Chinese Journal of Chemical Engineering最新文献

Electrochemically reconstructed copper-polypyrrole modified graphite felt electrodes for efficiently electrocatalytic reduction of nitrate 电化学重建铜-聚吡咯改性石墨毡电极的高效电催化还原硝酸盐

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.04.005

Ge Liu , Jiahong Wang , Zhi Hu , Tianjiao Lu , Hao Zhang , Jie Zhu

{"title":"Electrochemically reconstructed copper-polypyrrole modified graphite felt electrodes for efficiently electrocatalytic reduction of nitrate","authors":"Ge Liu , Jiahong Wang , Zhi Hu , Tianjiao Lu , Hao Zhang , Jie Zhu","doi":"10.1016/j.cjche.2025.04.005","DOIUrl":"10.1016/j.cjche.2025.04.005","url":null,"abstract":"<div><div>In this work, a simple two-step electrodeposition was employed to prepare PPy-Cu/GF (PPy, polypyrrole; GF, graphite felt) composite cathodes for the nitrate reduction. Characterized results revealed that the introduction of PPy as an intermediate layer resulted in the transformation of both granular and dendritic Cu in form of Cu<sup>+</sup>/Cu<sup>0</sup>, Cu<sup>2+</sup> on the electrode surface. The <span><math><mrow><msup><msub><mtext>NO</mtext><mn>3</mn></msub><mo>−</mo></msup></mrow></math></span>-N of 50 mg·L<sup>−1</sup> was almost completely removed (99.01%) using the PPy-Cu/GF cathode under the optimum condition, which is obviously higher than the GF, PPy/GF and Cu/GF electrodes. <span><math><mrow><msup><msub><mtext>NO</mtext><mn>3</mn></msub><mo>−</mo></msup></mrow></math></span>-N removal was slightly affected over the pH scale of 3.0–11.0, whereas increasing the current density from 10 to 25 mA·cm<sup>−2</sup> boosted the reduction of <span><math><mrow><msup><msub><mtext>NO</mtext><mn>3</mn></msub><mo>−</mo></msup></mrow></math></span>-N. At a Cl<sup>−</sup> concentration of 2000 mg·L<sup>−1</sup>, the removal of <span><math><mrow><msup><msub><mtext>NO</mtext><mn>3</mn></msub><mo>−</mo></msup></mrow></math></span>-N was slightly reduced, while the selectivity for N<sub>2</sub> increased dramatically due to the active chlorine could oxidize <span><math><mrow><msup><msub><mtext>NH</mtext><mn>4</mn></msub><mo>+</mo></msup></mrow></math></span>-N to N<sub>2</sub>. Meanwhile, PPy-Cu/GF cathode exhibits an average removal rate of 97.83% within 12 cycles, highlighting its potential for application in actual water bodies. The EPR analysis and the active species trapping experiment confirmed that the nitrate reduction on the PPy-Cu/GF cathode mainly relies on direct reduction mediated by electron transfer, while <sup>∗</sup>H influences the reduction of nitrite to ammonia.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 51-61"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571432","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

Eulerian-Lagrangian simulation of dispersed liquid flow in turbulent stirred tanks 湍流搅拌槽中分散液体流动的欧拉-拉格朗日模拟

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.03.004

Jingchang Zhang , Xiaoping Guan , Ning Yang , Maximilian Lackner

{"title":"Eulerian-Lagrangian simulation of dispersed liquid flow in turbulent stirred tanks","authors":"Jingchang Zhang , Xiaoping Guan , Ning Yang , Maximilian Lackner","doi":"10.1016/j.cjche.2025.03.004","DOIUrl":"10.1016/j.cjche.2025.03.004","url":null,"abstract":"<div><div>Liquid-liquid dispersion is often performed in stirred tanks, which are valued for their ease of operation, high droplet generation rate and effective droplet dispersion. Many relevant simulations use the Eulerian-Eulerian method, combining population balance equations with statistical models to forecast droplet breakage. Conversely, the Eulerian-Lagrangian (E-L) method provides precise tracking of individual droplets, which is crucial for simulating dispersion processes. However, E-L simulation faces challenges in integrating droplet breakage effectively. To address this issue, our research introduces a probabilistic approach for droplet breakages. It assumes that a longer time increases the likelihood of breakup; a droplet breaks if the calculated probability exceeds a random value from 0 to 1. Consequently, the simulated breakage frequency becomes independent of the Lagrangian time step. The Sauter mean diameter and droplet size distribution can be accurately predicted by this probabilistic approach. By closely monitoring droplet motion, we reveal the complexity of droplet trajectories and the detailed patterns of circulation in stirred tanks. These insights contribute to a deeper understanding of liquid-liquid dispersion dynamics.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 182-190"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605239","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

Combined micromixing and coalescence separation for improved oil desulfurization 微混合与聚结分离相结合改善石油脱硫

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.02.019

Yaohua Huang, Huatong Zhu, Heping Wu, Lele Zhang, Hao Lu, Qiang Yang

引用次数: 0

Randomized autoregressive dynamic slow feature analysis method for industrial process fault monitoring 工业过程故障监测的随机自回归动态慢特征分析方法

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.03.006

Qingmin Xu , Peng Li , Aimin Miao , Xun Lang , Hancheng Wang , Chuangyan Yang

{"title":"Randomized autoregressive dynamic slow feature analysis method for industrial process fault monitoring","authors":"Qingmin Xu , Peng Li , Aimin Miao , Xun Lang , Hancheng Wang , Chuangyan Yang","doi":"10.1016/j.cjche.2025.03.006","DOIUrl":"10.1016/j.cjche.2025.03.006","url":null,"abstract":"<div><div>Kernel-based slow feature analysis (SFA) methods have been successfully applied in the industrial process fault detection field. However, kernel-based SFA methods have high computational complexity as dealing with nonlinearity, leading to delays in detecting time-varying data features. Additionally, the uncertain kernel function and kernel parameters limit the ability of the extracted features to express process characteristics, resulting in poor fault detection performance. To alleviate the above problems, a novel randomized auto-regressive dynamic slow feature analysis (RRDSFA) method is proposed to simultaneously monitor the operating point deviations and process dynamic faults, enabling real-time monitoring of data features in industrial processes. Firstly, the proposed Random Fourier mapping-based method achieves more effective nonlinear transformation, contrasting with the current kernel-based RDSFA algorithm that may lead to significant computational complexity. Secondly, a randomized RDSFA model is developed to extract nonlinear dynamic slow features. Furthermore, a Bayesian inference-based overall fault monitoring model including all RRDSFA sub-models is developed to overcome the randomness of random Fourier mapping. Finally, the superiority and effectiveness of the proposed monitoring method are demonstrated through a numerical case and a simulation of continuous stirred tank reactor.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 298-314"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665874","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

Synergetic mechanism between corn stalk biochar and coal pulping in coal-water slurry 玉米秸秆生物炭与水煤浆制浆的协同作用机理

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.03.011

Gaohan Li , Lirui Mao , Ling Zhang, Qiaoli Wu, Hanxu Li

{"title":"Synergetic mechanism between corn stalk biochar and coal pulping in coal-water slurry","authors":"Gaohan Li , Lirui Mao , Ling Zhang, Qiaoli Wu, Hanxu Li","doi":"10.1016/j.cjche.2025.03.011","DOIUrl":"10.1016/j.cjche.2025.03.011","url":null,"abstract":"<div><div>The multipath application of green resources needs to be realised under the carbon neutrality goal. Worldwide, biomass is a resource in urgent need of treatment. In this paper, corn stover biomass (YM) or biochar with different particle sizes (YMF or YMX) was added during the preparation of coal-water slurry to investigate its effect on the performance of coal-water slurry and the micro-mechanism. The results showed that the fixed viscosity concentration of coal-water slurry (CYWS) with YM was only 47.42%, and the flowability was 49.9 mm, which made the slurry performance poor. The fixed viscosity concentration of coal-water slurry (CFWS) blended with YMF and coal-water slurry (CXWS) blended with YMX increased by 10.41% and 14.24%, respectively, compared with CYWS. Meanwhile, CXWS had the lowest thixotropy and yield stress, with a yield stress of only 16.13 Pa, which was 77.31 Pa lower than that of CYWS. This indicates that YMX treated by charring and milling is more favorable to be blended with coal to prepare coal-water slurry. This is due to the enhanced hydrophilicity and electronegativity of YMX. The enhanced hydrophilicity reduces the tendency to form three-dimensional networks in coal-water slurry, while the enhanced electronegativity improves the electrostatic repulsion between particles, which is beneficial to the dispersion of particles. In the subsequent EDLVO analyses, the same idea was proved.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 1-14"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514423","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

Separation of chlorine–bromine-based solid solution in bittern tail solution by phase equilibrium 相平衡法分离卤尾液中氯-溴基固溶体

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.03.009

Yulong Zhang , Hongchao Yue , Yanru Zhang , Yun Li , Hongfei Guo , Dong Xu , Jilin Cao

引用次数: 0

Efficient hydrogen evolution from Amberlyst-15 mediated hydrolysis of ammonia borane under mild conditions 温和条件下Amberlyst-15介导的氨硼烷水解的高效析氢

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.02.030

Yilun Dong , Kang Xue , Zexing He , Chongjun Li , Ruijie Gao , Zhenfeng Huang , Chengxiang Shi , Xiangwen Zhang , Lun Pan , Jijun Zou

{"title":"Efficient hydrogen evolution from Amberlyst-15 mediated hydrolysis of ammonia borane under mild conditions","authors":"Yilun Dong , Kang Xue , Zexing He , Chongjun Li , Ruijie Gao , Zhenfeng Huang , Chengxiang Shi , Xiangwen Zhang , Lun Pan , Jijun Zou","doi":"10.1016/j.cjche.2025.02.030","DOIUrl":"10.1016/j.cjche.2025.02.030","url":null,"abstract":"<div><div>The efficient and cost-effective implementation of ammonia borane (AB) hydrolysis dehydrogenation for hydrogen storage is crucial. This study investigated the role of solid acid Amberlyst-15 (A-15) for hydrogen evolution from AB hydrolysis. Notably, AB hydrogen evolution rate can reach 194.15 ml·min<sup>−1</sup> at 30 °C, with a low apparent activation energy of 8.20 kJ·mol<sup>−1</sup>. After five cycles of reuse, the reaction involving A-15 could keep a conversion rate of about 93%. The AB hydrolysis follows quasi first-order kinetics with respect to the AB concentration and quasi zero-order kinetics with respect to the A-15 mass. According to the characterization results of XRD, ATR-FTIR, and <em>in-situ</em> MS, the boric acid was the dominant hydrolyzate, while water as a hydrogen donor in this reaction. Furthermore, based on the reasoning that hydrogen bonds between A-15 and AB (aq) promotes the diffusion of AB, release of H<sub>2</sub> and the cleavage of O—H bond of H<sub>2</sub>O, a possible mechanism was proposed.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 217-228"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614040","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 reaction pathways and kinetics in the gas-phase noncatalytic oxidation of hexafluoropropylene 六氟丙烯气相非催化氧化反应途径及动力学研究

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.02.023

Xintuo Chen , Wencong Chen , Yu Zhou , Liangliang Zhang , Jianfeng Chen

{"title":"Investigation of reaction pathways and kinetics in the gas-phase noncatalytic oxidation of hexafluoropropylene","authors":"Xintuo Chen , Wencong Chen , Yu Zhou , Liangliang Zhang , Jianfeng Chen","doi":"10.1016/j.cjche.2025.02.023","DOIUrl":"10.1016/j.cjche.2025.02.023","url":null,"abstract":"<div><div>Hexafluoropropylene oxide (HFPO) is a crucial fluorinated chemical mainly synthesized from hexafluoropropylene (HFP) through the oxidation of oxygen. However, the reaction network and kinetic characteristics are not fully understood yet, resulting in a lack of theoretical basis for synthesis process improvement. Here, the free radical reaction mechanism and complete reaction network involved in the noncatalytic oxidation of HFP to synthesize HFPO was explored by density functional theory. Transition state theory was employed to calculate the intrinsic reaction rate constants for elementary reactions. Based on theoretical reaction rate ratios, reaction pathways were selected, and a simplified reaction network was derived. It was found that byproducts were formed owing to the decomposition of HFPO and subsequent reactions with excessive oxygen while oxygen tended to participate more in the main reaction under oxygen-deficient conditions. The variations in reaction pathways occurring at different HFP/oxygen molar ratios was well elucidated by comparing with experimental data. This research establishes a robust theoretical foundation for optimizing and regulating the synthesis of HFPO.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 286-297"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631143","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

Biomass-derived nitrogen-doped porous carbon as a sustainable flow-electrode material for enhanced capacitive deionization 生物质衍生的氮掺杂多孔碳作为增强电容去离子的可持续流动电极材料

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.04.001

Hongyang Liu , Li Zhang , Jiali Cai , Siyu Liu , Cuijiao Zhao , Shuyu Wang , Mengyu Zhao , Menglong Liu , Wenwen Ding , Hongjian Zhou , Weiji Dai , Saifang Huang

{"title":"Biomass-derived nitrogen-doped porous carbon as a sustainable flow-electrode material for enhanced capacitive deionization","authors":"Hongyang Liu , Li Zhang , Jiali Cai , Siyu Liu , Cuijiao Zhao , Shuyu Wang , Mengyu Zhao , Menglong Liu , Wenwen Ding , Hongjian Zhou , Weiji Dai , Saifang Huang","doi":"10.1016/j.cjche.2025.04.001","DOIUrl":"10.1016/j.cjche.2025.04.001","url":null,"abstract":"<div><div>Freshwater scarcity has emerged as a critical global environmental challenge. Flow-electrode capacitive deionization (FCDI) represents a promising technology for achieving efficient and low-energy seawater desalination. This study presents a novel flow-electrode material, nitrogen-doped porous carbon (NPC), which is derived from biomass and demonstrates both cost-effectiveness and high performance. The NPC material is synthesized from bean shells through high-temperature pre-carbonization followed by activation with KHCO<sub>3</sub>, resulting in a rich porous structure, increased specific surface area, and high graphitization degree, which collectively confer superior capacitance performance compared to activated carbon (AC). Desalination experiments indicate that the FCDI performance of the NPC flow-electrode surpasses that of the AC flow-electrode. Specifically, at a voltage of 2.5 V in a 6 g·L<sup>−1</sup> NaCl solution, the NPC system achieves an average salt removal rate (ASRR) of 104.9 μg·cm<sup>−2</sup>·min<sup>−1</sup>, with a charge efficiency (CE) of 94.0% and an energy consumption (EC) of only 4.4 kJ·g<sup>−1</sup>. Furthermore, the NPC-based FCDI system exhibits commendable desalination cycling stability, maintaining relatively stable energy consumption and efficiency after prolonged continuous desalination cycles. This research holds significant implications for the advancement of environmentally friendly, low-cost, high-performance FCDI systems for large-scale applications.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 244-253"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614487","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

Stochastic analysis in gas–solid two-phase flow in the dense-phase pneumatic conveying of pulverized coal 煤粉密相气力输送中气固两相流的随机分析

IF 3.7 3区工程技术

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI: 10.1016/j.cjche.2025.04.002

Yong Jin , Weizhong Gu

{"title":"Stochastic analysis in gas–solid two-phase flow in the dense-phase pneumatic conveying of pulverized coal","authors":"Yong Jin , Weizhong Gu","doi":"10.1016/j.cjche.2025.04.002","DOIUrl":"10.1016/j.cjche.2025.04.002","url":null,"abstract":"<div><div>The complex dense-phase pneumatic conveying of pulverized coal process was studied using an electrical capacitance tomography (ECT) signal that represented the motion characteristics of gas–solid two-phase flow. The fluctuation characteristics of conveying process signals are inseparable from the flow pattern. The denoised ECT signal and noise signal were obtained by db2 wavelet analysis. It was found that all noise signals were white Gaussian noise. Based on the assumption of the equal probability distribution of pulverized coal concentration, this paper proved that the time series distribution of pulverized coal concentration in the pipeline should obey the normal distribution. Furthermore, through the analysis of the distribution characteristics of the power spectral density function of denoised ECT signals of four flow patterns, they were <em>α</em>-dimensional fractal Brownian motion (fBm) signals, and the parameter <em>α</em> was estimated by the detrended fluctuation analysis. Based on the fBm characteristics of denoised ECT signals and white Gaussian noise, this paper proposed a method for calculating the pulverized coal concentration in the dense-phase pneumatic conveying. In addition to the method of concentration estimation with the significance of engineering guidance, this research can help people to further understand essential characteristics of ECT signals in the dense-phase pneumatic conveying.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"83 ","pages":"Pages 26-37"},"PeriodicalIF":3.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563639","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