Chinese Journal of Chemical Engineering最新文献_第8页

Adsorption process for purifying vanadium from chromium-contaminated leaching solutions using zirconium-based adsorbents 锆基吸附剂对铬污染浸出液中钒的吸附工艺研究

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-08 DOI: 10.1016/j.cjche.2025.01.008

Biao Yuan , Fujin Sun , Pingting Chen , Kunpeng He , Pan Wu , Changjun Liu , Jian He , Wei Jiang

{"title":"Adsorption process for purifying vanadium from chromium-contaminated leaching solutions using zirconium-based adsorbents","authors":"Biao Yuan , Fujin Sun , Pingting Chen , Kunpeng He , Pan Wu , Changjun Liu , Jian He , Wei Jiang","doi":"10.1016/j.cjche.2025.01.008","DOIUrl":"10.1016/j.cjche.2025.01.008","url":null,"abstract":"<div><div>With the development of vanadium redox flow battery technology, the demand for pure vanadium is rapidly increasing. The separation of vanadium from vanadium–chromium leaching solutions are critical step in the production of purity-vanadium. This study presents an innovative adsorption process that utilizes amorphous ZrO<sub>2</sub> (AZrO) for the selective separation of V(V) and Cr(VI). In this process, a high adsorption capacity for V(V) at 64.5 mg·g<sup>−1</sup> was achieved, while the capacity for Cr(VI) is relatively low at 24.1 mg·g<sup>−1</sup>, demonstrating good separation performance. This is mainly caused by the large specific surface area and mesoporous structure, which are favorable for molecular diffusion and mass transfer. The kinetic analysis shows that the adsorption process follows pseudo-second-order kinetic process with chemisorption being the rate-controlling process. AZrO showed excellent separation performance in mixed solutions over a wide range of concentrations. After five cycles, AZrO retained over 73% of its capacity, indicating good stability. In mixed solutions containing up to 40 g·L<sup>−1</sup> of V(V) and 3 g·L<sup>−1</sup> of Cr(VI), the innovative adsorption process successfully achieved effective separation and purification. By an adsorption–desorption process using 0.1 mol·L<sup>−1</sup> NaOH, a 99.02% V(V)-rich solution was obtained from a high concentration sodium vanadium slag leaching solution, demonstrating its effectiveness for practical industrial applications.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"82 ","pages":"Pages 125-137"},"PeriodicalIF":3.7,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134478","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

Evaluation of live Cryo-ECT system for liquid nitrogen–vapor nitrogen flow 液氮-蒸气氮流动的冷冻电痉挛系统评价

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-08 DOI: 10.1016/j.cjche.2025.02.010

Zenan Tian , Zhiyu Zhang , Xiang Li , Xinxin Gao , Ziru Ren , Xiaobin Zhang

{"title":"Evaluation of live Cryo-ECT system for liquid nitrogen–vapor nitrogen flow","authors":"Zenan Tian , Zhiyu Zhang , Xiang Li , Xinxin Gao , Ziru Ren , Xiaobin Zhang","doi":"10.1016/j.cjche.2025.02.010","DOIUrl":"10.1016/j.cjche.2025.02.010","url":null,"abstract":"<div><div>A cryogenic visible calibration and image evaluation facility (VCCIEF) was constructed to assess the effectiveness of electrical capacitance tomography systems in cryogenic conditions, known as Cryo-ECT. This facility was utilized to conduct dynamic, real-time imaging trials with liquid nitrogen (LN2). The actual flow patterns were captured using a camera and contrasted with the imaging outcomes. The capacitance data collected from these experiments were subsequently processed using three distinct methods: linear back projection, Landweber iteration, a fully connected deep neural network, and a convolutional neural network. This allowed for a comparative analysis of the performance of these algorithms in practical scenarios. The findings from the LN2 experiments demonstrated that the Cryo-ECT system, when integrated with the VCCIEF, was capable of successfully executing calibration, generating flow patterns, and performing imaging tasks. The system provided observable, clear, and precise phase distributions of the liquid nitrogen–vaporous nitrogenflow within the pipeline.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"82 ","pages":"Pages 246-255"},"PeriodicalIF":3.7,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167818","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

Improvement on the distribution uniformity of hydrodynamics in a stirred tank with an H-like fractal impeller h形分形叶轮改善搅拌槽内流体力学分布均匀性

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-07 DOI: 10.1016/j.cjche.2025.01.004

Hui Li , Pan You , Xiaoyang Chen , Huiming Yang , Peicheng Luo

{"title":"Improvement on the distribution uniformity of hydrodynamics in a stirred tank with an H-like fractal impeller","authors":"Hui Li , Pan You , Xiaoyang Chen , Huiming Yang , Peicheng Luo","doi":"10.1016/j.cjche.2025.01.004","DOIUrl":"10.1016/j.cjche.2025.01.004","url":null,"abstract":"<div><div>Fractal theory provides a new strategy for equipment design. In this work, we propose a novel H-like fractal (HLF) impeller to improve the uniformity of the distribution of hydrodynamics in stirred tanks. The impellers are constructed by replacing two vertical blades or four legs with two or four H-like sub-blades by fractal iterations, respectively. Flow characteristics including velocity and turbulent kinetic energy (TKE) distributions, vortices, power number, are predicted by large eddy simulation. Compared with Rushton turbine (RT) impeller when <em>H</em>/<em>T</em> = 1 (or dual RTs when <em>H</em>/<em>T</em> = 1.5, triple RTs when <em>H</em>/<em>T</em> = 2), the HLF impeller can produce a flow field with more uniform distributions of larger velocities and TKE level. The impeller with more fractal iteration times can further improve the distribution uniformity of hydrodynamics in the case of high <em>H</em>/<em>T</em>. Power analysis shows that this is mainly due to the improved energy utilization efficiency by the fractal structure design.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"82 ","pages":"Pages 83-94"},"PeriodicalIF":3.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123319","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

Enrichment and purification of nervonic acid from Acer truncatum seed oil by combining vacuum distillation and low-temperature crystallization: Experiments and process modeling 真空蒸馏与低温结晶相结合富集纯化槭仁油神经酸：实验与工艺模拟

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-07 DOI: 10.1016/j.cjche.2024.09.035

Yingxi Gao , Tong Wei , Jie Wang , Yuming Tu , Zhiyong Zhou , Chencan Du , Zhongqi Ren

{"title":"Enrichment and purification of nervonic acid from Acer truncatum seed oil by combining vacuum distillation and low-temperature crystallization: Experiments and process modeling","authors":"Yingxi Gao , Tong Wei , Jie Wang , Yuming Tu , Zhiyong Zhou , Chencan Du , Zhongqi Ren","doi":"10.1016/j.cjche.2024.09.035","DOIUrl":"10.1016/j.cjche.2024.09.035","url":null,"abstract":"<div><div>Nervonic acid (NA) is a long-chain monounsaturated fatty acid with significant potential for neural fiber repair. In this study, a mixed fatty acid methyl ester was synthesized as the raw material through saponification of <em>Acer truncatum</em> Bunge seed oil. Based on the differences in boiling points and relative volatilities of various components, a four-stage vacuum batch distillation process was employed to enrich the nervonic acid methyl ester (NAME). The effect of distillation process parameters on enrichment efficiency was investigated, including distillation temperature, operating pressure, and reflux ratio. The purity of NAME achieved as 91.20% under optimal conditions and the corresponding yield was 48.91%. To further increase the purity, a low-temperature crystallization process was adopted and a final purity of NAME was obtained as 97.56%. Simulation of the above four-stage batch distillation was conducted using Aspen Plus software, and a continuous distillation processes was further simulated to establish a theoretical basis for future industrial-scale production. The results of experiments and simulation demonstrate that the integrated process of vacuum distillation and low-temperature crystallization exhibits remarkable separation performances, providing robust guidance for the production of high-purity NA.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"82 ","pages":"Pages 116-124"},"PeriodicalIF":3.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134528","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

Catalytic oxidation of methane for methanol production over copper sepiolite: Effect of noble metals 铜海泡石上甲烷催化氧化制甲醇：贵金属的影响

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-05 DOI: 10.1016/j.cjche.2025.02.006

Mingqiang Chen , Tingting Zhu , Yishuang Wang , Defang Liang , Chang Li , Haosheng Xin , Jun Wang

{"title":"Catalytic oxidation of methane for methanol production over copper sepiolite: Effect of noble metals","authors":"Mingqiang Chen , Tingting Zhu , Yishuang Wang , Defang Liang , Chang Li , Haosheng Xin , Jun Wang","doi":"10.1016/j.cjche.2025.02.006","DOIUrl":"10.1016/j.cjche.2025.02.006","url":null,"abstract":"<div><div>The direct oxidation of methane to methanol (DOMM) has been recognized as a significant technology for efficiently utilizing low-concentration coalbed methane (LCMM) and supplying liquid fuel. Herein, the noble metals (Pt, Pd and Ru) modified Cu/alkalized sepiolite (CuX/SEPA) catalysts were prepared and used for the DOMM in a gas-phase system at low temperatures. The CuRu/SEPA exhibited the highest methanol production of 53 μmol·g<sup>−1</sup>·h<sup>−1</sup> and methanol selectivity of 90% under the optimal reaction conditions. Various characterizations demonstrated that the addition of Ru promoted the formation of Cu<sup>2+</sup> and the contraction of Cu—Si/Al bonds to reduce the distance between framework Al atoms of SEPA to further generate more Al pairs, which facilitated the formation of reactive dicopper species ([Cu<sub>2</sub>O]<sup>2+</sup> or [Cu<sub>2</sub>O<sub>2</sub>]<sup>2+</sup>). Investigation of the reaction mechanism revealed that [Cu<sub>2</sub>O]<sup>2+</sup> or [Cu<sub>2</sub>O<sub>2</sub>]<sup>2+</sup> species could adsorb and activate methane to form CH<sub>3</sub>O∗ species and ultimately generated methanol with the assistance of water.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"82 ","pages":"Pages 1-14"},"PeriodicalIF":3.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123322","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

Comprehensive utilization of Titanium-bearing Blast Furnace Slag by H2SO4 Roasting and Stepwise Precipitation 硫酸焙烧分步沉淀法综合利用含钛高炉渣

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-05 DOI: 10.1016/j.cjche.2024.12.010

Siwen Huang , Kui Wang , Haibo Wang , Li Lv , Tao Zhang , Wenxiang Tang , Zongpeng Zou , Shengwei Tang

{"title":"Comprehensive utilization of Titanium-bearing Blast Furnace Slag by H2SO4 Roasting and Stepwise Precipitation","authors":"Siwen Huang , Kui Wang , Haibo Wang , Li Lv , Tao Zhang , Wenxiang Tang , Zongpeng Zou , Shengwei Tang","doi":"10.1016/j.cjche.2024.12.010","DOIUrl":"10.1016/j.cjche.2024.12.010","url":null,"abstract":"<div><div>Titanium-bearing blast furnace slag (Ti-BFS) is an industrial solid waste rich in titanium, magnesium and aluminum. However, it is difficult to utilize Ti, Mg and Al from Ti-BFS for the strong stability and poor reaction activity of Ti-BFS. A comprehensive utilization route of Ti, Mg and Al from Ti-BFS was proposed. Ti-BFS was firstly roasted with H<sub>2</sub>SO<sub>4</sub> to realizes the conversion of Ti, Mg and Al to their corresponding sulphates. The sulphates were leached by dilute H<sub>2</sub>SO<sub>4</sub> solution to extraction Ti, Mg and Al from roasted Ti-BFS. The roasting conditions were optimized as follows, sulfuric acid concentration of 85%(mass), temperature of 200 °C, acid-slag ratio of 5.5, particle size of Ti-BFS <75 μm, and reaction time of 1 h. The extraction rates of titanium, aluminum, and magnesium reached 82.42%, 88.78% and 90.53%, respectively. The leachate was hydrolyzed at 102 °C for 5 h with a titanium hydrolysis ratio of 96%. After filtration and calcination, TiO<sub>2</sub> with a purity of 97 %(mass) was obtained. Al in the leachate was converted to NH<sub>4</sub>Al(SO<sub>4</sub>)<sub>2</sub>·12H<sub>2</sub>O by the neutralization of ammonia water at pH = 4.5. Al<sub>2</sub>O<sub>3</sub> was obtained by the calcination of NH<sub>4</sub>Al(SO<sub>4</sub>)<sub>2</sub>·12H<sub>2</sub>O. The residual solution can be used to prepare products of magnesium sulfate. In the proposed process, Ti, Mg and Al were extracted from Ti-BFS and utilized comprehensively to prepare valuable products. The leaching behavior of roasted Ti-BFS with water was also studied. It followed the unreacted shrinking core model. The apparent activation energy was 26.07 kJ·mol<sup>−1</sup> . This research not only provides a viable method for recovering valuable metals in Ti-BFS, but also provides a strategy to comprehensive utilize the valuable elements in Ti-BFS.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"80 ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769289","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 degradation of chloramphenicol wastewater in a submerged rotating packed bed reactor: O3/PDS synergistic oxidation O3/PDS协同氧化强化淹没式旋转填料床反应器对氯霉素废水的降解

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-03 DOI: 10.1016/j.cjche.2024.12.008

Zhuolin Yang , Zhenyu Yang , Yanbin Li , Guangwen Chu , Jianfeng Chen

{"title":"Enhanced degradation of chloramphenicol wastewater in a submerged rotating packed bed reactor: O3/PDS synergistic oxidation","authors":"Zhuolin Yang , Zhenyu Yang , Yanbin Li , Guangwen Chu , Jianfeng Chen","doi":"10.1016/j.cjche.2024.12.008","DOIUrl":"10.1016/j.cjche.2024.12.008","url":null,"abstract":"<div><div>The large molecular weight and high hydrophilicity of chloramphenicol (CAP) residuals in wastewater led to severe degradation difficulty, which propelled the development of new wastewater degradation processes and reactors based on process intensification. This study enhanced the CAP degradation by ozone/peroxydisulfate (PDS) advanced oxidation process in a submerged rotating packed bed (SRPB) reactor. Compared the usage of different oxidants, it was indicated that the combination of O<sub>3</sub> and PDS exhibited a higher degradation efficiency than ozone and PDS alone. The more desired degradation efficiency could be achieved at the operating conditions of ascending PDS concentration, SRPB rotational speed, ozone concentration, reduced initial CAP concentration, and the water qualities of ascended pH, lower Cl<sup>−</sup> and initial CO<sub>3</sub><sup>2–</sup>concentrations. Under the optimized conditions of <em>C</em><sub>CAP</sub> = 20 mg·L<sup>−1</sup>, <em>C</em><sub>O<sub>3</sub></sub> = 30 mg·L<sup>−1</sup>, <em>C</em><sub>PDS</sub> = 100 mg·L<sup>−1</sup>, and <em>N</em> = 400 r·min<sup>−1</sup>, and water qualities of pH = 10, the maximum chloramphenicol degradation efficiency of 97% and kinetic constant of 0.23 min<sup>−1</sup> were achieved after treating 16 min. A comparison of the results with previously reported advanced oxidation processes of CAP indicated that the enhanced O<sub>3</sub>/PDS advanced oxidation system using the SRPB can significantly improve the degradation efficiency of CAP.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"82 ","pages":"Pages 176-184"},"PeriodicalIF":3.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138911","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

Dynamic temperature control of dividing wall batch distillation with middle vessel based on neural network soft-sensor and fuzzy control 基于神经网络软测量和模糊控制的中间容器分壁间歇精馏动态温度控制

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-01 DOI: 10.1016/j.cjche.2024.11.008

Xiaoyu Zhou , Erwei Song , Mingmei Wang, Erqiang Wang

{"title":"Dynamic temperature control of dividing wall batch distillation with middle vessel based on neural network soft-sensor and fuzzy control","authors":"Xiaoyu Zhou , Erwei Song , Mingmei Wang, Erqiang Wang","doi":"10.1016/j.cjche.2024.11.008","DOIUrl":"10.1016/j.cjche.2024.11.008","url":null,"abstract":"<div><div>Dividing wall batch distillation with middle vessel (DWBDM) is a new type of batch distillation column, with outstanding advantages of low capital cost, energy saving and flexible operation. However, temperature control of DWBDM process is challenging, since inherently dynamic and highly nonlinear, which make it difficult to give the controller reasonable set value or optimal temperature profile for temperature control scheme. To overcome this obstacle, this study proposes a new strategy to develop temperature control scheme for DWBDM combining neural network soft-sensor with fuzzy control. Dynamic model of DWBDM was firstly developed and numerically solved by Python, with three control schemes: composition control by PID and fuzzy control respectively, and temperature control by fuzzy control with neural network soft-sensor. For dynamic process, the neural networks with memory functions, such as RNN, LSTM and GRU, are used to handle with time-series data. The results from a case example show that the new control scheme can perform a good temperature control of DWBDM with the same or even better product purities as traditional PID or fuzzy control, and fuzzy control could reduce the effect of prediction error from neural network, indicating that it is a highly feasible and effective control approach for DWBDM, and could even be extended to other dynamic processes.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"79 ","pages":"Pages 200-211"},"PeriodicalIF":3.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580121","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

Effect of curing temperature of phthalonitrile resin on the properties of resultant hierarchical porous carbon 邻苯二腈树脂固化温度对所得分层多孔碳性能的影响

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-01 DOI: 10.1016/j.cjche.2024.11.016

Xing Yun , Kewen Zhang , Zhaojun Chu , Beitao Liu , Yan Kou , Xigao Jian , Zhihuan Weng

{"title":"Effect of curing temperature of phthalonitrile resin on the properties of resultant hierarchical porous carbon","authors":"Xing Yun , Kewen Zhang , Zhaojun Chu , Beitao Liu , Yan Kou , Xigao Jian , Zhihuan Weng","doi":"10.1016/j.cjche.2024.11.016","DOIUrl":"10.1016/j.cjche.2024.11.016","url":null,"abstract":"<div><div>Heteroatom-doped porous carbon materials have been widely studied due to their high specific surface area and high heteroatom content, but it is difficult to achieve high specific surface area and high heteroatom content at the same time. Herein, a simple method is introduced to prepare N/O co-doped hierarchical porous carbon materials (DNZKs). Phthalonitrile resins (DNZs) were prepared by using 1,3-<em>bis</em>(3,4-dicyanophenoxy)benzene as raw material and ZnCl<sub>2</sub>/urea as composite curing agent, and then using KOH as activator to successfully prepare DNZKs with high specific surface area, developed pores and high N/O content. The porous carbon material (DNZK@400) obtained at a curing temperature of 400 °C has the highest N content (4.97% (mass)), a large specific surface area (2026 m<sup>2</sup>·g<sup>−1</sup>), a high micropore proportion (0.9), a high O content (7.53% (mass)), and the best specific capacitance (up to 567 F·g<sup>−1</sup> at 0.1 A·g<sup>−1</sup>), which can be attribute to the high temperature resistance of the nitrogen-containing aromatic heterocyclic structure in DNZs. When the mass ratio of resin and KOH is 1:1, the specific capacitance of the sample tested by the acid three-electrode system is obtained, and it is found that the material has high cycling stability (119% specific capacitance retention after 100,000 cycle tests). This work proposes a simple and easy-to-operate method for the preparation of multifunctional porous carbon.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"79 ","pages":"Pages 45-52"},"PeriodicalIF":3.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549657","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

Research on fluid motion characteristics and structural evolution in reciprocating mixing tanks 往复搅拌槽内流体运动特性及结构演化研究

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-03-01 DOI: 10.1016/j.cjche.2024.12.001

Li Wang , Shibo Wang , Huiqiang Yang , Yuling Zhai , Jianxin Xu

{"title":"Research on fluid motion characteristics and structural evolution in reciprocating mixing tanks","authors":"Li Wang , Shibo Wang , Huiqiang Yang , Yuling Zhai , Jianxin Xu","doi":"10.1016/j.cjche.2024.12.001","DOIUrl":"10.1016/j.cjche.2024.12.001","url":null,"abstract":"<div><div>A new stirring method, reciprocating stirring, is developed by incorporating a periodic axial reciprocating motion into conventional stirring. This study employs computational fluid dynamics methods, utilizing volume of fluid and user-defined functions to control and analyze the flow field characteristics in a reciprocating stirred tank. Compared to conventional stirring, reciprocating stirring increases the overall fluid velocity by approximately 7.9%, turbulent kinetic energy (TKE) by 35.9% to 45.6%, and the turbulent dissipation rate by 10.6% to 15.7%. The primary reason is the dynamic integration of multiple flow regions, which enhances fluid interface interactions. Additionally, the study investigates the dynamic evolution of the vortex structure, uncovering the correlation between the impeller's start-stop behavior and the vortex area. The optimal impeller plate designs, forward sine-4/12<em>D</em> and reverse sine-5/12<em>D</em>, were determined based on the effective area of TKE. Reciprocating stirring, in comparison to conventional stirring, enhances secondary flow intensity by 67.3% to 93.7% and shortens mixing time by 56.6% to 173.0%.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"79 ","pages":"Pages 120-134"},"PeriodicalIF":3.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580110","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