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Improved film evaporator for mechanistic understanding of microwave-induced separation process

Frontiers of Chemical Science and Engineering 2019年第4期13卷 759-771页

作者： Xin Gao Dandan Shu xingang li Hong li School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China School of Chemical Engineering and Analytical Science The University of ManchesterManchesterM139PLUK

Microwave-induced film evaporation separation process has been reported recently to separate the polar/nonpolar ***,the efficiency of the separation is still too low for practical applications,which requires further enhancement via different strategies such as optimization design of evaporator *** addition the depth understanding of the separation mechanisms is great importance for better utilization of the microwaveinduced separation *** carry out these investigations,a novel microwave-induced falling film evaporation instrument was developed in this *** improvement of the enhancement effect of microwave-induced separation was observed based on the improved film *** systematic experiments on microwave-induced separation with different binary azeotropic mixtures(ethanol-ethyl acetate system and dimethyl carbonate(DMC)-H20 system)were conducted based on the new *** the ethanol-ethyl acetate system,microwave irradiation shifted the direction of evaporation separation at higher ethanol content in the starting liquid ***,for DMC-H20 system microwaveinduced separation process broke through the limitations of the traditional distillation *** results clearly demonstrated the microwave-induced evaporation separation process could be commendably applied to the separation of binary azeotrope with different dielectric *** of operating parameters are also investigated to trigger further mechanism understanding on the microwave-induced separation process.

关键词： process intensification microwave falling film evaporation separation azeotrope

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Research progress of defect-engineered UiO-66(Zr)MOFs for photocatalytic hydrogen production

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Frontiers in Energy 2021年第3期15卷 656-666页

作者： Yating WANG Chaosheng PENG Tao JIANG xingang li School of Chemical Engineering and Material Science Tianjin University of Science and TechnologyTianjin 300457China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

In recent years,defect-engineered Zr-based UiO-66 metal-organic frameworks(UiO-66(Zr)metalorganic frameworks(MOFs))have shown huge advantages in catalytic,functional materials,adsorption,and other fields due to their large surface areas,well-ordered porous structures,and flexible *** is extremely challenging to introduce defect sites in the synthesis of MOFs to regulate the physicochemical properties of materials such as(energy band structure,pore structure,etc.)to obtain an excellent *** paper reviews the recent research results of synthesis methods,characterization technologies,and application fields of defect-engineered UiO-66(Zr)MOFs materials in order to provide new insights to synthesize high-performance UiO-66(Zr)MOFs materials and promote the development of UiO-66(Zr)in various fields.

关键词： defect engineering metal-organic frameworks UiO-66 photocatalysis

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A generalized CFD model for evaluating catalytic separation process in structured porous materials

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Chinese Journal of Chemical Engineering 2022年第11期51卷 168-177页

作者： Anshi Hong Zisheng Zhang xingang li Xin Gao School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China Department of Chemical and Biological Engineering University of OttawaOttawa K1N 6N5Canada

A hybrid multiphase model is developed to simulate the simultaneous momentum, heat and mass transfer and heterogeneous catalyzed reaction in structured catalytic porous materials. The approach relies on the combination of the volume of fluid(VOF) and Eulerian–Eulerian models, and several plug-in field functions. The VOF method is used to capture the gas–liquid interface motion, and the Eulerian–Eulerian framework solves the temperature and chemical species concentration equations for each *** self-defined field functions utilize a single-domain approach to overcome convergence difficulty when applying the hybrid multiphase for a multi-domain problem. The method is then applied to investigate selective removal of specific species in multicomponent reactive evaporation process. The results show that the coupling of catalytic reaction and interface species mass transfer at the phase interface is conditional, and the coupling of catalytic reaction and momentum transfer across fluid–porous interface significantly affects the conversion rate of reactants. Based on the numerical results, a strategy is proposed for matching solid catalyst with operating condition in catalytic distillation application.

关键词： CFD(computational fluid dynamics) Hybrid multiphase model SiC foam Mass transfer Catalytic distillation

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Process intensification in vapor–liquid mass transfer: The state-of-the-art

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1236-1246页

作者： Hong li Chuanhui Wu Zhiqiang Hao xingang li Xin Gao School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin University

The concept of process intensification(PI) has absorbed diverse definitions and stays true to the mission—'do more with less', which is an approach purposed by chemical engineers to solve the global energy & environment problems. To date, the focus of PI has been on processes mainly involving vapor/liquid systems. Based on the fundamental principles of vapor–liquid mass transfer process like distillation and absorption, there are three strategies to intensify interphase mass transfer: enhancing the overall driving force, improving the mass transfer coefficient and enlarging the vapor–liquid interfacial area. More specifically, this article herein provides an overview of various technologies to strengthen the vapor–liquid mass transfer, including application of external fields, addition of third substances, micro-chemical technology and usage of solid foam, with the objective to contribute to the future developments and potential applications of PI in scientific research and industrial sectors.

关键词： Mass transfer Transport process Two-phase flow Process intensification Microwave field Foam

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不确定性下的低轨卫星激光星间链路误差模型修正方法

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空间控制技术与应用 2024年第2期50卷 47-58页

作者：武倩怡张尧毛岸远唐书雅李新刚北京理工大学北京100081 中国空间技术研究院通信与导航卫星总体部北京100094

在工程应用中,激光链路构建过程不可避免地会受到各种不确定性的影响,导致激光建链在扫描过程中对指向区域估计不准,降低星间激光建链的准确性.因此,应多方面考虑不确定因素来修正低轨激光星间链路的动力学指向误差模型,为后期的扫描捕... 详细信息

在工程应用中,激光链路构建过程不可避免地会受到各种不确定性的影响,导致激光建链在扫描过程中对指向区域估计不准,降低星间激光建链的准确性.因此,应多方面考虑不确定因素来修正低轨激光星间链路的动力学指向误差模型,为后期的扫描捕获提供基础.提出一种考虑不确定性因素的低轨卫星激光星间链路动力学指向误差模型修正方法,激光星间链路系统以及不确定参数进行描述,建立系统动力学模型;对不确定参数进行了灵敏度分析,并基于灵敏度指标,使用Kriging方法建立了原有系统动力学的代理模型,并验证模型预测精度;确定不确定性量化指标,使用贝叶斯随机模型修正技术对系统动力学模型不确定参数进行修正;通过数值仿真验证了不确定性下的星间链路指向误差动力学模型修正方法的有效性和可行性.

关键词：模型修正星间激光建链灵敏度分析代理模型

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程序性死亡受体1抑制剂致免疫相关性心肌炎的临床特征分析

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临床药物治疗杂志 2024年第7期22卷 64-68页

作者：廖音程晟李新刚首都医科大学附属北京友谊医院药剂科北京100050

目的探讨PD-1抑制剂致免疫相关性心肌炎的临床特征及药学监护策略。方法回顾性分析2020—2023年首都医科大学附属北京友谊医院收治的PD-1抑制剂致免疫相关性心肌炎病例的诊疗过程,分析患者的临床特征、治疗及转归情况。结果共纳入5例患... 详细信息

目的探讨PD-1抑制剂致免疫相关性心肌炎的临床特征及药学监护策略。方法回顾性分析2020—2023年首都医科大学附属北京友谊医院收治的PD-1抑制剂致免疫相关性心肌炎病例的诊疗过程,分析患者的临床特征、治疗及转归情况。结果共纳入5例患者,其中使用替雷利珠单抗2例、信迪利单抗1例、卡瑞利珠单抗1例、特瑞普利单抗1例。从首次使用PD-1抑制剂治疗至确诊为免疫相关性心肌炎时间为(36.80±12.74)d。5例患者心肌酶谱均明显升高,均给予糖皮质激素治疗。治疗后,1例患者症状完全好转,4例死亡。结论免疫相关性心肌炎是PD-1抑制剂的罕见严重不良反应,死亡率高,医师和药师须加强监护以尽早发现并干预,糖皮质激素治疗应给予合适剂量、疗程及患者教育,以增加患者的用药安全。

关键词：程序性死亡受体1抑制剂免疫检查点抑制剂免疫相关性心肌炎药学监护

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Bus evacuation during no-notice disasters in downtown areas: A case study of the Zhongguancun area, Beijing

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Journal of Safety Science and Resilience 2022年第3期3卷 235-242页

作者： xingang li Xiaodan Cui Rui Jiang Bin Jia Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport Beijing Jiaotong UniversityBeijing 100044China

This paper focuses on the bus evacuation problem with pedestrians’short-distance walking ability between bus stations during no-notice disasters in downtown areas.A mixed-integer linear programming model is proposed to solve this *** objective function is to minimize the evacuation time and number of *** model obtains the flow of evacuees and buses on each arc to the route of buses in the process of ***,a real-time bus evacuation demand estimation method is proposed based on smart card ***,the example of Zhongguancun area in Beijing is used to verify the practicality and validity of the *** results show that pedestrian short-distance walking can effectively reduce casualties and improve the utilization rate of buses.

关键词： No-notice disaster Bus evacuation Short-distance walking Mixed integer linear programming

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泡沫镍负载CeO_(2)改性CuO催化剂的碳烟燃烧性能研究

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化工学报 2024年第1期75卷 312-321页

作者：张家琳徐大为高越李新刚天津大学化工学院天津市应用催化科学与工程重点实验室天津化学化工协同创新中心化学工程联合国家重点实验室天津300354

通过在泡沫镍基底上预沉积CeO_(2)晶核,采用水热法成功合成出泡沫镍负载CeO_(2)改性CuO催化剂(xCeO_(2)-CuO/NF),同未加入CeO_(2)的催化剂(CuO/NF)相比,其碳烟氧化活性显著提高。随着催化剂中CeO_(2)含量的增加,Ce/Cu质量比不断增大直... 详细信息

通过在泡沫镍基底上预沉积CeO_(2)晶核,采用水热法成功合成出泡沫镍负载CeO_(2)改性CuO催化剂(xCeO_(2)-CuO/NF),同未加入CeO_(2)的催化剂(CuO/NF)相比,其碳烟氧化活性显著提高。随着催化剂中CeO_(2)含量的增加,Ce/Cu质量比不断增大直至趋于平稳,催化剂的催化活性随之提高直至基本不变。其中,6.5CeO_(2)-CuO/NF的催化活性最好,T_(50)(383℃)最低,比CuO/NF催化剂低32℃。研究结果表明,预沉积CeO_(2)晶核一方面可促进CuO微纳结构的生长,提高碳烟颗粒与催化剂活性位点的接触效率;另一方面,xCeO_(2)-CuO/NF中形成的Cu_(x)Ce_(1-x)O固溶体增强了铜铈之间的相互作用,通过Ce^(3+)/Ce^(4+)和Cu^(2+)/Cu^(+)之间氧化还原耦合循环促使活性氧物种的生成,并提升了其本征活性,从而极大地提高了其催化碳烟氧化的能力。

关键词：催化剂固溶体纳米结构多相反应活性氧物种

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Molecular interaction mechanism in the separation of a binary azeotropic system by extractive distillation with ionic liquid

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Green Energy & Environment 2021年第3期6卷 329-338页

作者： Hong li Guanlun Sun Dongyang li li Xi Peng Zhou xingang li Ji Zhang Xin Gao School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin300072China Department of Chemical Engineering McMaster UniversityHamiltonOntarioL8S 4L7Canada

Ionic liquids(ILs)have shown excellent performance in the separation of binary azeotropes through extractive distillation[1].But the role of the ionic liquid in azeotropic system is not well *** this paper,COSMO-RS model was applied to screen an appropriate IL to separate the binary azeotrope of ethyl acetate(EA)and ethanol and 1-octyl-3-methylimidazolium tetrafluoroborate([OMIM][BF4])was *** Quantum Mechanics(QM)calculations and molecular dynamics(MD)simulation are performed to study the interactions between the solvent molecules and[OMIM][BF4],in order to investigate the separation mechanism at the molecular *** nature of the interactions is studied through the reduced density gradient(RDG)function and quantum theory of Atom in Molecule(QTAIM).Hydrogen bonds and van der Waals interactions are the key interactions in the *** results of MD simulations indicate that the introduction of ILs has a prominent effect on the interaction between the solvent molecules,especially on reducing the number of hydrogen bonds among the solvent *** radial distribution function(RDF)reveals that the interaction between the cation and solvent molecules will increase while the concentration of ILs *** paper provides important information for understanding the role of ILs in the separation of the azeotropic system,which is valuable to the development of new entrainers.

关键词： Ionic liquids Azeotrope Density functional theory Separation Extractive distillation

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2D-Cell Experiment on Methyl Tert-Butyl Ether Transport in Saturated Zone of Groundwater

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Chinese Geographical Science 2007年第3期17卷 275-279页

作者： li Hong li xingang Gao Chuanbo Huang Guoqiang Jiang Bin School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China National Engineering Research Center for Distillation Technology Tianjin UniversityTianjin300072China

As an additive of gasoline,methyl ten-butyl ether(MTBE)has a higher solubility in water,which is about 20 times as high as that of *** characteristic results in MTBE dissolving out of the gasoline into the soil and *** to relative unique physicochemical behavior of MTBE it would be an ideal candidate for use in environmental forensic *** order to study the transport and distribution of MTBE in saturated zone of ground water,a two-dimensional experimental cell was setup to simulate the real environment of the groundwater *** effects of soil and groundwater flow velocity on the MTBE transport were *** results show that the mobile distance of MTBE in vertical direction was smaller than that in horizontal direction paralleling with the groundwater *** the main dynamics of groundwater flow direction was convection and dispersion,the movement of MTBE is also diffusion in the vertical *** addition,the transport of MTBE was more quick in high permeability porous media,and the increase of groundwater flow velocity can accelerate the MTBE plume development,but the irregularity and randomness of the plume are enhanced *** research results can give some helps for the investigation of MTBE movement in the groundwater,also can make some references for other petroleum contamination behavior.

关键词： Methyl Tert-Butyl Ether pollutant transport groundwater 2D-sandbox

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