Chemical Engineering and Processing - Process Intensification最新文献_第9页

Experimental investigations on the thermal destabilization and performance enhancement of ventilation air methane in a reversed flow oxidation reactor 反向流氧化反应器中通风气甲烷热失稳和性能提升的实验研究

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-22 DOI: 10.1016/j.cep.2024.109958

{"title":"Experimental investigations on the thermal destabilization and performance enhancement of ventilation air methane in a reversed flow oxidation reactor","authors":"","doi":"10.1016/j.cep.2024.109958","DOIUrl":"10.1016/j.cep.2024.109958","url":null,"abstract":"<div><p>Proper mitigation and utilization of coal mine ventilation air methane (VAM) are important to alleviate resource shortage and environmental issues. This work presents a pilot-scale experimental analysis of heat storage and oxidation performance in a VAM-fuelled reversal flow reactor, aiming at elucidating the thermal destabilization behaviour and providing feasible ways to maintain the system stability. Experimental results show that the system could become unstable under variable conditions. When the methane concentration is varied from 0.74 % to 0.70 %, the temperature is gradually becoming steady after operating the system for 5160 s. However, this balance will be broken, and the combustor is extinguished if the methane concentration is decreased from 0.68 % to 0.64 %. A critical average temperature of 780 °C in the combustion chamber is identified, below which the system starts to become unstable. Further analysis reveals the importance of heat-releasing proportion from the regenerator to the fresh gases in determining the system performance with the methane concentration varied. A sufficiently low proportion implies that the fresh gases cannot be properly preheated when entering the combustion chamber. Finally, increasing ventilation gas flow rate and reducing switching time are shown to be effective in promoting the oxidation process due to the enhanced heat storage.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095678","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

Combinatorial energy intensification of a ternary distillation process 三元蒸馏过程的组合能量强化

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-19 DOI: 10.1016/j.cep.2024.109952

{"title":"Combinatorial energy intensification of a ternary distillation process","authors":"","doi":"10.1016/j.cep.2024.109952","DOIUrl":"10.1016/j.cep.2024.109952","url":null,"abstract":"<div><p>Engineers seeking to improve performance and reduce the cost and environmental impact of distillation processes by energy intensification face a plethora of choices, including cyclic distillation, HiGee distillation, dividing-wall columns (DWCs), side-streams, column stacking, heat pumps, and others. Often multiple strategies can be combined in the same process. All of these methods have been shown to save energy and reduce cost separately, but alternatives are seldom compared and there is little guidance for selecting among the options. To address these deficiencies, in this work a combinatorial study of energy intensification strategies is conducted. For a given separation task (in this case the separation of methylcyclopentane, cyclohexane, and methylcyclohexane) and a set of intensification strategies, all feasible combinations are optimized and compared. The results show that all energy intensification strategies by themselves save money compared the base case. Without heat pumps, DWCs outperform stacked sequences and side-stream sequences, but the combination of stacking and side-streams performs better than the DWC. Heat pumps are found to reduce cost by themselves, but to increase cost when they are applied to DWCs or stacked sequences. A stacked side-stream sequence without a heat pump is found to perform the best overall.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142006819","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

Preparation of Ag-Cu-MOF-74 and its bromine adsorption in simulated saline water Ag-Cu-MOF-74 的制备及其在模拟盐水中的溴吸附作用

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-17 DOI: 10.1016/j.cep.2024.109949

引用次数: 0

One-step synthesis of superparamagnetic copper alginate gel microspheres (Cu2+-Alg@Fe3O4) using a compression nebulizer 利用压缩雾化器一步合成超顺磁性海藻酸铜凝胶微球（Cu2+-Alg@Fe3O4）

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-15 DOI: 10.1016/j.cep.2024.109950

引用次数: 0

Non-aqueous solvent extraction of cobalt and nickel using undiluted ionic liquids in milliflow contacting devices 在磨流式接触装置中使用未稀释离子液体进行钴和镍的非水溶剂萃取

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-14 DOI: 10.1016/j.cep.2024.109932

{"title":"Non-aqueous solvent extraction of cobalt and nickel using undiluted ionic liquids in milliflow contacting devices","authors":"","doi":"10.1016/j.cep.2024.109932","DOIUrl":"10.1016/j.cep.2024.109932","url":null,"abstract":"<div><p>Non-aqueous solvent extraction at elevated temperatures using undiluted ionic liquids in milliflow contacting devices has been identified as a feasible and alternative approach to accelerate and intensify such critical metal purification and recovery. In the present research, aforementioned principles were applied on the separation of a mixture of cobalt and nickel using two quarternary phosphonium-based extraction systems. For both investigated systems, selectivity towards extraction of cobalt to the extractant was observed. Extraction performance of the system involving EG and Cyphos IL 101 was found to be superior during batch trials. As a result, this system was selected for additional experiments involving the continuous milliflow setup, making it the first application of non-aqueous solvent extraction using ionic liquids in a milliflow reactor. Depending on the processing conditions such as tube diameter (0.08” or 0.04” ID) and flow rate (0.10 mL/min to 6.00 mL/min), different flow regimes and percentages extraction were attained. Best performance in flow was obtained for more elevated temperatures (80 °<span><math><mi>C</mi></math></span> and 140 °<span><math><mi>C</mi></math></span>) and low flow rates (<span><math><mo><</mo></math></span>0.25 mL/min), as a result of the improved kinetics and advantageous hydrodynamics. Variations of the reactor length to compare residence times under identical flow rates suggest kinetic limitations exist at lower temperatures.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0255270124002708/pdfft?md5=aa1266bb99f720f87d534e74eafa9a23&pid=1-s2.0-S0255270124002708-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993118","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

Photo Fenton-like oxidation of real textile wastewater: Operating conditions, kinetic modelling and cost analysis 实际纺织废水的光 Fenton 类氧化：操作条件、动力学模型和成本分析

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-13 DOI: 10.1016/j.cep.2024.109951

{"title":"Photo Fenton-like oxidation of real textile wastewater: Operating conditions, kinetic modelling and cost analysis","authors":"","doi":"10.1016/j.cep.2024.109951","DOIUrl":"10.1016/j.cep.2024.109951","url":null,"abstract":"<div><p>The reusability of the pretreated textile wastewater was improved by using bismuth ferrite/activated carbon hybrid photocatalysts in photo-Fenton-like oxidation process. BiFeO<sub>3</sub>/WAC (WAC: walnut shell based activated carbon) and BiFeO<sub>3</sub>/CAC (CAC: Commercial activated carbon) catalysts were synthesized and used for the photocatalytic oxidation of <em>in-situ</em> pretreated textile wastewater. The influences of the mixing speed, oxidant dosage, light source, catalyst loading, and temperature were studied. The highest TOC removal efficiencies were evaluated as 56.3% and 76.2% in the presence of BiFeO<sub>3</sub>/WAC and BiFeO<sub>3</sub>/CAC, respectively. A kinetic study was performed to derive the kinetic models expressing the TOC removal as a basis for the semi-pilot and industrial scale studies. The kinetic data fit to a two-step second order reaction rate model in the presence of both of the catalysts. The activation energies of the first and the second steps were calculated as 36.0 and 16.0 kJ/mol, respectively, on BiFeO<sub>3</sub>/WAC catalyst while 43.4 and 13.3 kJ/mol of activation energies were calculated on BiFeO<sub>3</sub>/CAC.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141998187","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 study on the intensification of gas–liquid mass transfer in trickle bed reactors by the application of strut-based and novel sheet-based periodic open cellular structures (POCS) 关于在滴流床反应器中应用支柱式和新型片式周期性开放细胞结构 (POCS) 强化气液传质的概念研究

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-10 DOI: 10.1016/j.cep.2024.109930

{"title":"Conceptual study on the intensification of gas–liquid mass transfer in trickle bed reactors by the application of strut-based and novel sheet-based periodic open cellular structures (POCS)","authors":"","doi":"10.1016/j.cep.2024.109930","DOIUrl":"10.1016/j.cep.2024.109930","url":null,"abstract":"<div><p>Rapid progress in the development of additive manufacturing technology enables the production of structured reactor internals of complex geometry. To address mass transport limitations structured internals can be used in trickle bed reactors (TBRs) as the most frequently used reactor for heterogeneously catalyzed multiphase reactions. However, reactions in TBRs are frequently limited by gas–liquid mass transfer.</p><p>As periodic open cellular structures (POCS) as reactor internals were not addressed regarding g–l mass transfer yet, this contribution provides first data on gas–liquid mass transfer for different types of POCS. Therefore, desorption of dissolved oxygen in water with nitrogen gas and the two-phase pressure drop were measured. Strut-based Kelvin and diamond unit cell POCS were compared to a sphere random packed bed as a benchmark. A novel sheet-based unit cell was developed realizing meandering channels demonstrating a fivefold increase in volumetric mass transfer coefficient compared to the benchmark. To compare the performance of the setup with literature data, state of the art neural network correlations were used for comparison. This proof of concept highlights the potential of additively manufactured POCS for intensified processes in trickle bed reactors, and demonstrates their versatility in application.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S025527012400268X/pdfft?md5=fc04facca46d6674665c11432932839d&pid=1-s2.0-S025527012400268X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141954108","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

Process optimization and scale-up of toluene nitration in a microchannel reactor using HNO3-AC2O as nitrating agent 使用 HNO3-AC2O 作为硝化剂在微通道反应器中进行甲苯硝化的工艺优化和规模扩大

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-10 DOI: 10.1016/j.cep.2024.109934

{"title":"Process optimization and scale-up of toluene nitration in a microchannel reactor using HNO3-AC2O as nitrating agent","authors":"","doi":"10.1016/j.cep.2024.109934","DOIUrl":"10.1016/j.cep.2024.109934","url":null,"abstract":"<div><p>Aromatic nitro compounds are an important class of basic chemical raw materials, while traditional nitration methods may cause safety accidents and environmental pollution due to strong exothermicity and presence of sulfuric acid. In this work, aiming to alleviate these issues, the nitration of toluene was conducted in a microchannel reactor with nitric acid and acetic anhydride. The effect of temperature, molar ratio of nitric acid to toluene, mass fraction of acetic anhydride, and residence time on the conversion and selectivity of reaction were systematically investigated, and response surface methodology was used to optimize the process. A mononitrotoluene yield of 99.21 % can be achieved under optimum condition. Meanwhile, in order to better understand the exothermic behavior, toluene nitration by HNO<sub>3</sub>-AC<sub>2</sub>O was investigated in the semi-batch calorimeter. Finally, the optimized process was scaled up and effect of volumetric flow rate was investigated. At the selected maximum volumetric flow rate, the overtemperature of the system was 10.9 °C with a 98.3 % yield of mononitrotoluene. Continuous flow mode had a space-time yield nearly two orders of magnitude greater than semi-batch mode. This work can provide guidance for safe, efficient and green synthesis of mononitrotoluene.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142040817","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

An Interview with Dr. Bettina Muster-Slawitsch 采访贝蒂娜-穆斯特-斯拉维茨博士

IF 4.3 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-10 DOI: 10.1016/j.cep.2024.109916

Enrique A. López-Guajardo

引用次数: 0

Main features of a novel extraction-hydrogenation unit 新型萃取-加氢装置的主要特点

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-10 DOI: 10.1016/j.cep.2024.109948

引用次数: 0