检索结果-内蒙古大学图书馆

Effects of imidazolium-based ionic liquids on the isobaric vapor–liquid equilibria of methanol+dimethyl carbonate azeotropic systems

引用

Chinese Journal of Chemical engineering 2020年第3期28卷 766-776页

作者： Songsong Chen Li Dong Junping Zhang Weiguo Cheng Feng Huo Qian Su Wei Hua Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of Sciences.Beijing 100090China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China SINOPEC Beijing Yanshan CompanyBeijing 102500China Dalian National Laboratory for Clean Energy Dalian 116023China

The separation of methanol(MeOH)and dimethyl carbonate(DMC)is important but difficult due to the formation of an azeotropic *** this work,isobaric vapor–liquid equilibrium(VLE)data for the ternary systems containing different imidazolium–based ionic liquids(ILs),***+DMC+1-butyl-3-methy-limidazolium bis[(trifluoromethyl)sulfonyl]imide([Bmim][Tf2N]),MeOH+DMC+1-ethyl-3-methyl-imidazolium bis[(trifluoromethyl)sulfonyl]imide([Emim][Tf2N]),and MeOH+DMC+1-ethyl-3-methylimidazolium hexafluorophosphate([Emim][PF6])were measured at 101.3 *** mole fraction of IL was varied from0.05 to *** experimental data were correlated with the NRTL and Wilson equations,*** results show that imidazolium-based ILs were beneficial to improve the relative volatility of MeOH to DMC,and[Bmim][Tf2 N]showed a much more excellent performance on the activity coefficient of *** interaction energies of system components were calculated using Gaussian program,and the effects of cation and anion on the separation coefficient of the azeotropic system were discussed.

关键词： Vapor liquid equilibria Ionic liquid Azeotrope Separation Interaction energy

来源：评论

学校读者我要写书评

暂无评论

Improved thermal conductivity of styrene acrylic resin with carbon nanotubes, graphene and boron nitride hybrid fillers

引用

Carbon Resources Conversion 2021年第1期4卷 190-196页

作者： Fuhua Jia Emmanuel Oluwaseyi Fagbohun Qianyu Wang Duoyin Zhu Jianling Zhang Bin Gong Yanbin Cui State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China University of Chinese Academy of Sciences Beijing 100049 China

In the process of printing and copying,the volatilization of toner produces tiny particles and harmful gases that are detrimental to the human ***-temperature printing and copying can reduce harmful gas *** acrylic resin is the main component of toner and the thermal conductivity of toner can be improved by increasing the thermal conductivity of styrene acrylic *** this paper,hexagonal boron nitride(h-BN),carboxyl modified multi-walled carbon nanotubes(MWCNTs-COOH)and graphene hybrid fillers were added into styrene acrylic resin to improve the thermal conductivity of resin composite by forming a connected thermal conductivity network in *** experimental result shows that the thermal conductivity of the h-BN/styrene acrylic resin composite increases with the increase in h-BN filler content(0-20wt%).When 20.0 wt%h-BN is added into styrene acrylic resin,the thermal conductivity is increased by 83.63%.Hybrid fillers(MWCNTs-COOH/graphene and 3.0 wt%h-BN)were added in styrene acrylic resin and the thermal conductivity of the composite is almost the same or higher than that of 20.0 wt%h-BN/styrene acrylic resin *** thermal conductivity of styrene acrylic resin composites improved by 69.57%and 87.14%via adding 1.5wt%CNTs-3 wt%h-BN and 1.0wt%graphene-3 wt%***-COOH or graphene can bridge isolated h-BN aggregates to form a thermally conductive network in styrene acrylic resin,while the addition of graphene improves the thermal conductivity of resin composite higher than that of MWCNTs-COOH.

关键词： Styrene acrylic resin Boron nitride Carbon nanotubes Graphene Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

Coordinated Control of Fine-Particle and Ozone Pollution by the Substantial Reduction of Nitrogen Oxides

引用

engineering 2022年第8期8卷 13-16页

作者： Biwu Chu Yan Ding Xiang Gao Junhua Li Tingyu Zhu Yunbo Yu Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of the Chinese Academy of Sciences Beijing 100049China Chinese Research Academy of Environmental Sciences Beijing 100012China State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control Zhejiang UniversityHangzhou 310027China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

*** In recent years,the air quality in China has improved *** many cities,however,the concentration of fine particulate matter(PM_(2.5))remains higher than the secondary-level national ambient air quality standard(NAAQS level-2,35μg·m^(-3),GB3095-2012[1])and much higher than the first-level NAAQS(15μg·m^(-3),GB3095-2012[1])and the World Health Organization(WHO)air quality guidelines(5μg·m^(-3)).

关键词： Pollution Ozone ambient

来源：评论

学校读者我要写书评

暂无评论

Characteristics of debris flow impact on a double-row slit dam

引用

Journal of Mountain Science 2023年第2期20卷 415-428页

作者： WANG Zhuang LIU Dao-chuan YOU Yong LYU Xiao-bo LIU Jin-feng ZHAO Wan-yu SUN Hao WANG Dong-wei LIU Yang Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu 610041China Sichuan Tongchuan Engineering Technology Development Co. Ltd.Chengdu 610041China State Grid Sichuan Electric Power Transmission&Transformation Construction Co. Ltd.Chengdu 610051China

To accurately predict impact loads can ensure the safe operation of debris flow control *** instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the redistribution of an impact load after structural regulation is *** this study we deduced the theoretical calculation of a debris flow impact on a double-row slit dam,and carried out a verification experiment on the debris flow *** calculation model considers the influence of the debris flow properties,dam arrangement and pile *** results show that the impact force of the debris flow is obviously affected by the bulk *** the bulk density is 21 kg/m^(3),the maximum impact force on the pile dam is 1.15 times that when the bulk density is 15 kg/m^(3),but the time it takes for the debris flow to pass through the dam body is reduced by 60%.The larger the relative pile spacing,the more sufficient the flow space and the lower the maximum impact *** maximum impact force of relative pile spacing of 0.8 is 12%less than that of elative pile spacing of *** horizontal distribution of the impact force in the mud depth range is *** maximum impact force on the centre pier is 1.3 times that of a side pier,and the maximum impact force on the dam body appears at the top of the mud depth *** the vertical distribution of the impact force,the maximum impact force at the highest mud mark is approximately 70%of that of the *** the increase in the relative pile spacing,the longitudinal maximum impact force distribution first decreases and then increases.

关键词： Debris flow force Slit dam Fluctuations Flume model test

来源：评论

学校读者我要写书评

暂无评论

engineering heterogenous catalysts for chemical CO_(2) utilization:Lessons from thermal catalysis and advantages of yolk@shell structured nanoreactors

引用

Journal of Energy Chemistry 2021年第6期30卷 304-324,I0008页

作者： Cameron Alexander Hurd Price Tomas Ramirez Reina Jian Liu DICP-Surrey Joint Centre for Future Materials Department of Chemical and Process EngineeringUniversity of SurreyGuildfordSurrey GU27XHUK State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

The development of catalytic materials for the recycling CO_(2) through a myriad of available processes is an attractive field,especially given the current climate *** there is increasing publication in this field,the reported catalysts rarely deviate from the traditionally supported metal nanoparticle morphology,with the most simplistic method of enhancement being the addition of more metals to an already complex *** catalysts,especially yolk@shell catalysts with hollow voids,offer answers to the most prominent issues faced by this field,coking and sintering,and further potential for more advanced phenomena,for example,the confinement effect,to promote selectivity or offer greater protection against coking and *** work serves to demonstrate the current position of catalyst development in the fields of thermal CO_(2) reforming and hydrogenation,summarizing the most recent work available and most common metals used for these reactions,and how yolk@shell catalysts can offer superior performance and survivability in thermal CO_(2) reforming and hydrogenation to the more traditional ***,this work will briefly demonstrate the bespoke nature and highly variable yolk@shell ***,this review aims to illuminate the spatial confinement effect and how it enhances yolk@shell structured nanoreactors is presented.

关键词： Yolk@shell CO_(2)utilization Reforming Hydrogenation Confinement effect

来源：评论

学校读者我要写书评

暂无评论

Co-Pyrolysis Mechanism of Pp and Pet Under Steam Atmosphere

SSRN

引用

SSRN 2023年

作者： Song, Kuntong Li, Yi Wang, Nan Hou, Wenxia Zhang, Ruiqi Liu, Junhong Zhou, Qing Lu, Xingmei Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Sino Danish College University of Chinese Academy of Sciences Beijing100049 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China Henan Institute of Advanced Technology Zhengzhou University Zhengzhou450001 China

The pyrolysis of polyethylene terephthalate (PET) under steam atmosphere is an effective method for reducing impurities and improving the yield of terephthalic acid (TPA). However, the yield is still low compared to the theoretical maximum. Here, further improvements were achieved through the steam-assisted co-pyrolysis of PET and polypropylene (PP). The results showed that the presence of PP inhibits the excessive cracking of PET and promotes the complete cracking of PP to gaseous products. The optimal reaction temperature was found to be 450 °C, with a maximum yield of TPA of 85.0 wt%, representing an increase compared to the pyrolysis of pure PET. Further, a large amount of olefin monomer was obtained, and the proportion of carbon dioxide in the gaseous products was reduced to 47.7 vol%, which not only improves the efficiency of resource recovery but also reduces carbon emissions. The reaction mechanism of the co-pyrolysis was also explored through analysis of the products in the co-pyrolysis process and by comparing the measured data with theoretical predictions. It was noticed that TPA has a promoting effect on the pyrolysis of PP. This is mainly because TPA is a highly thermally stable Bronsted acid, which can still provide the acidic catalytic site when PP was thermally decomposed during the co-pyrolysis process. Further, a new hydrogen transfer reaction pathway between PP and PET was discovered via isotope tracing experiments, with density functional theory simulations by Material Studio indicating that this pathway occurs between the active hydrogen on the methyl group of PP and the hydrogen on the benzene ring of PET. This study demonstrates that the monomer yield can be improved through the co-pyrolysis of mixed plastics under steam atmosphere, which has important implications for industrial waste plastic recycling applications. © 2023, The Authors. All rights reserved.

关键词： Pyrolysis

来源：评论

学校读者我要写书评

暂无评论

Discrete particle methods for engineering simulation:Reproducing mesoscale structures in multiphase systems

引用

Resources Chemicals and Materials 2022年第1期1卷 69-79页

作者： Ji Xu Peng Zhao Yong Zhang Junwu Wang Wei Ge State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesP.O.Box 353Beijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China

Most natural resources are processed as particle-fluid multiphase systems in chemical,mineral and material indus-tries,therefore,discrete particles methods(DPM)are reasonable choices of simulation method for engineering the relevant processes and ***,direct application of these methods is challenged by the complex multiscale behavior of such systems,which leads to enormous computational cost or otherwise qualitatively inac-curate description of the mesoscale *** coarse-grained DPM based on the energy-minimization multi-scale(EMMS)model,or EMMS-DPM,was proposed to reduce the computational cost by several orders while main-taining an accurate description of the mesoscale structures,which paves the way for its engineering *** empowered by the high-efficiency multi-scale DEM software DEMms and the corresponding customized heterogeneous supercomputing facilities with graphics processing units(GPUs),it may even approach realtime simulation of industrial *** short review will introduce the principle of DPM,in particular,EMMS-DPM,and the recent developments in modeling,numerical implementation and application of large-scale DPM which aims to reach industrial scale on one hand and resolves mesoscale structures critical to reaction-transport coupling on the other *** review finally prospects on the future developments of DPM in this direction.

关键词： Coarse-graining Discrete element method(DEM) EMMS-DPM(EMMS-based discrete particle method) GPU-CPU heterogeneous computing Mesoscale

来源：评论

学校读者我要写书评

暂无评论

Numerical modeling of wet milling process by an improved CFD-DEM-VOF model

MetaResource

引用

MetaResource 2025年第1期2卷 33-55页

作者： Huaqing Ma Changhua Xie Wenrui Wang Lianyong Zhou Zihan Liu Tao Song Guobin Zou Jiawei Yang Zongqing Zhou Kaiwei Chu Yongzhi Zhao School of Qilu Transportation Shandong UniversityJinan 250061China Zhejiang Huayou Cobalt Co. LtdJiaxing 314500China Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Intelligent Optimized Manufacturing in Mining&Metallurgy Process Beijing 100160China

Wet ball mill that has been extensively used to comminute the raw materials in various industries possesses the advantages of large production capacity,high grinding efficiency,low investment and so *** mill is a typical gas-liquid-solid three-phase system,and the interaction between these three phases is quite complex,resulting in the difficulty to simulate the wet milling *** a consequence,a numerical model by coupling computational fluid dynamics(CFD),discrete element method(DEM)and volume of fluid(VOF)is developed to accurately simulate the wet milling process.A novel scheme is also devised and incorporated into CFD-DEM-VOF model to treat the interphase coupling when the particles and CFD cells have the comparable size that will be encountered in simulating the wet milling *** accuracy of the established CFD-DEM-VOF coupling model is then validated by several test cases,including the single particle sedimentation in air-liquid domain,water entry of particle assembly and three-phase flows in a lab-scale wet mill and an industrial-scale wet ***,the effects of CFD cell size(2.5,5 and 10 mm)and mill rotation speed(10,30 and 50 r/min)on the prediction accuracy are also explored by the test case of lab-scale *** results indicate that using the quite coarse CFD cells can deteriorate the simulation accuracy,and increasing the mill rotation speed will enhance this ***,adopting the very fine CFD cells(e.g.,2.5 mm in this work)in our model is not necessary in terms of the accuracy in simulating the particle behaviors,and the reliable prediction of particle behaviors can still be obtained while using the relatively large CFD cells(e.g.,5 mm in this paper).

关键词： multi-phase flow gas-liquid-solid coupling wet milling process CFD-DEM-VOF comparable particle CFD cell sizes

来源：评论

学校读者我要写书评

暂无评论

Structural Design and Performance Study of a Biobased UV/Moisture Dual-Curing Coating for UV Inadequate Curing Conditions

SSRN

引用

SSRN 2024年

作者： Ding, Ao Zhang, Pengfei Zhou, Bing Liu, Guang Xu, Pingfan Luo, Yaofa Zhuang, Yihua Zhang, Peikun Chen, Aizheng Liu, Yuan Luo, Zhongzhen School of Advanced Manufacturing Fuzhou University Jinjiang362200 China Institute of Biomaterials and Tissue Engineering Fujian Provincial Key Laboratory of Biochemical Technology Huaqiao University Xiamen361021 China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu610065 China Joint Laboratory on Advanced Materials Technologies College of Materials Science and Engineering Fuzhou University Fuzhou350108 China

As a new type of coating in recent years, UV curable coating has been widely used because of its environment friendliness, high curing efficiency and optimized energy consumption. However, UV curing technology also has some problems such as colored coating and shadow parts are difficult to cure, the establishment of UV/ moisture curing system can effectively solve these problems. In addition, the selection of raw materials in coating preparation is also gradually inclined to choose environmentally friendly bio-based materials. In this context, a UV/moisture bi-curable polyurethane prepolymer was synthesized from castor oil (CO), polytetramethylene ether glycol (PTMEG), isophorone diisocyanate (IPDI), hydroxyethyl methacrylate (HEMA) and tetrahydrofuran acrylate (THFA). The prepared prepolymer can be cured quickly after the addition of photoinitiator and monomer. The volume shrinkage of the cured coating is 3.05 vol% and the gel content is 92.73 wt%. The coating has excellent heat resistance and mechanical strength, and the tensile strength can reach 8.4MPa. The water contact Angle of the coating can reach 91°, which has good anti-fouling performance. Compared with traditional photocurable coatings, the coatings show excellent comprehensive properties and have wider application prospects. © 2024, The Authors. All rights reserved.

关键词： Heat resistance

来源：评论

学校读者我要写书评

暂无评论

Temperature field simulation of polyolefin-absorber mixture by FDTD-FDM model during microwave heating

引用

Chinese Journal of Chemical engineering 2020年第11期28卷 2900-2917页

作者： Xiaodong Jing Hao Wen Zhihong Xu State Key Laboratory of Multiphase Complex Systems Beijing Engineering Research Centre of Process Pollution ControlInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

This work has performed a numerical simulation of the temperature field during microwave heating of polyolefin-absorber mixture by means of a combined electric and thermal model.A finite difference time domain was used to model the electric field distribution within the cavity,while the finite difference method was used to calculate the temperature field distribution in different *** study has focused only on the process from room temperature to 500 K for reducing heating time and energy *** temperature range is a process with high energy consumption,difficult to control and great influence on the follow-up *** dependence of dielectric properties and thermal properties of heated materials are fully considered and simulated through an iterative *** simulation results show that input power,the size and location of the heated materials,the position of the waveguide,and the kinds of microwave absorbers are important factors affecting the heating *** a result,the uniform temperature distribution(the temperature difference Tdb10 K)can be achieved by choosing the appropriate input power(500–2000 W),the appropriate proportion of microwave absorber(the volume ratio of Si C to HDPE is 30:70),and combining with the moving and rotating of the heated *** uniform temperature field obtained without mechanical stirring is very important for reducing energy consumption and subsequent reactions.

关键词： Microwave heating Temperature field Finite difference time domain Finite difference method

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：