Chinese Journal of Chemical Engineering最新文献

{"title":"Numerical simulation of power and flow field characteristics of different spiral stirred reactors","authors":"Qingzhao Liu,&nbsp;Yang Qin,&nbsp;Guodong Zhu,&nbsp;Xubin Zhang,&nbsp;Fumin Wang,&nbsp;Guobing Li,&nbsp;Shuai Liu,&nbsp;Zhiwei Zhang,&nbsp;Bingxin Zhu,&nbsp;Zheng Wang","doi":"10.1016/j.cjche.2024.10.021","DOIUrl":"10.1016/j.cjche.2024.10.021","url":null,"abstract":"<div><div>Under the dual-carbon background, the technological updating of traditional high-energy-consuming equipment should not be delayed, and the problem of reactor energy consumption should not be ignored. Therefore, this study is based on computational fluid dynamics (CFD) theory to simulate the spiral stirred reactor with different design parameters (distance of paddle from bottom surface to reactor height ratio <em>h</em>₁/<em>H</em>, diameter of stirring paddle to reactor diameter ratio <em>D</em>_s/<em>D</em>, length of blade section to reactor height ratio <em>L</em>_s/<em>H</em>). It was found that the reactor designed with lower <em>L</em>_s/<em>H</em> values and higher <em>h</em>₁/<em>H</em>, <em>D</em>_s/<em>D</em> values would have smaller power number (<em>Np</em>) values and smaller flow field average velocity. In addition, this study also fitted the correlation equation of <em>Np</em> concerning Reynolds number and <em>h</em>₁/<em>H</em>, <em>D</em>_s/<em>D</em>, and <em>L</em>_s/<em>H</em>, and the conclusions of the study can be used as a reference for the design of industrial equipment.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 218-231"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133672","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}

{"title":"Study on sulfur resistance of MnO2/Beta zeolite in toluene catalytic combustion: The effect of increased acidity on catalytic performance","authors":"Zhuo Wang ,&nbsp;Zetao Jin ,&nbsp;Hanqi Ning ,&nbsp;Baishun Jiang ,&nbsp;Kaiyuan Xie ,&nbsp;Shufeng Zuo ,&nbsp;Qiuyan Wang","doi":"10.1016/j.cjche.2024.10.023","DOIUrl":"10.1016/j.cjche.2024.10.023","url":null,"abstract":"<div><div>Sulfur dioxide (SO₂) frequently coexist with volatile organic compounds (VOCs) in exhaust gas. The competitive adsorption of SO₂ and VOCs can adversely affect the efficiency of catalytic combustion, leading to catalyst poisoning and irreversible loss of activity. To investigate the impact of sulfur poisoning on the catalysts, we prepared the MnO₂/Beta zeolite, and a corresponding series of sulfur-poisoned catalysts through <em>in-situ</em> thermal decomposition of (NH₄)₂SO₄. The decrease in toluene catalytic activity of poisoned MnO₂/Beta zeolite primarily results from the conversion of the active species MnO₂ to MnSO₄. However, the crystal structure and the porous structure of MnO₂/Beta zeolite were stable, and original structure was still maintained when 1.6% (mass) sulfur species were introduced. Furthermore, the extra-framework Al of Beta zeolite could capture sulfur species to generate Al₂(SO₄)₃, thereby reducing sulfur species from reacting with Mn⁴⁺ active sites. The combination of sulfur and Beta zeolite was found to directly produce new strong-acid sites, thus effectively compensating for the effect of reduced Mn⁴⁺ active species on the catalytic activity.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 187-195"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133711","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}

{"title":"Regional collaborative allocation of emergency resources for enterprises within a chemical industry park based on the worst credible accident scenarios","authors":"Shangzhi Liu ,&nbsp;Yaqi Wang ,&nbsp;Qinglong Liu ,&nbsp;Shilong Pang ,&nbsp;Dongfeng Zhao ,&nbsp;Jiangbo Jiu","doi":"10.1016/j.cjche.2024.09.032","DOIUrl":"10.1016/j.cjche.2024.09.032","url":null,"abstract":"<div><div>Emergency resources play a vital role in the emergency rescue process. The adequate and timely supply of emergency resources can effectively control the development of accidents and reduce accident losses. However, the current emergency resource allocation of chemical enterprises lacks scientific analysis of accident scenarios, and the individual allocation method of enterprises increases the cost of emergency resource allocation. Given the above problems, this paper proposes a regional collaborative allocation method of emergency resources for enterprises within the chemical industry park (CIP) based on the worst credible accident scenario (WCAS). Firstly, the concept and analysis method of the WCAS is proposed. Then, based on the characteristics and consequences of the accident, the mapping relationship between accident scenarios and emergency resources is established. Finally, an optimization model for regional collaborative allocation of emergency resources is constructed to determine the amount of emergency resource allocation for each enterprise. Through the case study, the emergency resource allocation method based on the WCAS analysis can better meet the demands of accident emergency rescue. Simultaneously, the regional collaborative allocation optimization model can strengthen the cooperation ability among enterprises, greatly reducing the cost of emergency resource allocation for each enterprise.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 140-149"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133768","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}

{"title":"Micromixing efficiency and enhancement methods for non-Newtonian fluids in millimeter channel reactors","authors":"Zhaoyi Song ,&nbsp;Yuanxi Zhang ,&nbsp;Guangwen Chu ,&nbsp;Lei Shao ,&nbsp;Yang Xiang","doi":"10.1016/j.cjche.2024.08.006","DOIUrl":"10.1016/j.cjche.2024.08.006","url":null,"abstract":"<div><div>Millimeter channel reactors (MCRs) have received increasing attention because of their ability to enhance treatment capacity in addition to the advantages of microchannels. In previous studies, less work has been conducted on the micromixing process and enhancement strategies for non-Newtonian fluids in MCRs. In this study, the micromixing efficiency in MCRs was experimentally investigated using CMC (aqueous carboxymethyl cellulose sodium) aqueous solution to simulate a non-Newtonian fluid, and the enhanced mechanism of micromixing efficiency by the addition of internals and rotation was analyzed by computational fluid dynamics (CFD) simulations. The results show that in the conventional channel, increasing the flow rate improves the micromixing efficiency when the CMC concentration is low. However, when the CMC concentration is higher, the higher the flow rate, the lower the micromixing efficiency. The highest micromixing efficiency is obtained for the rotationally coupled inner components, followed by the single rotation and the lowest is for the internals only. CFD simulations reveal that the most effective way to improve the micromixing efficiency of non-Newtonian fluids with shear-thinning behavior is to increase the shear force in the reactor, which effectively reduces the apparent viscosity. These results provide the theoretical foundation for enhancing the micromixing process of non-Newtonian fluids in small-size reactors.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 108-119"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133769","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}

{"title":"Properties evolutions during carbonization of carbon foam using lignin as sole precursor","authors":"Chen Liang ,&nbsp;Weiqiang Chen ,&nbsp;Linghong Yin ,&nbsp;Xianli Wu ,&nbsp;Jie Xu ,&nbsp;Chunhua Du ,&nbsp;Wangda Qu","doi":"10.1016/j.cjche.2024.10.013","DOIUrl":"10.1016/j.cjche.2024.10.013","url":null,"abstract":"<div><div>Lignin has been proved to be a promising precursor for producing carbon foam. The thermal and chemistry properties of lignin during its thermal conversion make it quite unique comparing with other precursors, and the conversion parameters can clearly affect the properties of the derived products. Therefore, this study systematically investigated the effects of key carbonization parameters on the properties of the resulting carbon foam materials. The findings demonstrate that the performance of the self-shaping lignin-derived carbon foam is simultaneously influenced by the factors that carbonization temperature, heating rate, and carbonization duration. Specifically, the carbonization temperature and carbonization duration have a significant impact on the mechanical performance, where higher temperatures and long carbonization time improve compressive strength and specific strength. Moreover, the data revealed that elevated temperatures, rapid heating rates, and shortened carbonization periods collectively promoted the development of higher porosities and larger pore diameters within the carbon foam structure. Conversely, lower carbonization temperatures, slower heating rates, and extended carbonization durations facilitated the formation of microporous in the carbon foam. This study provides a scientific foundation for optimizing the production of lignin-derived carbon foam with tailored properties and performance characteristics.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 33-43"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133671","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}

{"title":"Heteropolyacid hosted to nano-silica catalyst for the oxidation of methacrolein","authors":"Gang Hu ,&nbsp;Qinqin Wang ,&nbsp;Mingyuan Zhu ,&nbsp;Lihua Kang","doi":"10.1016/j.cjche.2024.10.027","DOIUrl":"10.1016/j.cjche.2024.10.027","url":null,"abstract":"<div><div>In this study, a catalyst was synthesized using a two-step <em>in-situ</em> molecular beam epitaxy method to grow H₄PMo₁₁VO₄₀ (HPAV) on amination-treated SiO₂ nanoparticles, which served as both dopant and host agents. SiO₂ dopant was modified with (3-aminopropyl)triethoxysilane (APTS), facilitating the formation of ammonium ions that enhanced the overall positive charge. This modification enabled the effective dispersion and exposure of HPAV's active species and induced a structural transformation of HPAV from a triclinic to a cubic crystal phase. The two-step hosting growth process optimized the proportions of Cs⁺, H⁺ and NH₄⁺ antinuclear ions, thereby fine-tuning the synergistic catalysis of oxidation and acidity, as well as the oxidative sensitivity at HPAV catalytic interface. The resultant 8(HPAV)&amp;4(Cs₃PAV)-NH₂-SiO₂ catalyst achieved a methacrolein (MAL) conversion rate of 84% and a methacrylic acid (MAA) selectivity of 71%. Even after 10.5 h of reaction time, the catalyst retained its high dispersion, cubic crystal structure, and Keggin configuration, demonstrating stable catalytic performance over a continuous 200-h reaction period.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 150-162"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133770","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}

{"title":"CO2-gasification of corncob in a molten salt environment","authors":"Zhiying Feng,&nbsp;Kaifeng Liu,&nbsp;Tao Zhu,&nbsp;Dongfang Li,&nbsp;Xing Zhu","doi":"10.1016/j.cjche.2024.07.027","DOIUrl":"10.1016/j.cjche.2024.07.027","url":null,"abstract":"<div><div>Molten salt gasification is a promising technology for biomass conversion due to its advantages of superior heat transfer and the ability of utilizing solar energy to reduce carbon emission. In this study, the characteristics of corncob CO₂-gasification in molten salt environments is thoroughly investigated, and the approach of introducing Fe₂O₃ as catalyst to enhance the syngas yield is proposed. The results showed that the molten salts significantly promoted the conversion of corncob into gaseous products with very low tar and char yield. Compared to O₂ and H₂O atmospheres, utilizing CO₂ as gasifying agent enhanced the yield of gaseous products during the corncob gasification, especially the yields of CO and H₂. The introduction of Fe₂O₃ as a catalyst could further increase the yield of gaseous products and the cold gas efficiency (CGE), and the yield of syngas was increased into 2258.3 ml·g⁻¹ with a high CGE of 105.8% in 900 °C. The findings evidenced that CO₂ gasification in the molten salt environment with Fe₂O₃ addition can promote the cracking of tar, increasing the syngas yield significantly. Moreover, the energy required to drive the gasification process was calculated, and the total energy consumption was calculated as 16.83 GJ·t⁻¹. The study opened up a new solution for the biomass gasification, exhibiting a great potential in distributed energy or chemical systems.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 58-66"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133776","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}

{"title":"Thermal coupling study during the co-processing of coal and biomass in the lab-scale adiabatic reactor","authors":"Laisong Wang,&nbsp;Zhidi Du,&nbsp;Jie Feng,&nbsp;Xiaolong Shi,&nbsp;Wenying Li","doi":"10.1016/j.cjche.2024.10.018","DOIUrl":"10.1016/j.cjche.2024.10.018","url":null,"abstract":"<div><div>A lab-scale adiabatic reactor has been self-made to characterize the coupled properties of heat and reactions during the co-thermal-processing of coal and biomass with steam or steam/O₂ gasification agents. Results showed that the synergistic effects caused by heat transfer between corncob and coal at different mixing ratios were heavily determined by coal rank and gasification agent. During steam co-processing, the heat transfer from corncob char to adjacent bituminous coal char promoted the water-gas reaction on coal char and contributed to synergistic effects; the heat transfer from anthracite char to adjacent corncob char reduced the kinetic rate of the water-gas reaction on coal char and contributed to inhibitory effects, and the inhibitory effect caused by heat transfer was greater than the promotion effects of biomass mass transfer. The introduction of O₂ diminished the impact of inter-particle heat transfer and altered the intensity of synergy, decreasing the values of synergy factor of bituminous coal/corncob blends by 17% and increasing the value of synergy factor of anthracite/corncob blends by 142.5%. This study provides sufficient support for the process conditions selection for the production of syngas with specific H₂/CO molar ratios and the desired level of gasification performance.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 303-313"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134296","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}

{"title":"A parallel chemical reaction optimization method based on preference-based multi-objective expected improvement","authors":"Mingqi Jiang ,&nbsp;Zhuo Wang ,&nbsp;Zhijian Sun ,&nbsp;Jian Wang","doi":"10.1016/j.cjche.2024.11.004","DOIUrl":"10.1016/j.cjche.2024.11.004","url":null,"abstract":"<div><div>Optimizing chemical reaction parameters is an expensive optimization problem. Each experiment takes a long time and the raw materials are expensive. High-throughput methods combined with the parallel Efficient Global Optimization algorithm can effectively improve the efficiency of the search for optimal chemical reaction parameters. In this paper, we propose a multi-objective populated expectation improvement criterion for providing multiple near-optimal solutions in high-throughput chemical reaction optimization. An l-NSGA2, employing the Pseudo-power transformation method, is utilized to maximize the expected improvement acquisition function, resulting in a Pareto solution set comprising multiple designs. The approximation of the cost function can be calculated by the ensemble Gaussian process model, which greatly reduces the cost of the exact Gaussian process model. The proposed optimization method was tested on a S_NAr benchmark problem. The results show that compared with the previous high-throughput experimental methods, our method can reduce the number of experiments by almost half. At the same time, it theoretically enhances temporal and spatial yields while minimizing by-product formation, potentially guiding real chemical reaction optimization.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 82-92"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133773","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}

{"title":"Advances in the preparation process and mechanism study of high-purity anhydrous magnesium chloride from magnesium chloride hexahydrate","authors":"Hui Ming ,&nbsp;Xudong Zhang ,&nbsp;Xinping Huang ,&nbsp;Lihua Cheng ,&nbsp;Libo Zhang","doi":"10.1016/j.cjche.2024.10.016","DOIUrl":"10.1016/j.cjche.2024.10.016","url":null,"abstract":"<div><div>In the extraction of potassium from salt lakes, Mg is abundant in the form of bischofite (MgCl₂·6H₂O), which is not utilized effectively, resulting in the waste of resources and environmental pressure. Anhydrous MgCl₂ prepared by the dehydration of bischofite is a high-quality raw material for the production of Mg. However, direct calcination of MgCl₂·6H₂O in industrial dehydration processes leads to a large amount of hydrolysis. The by-products are harmful to the electrolysis process of Mg, causing problems such as sludge formation, low current efficiency, and corrosion in the electrodes. To obtain high-purity anhydrous MgCl₂, different advanced dehydration processes have been proposed. In this review, we focus on the recent progress of the dehydration process. Firstly, we discuss the molecular structure of MgCl₂·6H₂O and explain the reason why much hydrolysis occurs in dehydration. Secondly, we introduce the specific dehydration processes, mainly divided into direct dehydration processes and indirect dehydration processes. The direct dehydration processes are classified into gas protection heating and molecular sieve dehydration process. Indirect dehydration processes are classified into thermal dehydration of ammonium carnallite (NH₄Cl·MgCl₂·6H₂O), thermal dehydration of potassium carnallite (KCl·MgCl₂·6H₂O), thermal decomposition of the [HAE]Cl·MgCl₂·6H₂O, organic solvent distillation, ionic liquid dehydration process and ammonia complexation process. In the meanwhile, purity of anhydrous MgCl₂ of each dehydration process, as well as the advantages and disadvantages, is discussed. The characteristics of different processes with a simple economic budget are also given in this paper. Finally, the main challenges are evaluated with suggested directions in the future, aiming to guide the synthesis of high-purity anhydrous MgCl₂.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"78 ","pages":"Pages 1-23"},"PeriodicalIF":3.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133779","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}