Chemical Engineering and Processing - Process Intensification最新文献_第6页

CFD-PBM numerical simulation and experimental investigation of hydrodynamics in a multistage internal loop reactor with guide cones 带导锥的多级内循环反应器流体力学的 CFD-PBM 数值模拟和实验研究

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-28 DOI: 10.1016/j.cep.2024.110044

Yekui Chen , Qingpeng Pan , Chaojie Li , Weiwen Wang , Jihai Duan

{"title":"CFD-PBM numerical simulation and experimental investigation of hydrodynamics in a multistage internal loop reactor with guide cones","authors":"Yekui Chen , Qingpeng Pan , Chaojie Li , Weiwen Wang , Jihai Duan","doi":"10.1016/j.cep.2024.110044","DOIUrl":"10.1016/j.cep.2024.110044","url":null,"abstract":"<div><div>Multistage internal loop reactors demonstrate a powerful application in biological wastewater degradation and with high solid concentrations fields. Due to the complexity of the gas-liquid-solid flow, the hydrodynamic characteristics of a multistage internal loop reactor are still ambiguous. This research focuses on a self-designed multistage internal loop reactor with guide cones and investigates the hydrodynamic characteristics by combining experiment and computational fluid dynamic-population balance model (CFD-PBM) numerical simulation. Meanwhile, validating the simulation results using particle image velocimetry (PIV) technique shows that the results are plausible. The investigation results indicate that the increment in superficial gas velocity can increase the gas holdup and volumetric mass transfer coefficient and decrease the mixing time. The addition of solid particles would get the opposite effects. In addition, the effects of bubbles on particles are summarized as driving and collision, and the particles motion in the riser and downcomer is analyzed based on the above effects. Research on the flow field of the liquid phase has found that an increase in superficial gas velocity and the addition of solid particles can generate vortices. Finally, A study of the bubble size distribution reveals larger bubble sizes in the second and third-stage riser.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"206 ","pages":"Article 110044"},"PeriodicalIF":3.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655087","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}

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Influence of inlet velocity on the separation performance of a combined hydrocyclone 入口速度对组合式水力旋流器分离性能的影响

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-21 DOI: 10.1016/j.cep.2024.110034

Yuekan Zhang, Wei Hu, Qingyun Zhang, Shuo Han

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Ultrasound-assisted extraction vs. microwave-assisted extraction for sustainable development goals: Selecting the ideal lipid extraction and fatty acid profile 实现可持续发展目标的超声辅助提取与微波辅助提取：选择理想的脂质提取和脂肪酸谱

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-20 DOI: 10.1016/j.cep.2024.110035

Alperen Alpural, Buse Dincoglu, Esra Imamoglu

{"title":"Ultrasound-assisted extraction vs. microwave-assisted extraction for sustainable development goals: Selecting the ideal lipid extraction and fatty acid profile","authors":"Alperen Alpural, Buse Dincoglu, Esra Imamoglu","doi":"10.1016/j.cep.2024.110035","DOIUrl":"10.1016/j.cep.2024.110035","url":null,"abstract":"<div><div>The objective of this study was to compare the efficiency of ultrasound-assisted extraction (UAE) and microwave-assisted extraction (MAE) methods for extracting lipids from the green microalga <em>Chlorococcum novae-angliae</em>. This study specifically focused on the fatty acid profiles of the extracted lipids, using ethanol as the solvent and wet biomass as the starting material. Ultrasound-assisted extraction yielded a maximum of 0.026 ± 0.001 g lipid/g wet biomass at a biomass ratio of 1:25 for 2 min with a 1-second cycle at 180 W and 20 kHz, which was 21% higher than that of microwave-assisted extraction conducted at a ratio of 1:30 for 2 min at 300 W and 35 °C. Ultrasound-assisted extraction enhanced saturated fatty acids (SFAs), which were 1.5 times higher than to microwave-assisted extraction, while microwave-assisted extraction significantly increased polyunsaturated fatty acids (PUFAs) by 4.4 times. The findings suggest that ultrasound-assisted extraction is more suitable for applications requiring high SFA content, such as in the fuel industry, whereas microwave-assisted extraction is preferable for sectors focused on fatty acid quality, such as food and health. This comparative analysis contributes to the literature by highlighting the impact of extraction methods on fatty acid profiles and supports sustainable development goals (SDGs), particularly SDG 12, by promoting environmentally friendly extraction techniques.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 110035"},"PeriodicalIF":3.8,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527970","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}

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Recent progresses in intensified heat exchanger reactors with millimetric zigzag channels 带毫米人字形通道的强化热交换器反应器的最新进展

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-20 DOI: 10.1016/j.cep.2024.110030

Nathalie Di Miceli Raimondi

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CFD simulation of power characteristics and flow field distribution of different spiral stirring paddles 不同螺旋搅拌桨动力特性和流场分布的 CFD 仿真

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-20 DOI: 10.1016/j.cep.2024.110033

Qingzhao Liu , Xubin Zhang , Xiaohong Xiong , Fumin Wang , Guobing Li , Shuai Liu , Qi Shen , Zhiwei Zhang , Yang Qin , Bingxin Zhu , Zheng Wang

{"title":"CFD simulation of power characteristics and flow field distribution of different spiral stirring paddles","authors":"Qingzhao Liu , Xubin Zhang , Xiaohong Xiong , Fumin Wang , Guobing Li , Shuai Liu , Qi Shen , Zhiwei Zhang , Yang Qin , Bingxin Zhu , Zheng Wang","doi":"10.1016/j.cep.2024.110033","DOIUrl":"10.1016/j.cep.2024.110033","url":null,"abstract":"<div><div>Stirred reactors are widely used in various industries, and the stirring paddle structure has a significant effect on its power consumption. Therefore, in this study, different spiral stirring paddles were investigated. The effects of the ratio of paddle length to leads (<em>Ls</em>/<em>S</em>) design values and number of blades on the power characteristics and internal flow field of the reactor are discussed in detail, and the correlation equation of power number (<em>Np</em>) concerning <em>Re</em> and <em>Ls</em>/<em>S</em> values is fitted. It was found that the <em>Np</em> of stirring paddles increased and then decreased as the <em>Ls</em>/<em>S</em> value increased, and the effect of the number of blades on the <em>Np</em> gradually reduced. When the <em>Ls</em>/<em>S</em> value is equal to 0.6, the high-speed region of the flow field is the largest and the mixing effect is the best. The conclusions obtained can provide a reference for the energy-saving optimal design of spiral stirring paddles.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 110033"},"PeriodicalIF":3.8,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527971","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}

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Intensification of fine particle flotation with less energy input using vortex generators 利用涡流发生器减少能量输入，强化细颗粒浮选工艺

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-18 DOI: 10.1016/j.cep.2024.110032

Kaixin Zheng , Xiaokang Yan , Lijun Wang , Haijun Zhang

{"title":"Intensification of fine particle flotation with less energy input using vortex generators","authors":"Kaixin Zheng , Xiaokang Yan , Lijun Wang , Haijun Zhang","doi":"10.1016/j.cep.2024.110032","DOIUrl":"10.1016/j.cep.2024.110032","url":null,"abstract":"<div><div>The separation of fine mineral particles has always been challenging in flotation. Previous studies generally believed that intensifying fine particle flotation necessarily involves higher energy expenditure. To explore the more effective intensification, this study measured the flotation performance of diaspore particles smaller than 20 µm in a mineralization pipe. The energy input was regulated by varying the slurry flow rate in the mineralization pipe and incorporating wedge-shaped vortex generator (VG) with different pinch angles. The results of flotation tests indicated that introduction of VG can achieve superior flotation performance with reduced energy input. A flotation rate of 0.86/min was obtained in the mineralization pipe with VG and a pinch angle of 60° (VGP-60) at an energy input of 27.29 W, much higher than that of 0.53 /min in empty pipe at 37.59 W. The more effective intensification is attributed to the high turbulent dissipation rate (<em>ε</em>) induced by VG. The volume-averaged <em>ε</em> in VGP-60 is 31.8 m<sup>2</sup>/s<sup>3</sup> at an energy input of 27.29 W, exceeding that in empty pipe at 37.59 W. The increased <em>ε</em> enhances the collision rate between particles and bubbles, thus causing the flotation rate to grow as a power function with exponent of 0.5.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 110032"},"PeriodicalIF":3.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527974","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}

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Process intensification technologies to enhance agricultural sustainability and safety 提高农业可持续性和安全性的加工强化技术

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-16 DOI: 10.1016/j.cep.2024.110029

Yi Wai Chiang

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Dynamic modeling and modification of ternary semicontinuous distillation without a middle vessel for improved controllability and energy performance 对无中间容器的三元半连续蒸馏进行动态建模和改进，以提高可控性和能效

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-16 DOI: 10.1016/j.cep.2024.110021

Mohammad Ehsan Azghandi, Hadi Mehdipour, Ali M. Sahlodin

{"title":"Dynamic modeling and modification of ternary semicontinuous distillation without a middle vessel for improved controllability and energy performance","authors":"Mohammad Ehsan Azghandi, Hadi Mehdipour, Ali M. Sahlodin","doi":"10.1016/j.cep.2024.110021","DOIUrl":"10.1016/j.cep.2024.110021","url":null,"abstract":"<div><div>Ternary distillation conventionally requires two sequential columns. In a process intensification technique, the second column is eliminated by operating the first column in a cyclic manner, where the intermediate component is withdrawn periodically from a side stream. This process, called semicontinuous distillation (SCD) without a middle vessel, can lower the separation costs significantly. However, it exhibits controllability challenges due to the periodic recycling of the side stream. In this work, the process controllability is improved by adding a surge tank in the side stream recycle path. The modification increases significantly the process robustness without changing the operation recipe. Also, the modified SCD can lower maintenance costs as the manipulated variables experience milder oscillations. Moreover, it is shown to have a faster startup than the original design, yielding about 13 % energy saving per feed processed and processing about 25 % more feed during the startup compared with the original design. The case studies show the surge tank volume should be chosen based on the trade-off between attenuation of undesired disturbances and slow-down of desired control actions. Also presented in this article is detailed hybrid discrete-continuous dynamic modeling of the SCD and how the resulting model is implemented in the open-source software OpenModelica.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 110021"},"PeriodicalIF":3.8,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527973","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}

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High performance of heterogeneous catalytic ozonation for tetracycline removal by a N-doped biochar derived from co-pyrolysis of sludge and water hyacinth 利用污泥和布袋莲共同热解产生的掺杂 N 的生物炭实现异相催化臭氧去除四环素的高性能化

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-16 DOI: 10.1016/j.cep.2024.110031

Huanxin Zhao , Mingyi Lv , Xiaoyuan Shang , Yuqi Liu , Huixin Yu

{"title":"High performance of heterogeneous catalytic ozonation for tetracycline removal by a N-doped biochar derived from co-pyrolysis of sludge and water hyacinth","authors":"Huanxin Zhao , Mingyi Lv , Xiaoyuan Shang , Yuqi Liu , Huixin Yu","doi":"10.1016/j.cep.2024.110031","DOIUrl":"10.1016/j.cep.2024.110031","url":null,"abstract":"<div><div>Enhancing the performance of heterogeneous catalytic ozonation (HCO) for contaminant removal using biochar that is both cost-effective and stable is of great significance. In this research, a novel nitrogen-doped biochar (HSBC) was synthesized through the co-pyrolysis of sludge and water hyacinth. The presence of pyrrolic N, pyridinic N and graphitic N in HSBC as well as the high-temperature co-pyrolysis process, conferred a high degree of graphitization to the biochar. The graphitic N species facilitated the generation of free radicals, while the graphitic structure enhanced electron transfer between the catalyst and tetracycline (TC). HSBC demonstrated exceptional efficiency in TC removal via HCO, achieving a 93% removal rate within just 130 min. Moreover, the biodegradability of actual printing and dyeing wastewater with a chemical oxygen demand (COD) of (9900 mg/L) was increased sevenfold after HCO treatment. This study offers new perspectives on the preparation of N-doped biochar and its practical application in the treatment of industrial wastewater through HCO processes.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 110031"},"PeriodicalIF":3.8,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527969","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

Ultrasound assisted interesterification of babassu oil with acetates using acid catalysts for biodiesel and triacetin production 使用酸催化剂超声辅助巴巴苏油与醋酸盐的酯化反应，以生产生物柴油和三醋精

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-15 DOI: 10.1016/j.cep.2024.110028

Jonas Miguel Priebe , Evandro L. Dall'Oglio , Leonardo Gomes de Vasconcelos , Paulo T. de Sousa Jr. , Andressa Alves Ramos , Emily Cristina O. da Silva , Carlos Alberto Kuhnen

{"title":"Ultrasound assisted interesterification of babassu oil with acetates using acid catalysts for biodiesel and triacetin production","authors":"Jonas Miguel Priebe , Evandro L. Dall'Oglio , Leonardo Gomes de Vasconcelos , Paulo T. de Sousa Jr. , Andressa Alves Ramos , Emily Cristina O. da Silva , Carlos Alberto Kuhnen","doi":"10.1016/j.cep.2024.110028","DOIUrl":"10.1016/j.cep.2024.110028","url":null,"abstract":"<div><div>The ultrasound-assisted (US) interesterification of babassu oil with methyl, ethyl and butyl acetates was carried out via acid catalysis for biodiesel production with triacetin as an additive and therefore filling the gap in the field of US induced interesterification reactions. The scanning for the best catalyst was performed using sulfuric, methanesulfonic, p-toluenesulfonic, phosphoric and acetic acids. In order to achieve optimal conditions reactions varied in terms of reactant molar ratio, type and concentration of catalyst, temperature (20 to 50 °C) and ultrasonic energy (120 to 320 W). Using ethyl acetate, reactions were carried out at various molar ratios of oil to acetate (1:12 to 1:72) using sulfuric acid (0.5 % w/w<sub>T</sub>). The 1:60 experiments were carried out with sulfuric acid concentrations ranging from 0.5 % to 3 % (w/w<sub>T</sub>). The best catalytic activity was sought using the acids at a concentration of 2.5 %, with 200 W and 1:60. The best catalytic activities were achieved with H<sub>2</sub>SO<sub>4</sub> followed by CH<sub>3</sub>SO<sub>3</sub>H and CH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>SO<sub>3</sub>H and the reactivity follows the ethyl→methyl→butyl trend. The best results were achieved using ethyl acetate with H<sub>2</sub>SO<sub>4</sub> yielding 95.4 % biodiesel plus triacetin with a content of 17.6 % of triacetin in 180 min, which represents an intensification of 25.4 % compared to conventional heating.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 110028"},"PeriodicalIF":3.8,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527967","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