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co.tinuous synthesis of N,N-dicyanoethylaniline in microreactors:Reaction kinetics and process intensification

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Chinese Journal of chemical Engineering 2024年第8期72卷 95-105页

作者： Pengcheng Lu Yaoyao Li Jianjun Zhang Yuchao Zhao Qingqiang Wang Ying Chen Nan Jin Xiugang Yu Shandong Provincial Key Laboratory of chemical Engineering and Process College of Chemistry and Chemical EngineeringYantai UniversityYantai 264005China Shandong ANOKY chemical Technology Research co. Ltd.Yantai 265601China Yantai Guobang chemical Machinery Technology co. Ltd.Yantai 264000China

Cyanoethylation of phenylamine is one of the important steps for the production of dicyanoethyl-based disperse ***,the exothermic nature of this reaction and the inherent instability of intermittent dynamic operation pose challenges in achieving both high safety and reaction *** this study,a co.tinuous cyanoethylation of phenylamine for synthesizing N,N-dicyanoethylaniline in a microreactor system has been *** optimizing the reaction co.ditions,the reaction time was significantly reduced from over 2 h in batch operation to approximately 14 min in the microreactor,while high co.version and selectivity were *** on the reaction network co.structed,the reaction kinetics was established,and the kinetic parameters were then *** findings provide valuable insights into a co.trollable cyanoethylation reaction,which would be helpful for the design of efficient processes and optimization of reactors.

关键词： Cyanoethylation Microreactor Kinetics N,N-dicyanoethylaniline Optimization Safety

Sulfur and carbon co.doped g-C_(3)N_(4)microtubes with enhanced photocatalytic H2 production activity

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Frontiers in Energy 2024年第1期18卷 110-121页

作者： Yang GE Quanhao SHEN Qi ZHANG Naixu LI Danchen LU Zhaoming ZHANG Zhiwei FU Jiancheng ZHOU School of Chemistry and chemical Engineering Southeast UniversityNanjing 211189China Shangdong Yellow Triangle Biotechnology Industry Research Institute co. Ltd.Dongying 257091China Xuzhou B&C chemical co. Ltd.Xuzhou 221300China

Metal-free graphitic carbon nitride(g-C_(3)N_(4))has captured significant attention as a low-co.t and efficient hydrogen production photocatalyst *** regulating the microstructure and accelerating the separation of photogenerated carriers remain crucial strategies for promoting the photocatalytic performance of this ***,a novel sulfur–carbon co.doped g-C_(3)N_(4)(SCCN)hierarchical microtubules filled with abundant nanosheets inside by thermal polymerization is *** nanosheets create abundant pores and cavities inside the SCCN microtubes,thereby increasing the specific surface area of g-C_(3)N_(4)and providing sufficient reactant attachment ***,the hierarchical structure of SCCN microtubules strengthens the reflection and scattering of light,and the utilization of visible light is favorably *** importantly,co.doping S and C has greatly improved the photocatalytic performance of graphitic carbon nitride,optimized the band gap structure and enhanced the photogenerated carrier ***,the SCCN exhibits a remarkable photocatalytic H_(2)evolution rate of 4868μmol/(g·h).This work demonstrates the potential of multi-nonmetal doped g-C_(3)N_(4)as the ideal photocatalyst for H2 evolution.

关键词： carbon nitride photocatalysis hydrogen production

Integrating Bimetallic Nanoparticles with co.alent Organic Frameworks as Multifunctional Nanozyme for co.orimetric Detection of Hydrogen Peroxide and Glutathione

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Journal of Analysis and Testing 2024年第3期8卷 278-287页

作者： Yuying Yuan Xiaoxue Xi Ting Bao Pingguan Bian Feng Pei Xiuhua Zhang Shengfu Wang Wei Wen co.laborative Innovation Center for Advanced Organic chemical Materials Co-constructed by the Province and Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional MoleculesCollege of Chemistry and Chemical EngineeringHubei University Hubei Yihua chemical co. Ltd

The co.trollable growth of metal nanoparticles on nanomaterials is beco.ing an effective strategy for developing nanoco.posites with designated performance. Herein, a simple and mild strategy for the in situ growth of Pt–Pd bimetallic nanoparticles on co.alent organic frameworks（co.s） to regulate the nanozyme activity was designed for co.orimetric detection of hydrogen peroxide（H2O2） and glutathione（GSH）. The co.s not only offer sufficient loading sites for the uniform dispersion of Pt–Pd bimetallic nanoparticles, but also increase the adsorption of substrate to promote the catalytic reaction. With the bimetallic synergistic effect of Pt–Pd nanoparticles, the prepared multifunctional nanozyme（Pt–Pd/co.s nanozyme） simultaneously exhibited superior peroxidase（POD）-like activity and oxidase（OXD）-like activity. Using the multifunctional nanozyme, a co.orimetric sensing system was co.structed for sensitive detection of H2O2and GSH, with the wide linear ranges of 5–1000 μmol/L and 1–40 μmol/L, and the detection limits were 1.14 μmol/L and 0.43 μmol/L, respectively. It was successfully used for the detection of real samples in environmental water and serum, providing a simple method for disease diagnosis and environmental monitoring.

关键词： Bimetallic synergistic effect H2O2 and GSH detection Oxidase-like activity Peroxidase-like activity Pt–Pd/co.s nanozyme

Design method of extractant for liquid-liquid extraction based on elements and chemical bonds

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Chinese Journal of chemical Engineering 2024年第4期68卷 193-202页

作者： Yuwen Wei Chunling Zhang Yue Zhang Lili Wang Li Xia Xiaoyan Sun Shuguang Xiang Institute of Process System Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Yantai Guobang chemical Machinery Technology co. Ltd.Yantai 264002China

In the petrochemical industry process, the relative volatility between the co.ponents to be separated is close to one or the azeotrope that systems are difficult to separate. Liquid-liquid extraction is a co.mon and effective separation method, and selecting an extraction agent is the key to extraction technology research. In this paper, a design method of extractants based on elements and chemical bonds was proposed. A knowledge-based molecular design method was adopted to pre-select elements and chemical bond groups. The molecules were automatically synthesized acco.ding to specific co.bination rules to avoid the problem of “co.bination explosion” of molecules. The target properties of the extractant were set, and the extractant meeting the requirements was selected by predicting the co.relation physical properties of the generated molecules. Based on the separation performance of the extractant in liquid-liquid extraction and the relative importance of each index, the fuzzy co.prehensive evaluation membership function was established, the analytic hierarchy process determined the mass ratio of each index, and the co.sistency test results were passed. The results of case study based on quantum chemical analysis demonstrated that effective determination of extractants for the analysis of benzene-cyclohexane systems. The results unanimously prove that the method has important theoretical significance and application value.

关键词： Molecular design Element and chemical bonds Molecular simulation Thermodynamics Solvent extraction

Recent advances in visible light-mediated chemical transformations of enaminones

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Chinese chemical Letters 2024年第2期35卷 4-15页

作者： Yu Han Liyun Zhou Chengyu Wang Shangti Feng Rong Ma Jie-Ping Wan co.lege of Chemistry and chemical Engineering Jiangxi Normal UniversityNanchang 330022China School of Chemistry and chemical Engineering Linyi UniversityLinyi 276000China Linyi Sanfeng chemical co. Ltd.Linyi 276000China

Enaminones,which possesses both the nucleophilic enamine as well as electrophilic enone structures,are well known versatile building blocks in organic ***,visible light-mediated reactions have emerged as useful synthetic strategy with enhanced *** the last decade,various photochemical transformations of enaminones have been developed to co.struct cyclic or acyclic *** this review,we describe the recent advances in visible light-mediated chemical transformations of *** discussion on the reaction mechanism of the related reactions is given to provide guide to the ***,a summary on the existing challenges and the future outlook towards the development of practical photocatalytic reactions of enaminones is also presented.

关键词： Enaminone Visible light C-H functionalization C=C bond cleavage Cyclization Multico.ponent reactions

Surface-state co.trolled synthesis of hydrophobic and hydrophilic carbon dots

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Nano Research 2024年第5期17卷 4391-4399页

作者： Chan Wang Yuan Fang Mi Zhang Huan Zhuo Qijun Song Han Zhu Key Laboratory of Synthetic and Biological co.loids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Jiangsu Snow Leopard Household chemical co. Ltd.Wuxi 214400China

It is of great significance to synthesize carbon dots(CDs)with desirable hydrophilicity for the ever-growing application of CDs in different *** this study,the hydrophilic and hydrophobic CDs were facilely prepared by solvothermal treatment of o-dihydroxybenzene and urea in N,N-dimethylformamide(DMF).Optimization experiments revealed that the solvothermal temperature has a great impact on the surface states of the *** hydrophobic CDs with a co.tact angle of 110.7°was obtained at 200℃.The structural and optical characterizations,along with theoretical calculations elucidated that the lipophilic nature of the CDs was resulting from the formation of polymer *** presence of extended co.jugated sp^(2)-domains and amino groups co.tributed to the red emission of the CDs synthesized at low reaction temperatures(160-200℃).With the further increase of solvothermal temperature,the hydrophobic CDs were gradually transformed to the hydrophilic state acco.panying the blue shift of the fluorescence of the *** highly hydrophilic CDs with a co.tact angle of 25.9°were obtained at 240℃ due to the increased formation of hydrophilic functional groups on the surface of *** red emissive CDs exhibited a sensitive co.or and fluorescence response to ethanol co.tent while the fluorescence of the blue emissive CDs remained *** co.bining the two kinds of CDs,a dual-emission sensor was co.structed,which was successfully applied for the evaluation of the alco.olic strength in co.mercial Baijiu co.modities in both fluorometric and co.orimetric modes.

关键词： carbon dots surface chemistry hydrophilicity and hydrophobicity solvothermal temperature alco.olic strength evaluation

Photocatalytic ozonation-based degradation of phenol by ZnO—TiO_(2)nanoco.posites in spinning disk reactor

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Chinese Journal of chemical Engineering 2024年第8期72卷 74-84页

作者： Xueqing Ren Jiahao Niu Yan Li Lei Li Chao Zhang Qiang Guo Qiaoling Zhang Weizhou Jiao Shanxi Province Key Laboratory of Higee-Oriented chemical Engineering School of Chemistry and Chemical EngineeringNorth University of ChinaTaiyuan 030051China Shanxi Sanqiang New Energy Technology co. LtdTaiyuan 030051China

Spinning disk reactor(SDR)has emerged as a novel process intensification photocatalytic reactor,and it has higher mass transfer efficiency and photon utilization for the degradation of toxic organic pollutants by advanced oxidation processes(AOPs).In this study,ZnO—TiO_(2)nanoco.posites were prepared by solgel method,and co.ted on the disk of SDR by impregnation-pull-drying-calcination *** performance of catalyst was characterized by X-ray diffraction,scanning electron microsco.e,X-ray photoelectron spectrosco.y,photoluminescence and ultraviolet—visible diffuse reflectance *** ozonation in SDR was used to remove phenol,and various factors on degradation effect were studied in *** results showed that the rate of degradation and mineralization reached 100%and 83.4%under UV light irradiation after 50 min,co.pared with photocatalysis and ozonation,the removal rate increased by 69.3%and 34.7%,and mineralization rate increased by 56.7%and 62.9%,which indicated that the co.pling of photocatalysis and ozonation had a synergistic *** radical capture experiments demonstrated that the active species such as photogenerated holes(h^(+)),hydroxyl radicals(·OH),superoxide radical(·O_(2)-)were responsible for phenol degradation,and·OH played a leading role in the degradation process,while h+and·O_(2)^(-)played a non-leading role.

关键词： Spinning disk reactor Photocatalytic ozonation ZnO-TiO_(2)nanoco.posites Advanced oxidation processes

A method for establishing a bearing residual life prediction model for process enhancement equipment based on rotor imbalance response analysis

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Chinese Journal of chemical Engineering 2024年第2期66卷 203-215页

作者： Feng Wang Haoran Li Zhenghui Zhang Yan Bai Hong Yin Jing Bian National Foundation Research Laboratory of Fault Prevention and co.trol in Hazardous chemicals Production System Engineering Research Center of Chemical Technology SafetyBeijing University of Chemical TechnologyBeijing 100029China China Nuclear Power Engineering co. LtdBeijing 100840China CNOOC Tianjin chemical Research and Design Institute co. LtdTianjin Key Laboratory of Energy and Chemical Explosion SafetyAcademician Expert Collaborative Innovation CenterTianjin 300131China

A rotating packed bed is a typical chemical process enhancement equipment that can strengthen micromixing and mass *** the operation of the rotating packed bed,the nonreactants and products irregularly adhere to the wire mesh packing in the rotor,thus resulting in an imbalance in the vibration of the rotor,which may cause serious damage to the bearing and material *** study proposes a model prediction for estimating the bearing residual life of a rotating packed bed based on rotor imbalance response *** method is used to determine the influence of the mass on the imbalance in the vibration of the rotor on bearing *** major influence on rotor vibration was found to be exerted by the imbalanced mass and its distribution radius,as revealed by the results of orthogonal *** implementing finite element analysis,the imbalance response curve for the rotating packed bed rotor was obtained,and a co.relation among rotor imbalance mass,distribution radius of imbalance mass,and bearing residue life was established via data *** predicted value of the bearing life can be used as the reference basis for an early safety warning of a rotating packed bed to effectively avoid accidents.

关键词： Rotating packed bed Mass imbalance Harmonic response analysis Residual life Prediction model

Design of highly active and durable oxygen evolution catalyst with intrinsic chlorine inhibition property for seawater electrolysis

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Nano Materials Science 2024年第4期6卷 413-418页

作者： Jieli Chen Xiaodong Shi Suyang Feng Jing Li Xiaohong Gao Xiao Wu Ke Li Anyuan Qi Chenghang You Xinlong Tian School of Marine Science and Engineering School of Chemical Engineering and Technology Hainan University National Energy Group Ledong Power Generation co. Ltd

High-efficiency seawater electrolysis is impeded by the low activity and low durability of oxygen evolution catalysts due to the co.plex co.position and co.petitive side reactions in ***,a heterogeneousstructured catalyst is co.structed by depositing NiFe-layered double hydroxides （NiFe-LDH） on the substrate of MXene （V2CTx） modified Ni foam （NF）,and abbreviated as NiFe-LDH/V2CTx/*** demonstrated,owing to the intrinsic negative charge characteristic of V2CTx,chlorine ions are denied entry to the interface between NiFeLDH and V2CTx/NF substrate,thus endowing NiFe-LDH/V2CTx/NF catalyst with high co.rosion resistance and durable stability for 110 h at 500 mA ***,the two-dimensional structure and high electrical co.ductivity of V2CTxcan respectively enlarge the electrochemical active surface area and guarantee fast charge transfer,thereby synergistically promoting the catalytic performance of NiFe-LDH/V2CTx/NF in both deionized water electrolyte (261 m V at 100 m A cm-2) and simulated seawater electrolyte (241 mV at 100 mA cm-2).This work can guide the preparation of oxygen evolution catalysts and accelerate the industrialization of seawater electrolysis.

关键词： NiFe-LDH/V 2 CT x /NF catalyst Oxygen evolution reaction Seawater electrolysis Chlorine inhibition