is a crucial aspect of attempts to mitigate climate change. The purpose of this study is to investigate the impacts of essential operating parameters on the mass transfer performance of absorbing CO<sub>2</sub> in rotating packed beds (RPBs). A multilayer perceptron neural network (MLPNN) model with the Levenberg-Marquardt learning algorithm, a mass transfer model using the two-film theory, and an empirical correlation model were developed to predict the overall gas-phase volumetric mass-transfer coefficient (<span><math><mrow><msub><mi>K</mi><mi>G</mi></msub><msub><mi>a</mi><mi>V</mi></msub></mrow></math></span>) for RPB-based CO<sub>2</sub> absorption. The developed MLPNN model showed excellent agreement with the actual data, with an MSE of 0.0357, an AARD of 7.4%, and an R<sup>2</sup> of 0.9839. A sensitivity analysis was conducted using Taguchi orthogonal array design on distinct mass transfer correlations. The results of the two-film theory and surrogate models for the diethylenetriamine (DETA) solvent were compared. The MLPNN model provided better predictions than other developed models with an AARD of 13% for CO<sub>2<img></sub>H<sub>2</sub>O-DETA system. Therefore, the effects of operating parameters such as concentration, temperature, solvent flow rate, and rotational speed on <span><math><mrow><msub><mi>K</mi><mi>G</mi></msub><msub><mi>a</mi><mi>V</mi></msub><mspace></mspace></mrow></math></span>and CO<sub>2</sub> removal efficiency were evaluated using the MLPNN model. Finally, an empirical correlation was proposed to predict <span><math><mrow><msub><mi>K</mi><mi>G</mi></msub><msub><mi>a</mi><mi>V</mi></msub><mspace></mspace></mrow></math></span>as a function of operational parameters.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110080"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164910","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 full factorial design for the decolorization of real textile wastewater using iron-rich montmorillonite by sonocatalytic process

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110111

Ezgi Aktar Demirtas , Yeşim Sağ Açıkel , Yeliz Aşçı

In this study, the sonocatalytic process was used to remove colour from the effluent of a textile factory located in Turkey. Clay from a brick-tile factory located in the city of Eskisehir was used to enhance the effect of ultrasound (US) at 20 kHz frequency and 750 W power. The structure, morphology and composition of the clay were identified by characterization studies including FT-IR, XRD, XRF, SEM and TGA. The clay consists mainly of montmorillonite and iron-rich montmorillonite as smectite minerals, nontronite, quartz minerals, calcite and dolomite as minor clay minerals. In the scope of the study, Design of Experiment (DoE) and a Full Factorial Design (FFD) was used to determine the operating conditions that affect the color removal efficiency of textile industry wastewater. pH, clay amount, time, and H₂O₂ concentration were determined as critical factors using Analysis of Variance (ANOVA). It has been confirmed that when the critical factors for color removal efficiency—specifically, a pH of 2, 2 g of clay, a duration of 120 min, and 35 ppm of H₂O₂—are kept constant, the resulting removal percentage was predicted as 94 % approximately by using regression model. The optimal levels of factors have been verified by the validation experiments.

{"title":"A full factorial design for the decolorization of real textile wastewater using iron-rich montmorillonite by sonocatalytic process","authors":"Ezgi Aktar Demirtas , Yeşim Sağ Açıkel , Yeliz Aşçı","doi":"10.1016/j.cep.2024.110111","DOIUrl":"10.1016/j.cep.2024.110111","url":null,"abstract":"<div><div>In this study, the sonocatalytic process was used to remove colour from the effluent of a textile factory located in Turkey. Clay from a brick-tile factory located in the city of Eskisehir was used to enhance the effect of ultrasound (US) at 20 kHz frequency and 750 W power. The structure, morphology and composition of the clay were identified by characterization studies including FT-IR, XRD, XRF, SEM and TGA. The clay consists mainly of montmorillonite and iron-rich montmorillonite as smectite minerals, nontronite, quartz minerals, calcite and dolomite as minor clay minerals. In the scope of the study, Design of Experiment (DoE) and a Full Factorial Design (FFD) was used to determine the operating conditions that affect the color removal efficiency of textile industry wastewater. pH, clay amount, time, and H<sub>2</sub>O<sub>2</sub> concentration were determined as critical factors using Analysis of Variance (ANOVA). It has been confirmed that when the critical factors for color removal efficiency—specifically, a pH of 2, 2 g of clay, a duration of 120 min, and 35 ppm of H<sub>2</sub>O<sub>2</sub>—are kept constant, the resulting removal percentage was predicted as 94 % approximately by using regression model. The optimal levels of factors have been verified by the validation experiments.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110111"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164934","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

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