Chemical Engineering and Processing - Process Intensification最新文献

Intensification and enhancement of phenolic compounds extraction using cooperative formulation

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-19 DOI: 10.1016/j.cep.2025.110220

Sazmin Sufi Suliman , Norasikin Othman , Muhammad Abbas Ahmad Zaini , Norul Fatiha Mohamed Noah , Izzat Naim Shamsul Kahar

In this study, intensification of palm oil mill steriliser condensate as a potential secondary source of phenolic compounds (PCs) were investigated. Synergistic reactive extraction with cooperative formulation appeared as a promising approach for recovering PCs, offering several advantages such as high selectivity, simplicity, ease of scale-up, and efficiency. The organic phase was formulated using mixture of vegetable oils as a sustainable green diluent. The carrier was added into the organic phase to select the potential base and synergist carriers in order to improve the extraction performance of PCs. The complexes of carrier-PC was study for the recovery purpose. A synergist stripping agent was formulated using mixture of salt. The finding indicated that about 93.33% of PCs were successfully extracted with a synergistic coefficient (SC) value of 5.09 using 0.25 M Aliquat 336 and 2.0 mM D2EHPA diluted in mixed vegetable oils of sunflower and palm oil at a ratio of 60:40. Meanwhile, the recovery study demonstrated that 0.04 M Na₂CO₃/1.00 M NaOH was selected as the stripping performance was up to 99.99% with SC value of 2.13. Consequently, the synergistic formulation employed in reactive extraction process demonstrates potential for the recovery of PCs from palm oil mill steriliser condensate.

{"title":"Intensification and enhancement of phenolic compounds extraction using cooperative formulation","authors":"Sazmin Sufi Suliman , Norasikin Othman , Muhammad Abbas Ahmad Zaini , Norul Fatiha Mohamed Noah , Izzat Naim Shamsul Kahar","doi":"10.1016/j.cep.2025.110220","DOIUrl":"10.1016/j.cep.2025.110220","url":null,"abstract":"<div><div>In this study, intensification of palm oil mill steriliser condensate as a potential secondary source of phenolic compounds (PCs) were investigated. Synergistic reactive extraction with cooperative formulation appeared as a promising approach for recovering PCs, offering several advantages such as high selectivity, simplicity, ease of scale-up, and efficiency. The organic phase was formulated using mixture of vegetable oils as a sustainable green diluent. The carrier was added into the organic phase to select the potential base and synergist carriers in order to improve the extraction performance of PCs. The complexes of carrier-PC was study for the recovery purpose. A synergist stripping agent was formulated using mixture of salt. The finding indicated that about 93.33% of PCs were successfully extracted with a synergistic coefficient (SC) value of 5.09 using 0.25 M Aliquat 336 and 2.0 mM D2EHPA diluted in mixed vegetable oils of sunflower and palm oil at a ratio of 60:40. Meanwhile, the recovery study demonstrated that 0.04 M Na<sub>2</sub>CO<sub>3</sub>/1.00 M NaOH was selected as the stripping performance was up to 99.99% with SC value of 2.13. Consequently, the synergistic formulation employed in reactive extraction process demonstrates potential for the recovery of PCs from palm oil mill steriliser condensate.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"211 ","pages":"Article 110220"},"PeriodicalIF":3.8,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437456","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 chloroquine adsorption using cobalt-modified mesoporous silicas for water treatment

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-17 DOI: 10.1016/j.cep.2025.110224

Renata Mariane de Souza , Grace Anne Vieira Magalhães-Ghiotto , Rosângela Bergamasco

The widespread use of chloroquine (CQ) during the COVID-19 pandemic has led to its accumulation in water bodies due to the inefficiency of wastewater treatment plants (WWTPs). This study synthesized, characterized, and evaluated mesoporous silicas MCM-41 and MCM-48 modified with cobalt oxide nanoparticles for CQ removal. Characterization was conducted to assess the adsorbent properties and their correlation with the adsorption process. The materials exhibited high surface areas (S_BET > 369.49 m² g⁻¹) and uniform mesoporous structures, confirming their suitability for adsorption and desirable properties for recalcitrant contaminant removal. Adsorption kinetics followed the Elovich model, with equilibrium capacities of 25.3 mg g⁻¹ (MCM-41-CoO) and 24.04 mg g⁻¹ (MCM-48-CoO), and intraparticle diffusion governed by a multi-step process. Isotherms were best described by the Sips model, with maximum adsorption capacities of 24.78 mg g⁻¹ (MCM-41-CoO) and 24.00 mg g⁻¹ (MCM-48-CoO) at temperatures ranging from 15 to 45 °C. Thermodynamic parameters indicated a spontaneous, endothermic process with low randomness, suggesting chemical interaction in a monolayer followed by electrostatic interactions. These findings highlight the efficiency of modified mesoporous silicas as adsorbents for CQ, a critical pharmaceutical contaminant, and contribute to developing sustainable water treatment technologies essential for environmental protection and public health.

{"title":"Enhanced chloroquine adsorption using cobalt-modified mesoporous silicas for water treatment","authors":"Renata Mariane de Souza , Grace Anne Vieira Magalhães-Ghiotto , Rosângela Bergamasco","doi":"10.1016/j.cep.2025.110224","DOIUrl":"10.1016/j.cep.2025.110224","url":null,"abstract":"<div><div>The widespread use of chloroquine (CQ) during the COVID-19 pandemic has led to its accumulation in water bodies due to the inefficiency of wastewater treatment plants (WWTPs). This study synthesized, characterized, and evaluated mesoporous silicas MCM-41 and MCM-48 modified with cobalt oxide nanoparticles for CQ removal. Characterization was conducted to assess the adsorbent properties and their correlation with the adsorption process. The materials exhibited high surface areas (S<sub>BET</sub> > 369.49 m<sup>2</sup> g<sup>−1</sup>) and uniform mesoporous structures, confirming their suitability for adsorption and desirable properties for recalcitrant contaminant removal. Adsorption kinetics followed the Elovich model, with equilibrium capacities of 25.3 mg g<sup>−1</sup> (MCM-41-CoO) and 24.04 mg g<sup>−1</sup> (MCM-48-CoO), and intraparticle diffusion governed by a multi-step process. Isotherms were best described by the Sips model, with maximum adsorption capacities of 24.78 mg g<sup>−1</sup> (MCM-41-CoO) and 24.00 mg g<sup>−1</sup> (MCM-48-CoO) at temperatures ranging from 15 to 45 °C. Thermodynamic parameters indicated a spontaneous, endothermic process with low randomness, suggesting chemical interaction in a monolayer followed by electrostatic interactions. These findings highlight the efficiency of modified mesoporous silicas as adsorbents for CQ, a critical pharmaceutical contaminant, and contribute to developing sustainable water treatment technologies essential for environmental protection and public health.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"210 ","pages":"Article 110224"},"PeriodicalIF":3.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420073","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

Development of 3D-printed electrodes using polyacrylonitrile/ graphene composites for application in polysulfide bromide flow battery

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-15 DOI: 10.1016/j.cep.2025.110233

Rungsima Yeetsorn , Saksitt Chitvuttichot , Adisorn Tuantranont , Tanyakarn Treeratanaphitak , Jeff Gostick

The performance of Polysulfide Bromide Flow Batteries (PBS) is depended on the design of the electrodes, which plays a crucial role in ensuring optimal electrolyte distribution and conductivity. These factors are essential for facilitating efficient electrochemical kinetics. This study introduces a novel approach to electrode fabrication using polyacrylonitrile/graphene composites through 3D printing, which enhances structural uniformity and electrical conductivity. The incorporation of reduced graphene oxide, with an electrical conductivity of 23 S/m, into polyacrylonitrile-based electrodes substantially improves their electrical conductivity. Unlike traditional techniques that produce randomly oriented fibers, 3D printing offers precise control over electrode architecture. This enables uniform electrolyte flow, improved mass transfer, and increased electrolyte diffusion across the electrode surface. The precise architectural design ensures that the electrolyte's retention time is aligned with its inert properties and optimizing the electrochemical process. One of the two 3D-printed electrode designs exhibited a diffusion coefficient of 73.85 × 10^-13 m²/s. This research not only overcomes the limitations of traditional electrode fabrication techniques but also highlights the potential of advanced 3D printing technologies in the creation of next-generation flow battery electrodes. The findings from this study could pave the way for the development of more efficient, durable, and scalable energy storage systems.

{"title":"Development of 3D-printed electrodes using polyacrylonitrile/ graphene composites for application in polysulfide bromide flow battery","authors":"Rungsima Yeetsorn , Saksitt Chitvuttichot , Adisorn Tuantranont , Tanyakarn Treeratanaphitak , Jeff Gostick","doi":"10.1016/j.cep.2025.110233","DOIUrl":"10.1016/j.cep.2025.110233","url":null,"abstract":"<div><div>The performance of Polysulfide Bromide Flow Batteries (PBS) is depended on the design of the electrodes, which plays a crucial role in ensuring optimal electrolyte distribution and conductivity. These factors are essential for facilitating efficient electrochemical kinetics. This study introduces a novel approach to electrode fabrication using polyacrylonitrile/graphene composites through 3D printing, which enhances structural uniformity and electrical conductivity. The incorporation of reduced graphene oxide, with an electrical conductivity of 23 S/m, into polyacrylonitrile-based electrodes substantially improves their electrical conductivity. Unlike traditional techniques that produce randomly oriented fibers, 3D printing offers precise control over electrode architecture. This enables uniform electrolyte flow, improved mass transfer, and increased electrolyte diffusion across the electrode surface. The precise architectural design ensures that the electrolyte's retention time is aligned with its inert properties and optimizing the electrochemical process. One of the two 3D-printed electrode designs exhibited a diffusion coefficient of 73.85 × 10<sup>-13</sup> m<sup>2</sup>/s. This research not only overcomes the limitations of traditional electrode fabrication techniques but also highlights the potential of advanced 3D printing technologies in the creation of next-generation flow battery electrodes. The findings from this study could pave the way for the development of more efficient, durable, and scalable energy storage systems.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"211 ","pages":"Article 110233"},"PeriodicalIF":3.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437455","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

Process modeling, simulation and thermodynamic analysis of a novel process integrating coal gasification, smelting reduction and methanol synthesis for ironmaking and methanol co-production

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-14 DOI: 10.1016/j.cep.2025.110231

Hao Cheng , Guoqiang Cao , Zhongren Ba , Donghai Hu , Yongbin Wang , Guorong Zhu , Chunyu Li , Jiantao Zhao , Yitian Fang

A novel process integrating coal gasification, smelting reduction, and methanol synthesis process has been proposed and designed to produce both high-quality hot metal and methanol. This process comprises eight key units: Coal Gasification Pre-reduction, Smelting Reduction, Water Gas Shift, Acid Gas Removal, CO₂ Compression and Storage, Gas and Steam Turbine, Methanol Synthesis, and Distillation. The innovative aspect of this process lies in the partial recycling of H₂ rich clean syngas which is generated from the WGS and AGR stages. Key operational parameters based on the feed of coal is 100 tones/h, such as the ore/coal ratio, oxygen/coal ratio, circulation ratio (CR), and oxygen replenishment (OR) were optimized at values of 1.4, 0.8, 0.5, and 10 tons/h, respectively, enabling the co-production of 100 tons of hot metal and 55 tons of methanol. Thermodynamic analysis indicates that the energy consumption, energy efficiency, and exergy efficiency of the CGSRMS system per unit of product (1 t-Fe and 0.55 t-CH₃OH) are 10.47 GJ, 73.06 %, and 72.12 %, respectively. CO₂ emissions are significantly reduced to 0.91 t/h per unit of product, representing a 51.81 % decrease compared to conventional processes with same production outputs.

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引用次数: 0

Experimental and simulation study of a catalytic-membrane integrated system for efficient CO2 stripping 高效二氧化碳汽提催化膜集成系统的实验和模拟研究

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-13 DOI: 10.1016/j.cep.2025.110216

Muhammad Waseem, Nayef Ghasem, Mohamed Al-Marzouqi

Global warming, mainly caused by carbon dioxide (CO₂) emissions, is rapidly becoming a serious concern. The Carbon Capture, Utilization, and Storage (CCUS) process, particularly the amine-based absorption process, is among the most developed industrial processes for capturing CO₂ from anthropogenic and natural sources. However, the energy-intensive nature of the equipment, as well as its high capital cost, inhibits widespread application. A porous hollow fiber membrane contactor (HFMC) is considered a promising technique for solvent regeneration in CO₂ capture applications. Recent research on catalyst-assisted solvent regeneration has also shown that nano catalytic materials can reduce solvent regeneration energy costs while increasing CO₂ desorption. Therefore, a self-fabricated gas-liquid membrane contactor (GLMC) module integrated with catalytically promoted CO₂ desorption to maximize their potential for solvent regeneration is used in this paper. A polytetrafluoroethylene (PTFE) hollow fiber membrane module combined with and without catalytic stripping is tested for CO₂ stripping performance under varying gas-liquid flowrates, temperatures, and initial CO₂ loading concentrations. Increasing the liquid phase temperature and liquid flowrate significantly improved CO₂ stripping, whereas increasing the gas flowrate did not increase stripping flux as much. Adding nanomaterial increased the stripping efficiency of membrane modules from 53 % to 72 % at 80 °C during CO₂ stripping experiments. Catalytically assisted systems exhibited improved stripping efficiency from 48 % to 65 % when liquid flow rates were increased from 20 mL/min to 100 mL/min. A mathematical model for the fabricated module is developed for CO₂ stripping from rich ethanolamine (MEA) solutions and it is simulated using COMSOL. Model predictions align well with experimental data outcomes.

{"title":"Experimental and simulation study of a catalytic-membrane integrated system for efficient CO2 stripping","authors":"Muhammad Waseem, Nayef Ghasem, Mohamed Al-Marzouqi","doi":"10.1016/j.cep.2025.110216","DOIUrl":"10.1016/j.cep.2025.110216","url":null,"abstract":"<div><div>Global warming, mainly caused by carbon dioxide (CO<sub>2</sub>) emissions, is rapidly becoming a serious concern. The Carbon Capture, Utilization, and Storage (CCUS) process, particularly the amine-based absorption process, is among the most developed industrial processes for capturing CO<sub>2</sub> from anthropogenic and natural sources. However, the energy-intensive nature of the equipment, as well as its high capital cost, inhibits widespread application. A porous hollow fiber membrane contactor (HFMC) is considered a promising technique for solvent regeneration in CO<sub>2</sub> capture applications. Recent research on catalyst-assisted solvent regeneration has also shown that nano catalytic materials can reduce solvent regeneration energy costs while increasing CO<sub>2</sub> desorption. Therefore, a self-fabricated gas-liquid membrane contactor (GLMC) module integrated with catalytically promoted CO<sub>2</sub> desorption to maximize their potential for solvent regeneration is used in this paper. A polytetrafluoroethylene (PTFE) hollow fiber membrane module combined with and without catalytic stripping is tested for CO<sub>2</sub> stripping performance under varying gas-liquid flowrates, temperatures, and initial CO<sub>2</sub> loading concentrations. Increasing the liquid phase temperature and liquid flowrate significantly improved CO<sub>2</sub> stripping, whereas increasing the gas flowrate did not increase stripping flux as much. Adding nanomaterial increased the stripping efficiency of membrane modules from 53 % to 72 % at 80 °C during CO<sub>2</sub> stripping experiments. Catalytically assisted systems exhibited improved stripping efficiency from 48 % to 65 % when liquid flow rates were increased from 20 mL/min to 100 mL/min. A mathematical model for the fabricated module is developed for CO<sub>2</sub> stripping from rich ethanolamine (MEA) solutions and it is simulated using COMSOL. Model predictions align well with experimental data outcomes.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"211 ","pages":"Article 110216"},"PeriodicalIF":3.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430047","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

Intensified rotary drum bioreactor for cellulase production from agro-industrial residues by solid-state cultivation

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-12 DOI: 10.1016/j.cep.2025.110223

Lina María Grajales , Hailei Wang , Fernanda Perpétua Casciatori , João Claúdio Thoméo

Cellulolytic enzymes are vital for converting cellulosic residues into biofuels, yet large-scale production through solid-state cultivation (SSC) remains challenging due to the lack of suitable bioreactors. This study addresses this issue by developing a rotary drum bioreactor to produce cellulases from the thermophilic fungus Myceliophthora thermophila I-1D3b, using sugarcane bagasse and wheat bran as substrates. The bioreactor integrates upstream, fermentation, and downstream processes, streamlining production and enhancing efficiency. The study explored enzymatic activity (EA) at varying substrate loadings and drum rotation conditions. Although statistically similar, at 50 % loading, drum rotation slightly improved EA (49.12 U/mL ± 6.56 U/mL) compared to static conditions (47.78 U/mL ± 8.25 U/mL). Conversely, at 40 % loading, rotation reduced EA significantly (23.57 U/mL ± 3.17 U/mL) compared to static conditions (46.91 U/mL ± 8.17 U/mL). At 60 % loading, EA was similar under both static and rotated conditions. The design effectively supports fermentation, facilitates enzymatic extract recovery, and minimizes temperature and moisture gradients. These results demonstrate the rotary drum bioreactor's potential for scaling up cellulase production, offering a promising solution for industrial SSC processes.

{"title":"Intensified rotary drum bioreactor for cellulase production from agro-industrial residues by solid-state cultivation","authors":"Lina María Grajales , Hailei Wang , Fernanda Perpétua Casciatori , João Claúdio Thoméo","doi":"10.1016/j.cep.2025.110223","DOIUrl":"10.1016/j.cep.2025.110223","url":null,"abstract":"<div><div>Cellulolytic enzymes are vital for converting cellulosic residues into biofuels, yet large-scale production through solid-state cultivation (SSC) remains challenging due to the lack of suitable bioreactors. This study addresses this issue by developing a rotary drum bioreactor to produce cellulases from the thermophilic fungus <em>Myceliophthora thermophila</em> I-1D3b, using sugarcane bagasse and wheat bran as substrates. The bioreactor integrates upstream, fermentation, and downstream processes, streamlining production and enhancing efficiency. The study explored enzymatic activity (EA) at varying substrate loadings and drum rotation conditions. Although statistically similar, at 50 % loading, drum rotation slightly improved EA (49.12 U/mL ± 6.56 U/mL) compared to static conditions (47.78 U/mL ± 8.25 U/mL). Conversely, at 40 % loading, rotation reduced EA significantly (23.57 U/mL ± 3.17 U/mL) compared to static conditions (46.91 U/mL ± 8.17 U/mL). At 60 % loading, EA was similar under both static and rotated conditions. The design effectively supports fermentation, facilitates enzymatic extract recovery, and minimizes temperature and moisture gradients. These results demonstrate the rotary drum bioreactor's potential for scaling up cellulase production, offering a promising solution for industrial SSC processes.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"210 ","pages":"Article 110223"},"PeriodicalIF":3.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420091","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 the sustainability of intensified CO2 capture schemes

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-12 DOI: 10.1016/j.cep.2025.110222

Melanie Coronel-Muñoz , Ana Gabriela Romero-García , Brenda Huerta-Rosas , Eduardo Sánchez-Ramírez , Juan José Quiroz-Ramírez , Juan Gabriel Segovia-Hernández

The SDGs do address climate-related goals that are interconnected with the need to reduce greenhouse gas emissions. CO₂ capture involves the use of solvents such as Monoethanolamine (MEA), whose use, advantages, and disadvantages are well reported. Currently, there are alternative solvents that are theoretically more sustainable such as deep eutectic solvents (DES), however, a direct comparative with sustainable indicators is not always available. In this work, two schemes for the CO₂ capture process are evaluated and compared in a sustainable framework. Both schemes capture CO₂ from a combustion process to generate electricity. The first scheme considers Monoethanolamine (MEA) and the second scheme considers a DES (ChCl/ urea (1:2), considering in both schemes the use of natural gas, biogas, and coal as fuels that originate the CO₂ flux. The evaluation of both alternatives must be approached in a weighted manner and within a framework of sustainability. The results indicate that there is no single solution as the optimal solvent for CO₂ capture. It was observed that the choice of solvent is predominantly influenced by the type of fuel used in the combustion zone for electricity generation.

可持续发展目标确实涉及与气候相关的目标，这些目标与减少温室气体排放的需要相互关联。二氧化碳捕获需要使用单乙醇胺（MEA）等溶剂，其使用、优点和缺点已被广泛报道。目前，理论上有一些替代溶剂更具可持续性，如深共晶溶剂 (DES)，但并不总能与可持续指标进行直接比较。在这项工作中，我们在可持续框架内对两种二氧化碳捕集工艺方案进行了评估和比较。这两种方案都是从燃烧过程中捕获二氧化碳来发电。第一个方案考虑的是单乙醇胺（MEA），第二个方案考虑的是 DES（氯化氢/尿素（1:2）），两个方案都考虑使用天然气、沼气和煤作为产生二氧化碳通量的燃料。必须在可持续发展的框架内以加权方式对这两种替代方案进行评估。结果表明，二氧化碳捕获的最佳溶剂并不是单一的解决方案。据观察，溶剂的选择主要受发电燃烧区所用燃料类型的影响。

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引用次数: 0

Experimental study of acoustically induced hydroxyl radicals in hydrogen peroxide systems based on fluorescence analysis

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-11 DOI: 10.1016/j.cep.2025.110219

Wenlong Li , Linzheng Ye , XiJing Zhu , Yao Liu , Jialong Wu , Shida Chuai , Zexiao Wang

The hydroxyl radical (·OH), an extremely reactive oxidizing agent, can interact with both brittle and hard materials, such as single-crystal silicon carbide (SiC), facilitating material removal via ultrasonic-assisted chemical mechanical polishing (UCMP). It is crucial to explore the generation mechanism of acoustically induced ·OH radicals within the UCMP process. This study investigated the influence of ultrasonic duration, initial solution temperature, frequency, power, and initial hydrogen peroxide (H₂O₂) concentration on the ·OH radical yield in the H₂O₂ system based on fluorescence analysis. Furthermore, it elucidates the quantitative relationships between the parameters and ·OH radical generation. The experimental data showed that ultrasonic vibrations significantly enhanced the decomposition of H₂O₂, with the ultrasonic duration being key to ·OH radical production, increasing 32.42 times in 30 min without a water-bath. Water-bath conditions reduce the thermal effects, yielding ·OH at a rate of 0.1826. The initial temperature had little impact within a specific range, and the peaking ·OH yield increased at 0.0662 from 20 to 50 °C. Lower frequencies and higher powers enhanced the ·OH yield by 5.37 to 10.126 times. Low H₂O₂ concentrations produced high ·OH radicals, peaking at 3.753 μmol/L at 1.5 wt%. These results are vital for improving UCMP efficiency and surface quality.

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引用次数: 0

Optimizing the microchannel geometry for effective control of analyte band dispersion

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-11 DOI: 10.1016/j.cep.2025.110221

Iman Aslani, Mahdi Khatibi, Seyed Nezameddin Ashrafizadeh

Managing analyte band dispersion is a critical challenge in diagnostic systems, medical spectroscopy, chromatography, and drug delivery devices. Effective dispersion control ensures reliable measurements, enhanced resolution, heightened sensitivity, and improved system performance. This study emphasizes the importance of optimizing microchannel geometries, particularly curvature sections, to effectively control analyte band dispersion. To achieve this, four microchannel geometries, namely Type I to Type IV, each with distinct curvature differences, were analyzed to identify the optimal geometry with the lowest dispersion. Key parameters, including wall zeta potential, applied voltage, and the internal-to-external curvature radius ratio, were examined for their influence on dispersion. The finite element method was employed to solve the Laplace and Navier-Stokes equations for electric field and velocity distributions, while the unsteady-state diffusion-convection equation determined analyte concentration profiles. Results showed that dispersion reductions after optimization were 60 % for Type II, 48 % for Type III, and 32 % for Type IV microchannels, nevertheless for Type I microchannel dispersion remain constant after and before optimization about 70 %. Increasing the zeta potential from ζ = -0.1 V to ζ = -0.5 V led to a significant rise in dispersion from 25 % to 90 % post-optimization. Conversely, adjusting the curvature ratio R_r from 0.1 to 0.5 decreased dispersion from 42 % to 15 %. These findings underscore the importance of precise dispersion control in advancing analytical systems such as lab-on-disk and lab-on-chip technologies. This research provides valuable insights for optimizing microchannel designs to enhance the performance and reliability of various analytical and diagnostic applications.

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引用次数: 0

Biocatalytic kinetics of the reaction between CO2 and tertiary amine using carbonic anhydrase

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-10 DOI: 10.1016/j.cep.2025.110218

Meng-Meng Du , Yuan-Cheng Wang , Bao-Chang Sun , Yong Luo , Liang-Liang Zhang , Guang-Wen Chu , Hai-Kui Zou

Carbonic anhydrase (CA) is a high-efficiency biocatalyst that significantly improves the absorption of CO₂ by tertiary amine. This work aims to investigate kinetics behaviors from the perspective of enzymatic reaction mechanism. The influences of the CA concentration, type of tertiary amines, pH, and temperature on the reaction rate between CO₂ and tertiary amine (ν) and catalytic activity of CA (φ) were first investigated in a stopped-flow device. Adding 50 g∙m⁻³ CA enhanced ν in tertiary amine solutions by a factor ranging from 22 to 42 at 298 K and pH=9.5, demonstrating its excellent catalytic performance. The ν increased with increasing CA concentration, pH, temperature, and tertiary amine's pKa. φ increased with the increase of CA concentration, as well as the decrease of temperature, pH, and tertiary amine's pKa. Proteomics analysis further revealed that conformational changes of the CA's secondary structure induced by high pH and temperature altered the expressions of the local active-site region and deactivated CA, ultimately leading to a decrease in φ. Additionally, the CA-catalysis kinetics equation accorded with the Michaelis-Menten model, with catalytic second-order rate constants on the magnitude of 10⁷. Overall, this work provides a guideline for its industrial application in the CO₂ capture process.

{"title":"Biocatalytic kinetics of the reaction between CO2 and tertiary amine using carbonic anhydrase","authors":"Meng-Meng Du , Yuan-Cheng Wang , Bao-Chang Sun , Yong Luo , Liang-Liang Zhang , Guang-Wen Chu , Hai-Kui Zou","doi":"10.1016/j.cep.2025.110218","DOIUrl":"10.1016/j.cep.2025.110218","url":null,"abstract":"<div><div>Carbonic anhydrase (CA) is a high-efficiency biocatalyst that significantly improves the absorption of CO<sub>2</sub> by tertiary amine. This work aims to investigate kinetics behaviors from the perspective of enzymatic reaction mechanism. The influences of the CA concentration, type of tertiary amines, pH, and temperature on the reaction rate between CO<sub>2</sub> and tertiary amine (<em>ν</em>) and catalytic activity of CA (<em>φ</em>) were first investigated in a stopped-flow device. Adding 50 g∙m⁻³ CA enhanced <em>ν</em> in tertiary amine solutions by a factor ranging from 22 to 42 at 298 K and pH=9.5, demonstrating its excellent catalytic performance. The <em>ν</em> increased with increasing CA concentration, pH, temperature, and tertiary amine's <em>pK</em>a. <em>φ</em> increased with the increase of CA concentration, as well as the decrease of temperature, pH, and tertiary amine's <em>pK</em>a. Proteomics analysis further revealed that conformational changes of the CA's secondary structure induced by high pH and temperature altered the expressions of the local active-site region and deactivated CA, ultimately leading to a decrease in <em>φ</em>. Additionally, the CA-catalysis kinetics equation accorded with the Michaelis-Menten model, with catalytic second-order rate constants on the magnitude of 10<sup>7</sup>. Overall, this work provides a guideline for its industrial application in the CO<sub>2</sub> capture process.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"211 ","pages":"Article 110218"},"PeriodicalIF":3.8,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437454","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