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Efficient, continuous oxidation of durene to pyromellitic dianhydride mediated by a V-Ti-P ternary catalyst: The remarkable doping effect

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Chinese Journal of Chemical Engineering 2023年第3期55卷 156-164页

作者： Da Ke Minjia Wang Jiancheng Ruan xinzhi chen Shaodong Zhou College of Chemical and Biological Engineering Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyZhejiang UniversityHangzhou 310027China Institute of Zhejiang University±Quzhou Quzhou 324000China

Continuous preparation of pyromellitic dianhydride(PMDA) from durene has been studied using a fixedbed reactor. The reaction was performed using a phosphorus-vanadium-titanium ternary catalyst.Relatively high selectivity and yield of PMDA was obtained. The in-situ characterization was combined with theoretical calculation to reveal the reaction mechanisms, and the remarkable doping effect was discussed.

关键词： Continuous oxidation Anhydride CAH activation V-Ti-P ternary catalyst

Nanoparticles for the treatment of spinal cord injury

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Neural Regeneration Research 2025年第6期 1665-1680页

作者： Qiwei Yang Di Lu Jiuping Wu Fuming Liang Huayi Wang Junjie Yang Ganggang Zhang chen Wang Yanlian Yang Ling Zhu xinzhi Sun Department of Orthopedic Surgery The First Affiliated Hospital of Zhengzhou University CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology University of Chinese Academy of Sciences Department of Neurosurgery The First Affiliated Hospital of Chongqing Medical University

Spinal cord injuries lead to significant loss of motor, sensory, and autonomic functions, presenting major challenges in neural regeneration. Achieving effective therapeutic concentrations at injury sites has been a slow process, partly due to the difficulty of delivering drugs effectively. Nanoparticles, with their targeted delivery capabilities, biocompatibility, and enhanced bioavailability over conventional drugs, are garnering attention for spinal cord injury treatment. This review explores the current mechanisms and shortcomings of existing treatments, highlighting the benefits and progress of nanoparticle-based approaches. We detail nanoparticle delivery methods for spinal cord injury, including local and intravenous injections, oral delivery, and biomaterial-assisted implantation, alongside strategies such as drug loading and surface modification. The discussion extends to how nanoparticles aid in reducing oxidative stress, dampening inflammation, fostering neural regeneration, and promoting angiogenesis. We summarize the use of various types of nanoparticles for treating spinal cord injuries, including metallic, polymeric, protein-based, inorganic non-metallic, and lipid nanoparticles. We also discuss the challenges faced, such as biosafety, effectiveness in humans, precise dosage control, standardization of production and characterization, immune responses, and targeted delivery in vivo. Additionally, we explore future directions, such as improving biosafety, standardizing manufacturing and characterization processes, and advancing human trials. Nanoparticles have shown considerable progress in targeted delivery and enhancing treatment efficacy for spinal cord injuries, presenting significant potential for clinical use and drug development.

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Influence of dispersants on coal-water slurry prepared from the solid residue of plasma pyrolysis of coal

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Chinese Journal of Chemical Engineering 2020年第2期28卷 566-570页

作者： Chao Qian Liang Zhao Xin Ge xinzhi chen School of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027China School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China

This work presents the influence of dispersants on coal-water slurry(CWS),which was prepared from the solid residue of plasma pyrolysis of coal.The effects of dispersant type,solid concentration,dispersant content,and temperature on the rheological properties of CWS are examined.A suitable empirical model regarding the relation between viscosity and temperature is proposed.Through the sedimentation experiment of CWS,dispersants are found to significantly promote the stability of CWS.

关键词： Plasma pyrolysis of coal Solid residue Dispersants CWS Rheology

Aminolysis of ethyl acetate in continuous flow and its reaction kinetics

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Chinese Journal of Chemical Engineering 2019年第12期27卷 2948-2952页

作者： Tao Shen Bo Ouyang Chao Qian xinzhi chen Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Garden Biochemical High-Tech Co. LTDDongyan 322121China Research Institute of Zhejiang University-Quzhou Quzhou 324000China

The aminolysis of ethyl acetate was promoted significantly via continuous reaction in a tubular reactor.Npropylacetamide was thus synthesized without presence of solvent and catalyst.The optimum conditions were obtained as follows:the reaction temperature is 218℃,the reaction pressure is 3.5 MPa,the molar ratio(ethyl acetate:N-propylamine)is 1:1,and the residence time is 350 min.Accordingly,the conversion of ethyl acetate is up to94.8%.Furthermore,the kinetics of the rapid reaction stage(when the conversion of ethyl acetate is 20%-80%)can be expressed as Ink=-4629.441/T+2.1366,and the apparent activation energy is Ea=38489 J·mol-1.

关键词： Tubular reactor Reaction kinetics Ethyl acetate Aminolysis

干密度和初始含水率对珊瑚砂持水性的影响研究

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岩石力学与工程学报 2024年第S1期43卷 3568-3577页

作者：吴昊沈建华雷学文陈翔丁浩桢王新志中国科学院武汉岩土力学研究所湖北武汉430071 武汉科技大学城市建设学院湖北武汉430081 同济大学土木工程学院上海200092

为研究干密度和初始含水率对珊瑚砂持水性的影响,开展压力板脱湿试验对不同干密度和初始含水率试样的土-水特征曲线进行测试分析,并通过核磁共振技术获取试样在不同吸力下的孔隙水分布特征。试验结果表明:珊瑚砂的进气值随干密度的增大... 详细信息

为研究干密度和初始含水率对珊瑚砂持水性的影响,开展压力板脱湿试验对不同干密度和初始含水率试样的土-水特征曲线进行测试分析,并通过核磁共振技术获取试样在不同吸力下的孔隙水分布特征。试验结果表明:珊瑚砂的进气值随干密度的增大而增大,随初始含水率的升高而减小;残余含水率随干密度和初始含水率的增大而增大,总体来说,干密度大、初始含水率高的试样持水性更好;F-X模型对不同条件下珊瑚砂试样的土-水特征曲线具有较好适用性;干密度和初始含水率对压实珊瑚砂试样的孔隙大小分布和持水性具有重要影响,但随基质吸力增大,两者对珊瑚砂持水性的影响在逐渐减弱;在不同吸力阶段内,干密度和初始含水率对珊瑚砂持水性的影响规律存在差异,在0~10 kPa下,初始含水率作为主要影响因素,10~70 kPa下,干密度的影响更大,在70~300 kPa下,两者均不对珊瑚砂的持水性产生主要影响;珊瑚砂孔隙连通性差,致使大孔隙在高吸力下仍可储存水分,这在一定程度上增强了珊瑚砂的持水性。

关键词：土力学珊瑚砂持水特性核磁共振孔隙水分布

A safe and efficient process for the preparation of difluoromethane in continuous flow

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1860-1865页

作者： Tao Shen Xin Ge Hengjun Zhao Zhixiong Xu Shaofeng Tong Shaodong Zhou Chao Qian xinzhi chen College of Chemical and Biological Engineering Zhejiang UniversityZhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyHangzhou 310027China School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China Jiangsu Sanmei Chemical Co. Ltd.Nantong 226461China

Difluoromethane is typically produced vialiquid-phase fluorination as performed in a batch reactor.However,this process suffers from some problems,e.g.,severe corrosion of the reactor,high safety risk,and the regeneration of the catalyst.In this paper,a flow process as performed in the tubular reactor was designed.The optimum conditions for continuous synthesis of difluoromethane were obtained as follows:the reaction temperature was 100℃,the molar ratio of dichloromethane to hydrogen fluoride was 1.6:1 and the reaction time was 300 s.The operation of the cyclic process was stable for 24 h with the conversion per pass of hydrogen fluoride up to 16.2%.The unreacted raw materials were easily reused.The deactivation of the common catalyst,antimony pentachloride,was investigated by catalyst concentration curve and XPS analysis.The approach proposed in this work is proven to be safe,efficient and low amount of catalyst.

关键词： Tubular reactor Continuous synthesis Difluoromethane Catalyst

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利用SG平滑滤波优化GNSS-R潮位反演

南京信息工程大学学报 2024年第2期16卷 270-278页

作者：孙波王新志陈发源朱廷轩黄鑫南京信息工程大学遥感与测绘工程学院南京210044

利用全球导航卫星系统反射(GNSS-R)信号进行潮位反演时,需要对多路径频率进行估计.常规反演方法仅对主频率估计,因此存在数据利用率低、反演结果时间分辨率不足的问题.为解决该问题,本文利用Savitzky-Golay(SG)平滑滤波优化GNSS-R潮位反... 详细信息

利用全球导航卫星系统反射(GNSS-R)信号进行潮位反演时,需要对多路径频率进行估计.常规反演方法仅对主频率估计,因此存在数据利用率低、反演结果时间分辨率不足的问题.为解决该问题,本文利用Savitzky-Golay(SG)平滑滤波优化GNSS-R潮位反演.首先,利用Lomb-Scargle周期图(LSP)法提取信号功率的前4个频率f_(1)~f_(4),并反演它们对应的潮位值;然后,利用SG平滑滤波方法提取最佳反演结果;最后,以法国BRST站和MAYG站30 d的数据验证算法的有效性.通过与LSP法和窗口LSP(WINLSP)法进行对比,结果表明:相比LSP法,滤波后BRST站和MAYG站的日均反演值数量分别提升34.3%和19.6%,反演值的最大时间间隔分别减少43.2%和29.4%,RMSE值变化不大;相比WINLSP法,滤波后BRST站和MAYG站的日均反演值数量分别提升24.2%和45.9%,反演值最大时间间隔分别减少25.4%和28.6%,RMSE值均减少了7 cm.总体而言,该方法能够在保证精度的前提下提高反演结果的数量,同时提高了数据的利用率和潮位反演的时间分辨率.

关键词：全球导航卫星系统反射测量平滑滤波多频率潮位

Carbohydrate-Derived Organocatalysts for the Reduction of Imines with Trichlorosilane

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Journal of Materials Science and Chemical Engineering 2015年第6期3卷 48-53页

作者： Xin Ge Chao Qian xinzhi chen School of Chemical and Material Engineering Jiangnan University Wuxi China Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou China

The backbone of D-glucosamine hydrochloride was fine-tuned and modified by protecting the hydroxyl groups. In order to reduce imines with trichlorosilane, the carbohydrate-derived organocatalysts were prepared and screened. Methyl-4,6-O-benzylidene-2-amino-2-deoxy-α-D-glucopyr anoside was found as the best catalyst. The reduction was proceeded under CHCl3 as solvent at 40?C, affording 68% - 94% yield.

关键词： Carbohydrate Organocatalyst Reduction Imine

铜锌锡硫基薄膜太阳能电池中锌基缓冲层的研究进展

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江苏科技大学学报（自然科学版） 2024年第2期38卷 23-30页

作者：张琳袁妍妍吴昕智陈阳王近江苏科技大学材料科学与工程学院镇江212100

由多层结构组成的薄膜太阳能电池具有低成本、易生产、稳定性高等优点,解决了晶体太阳能电池原料要求高以及制备工艺复杂等缺点,其中的缓冲层材料作为薄膜太阳能电池中的重要组成部分一直是研究重点.近年来,无毒、环保且能获得较高光电... 详细信息

由多层结构组成的薄膜太阳能电池具有低成本、易生产、稳定性高等优点,解决了晶体太阳能电池原料要求高以及制备工艺复杂等缺点,其中的缓冲层材料作为薄膜太阳能电池中的重要组成部分一直是研究重点.近年来,无毒、环保且能获得较高光电效率的缓冲层材料引起学者的广泛研究.文中以铜锌锡硫基太阳能电池为例,综述了有关硫化锌(ZnS)、氧化锌(ZnO)、氧硫化锌(Zn(O,S))、氧化锌锡(ZTO)和氧化锌镁(ZMO)缓冲层材料在薄膜太阳能电池中的应用.详细阐述了5种缓冲层材料的制备方法、性能变化、应用前景以及对太阳能电池转换效率的影响,以期为未来制备高效环保薄膜太阳能电池提供有效参考.

关键词：薄膜太阳能电池锌基缓冲层转换效率能带匹配