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New technology of ionic liquid-based NH3/CO2 separation from melamine tail gas

Green Chemical engineering 2020年第1期1卷 5-5页

作者： Shaojuan Zeng Haifeng Dong Yinge Bai Xiangping Zhang Suojiang Zhang CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China

Melamine is an important industrial raw material,and widely used in the production of thermal insulation materials,adhesives,fiber materials and so ***,every 1 ton of melamine produced through decomposition and condensation reaction using urea generates about 2.2 tons of tail gas containing about 70%NH_(3)and 29%CO_(2).According to the phase diagram of NH_(3)–CO_(2)-AM(ammonium carbamate),NH_(3)and CO_(2)are easy to react and form AM solid under 63C at ambient pressure,which make it difficult to selective recovery of NH_(3).Water scrubbing is the mostly used technology in industries,but this method demands high energy consumption and discharges a large amount of NH_(3)-containg wastewater,which seriously restricts the sustainable development of industries.

关键词： insulation ambient restrict

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Cover Feature: Hollow Carbon Sphere-Modified Graphitic Carbon Nitride for Efficient Photocatalytic H2Production (Chem. Eur. J. 68/2021)

引用

Chemistry – A European Journal 2021年第68期27卷

作者： Dr. Jinghua Li Dr. Lunqiao Xiong Dr. Bing Luo Prof. Dengwei Jing Dr. Jiamei Cao Prof. Junwang Tang International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China Department of Chemical Engineering University College London London WC1E 7JE UK School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China

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A mixed discontinuous Galerkin method with symmetric stress for Brinkman problem based on the velocity-pseudostress formulation

arXiv

引用

arXiv 2019年

作者： Qian, Yanxia Wu, Shuonan Wang, Fei Wang, Fei School of Mathematics and Statistics Xi'An Jiaotong University Xi'an Shaanxi710049 China School of Mathematical Sciences Peking University Beijing100871 China School of Mathematics and Statistics State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an Shaanxi710049 China

The Brinkman equations can be regarded as a combination of the Stokes and Darcy equations which model transitions between the fast flow in channels (governed by Stokes equations) and the slow flow in porous media (governed by Darcy?fs law). The numerical challenge for this model is the designing of a numerical scheme which is stable for both the Stokes-dominated (high permeability) and the Darcy-dominated (low permeability) equations. In this paper, we solve the Brinkman model in n dimensions (n = 2, 3) by using the mixed discontinuous Galerkin (MDG) method, which meets this challenge. This MDG method is based on the pseudostress-velocity formulation and uses a discontinuous piecewise polynomial pair PSk+1-Pk(k ≥ 0), where the stress field is symmetric. The main unknowns are the pseudostress and the velocity, whereas the pressure is easily recovered through a simple postprocessing. A key step in the analysis is to establish the parameter-robust inf-sup stability through specific parameter-dependent norms at both continuous and discrete levels. Therefore, the stability results presented here are uniform with respect to the permeability. Thanks to the parameter-robust stability analysis, we obtain optimal error estimates for the stress in broken H(div)-norm and velocity in L2-norm. Furthermore, the optimal L2 error estimate for pseudostress is derived under certain conditions. Finally, numerical experiments are provided to support the theoretical results and to show the robustness, accuracy, and flexibility of the MDG method. Copyright © 2019, The Authors. All rights reserved.

关键词： Stability

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Fabrication of highly reliable joint based on Cu/Ni/Sn double-layer powder for high temperature application

Fabrication of highly reliable joint based on Cu/Ni/Sn doubl...

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作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System and Power Electronic Device Packaging Technology Micro-Nano Fabrication Technology Department Institute of Electronic Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China School of Electrical Engineering Electronics and Computer Science University of Liverpool Brownlow Hill LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

A highly reliable three-dimensional network structure joint was fabricated based on Cu/Ni/Sn powder with double-layer coatings and transient liquid phase bonding (TLPB) technology for high temperature application. The Cu/Ni/Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4 intermetallic compounds (IMCs), with a low void ratio, and can be reflowed at low temperatures (6Sn5/ Ni3Sn4 IMCs, and the Cu/Ni/Sn joint had a lower void ratio and a higher shear strength than those of Cu/Sn. The mechanism of the Ni-coating layer inhibiting phase transformation was studied. The high reliable three-dimensional network structure joint based on Cu/Ni/Sn double-layer powder was fabricated for high temperature application. Copyright © International Microelectronics Assembly and Packaging Society

关键词： High temperature applications

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Fabrication of highly reliable jointbased on Cu@Ni@Sn double-layerpowderfor high temperature application

Fabrication of highly reliable jointbased on Cu@Ni@Sn double...

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作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System & Power Electronic Device Packaging Technology Micro-nano fabrication technology department Institute of Electronic Engineering Chinese Academy of Sciences Beijing 100190 China School of Electrical Engineering Electronics andComputer Science University of Liverpool LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

A highly reliable three-dimensional networkstructure jointwas fabricatedbased on Cu@Ni@Sn core-shell powderand transient liquid phase bonding (TLPB) technologyfor high temperature application. Cu@Ni@Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4intermetallics (IMCs), low level of voiding is achieved, they can be reflowed at a low temperatures( © 2019 IMAPS-International Microelectronics and Packaging Society. All rights reserved.

关键词： High temperature applications

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Co2 Capture Performance and Energy Recovery in Pilot-Scale Thermal Electrochemical Co-Drive System

SSRN

引用

SSRN 2019年

作者： Ding, Wancheng Yu, Yunsong Zhang, Zaoxiao Wang, Geoff School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China School of Chemical Engineering The University of Queensland St LuciaQLD4072 Australia

关键词： Greenhouse gases

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Structure engineering of Graphitic Carbon Nitride for Efficient Photocatalytic Water Splitting

Structure Engineering of Graphitic Carbon Nitride for Effici...

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中国化学会第三届中国能源材料化学研讨会

作者：沈少华 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University

Photocatalytic overall water splitting without using sacrificial agents is very appealing for converting solar energy into chemical ***,polymer photocatalysts with tunable molecular structures have emerged as promisin... 详细信息

关键词： Structure engineering of Graphitic Carbon Nitride for Efficient Photocatalytic Water Splitting

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Pore-scale simulation of shale oil flow based on pore network model

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Fuel 2019年 251卷 683-692页

作者： Yongfei Yang Ke Wang Lei Zhang Hai Sun Kai Zhang Jingsheng Ma Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education Qingdao 266580 China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 China Institute of Petroleum Engineering Heriot-Watt University Riccarton Edinburgh UK

The pore-grain characteristics of shale oil reservoir rocks are complex: nano-size pore throats, multi-scale of pore size and topology, and rich in organic matter. Generally, shale oil flow in nanoporous media is significantly affected by microscopic fluid slippage and adsorption on the pore surfaces, which give rise to variable slip length, viscosity ratio of adsorbed phase to bulk phase, and thickness of adsorption layer in organic & inorganic pore throats. In this study, a new pore network model is developed based on a modified shale oil flow equation to consider those combinational effects on shale oil permeability under different organic matter contents, and then is applied to provide an order analysis of those effects on the permeability of a representative shale model. Different flow patterns characterizing fluid-solid interaction are also discussed. Analysis results show that shale oil permeability is strongly influenced by the slip length. The effect of adsorption on permeability is negligible for cases considered. Shale oil flow is mainly controlled by inorganic pores when volumetric TOC is low. The influence of TOC on permeability depends on slippage and adsorption conditions in organic and inorganic matters, referred in this paper to as flow patterns. As the organic matter content increases, the connectivity of organic pores and throats improves, which further affects network permeability.

关键词： Shale oil Pore network model Slippage Adsorption effect Connectivity

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Effect of proppant impingement on flow-induced corrosion of tubular steel super 13Cr via CFD and experiment

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Egyptian Journal of Petroleum 2018年第4期27卷 633-640页

作者： Cheng, J.R. Zhang, N.S. Cao, Y.P. Li, Z. Dou, Y.H. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xianning West Road Xi'an 710049 Shaanxi Province China Department of Petroleum Engineering Xi'an Shiyou University Xi'an 710065 Shaanxi Province China Department of Mechanical Engineering Xi'an Shiyou University Xi'an 710065 Shaanxi Province China

Data from a standard laboratory test including open-circuit potential (OCP) and current density monitoring is used to study the effect of fracturing proppant impingement on corrosion of tubular steel. A solid-liquid flow simulation is performed to obtain some parameters of particle movement and oxygen mass transfer near the metal surface. The results show that the electrochemical reaction includes passivation, activation and repassivation during a particle impact on the metal surface. Once the metal surface is in the activated state, the potential and anode current density is controlled by the oxygen concentration in the boundary layer and repassivation rate of metal surface. The increase of particle impact velocity accelerates the transmission of corrosion reactants and creates deeper impact craters on metal surface, resulting in the increase of current density. Meanwhile, the high speed particle impingement causes some platelets and extruding lips and thus weakens the surface corrosion resistance of stainless steel. © 2017

关键词： flow-induced corrosion Particle impingement Passive films Repassivation Tubular steel

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Stability,acidity and interaction properties of [Bmim][SbF_6] coupled with concentrated sulfuric acid

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Science China Chemistry 2017年第9期60卷 1243-1249页

作者： Honghua Zhang Ruixia Liu Ruirui Zhang Feng Huo Zhiqiang Yang Bin He Suojiang Zhang Yanji Wang School of Chemical Engineering Hebei University of Technology Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of Sciences

Ionic liquid coupled with strong acid systems presents considerable promise in some catalytic fields. In the present work, the multiple complex systems composed by 98 wt% concentrated sulfuric acid and [Bmim][SbF6] were investigated in the terms of stability, acidity and interaction properties. It was found that acidolysis of [Bmim][SbF6] occurred in the 98 wt% concentrated sulfuric acid accompanied by HF releasing and SbF6−degrading to [SbF6−y(HSO4)y]−. The species after acidolysis in the multiple complex systems were checked and confirmed by electrospray ionization mass spectrometry (ESI-MS), Fourier transform infrared spectroscopy (FT-IR),1H NMR and19F NMR. Acidity increased slightly with less than 1 wt% [Bmim][SbF6] addition, while decreased with more proportion, which was determined based on the Hammett acidity functions H0, using13C NMR. The strong hydrogen bond S–O–HF of interaction among the multiple complex systems was confirmed by molecular dynamic simulation. © 2017, Science China Press and Springer-Verlag Berlin Heidelberg.

关键词： Electrodeposition Electrospray ionization Fourier transform infrared spectroscopy Hydrogen bonds Ionic liquids Mass spectrometry Molecular dynamics Sulfuric acid

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