Chemical Engineering Research & Design最新文献

英文中文

Security analysis of ethylene glycol production pathways

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2024.12.024

Jinqiang Liang , Danzhu Liu , Xunming Su , Xiaoling Xu , Yong Yi , Shuliang Xu , Mao Ye

In the production process of ethylene glycol (EG), which is considered a crucial basic chemical material, China's energy consumption and carbon emissions are greatly affected. This study examines seven different routes for EG production, focusing on their security implications. To evaluate the security of these production routes, a framework is proposed that considers various aspects of the chemical industry chain involved in EG production. The evaluation is conducted across five dimensions, namely the raw materials, technology, economics, environment, and energy consumption. The results show that CTEG and BTEG processes have advantage of high security performance in the raw materials scenario (R-Scenario). Corresponding, CTEG-2 and BTEG-1 routes have advantage of high security performance in the technology scenario (T-Scenario). NTEG and BTEG routes should be adopted according to environment scenario (E-Scenario). In the cost scenario (C-Scenario) and energy consumption scenario (EC-Scenario), OTEG and NTEG routes have the benefit of superior security capabilities because much better economic performance and low energy consumption compared with other routes. The findings of this study serve as a crucial foundation for enhancing the manufacturing process of EG. Additionally, it aids decision makers in selecting the most appropriate production method for EG, taking into account the prevailing circumstances.

{"title":"Security analysis of ethylene glycol production pathways","authors":"Jinqiang Liang , Danzhu Liu , Xunming Su , Xiaoling Xu , Yong Yi , Shuliang Xu , Mao Ye","doi":"10.1016/j.cherd.2024.12.024","DOIUrl":"10.1016/j.cherd.2024.12.024","url":null,"abstract":"<div><div>In the production process of ethylene glycol (EG), which is considered a crucial basic chemical material, China's energy consumption and carbon emissions are greatly affected. This study examines seven different routes for EG production, focusing on their security implications. To evaluate the security of these production routes, a framework is proposed that considers various aspects of the chemical industry chain involved in EG production. The evaluation is conducted across five dimensions, namely the raw materials, technology, economics, environment, and energy consumption. The results show that CTEG and BTEG processes have advantage of high security performance in the raw materials scenario (R-Scenario). Corresponding, CTEG-2 and BTEG-1 routes have advantage of high security performance in the technology scenario (T-Scenario). NTEG and BTEG routes should be adopted according to environment scenario (E-Scenario). In the cost scenario (C-Scenario) and energy consumption scenario (EC-Scenario), OTEG and NTEG routes have the benefit of superior security capabilities because much better economic performance and low energy consumption compared with other routes. The findings of this study serve as a crucial foundation for enhancing the manufacturing process of EG. Additionally, it aids decision makers in selecting the most appropriate production method for EG, taking into account the prevailing circumstances.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 65-77"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101741","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

Conceptual design, process simulation and economic evaluation for the production of synthetic fuels in Argentina

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2025.01.010

Eduardo M. Izurieta , Benjamín Cañete , Marisa N. Pedernera , Eduardo López

This paper presents the design and economic evaluation of an industrial plant for the production of e-fuels, specifically oriented to e-kerosene. The study deals with the conceptual design of the process, focusing on equipment sizing and thermal integration to optimize energy efficiency and kerosene yield. Key components of the plant include the synthesis gas production (reverse water gas shift), the Fischer-Tropsch synthesis unit, the hydrocracking reactor and distillation train. Auxiliary services (cooling water service and steam production and use) are included as well. Both hydrogen (produced electrolytically from wind energy) and carbon dioxide (captured from exhaust gas turbine nearby the plant) are considered as raw materials for the process under study. Results indicate a consumption of 0.8 kg_H2/kg_fuel and 3.1 kg_CO2/kg_fuel with a kerosene yield of ca. 75 %. The economic assessment considers capital and operating expenditures (CAPEX and OPEX), market conditions. Profitability indicators, such as Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PBP) and Levelized Cost of Fuel (LCoF), are used to evaluate the plant's financial viability. A sensitivity analyses explores the influence of hydrogen costs and kerosene selling pricing over the internal rate of return.

{"title":"Conceptual design, process simulation and economic evaluation for the production of synthetic fuels in Argentina","authors":"Eduardo M. Izurieta , Benjamín Cañete , Marisa N. Pedernera , Eduardo López","doi":"10.1016/j.cherd.2025.01.010","DOIUrl":"10.1016/j.cherd.2025.01.010","url":null,"abstract":"<div><div>This paper presents the design and economic evaluation of an industrial plant for the production of e-fuels, specifically oriented to e-kerosene. The study deals with the conceptual design of the process, focusing on equipment sizing and thermal integration to optimize energy efficiency and kerosene yield. Key components of the plant include the synthesis gas production (reverse water gas shift), the Fischer-Tropsch synthesis unit, the hydrocracking reactor and distillation train. Auxiliary services (cooling water service and steam production and use) are included as well. Both hydrogen (produced electrolytically from wind energy) and carbon dioxide (captured from exhaust gas turbine nearby the plant) are considered as raw materials for the process under study. Results indicate a consumption of 0.8 kg<sub>H2</sub>/kg<sub>fuel</sub> and 3.1 kg<sub>CO2</sub>/kg<sub>fuel</sub> with a kerosene yield of ca. 75 %. The economic assessment considers capital and operating expenditures (CAPEX and OPEX), market conditions. Profitability indicators, such as Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PBP) and Levelized Cost of Fuel (LCoF), are used to evaluate the plant's financial viability. A sensitivity analyses explores the influence of hydrogen costs and kerosene selling pricing over the internal rate of return.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 377-389"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101744","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

Incorporating convection into the solution-diffusion framework enhances modeling accuracy in reverse osmosis

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2025.01.012

Mingheng Li , Joseph Li

Several linear correlation equations are derived from the classical solution-diffusion theory and applied to analyze over 100 experimental datasets collected under constant and sinusoidally varying feed flows and pressures. While the theory provides reasonable predictions for water flux, it fails to accurately model permeate concentration, particularly in cases of membrane degradation. Incorporating convective transport over a small portion of the membrane successfully captures the recovery rate and permeate quality across all scenarios studied (R

^{2} \geq

0.99). This enhanced model, with only three parameters, holds significant potential for advancing future membrane transport modeling efforts.

引用次数: 0

Hydrometallurgy recycling of heavy metals from electroplating sludge: Recent development and challenge

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2024.12.035

Zhu Suiyi , Lan Xin , Zheng Minglin , Lin Yingzi , Li Siwen , Htet Oo Kaung , Yang Weilu , Qin Wensheng , Jadambaa Temuujin , Yu Yang , Liu Jiancong , Luo Wenjing , Chen Yu

Electroplating sludge contains various heavy metals along with impurities such as iron, aluminum, silicon, and calcium. The hydrometallurgical route offers significant advantages for recovering high-purity heavy metal products from sludge, including sponge, salt, and oxyhydroxides. This paper reviews classical hydrometallurgical processes, such as selective leaching, thermochemical extraction, precipitation, and crystallization. Given the co-dissolution of heavy metals and impurities in acidic or alkaline solutions, the efficient separation of impurities is emphasized to simplify these often complex hydrometallurgical processes. Additionally, this review explores the chemical transformation and separation of impurities into byproducts such as gypsum, anorthite, hematite, giniite, boehmite, and natroalunite. Ultimately, this review provides a theoretical foundation for the effective treatment and resource recovery of industrial electroplating sludge.

{"title":"Hydrometallurgy recycling of heavy metals from electroplating sludge: Recent development and challenge","authors":"Zhu Suiyi , Lan Xin , Zheng Minglin , Lin Yingzi , Li Siwen , Htet Oo Kaung , Yang Weilu , Qin Wensheng , Jadambaa Temuujin , Yu Yang , Liu Jiancong , Luo Wenjing , Chen Yu","doi":"10.1016/j.cherd.2024.12.035","DOIUrl":"10.1016/j.cherd.2024.12.035","url":null,"abstract":"<div><div>Electroplating sludge contains various heavy metals along with impurities such as iron, aluminum, silicon, and calcium. The hydrometallurgical route offers significant advantages for recovering high-purity heavy metal products from sludge, including sponge, salt, and oxyhydroxides. This paper reviews classical hydrometallurgical processes, such as selective leaching, thermochemical extraction, precipitation, and crystallization. Given the co-dissolution of heavy metals and impurities in acidic or alkaline solutions, the efficient separation of impurities is emphasized to simplify these often complex hydrometallurgical processes. Additionally, this review explores the chemical transformation and separation of impurities into byproducts such as gypsum, anorthite, hematite, giniite, boehmite, and natroalunite. Ultimately, this review provides a theoretical foundation for the effective treatment and resource recovery of industrial electroplating sludge.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 269-280"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101301","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

Comment on “Comparative phenomenological modeling of the overall adsorption rate of drugs onto activated carbon. The case of the chlorpheniramine”

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2025.01.019

Khim Hoong Chu, Mohd Ali Hashim

引用次数: 0

Removal of Cr(Ⅵ) by continuous flow electrocoagulation reactor at controlled and uncontrolled initial pH conditions

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2025.01.015

Nawid Ahmad Akhtar , Mehmet Kobya , Alireza Khataee

In this work, we studied the impact of various operating parameters, including reaction time (t), applied current (i), charge loading (q), initial pH, initial Cr concentration (mg/L), and wastewater flow rate (Q), on the removal of Cr (VI) from synthetic tap water. The investigation is conducted using Fe scrap anodes in a continuous flow electrocoagulation process (CFEC) with both controlled and uncontrolled initial pH conditions. Cr(VI) removal efficiency under controlled pH conditions was found to be 100 % under optimum conditions (t = 6 min, i = 1 A, pH = 2.5, q = 6.67 C/L or 4.145 F/m³, Q = 15 mL/min, and C_i = 90 mg/L). In the case of uncontrolled pH conditions at optimum conditions (t = 12 min, i = 1 A, pH = 2.5, q = 13.33 C/L or 8.29 F/m³, Q = 15 mL/min, and C_i = 90 mg/L), the Cr(VI) removal efficiency was found to be 100 %. The Cr(VI) removal capacity and the iron to chromium molar ratio at controlled pH were 775 mg Cr/g Fe and 1.198 mol/mol, and at uncontrolled pH were 387.7 mg Cr/g Fe and 2.395 mol/mol, respectively. Finally, comprehensive investigations were carried out on specific energy consumption and total operating costs. The SEM results show that the sludge particles under controlled and uncontrolled pHs are irregular, characterized by amorphous structure and wrinkled surfaces with small agglomerations.

{"title":"Removal of Cr(Ⅵ) by continuous flow electrocoagulation reactor at controlled and uncontrolled initial pH conditions","authors":"Nawid Ahmad Akhtar , Mehmet Kobya , Alireza Khataee","doi":"10.1016/j.cherd.2025.01.015","DOIUrl":"10.1016/j.cherd.2025.01.015","url":null,"abstract":"<div><div>In this work, we studied the impact of various operating parameters, including reaction time (t), applied current (i), charge loading (q), initial pH, initial Cr concentration (mg/L), and wastewater flow rate (Q), on the removal of Cr (VI) from synthetic tap water. The investigation is conducted using Fe scrap anodes in a continuous flow electrocoagulation process (CFEC) with both controlled and uncontrolled initial pH conditions. Cr(VI) removal efficiency under controlled pH conditions was found to be 100 % under optimum conditions (t = 6 min, i = 1 A, pH = 2.5, q = 6.67 C/L or 4.145 F/m<sup>3</sup>, Q = 15 mL/min, and C<sub>i</sub> = 90 mg/L). In the case of uncontrolled pH conditions at optimum conditions (t = 12 min, i = 1 A, pH = 2.5, q = 13.33 C/L or 8.29 F/m<sup>3</sup>, Q = 15 mL/min, and C<sub>i</sub> = 90 mg/L), the Cr(VI) removal efficiency was found to be 100 %. The Cr(VI) removal capacity and the iron to chromium molar ratio at controlled pH were 775 mg Cr/g Fe and 1.198 mol/mol, and at uncontrolled pH were 387.7 mg Cr/g Fe and 2.395 mol/mol, respectively. Finally, comprehensive investigations were carried out on specific energy consumption and total operating costs. The SEM results show that the sludge particles under controlled and uncontrolled pHs are irregular, characterized by amorphous structure and wrinkled surfaces with small agglomerations.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 403-414"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101422","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

Optimizing microgrid design and operation: A decision-making framework for residential distributed energy systems in Brazil

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2024.12.033

Ana Paula Alves Amorim , Karen Valverde Pontes , Bogdan Dorneanu , Harvey Arellano-Garcia

This paper explores the optimization of microgrid design and operation for residential distributed energy systems in Brazil, addressing the growing demand for sustainable energy in the context of climate change. A decision-making framework based on Mixed-Integer Nonlinear Programming (MINLP) is proposed to integrate distributed energy resources (DERs) such as solar, wind, and biogas. Key challenges include managing the variability of renewable resources and complying with local regulations, while also addressing gaps in literature, particularly the impact of time-dependent efficiency profiles on energy sharing within microgrids. By employing innovative analyses and clustering techniques, the research optimizes microgrid configurations, accounting for seasonal demand fluctuations and the influence of incentive policies on system feasibility. The findings reveal that incorporating a time-dependent efficiency model can reduce total costs by 45 %. This reduction underscores the importance of accurate efficiency predictions, as the model captures variations in energy generation and utilization efficiency over time, improving system optimization. Additionally, the findings reveal that a well-structured optimization model can meet 100 % of electricity and hot water demands across all scenarios, with customized incentives playing a crucial role in reducing costs and promoting sustainability.

{"title":"Optimizing microgrid design and operation: A decision-making framework for residential distributed energy systems in Brazil","authors":"Ana Paula Alves Amorim , Karen Valverde Pontes , Bogdan Dorneanu , Harvey Arellano-Garcia","doi":"10.1016/j.cherd.2024.12.033","DOIUrl":"10.1016/j.cherd.2024.12.033","url":null,"abstract":"<div><div>This paper explores the optimization of microgrid design and operation for residential distributed energy systems in Brazil, addressing the growing demand for sustainable energy in the context of climate change. A decision-making framework based on Mixed-Integer Nonlinear Programming (MINLP) is proposed to integrate distributed energy resources (DERs) such as solar, wind, and biogas. Key challenges include managing the variability of renewable resources and complying with local regulations, while also addressing gaps in literature, particularly the impact of time-dependent efficiency profiles on energy sharing within microgrids. By employing innovative analyses and clustering techniques, the research optimizes microgrid configurations, accounting for seasonal demand fluctuations and the influence of incentive policies on system feasibility. The findings reveal that incorporating a time-dependent efficiency model can reduce total costs by 45 %. This reduction underscores the importance of accurate efficiency predictions, as the model captures variations in energy generation and utilization efficiency over time, improving system optimization. Additionally, the findings reveal that a well-structured optimization model can meet 100 % of electricity and hot water demands across all scenarios, with customized incentives playing a crucial role in reducing costs and promoting sustainability.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 251-268"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101743","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

Synthesis of silver sulfide acanthite phase nanoparticles for photothermal hybrid PSF membrane

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2025.01.011

Mubark Alshareef , Ahmed Alharbi , Sultan Ahmed , Amr Mohamed Mahmoud , Mohamed S. Fahmi , Mohamed E.A. Ali , Ahmed Shahat

Membrane distillation (MD) is an energy-intensive desalination technique hindered by high energy consumption. To address this limitation, we selected silver sulfide (Ag₂S) Nanoparticles (NPs) for incorporation into a polysulfone (PSF) membrane, aiming to enhance the photothermal membrane distillation (PMD) process. Ag₂S was chosen due to its unique photothermal properties, including efficient light absorption and conversion into heat, making it an ideal candidate for improving the thermal efficiency of MD membranes. The Ag₂S NPs were synthesized using the Chemical Bath Deposition (CBD) method and characterized through SEM, UV-spectroscopy, FT-IR, and EDX. The NPs were integrated into the PSF membrane at varying concentrations (0.5–2 %). The PSF/Ag₂S composite membranes demonstrated significant photothermal properties, with surface temperatures rising from 45.7°C to 52.3°C under light exposure. The water flux also improved from 5.4 L/m²h without light to 7.8 L/m²h with light in the optimal membrane containing 1.5 % Ag₂S. Additionally, contact angle (CA) measurements indicated increased hydrophobicity, while liquid entry pressure (LEP) values rose, further enhancing membrane performance. The composite membrane achieved a remarkable salt rejection rate of 99.99 %. These findings suggest that integrating Ag₂S NPs into PSF membranes significantly improves energy efficiency, water flux, and desalination performance. This makes it a promising approach for solar-driven desalination, with Ag₂S acting as an effective photothermal agent. The study underscores the potential of Ag₂S as a sustainable solution for improving MD efficiency, offering a new pathway to tackle global water scarcity.

{"title":"Synthesis of silver sulfide acanthite phase nanoparticles for photothermal hybrid PSF membrane","authors":"Mubark Alshareef , Ahmed Alharbi , Sultan Ahmed , Amr Mohamed Mahmoud , Mohamed S. Fahmi , Mohamed E.A. Ali , Ahmed Shahat","doi":"10.1016/j.cherd.2025.01.011","DOIUrl":"10.1016/j.cherd.2025.01.011","url":null,"abstract":"<div><div>Membrane distillation (MD) is an energy-intensive desalination technique hindered by high energy consumption. To address this limitation, we selected silver sulfide (Ag₂S) Nanoparticles (NPs) for incorporation into a polysulfone (PSF) membrane, aiming to enhance the photothermal membrane distillation (PMD) process. Ag₂S was chosen due to its unique photothermal properties, including efficient light absorption and conversion into heat, making it an ideal candidate for improving the thermal efficiency of MD membranes. The Ag₂S NPs were synthesized using the Chemical Bath Deposition (CBD) method and characterized through SEM, UV-spectroscopy, FT-IR, and EDX. The NPs were integrated into the PSF membrane at varying concentrations (0.5–2 %). The PSF/Ag₂S composite membranes demonstrated significant photothermal properties, with surface temperatures rising from 45.7°C to 52.3°C under light exposure. The water flux also improved from 5.4 L/m²h without light to 7.8 L/m²h with light in the optimal membrane containing 1.5 % Ag₂S. Additionally, contact angle (CA) measurements indicated increased hydrophobicity, while liquid entry pressure (LEP) values rose, further enhancing membrane performance. The composite membrane achieved a remarkable salt rejection rate of 99.99 %. These findings suggest that integrating Ag₂S NPs into PSF membranes significantly improves energy efficiency, water flux, and desalination performance. This makes it a promising approach for solar-driven desalination, with Ag₂S acting as an effective photothermal agent. The study underscores the potential of Ag₂S as a sustainable solution for improving MD efficiency, offering a new pathway to tackle global water scarcity.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 415-426"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101300","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

Comprehensive investigation of regeneration and performance of deactivated molecular sieves: Experimental characterization and molecular simulation analysis

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2024.12.029

Behrouz Bayati , Zahra Moafi , Alireza Arad , Catia Algieri , Mohsen Mansouri

The objective of this work is focused on the regeneration of deactivated 3 A zeolite used for four years at the Ilam Gas Refining Company for natural gas drying. In particular, the impact of coke removal by thermal treatment on the final characteristics of the molecular sieve has been deeply investigated. XRD analyses indicated that the zeolite structure remained unchanged up to a thermal treatment of 550°C. Significant changes in the zeolite structure occurred at higher temperature values. A reduction in water adsorption capacity than the fresh sample of about 40 % was found for zeolite samples activated in the temperature range 400 °C-550°C. The regenerated molecular sieve samples preserved their mechanical stability and so confirming their reuse over time. Molecular simulation revealed that coke in the zeolite cavities reduced the interaction energy between water vapor molecules and zeolite, as well as the oxygen atoms within the zeolite structure.

引用次数: 0

CFD simulation of isolated bubbles rising in Newtonian or non-Newtonian fluids inside a thin-gap bubble column

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design

Pub Date : 2025-02-01 DOI: 10.1016/j.cherd.2024.12.030

Sikandar Almani , Walid Blel , Emilie Gadoin , Caroline Gentric

Hydrodynamics of the bubbling process can be complex especially in thin bubble columns, when the gap has the same order of magnitude as the bubble diameter, and with complex fluids. It is then important to understand this phenomenon either by experimental investigation through optical methods such as shadowgraphy and/or Particle Image Velocimetry (PIV) or numerically by Computational Fluid Dynamics (CFD), which, when validated, can allow numerical experimentation in situations which are expensive to implement experimentally or time consuming. In this study, three-dimensional numerical simulations of isolated bubbles rising in Newtonian (water) or non-Newtonian (CarboxyMethyl Cellulose (CMC) and Xanthan Gum (XG) solutions) liquid phases mimicking Chlorella vulgaris cultures at 42 g.L⁻¹ concentration inside a 4 mm gap bubble column are performed using the volume of fluid (VOF) model with the ANSYS FLUENT 17.2 code. Results are validated by comparison with shadowgraphy experiments. Bubble terminal velocity, shape, and trajectory are numerically analysed. Wall shear stress (WSS) induced by the bubble, strain rate, viscosity and flow field around the bubble are also discussed. Numerical results show similar trends as experimental ones despite slightly lower terminal velocity and aspect ratio values are observed in comparison to the experimental results. The trajectory of the bubble is non-rectilinear for water and rectilinear for non-Newtonian fluids as observed experimentally. This numerical study highlights the bubble-liquid and bubble-wall interactions that will help to understand the complex phenomena of bubble rise in non-Newtonian media/microalgae suspensions at high concentrations at the local level in thin-gap bubble columns.

{"title":"CFD simulation of isolated bubbles rising in Newtonian or non-Newtonian fluids inside a thin-gap bubble column","authors":"Sikandar Almani , Walid Blel , Emilie Gadoin , Caroline Gentric","doi":"10.1016/j.cherd.2024.12.030","DOIUrl":"10.1016/j.cherd.2024.12.030","url":null,"abstract":"<div><div>Hydrodynamics of the bubbling process can be complex especially in thin bubble columns, when the gap has the same order of magnitude as the bubble diameter, and with complex fluids. It is then important to understand this phenomenon either by experimental investigation through optical methods such as shadowgraphy and/or Particle Image Velocimetry (PIV) or numerically by Computational Fluid Dynamics (CFD), which, when validated, can allow numerical experimentation in situations which are expensive to implement experimentally or time consuming. In this study, three-dimensional numerical simulations of isolated bubbles rising in Newtonian (water) or non-Newtonian (CarboxyMethyl Cellulose (CMC) and Xanthan Gum (XG) solutions) liquid phases mimicking <em>Chlorella vulgaris</em> cultures at 42 g.L<sup>−1</sup> concentration inside a 4 mm gap bubble column are performed using the volume of fluid (VOF) model with the ANSYS FLUENT 17.2 code. Results are validated by comparison with shadowgraphy experiments. Bubble terminal velocity, shape, and trajectory are numerically analysed. Wall shear stress (WSS) induced by the bubble, strain rate, viscosity and flow field around the bubble are also discussed. Numerical results show similar trends as experimental ones despite slightly lower terminal velocity and aspect ratio values are observed in comparison to the experimental results. The trajectory of the bubble is non-rectilinear for water and rectilinear for non-Newtonian fluids as observed experimentally. This numerical study highlights the bubble-liquid and bubble-wall interactions that will help to understand the complex phenomena of bubble rise in non-Newtonian media/microalgae suspensions at high concentrations at the local level in thin-gap bubble columns.</div></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":"214 ","pages":"Pages 202-218"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101312","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

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