Chemical Engineering and Processing - Process Intensification最新文献_第10页

One-step synthesis of lactide via separation-promoted catalytic self-transesterification reactions of lactates 通过乳酸盐的分离促进催化自转酯化反应一步合成内酯

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-30 DOI: 10.1016/j.cep.2024.109967

Shuo Ai, Kaili Gao, Zhenhua Huang, Wanguo Yu

{"title":"One-step synthesis of lactide via separation-promoted catalytic self-transesterification reactions of lactates","authors":"Shuo Ai, Kaili Gao, Zhenhua Huang, Wanguo Yu","doi":"10.1016/j.cep.2024.109967","DOIUrl":"10.1016/j.cep.2024.109967","url":null,"abstract":"<div><p>Lactide is an important building block of biodegradable polylactic acid. Lactide was synthesized via separation-promoted liquid-phase transesterification reactions of lactates. Amberlyst-15 resin exhibited relatively high catalytic activity due to its large number of strong Brønsted acid sites. Methyl lactate was much more reactive than butyl lactate due to its methyl group with smaller steric hindrance. The reactions were promoted by evaporating alcohol products with an open cylinder reactor with an opening degree of 5 %. In addition, the evaporation of substrate could be inhibited by adding a small quantity of <em>γ</em>-valerolactone. The lactide selectivity and yield reached 45.3 % and 18.2 %, respectively. After the recovery of starting materials for additional reaction, the overall yield of lactide reached 21.3 % (state-of-the-art: 45 %). The reaction pathway was clarified: Two methyl lactate molecules combined into an acyclic C<sub>7</sub> molecule via self-transesterification, followed by ring-closure reaction of this molecule. The SO<sub>3</sub>H groups on the resin catalyst were leachable, and coke was deposited on the catalyst, resulting in decrease of catalytic activity in reuse experiment. This direct synthesis method of lactide is much simpler than the conventional lactic-acid-based route, and the reaction conditions were much milder compared to other direct synthesis approaches.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 109967"},"PeriodicalIF":3.8,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150526","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

Numerical simulation and optimization of gas premixing structures for tail gas incinerators 尾气焚化炉气体预混结构的数值模拟与优化

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-27 DOI: 10.1016/j.cep.2024.109963

Qihui Hu, Liesibieke Talafubieke, Buze Yin

{"title":"Numerical simulation and optimization of gas premixing structures for tail gas incinerators","authors":"Qihui Hu, Liesibieke Talafubieke, Buze Yin","doi":"10.1016/j.cep.2024.109963","DOIUrl":"10.1016/j.cep.2024.109963","url":null,"abstract":"<div><p>It is a common practice for chemical refinery tail gases to be treated in an incinerator and then released into the atmosphere. However, tail gas combustion is a key component in ensuring that the treatment process meets the relevant standards. In this paper, a vertical tail gas incinerator gas premixing structure design is proposed, aiming to improve the gas mixing effect. Based on the basic structure of the right-hand gas distribution pipe and the single-layer fan mixer at the throat, three new structures are proposed. The five new gas-premixing structures were combined into eight new structures. A series of numerical simulations were performed for one prototype premixed structure and five new premixed structures, respectively. The gas premixing structures were screened, evaluated, and optimized using gas mixing inhomogeneity and pressure loss as control parameters. Finally, the premixing structure with the best combination for the mixing unit was selected. This study is of great significance for improving the effectiveness of tail gas incineration in chemical refineries and protecting the ecological environment.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109963"},"PeriodicalIF":3.8,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095762","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

Experimental and CFD studies on collection efficiency of separator with arc settlers of fluidized bed catalytic reactor 流化床催化反应器弧形沉降器分离器收集效率的实验和 CFD 研究

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-27 DOI: 10.1016/j.cep.2024.109959

V.E. Zinurov , A.V. Dmitriev , V.V. Kharkov , E.I. Salakhova

引用次数: 0

Experimental study on the treatment of furfural wastewater by ozone-Fenton coupling intensification 臭氧-芬顿耦合强化法处理糠醛废水的实验研究

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-26 DOI: 10.1016/j.cep.2024.109960

Keyan Liu, Leiming Wang, Yifeng Han, Jinliang Tao, Feng Wei

{"title":"Experimental study on the treatment of furfural wastewater by ozone-Fenton coupling intensification","authors":"Keyan Liu, Leiming Wang, Yifeng Han, Jinliang Tao, Feng Wei","doi":"10.1016/j.cep.2024.109960","DOIUrl":"10.1016/j.cep.2024.109960","url":null,"abstract":"<div><p>Furfural production generates wastewater characterized by high concentration, strong acidity, and poor biodegradability, necessitating treatment before discharge. The Fenton process, known for its cost-effectiveness, is widely used for industrial wastewater treatment. However, it has limitations such as a narrow pH operating range and significant secondary pollution. To optimize this, researchers have explored combining Fenton with other processes, yet few have studied its synergy with O<sub>3</sub>. This study investigates the advantages of O<sub>3</sub>/Fenton coupling in treating furfural wastewater, comparing the capabilities of O<sub>3</sub>, O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub>, Fenton, and O<sub>3</sub>/Fenton processes. Results show that ozone-Fenton coupling exhibits superior industrial treatment performance. Post-treatment, the wastewater's B/C ratio reached 0.43, TOC removal rate was 33.6%, and ozone utilization efficiency was 74.6%, surpassing other methods. UV absorption spectra analysis indicated enhanced degradation of aromatic compounds, transforming them into smaller organic molecules. This study highlights ozone-Fenton coupling as a low-cost, effective enhancement for furfural wastewater treatment, offering significant guidance for future research in this field.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109960"},"PeriodicalIF":3.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142089506","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

Recent advances and intensifications in Haber-Bosch ammonia synthesis process 哈伯-博什合成氨工艺的最新进展和改进

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-26 DOI: 10.1016/j.cep.2024.109962

Navid Erfani , Luqmanulhakim Baharudin , Matthew Watson

{"title":"Recent advances and intensifications in Haber-Bosch ammonia synthesis process","authors":"Navid Erfani , Luqmanulhakim Baharudin , Matthew Watson","doi":"10.1016/j.cep.2024.109962","DOIUrl":"10.1016/j.cep.2024.109962","url":null,"abstract":"<div><p>Ammonia is crucial as it serves as a key nitrogen source in fertilizer production to enhance crop growth and as an emerging energy carrier due to its high hydrogen content and ease of liquefaction. Despite various technological changes proposed and implemented since its inception, the Haber-Bosch process remains the predominant method for ammonia production. We first give a bird's eye view of current ammonia synthesis technologies available based on the latest trends, to justify why we think the conventional Haber-Bosch process is still a relevant technology worth investigation for further improvement. We review the engineering design modifications within the ammonia synthesis loop, examining improvements in the efficiency of ammonia synthesis. This review gives an overview of recent research and advancements focused on process intensification within the loop and its individual key components, i.e., the reactor and the catalyst, separation, and purge gas recovery technologies. It highlights significant progress and explores potential future directions in these areas.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109962"},"PeriodicalIF":3.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0255270124003003/pdfft?md5=7c47a74d3e5979cb209424c6d70cd03f&pid=1-s2.0-S0255270124003003-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095680","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

Natural deep eutectic solvent-functionalized multiwall carbon nanotubes for lead removal from wastewater 天然深共晶溶剂功能化多壁碳纳米管用于去除废水中的铅

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-26 DOI: 10.1016/j.cep.2024.109961

Maan Hayyan , Khalid M. Abed , Amirah Azzouz , Adeeb Hayyan , Mahmood K.H. AL-Mashhadani

{"title":"Natural deep eutectic solvent-functionalized multiwall carbon nanotubes for lead removal from wastewater","authors":"Maan Hayyan , Khalid M. Abed , Amirah Azzouz , Adeeb Hayyan , Mahmood K.H. AL-Mashhadani","doi":"10.1016/j.cep.2024.109961","DOIUrl":"10.1016/j.cep.2024.109961","url":null,"abstract":"<div><p>In this study, two natural deep eutectic solvents (NADESs) were prepared from natural hydrogen bond donors (HBDs) based on sugar, namely fructose and sucrose, alongside H<sub>2</sub>O, and choline chloride as a hydrogen bond acceptor (HBA). The prepared NADESs were used as functionalizing agents with multiwall carbon nanotubes (MWCNTs), and the functionalized MWCNTs were used as adsorbents of Pb(II) lead ions from aqueous solution. The analyses demonstrated that MWCNTs functionalized with sucrose-based NADES to have more sub-stems and functional groups than the MWCNTs functionalized with fructose-based NADES, providing more possible sites for Pb(II) adsorption. The time dependence of Pb(II) adsorption onto these novel adsorbents was found to be better described by a pseudo-second-order kinetic model. Additionally, the Langmuir model better fits the adsorption data due to its higher coefficient of determination. Finally, the operating conditions (pH, adsorbent concentration, and contact time) were optimized using the Box-Behnken model, which demonstrated pH to exert greater influence on the adsorption process than the other studied factors. To the best of our knowledge, this study is the first to apply NADESs as emerging functionalizing agents for carbon nanomaterials in the removal of heavy metals from synthetic wastewater.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"205 ","pages":"Article 109961"},"PeriodicalIF":3.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of Mn–Co oxides loaded ceramic structured catalyst for microwave enhanced catalytic degradation of benzene 用于微波增强苯催化降解的锰钴氧化物负载陶瓷结构催化剂的研究

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-26 DOI: 10.1016/j.cep.2024.109957

Yijun Wang , Wenqi Chen , Hao Li , Nanya Zhong , Hualiang Cao , Kama Huang

{"title":"Investigation of Mn–Co oxides loaded ceramic structured catalyst for microwave enhanced catalytic degradation of benzene","authors":"Yijun Wang , Wenqi Chen , Hao Li , Nanya Zhong , Hualiang Cao , Kama Huang","doi":"10.1016/j.cep.2024.109957","DOIUrl":"10.1016/j.cep.2024.109957","url":null,"abstract":"<div><p>Compared with traditional heating, microwave heating has unique advantage and can enhance the chemical reaction. It is a promising technology for catalytic degradation of VOCs gas. Here we prepared a structured catalyst (Mn–Co/SiC) suitable for VOCs degradation under microwave. The catalyst shown excellent stability under microwave heating and microwave empowered the catalyst with good water resistance. Microwave heating exhibits high energy efficiency. Density functional theory is employed to investigate the microwave-enhanced catalytic degradation of VOCs. The theoretical calculation results indicate that the adsorption energy is more negative under microwave electric field, suggesting that microwave electric field is conducive to the activation of benzene. The electrons on the adsorption surface of the catalyst are redistributed to different degrees under the action of different microwave electric fields, thus affecting the activation of adsorbed molecules and chemical reaction process. The local density of states further reveals that electric fields may facilitate the electron transport.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109957"},"PeriodicalIF":3.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095679","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

Micro-mixing enhancement in a Taylor-Couette reactor using the inner rotors with various surface configurations 利用不同表面结构的内转子增强泰勒-库瓦特反应器中的微混合效果

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-24 DOI: 10.1016/j.cep.2024.109954

Bin Li , Guang Li , Xiaogang Yang , Shanshan Long , Yingrong Xu , Lu Liu , Yuan Zong

{"title":"Micro-mixing enhancement in a Taylor-Couette reactor using the inner rotors with various surface configurations","authors":"Bin Li , Guang Li , Xiaogang Yang , Shanshan Long , Yingrong Xu , Lu Liu , Yuan Zong","doi":"10.1016/j.cep.2024.109954","DOIUrl":"10.1016/j.cep.2024.109954","url":null,"abstract":"<div><p>This study investigates the effects of various inner cylinder configurations on micromixing and fluid dynamics within a Taylor-Couette (TC) reactor using the inner cylinders with different surface designs, including the traditional smooth-surfaced rotor cylinder. The four innovative inner cylinders were specifically designed with axial corrugations (N40 and N80) and three-dimensional rough surfaces (NZ40 and NZ80). Micromixing efficiency was assessed experimentally using the iodide-iodate reaction as a probe. To further understand the impact of the rotors' surface structures on micromixing, computational fluid dynamics (CFD) modelling was utilized to analyse the fluid dynamics within the TC reactor. An incorporation model was employed to calculate the micromixing time. The experimental findings reveal that the segregation index decreases with increasing rotation speed for all inner cylinders. Besides, NZ80′s micro-mixing efficiency surpasses that of its counterparts, NZ40, N40, and N80. The CFD modelling results underscore the significant influence of the inner cylinder's surface configuration on the turbulence dissipation rate and volume probability distribution, which are likely to contribute positively to the micromixing efficiency within the TC reactor. Furthermore, the empirical correlations obtained have been established to understand the micro-mixing time within TC reactors using different rotating cylinders.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109954"},"PeriodicalIF":3.8,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0255270124002927/pdfft?md5=17748b4cec05295b65b92d7b31b76352&pid=1-s2.0-S0255270124002927-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084334","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

Response surface methodology was used to optimize the defluorination process of steam-enhanced microwave roasting waste cathode carbon 采用响应面方法优化蒸汽强化微波焙烧废阴极碳的脱氟工艺

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-23 DOI: 10.1016/j.cep.2024.109955

Jielin Tian , Bensong Chen , Hongying Xia , Wanzhang Yang , Libo Zhang

{"title":"Response surface methodology was used to optimize the defluorination process of steam-enhanced microwave roasting waste cathode carbon","authors":"Jielin Tian , Bensong Chen , Hongying Xia , Wanzhang Yang , Libo Zhang","doi":"10.1016/j.cep.2024.109955","DOIUrl":"10.1016/j.cep.2024.109955","url":null,"abstract":"<div><p>As a typical hazardous solid waste, improper treatment of waste cathode carbon (WCC) will cause great harm to animals and plants and their living environment. In order to make the treatment of WCC more simple, efficient and clean, this paper mainly adopts the method of microwave roasting and introducing water vapor to make the fluoride in WCC melt at high temperature and be absorbed by water vapor. The effects of water flow rate, reaction temperature, reaction time, material particle size and other important factors on the defluorination efficiency of WCC were studied by single factor experiment. In this paper, the response surface method (RSM) was used to obtain and verify the best results of the experiment, and the optimum process conditions of water vapor enhanced microwave roasting WCC defluorination were determined: the reaction temperature was 1100 °C, the reaction time was 2.8 h, and the water flow rate was 3.2 mL·min<sup>−1</sup>. Under this condition, the defluorination effect of WCC is the best. The predicted value of defluorination efficiency of WCC is 99.85 %, and the actual value is 99.8 %.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109955"},"PeriodicalIF":3.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142089505","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

Electrified methane upgrading via non-thermal plasma: Intensified single-pass ethylene yield through structured bimetallic catalyst 通过非热等离子体实现电甲烷升级：通过结构化双金属催化剂提高单程乙烯产量

IF 3.8 3区工程技术

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-08-23 DOI: 10.1016/j.cep.2024.109946

Fabio Cameli , Marco Scapinello , Evangelos Delikonstantis , Georgios D. Stefanidis

{"title":"Electrified methane upgrading via non-thermal plasma: Intensified single-pass ethylene yield through structured bimetallic catalyst","authors":"Fabio Cameli , Marco Scapinello , Evangelos Delikonstantis , Georgios D. Stefanidis","doi":"10.1016/j.cep.2024.109946","DOIUrl":"10.1016/j.cep.2024.109946","url":null,"abstract":"<div><p>Chemical valorization of methane (CH<sub>4</sub>) via modular electrified reactors could represent a profitable avenue for biogas producers. Ethylene (C<sub>2</sub>H<sub>4</sub>) is the most valuable product due to its large demand that results in high energy cost and carbon emissions. However, alternative electrified processes proposed so far cannot compete with the state-of-the-art fossil route in terms of energy efficiency. The catalytic plasma reactor presented in this work achieves 34.4 % C<sub>2</sub>H<sub>4</sub> yield from non-oxidative CH<sub>4</sub> coupling, by integrating a bimetallic Pd-Ag catalyst on the surface of a 3D-printed structured electrode in a nanosecond-pulsed-discharge plasma reactor. This performance sets a new benchmark for alternative C<sub>2</sub>H<sub>4</sub> production, potentially relying purely on renewable energy. Onsite energy generation via the excess hydrogen produced in the process could allow recovery of 16 % of the input energy. Moreover, the process produces solid carbon deposit that can be collected on the surfaces in proximity of the plasma discharge. This residue shows amorphous features and significant incorporation of metal particles coming from the electrodes surface. Hence, its low surface area hampers its application as carbon black analogue.</p></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"204 ","pages":"Article 109946"},"PeriodicalIF":3.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142044966","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