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2012 AIChE Spring Meeting and 8th Global Congress on process Safety, 12AIChE

作者： Li, Xinrui Koseki, Hiroshi Mannan, M. Sam Mary Kay O'Connor Process Safety Center Artie McFerrin Department of Chemical Engineering Texas A and M University College Station TX 77843-3122 United States National Research Institute of Fire and Disaster Japan 4-35-3 Jindaiji-higashi-machi Chofu Tokyo 182-8508 Japan

ISBN: (纸本)9780816910717

In this study, the reactivity of tert-butyl ethyl ether (ETBE) is scanned at elevated temperature by a heat flux calorimeter C80. It was found that ETBE is unstable at the range of 60-80 °C, and a further significant runaway reaction occurs at above 150 °C. The initial reaction was examined at 65 °C by a thermal activity monitor (TAM), showing the more the volume concentration of oxygen, the more the heat of reaction. This implies that oxidation is responsible for the heat release at this temperature range. Furthermore, the thermal behavior of ETBE is studied by an Automatic Pressure Tracking Calorimeter (APTAC) under different oxygen environments. The effect of the amount of oxygen on the degree of oxidation was discussed. And the pressure rise at different temperature range was observed, in order to clarify the mechanism on how the initial reaction of ETBE can transit to the further significant consequence of a runaway occurrence.

关键词： Oxidation

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Packing Characterization: Mass Transfer Properties

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Energy Procedia 2012年 23卷 23-32页

作者： Chao Wang Micah Perry Gary T. Rochelle A. Frank Seibert Department of Chemical Engineering University of Texas at Austin 1University Station C0400 Austin TX 78712 USA Process Science and Technology Center Pickle Research Center 10100 Burnet Road Austin TX 78758 USA

Packing is widely used in post-combustion CO2 capture. This paper is focused on the measurement of three fundamental packing characteristics: effective gas-liquid contact area (ae), gas phase and liquid phase film mass transfer coefficient (kG) and (kL). Results show that contact area initially increases with liquid flow rate before it asymptotes to a value nearly equivalent to the nominal surface area. Initial attempts at constructing new mechanistic models have shown that existing kG and kL models can be improved. Both gas and liquid phase film mass transfer coefficients can be described as a power function of superficial gas or liquid velocity.

关键词： Post-combustion capture structured packing random packing packing effective area gas phase film mass transfer coefficient liquid phase film mass transfer coefficient

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Carbon nanocapsules as an effective sensing platform for fluorescence-enhanced nucleic acid detection

Carbon nanocapsules as an effective sensing platform for flu...

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作者： Chang, Guohui Hu, Jianming Lu, Wenbo Qin, Xiaoyun Asiri, Abdullah M. Al-Youbi, Abdulrahman O. Sun, Xuping Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province School of Chemistry and Chemical Industry China West Normal University Nanchong 637002 Sichuan China Optical Engineering Key Laboratory of Chongqing College of Physics and Electronic Engineering Chongqing Normal University Chongqing 400047 China Chemistry Department Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Center of Excellence for Advanced Materials Research King Abdulaziz University Jeddah 21589 Saudi Arabia

In this communication, we demonstrate the proof of concept that carbon nanocapsules (CNCs) can be used as an effective fluorescent sensing platform for nucleic acid detection with selectivity down to single-base mismatch. The detection is accomplished by two steps: (1) CNC adsorbs and quenches the fluorescence of the dye-labeled single-stranded DNA (ssDNA) probe;(2) in the presence of the target, a hybridization event occurs, which produces a double-stranded DNA (dsDNA) that detaches from the CNC surface, leading to recovery of the dye fluorescence. Copyright © 2012 American Scientific Publishers. All rights reserved.

关键词： Fluorescence

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The WebLabs of the University of Cambridge: A study of securing remote instrumentation

The WebLabs of the University of Cambridge: A study of secur...

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2012 9th International Conference on Remote engineering and Virtual Instrumentation, REV 2012

作者： Richter, Th. Watson, R. Kassavetis, S. Kraft, M. Grube, P. Boehringer, D. De Vries, P. Hatzikraniotis, E. Logothetidis, S. Computing Center University of Stuttgart Germany University of Cambridge Department of Chemical Engineering and Biotechnology Computational Modeling Group United Kingdom University of Edinburgh Department of Chemical Engineering United Kingdom Delft University of Technology Section System Engineering Faculty of Technology Policy and Management NL-2600GA Delft Netherlands Aristotle University of Thessaloniki Lab. for Thin Films Nanosystems and Nanometrology Physics Department Thessaloniki GR-54 124 Greece Aristotle University of Thessaloniki Physics Department Faculty of Sciences Building Thessaloniki GR-54 124 Greece Computing Center University of Stuttgart New Media in Education and Research Germany University of Edinburgh Institute for Materials and Processes Department of Engineering Edinburgh EH8 9NX United Kingdom

ISBN: (纸本)9781467325424

Safe deployment of web interfaces for remote instrumentation requires that the laboratory system be protected from harmful manipulation by end users or attacks from malicious software over the internet. Industrial control systems, although highly relevant to contemporary engineering education and an essential component of many remote experiments, are typically only designed to run in a secured local area network and cannot safely be exposed to the internet because they lack a sufficiently robust security infrastructure. They also typically require the installation of proprietary software on the end user system which is an obstacle for deployment in learning scenarios at universities. Facing these challenges when bringing the chemical engineering WebLabs at the University of Cambridge online, the Computing center of the University of Stuttgart and the University of Cambridge developed a framework to allow the secure deployment of industrial controller software in remote learning applications;this framework is generic, has a low-barrier for students as it only requires an internet browser and Java™ installation, and it satisfies the high security demands of most university infrastructure providers. Furthermore, the framework has the potential to be applied to almost any remote laboratory setup and is compatible with all commonly-used operating systems at the user end. © 2012 IEEE.

关键词： Application programs

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Monitoring Pyrrol Polymerization Using On-Line Conductivity Measurements and Neural Networks

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Macromolecular Symposia 2013年第1期333卷

作者： Claiton Z. Brusamarello Leila M. Santos Monique Amaral Guilherme M. O. Barra Montserrat Fortuny Alexandre F. Santos Pedro Henrique Hermes de Araújo Claudia Sayer Process Control Laboratory Chemical and Food Engineering Department Federal University of Santa Catarina - UFSC Campus Universitário 88040-900 Florianópolis Santa Catarina Brazil Research and Technology Institute Tiradentes University - UNIT Av. Murilo Dantas 300 49032-490 Aracaju SE Brazil Polymer and Composites Laboratory Mechanical Engineering Department Federal University of Santa Catarina – UFSC Campus Universitário 88040-900 Florianópolis Santa Catarina Brazil

In this work, the chemical oxidative synthesis of polypyrrole was monitored through on-line conductivimetry. A group of reactions was carried out at two different temperatures (5 °C and 20 °C) with varying concentrations of pyrrole and oxidant agent (FeCl 3 ) to investigate the effect on conversion and conductivity. The relation of electrical conductivity with conversion was not straightforward. To overcome this, a neural network was proposed to predict conversion based on on-line conductivity measurements. In this way, the neural networks entry variables were: electrical conductivity, reaction temperature, initial oxidant and pyrrole concentrations. As optimization algorithms Levenberg-Marquardt and Descent Gradient with momentum term were evaluated. Results obtained by the neural networks based on on-line conductivity measurements showed a good agreement with off-line conversion data.

关键词： artificial neural networks conductivity polypyrrole

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A Mild, One‐Pot Stadler–Ziegler Synthesis of Arylsulfides Facilitated by Photoredox Catalysis in Batch and Continuous‐Flow†

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Angewandte Chemie 2013年第30期125卷

作者： Xiao Wang Gregory D. Cuny Timothy Noël Harvard NeuroDiscovery Center Harvard Medical School and Brigham & Women's Hospital 65 Landsdowne Street Cambridge MA 02139 (USA) Department of Pharmacological and Pharmaceutical Sciences College of Pharmacy University of Houston 549 A Science and Research Bldg 2 Houston TX 77204 (USA) Department of Chemical Engineering and Chemistry Micro Flow Chemistry & Process Technology Eindhoven University of Technology Den Dolech 2 5612 AZ Eindhoven (The Netherlands)

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An innovative scheduling coordination method for improved productivity and energy efficiency of a large-scale integrated steel plant

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IFAC Proceedings Volumes 2012年第23期45卷 250-255页

作者： Chaojun Xu Guido Sand Iiro Harjunkoski Sebastian Engell Process and Production Optimization ABB AG Corporate Research Center Germany Wallstadter Str. 59 68526 Ladenburg Germany (Tel: +49(0)6203-716044 e-mail: chaojun.xu@*** guido.sand@*** iiro.harjunkoski@***) Process Dynamics and Operations Group Department of Biochemical and Chemical Engineering TU Dortmund Emil-Figge-Str. 70 44227 Dortmund Germany (e-mail: s.engell@bci.tu-dortmund.de)

Energy efficiency will play an important role in improving the heavy industry's environmental and economic performance. In this work, an innovative scheduling coordination method to coordinate two consecutive production sections in an integrated steel plant - melt shop and hot rolling mill - is discussed. Between the two sections a slab yard acts as a buffer for intermediate products – slabs. Planning and scheduling of the two sections are currently solved independently by two industrial optimization solutions, observing complex production rules and different objectives. The proposed coordination method reuses the existing optimization modules and minimizes the storage time in the slab yard. Furthermore, the coordinated schedule enables some slabs from the melt shop to be charged directly into the reheating furnace of the hot rolling mill without losing considerable thermal energy (hot charging). The challenges and the approaches to coordinate two industrial schedulers incorporating several optimization steps, for instance mixed integer linear programming (MILP) and heuristics are presented. The coordination approach is validated by testing it with real production data from a real life steel plant and the potential to save energy and reduce production time is demonstrated.

关键词： Production and distribution planning industrial applications steel making and continuous casting hot rolling hot charging plant-wide planning and scheduling MILP scheduling coordination

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Mortality weighting-based method for aggregate urban air risk assessment

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2011年第9期12卷 702-709页

作者： Qing-yu ZHANG Guo-jin SUN Wei-li TIAN Yu-mei WEI Si-mai FANG Jin-feng RUAN Guo-rong SHAN Yao SHI Department of Environmental Engineering Zhejiang University Hangzhou 310058 China Department of Chemical Engineering Zhejiang University Hangzhou 310027 China Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control Hangzhou 311202 China College of Information University of International Business and Economic Beijing 100029 China

This paper deals with a mortality-weighted synthetic evaluation （MWSE） method for evaluating urban air risk. Sulphur dioxide （SO2）, nitrogen oxide （NOx）, and particulate matter （PMl0） were used as pollution indices. The urban area of Hangzhou, China is divided into 756 grid cells, with a resolution of 1 km× 1 km, and is evaluated using the MWSE and the air quality index （AQI）, a widely-used method to evaluate ambient air quality and air risk. In an evaluation of one day in April 2004, the surface areas categorized as levels Ⅰ and Ⅲ, as defined by the integrated air risk evaluation, were 27.3% and 3.3% lower, respectively, than grades Ⅰ and Ⅲ defined by the AQI evaluation. Meanwhile, the areas classified as level Ⅱ or above level Ⅲ by the integrated air risk evaluation were 55.1% and 101. 1% higher, respectively, than grade Ⅱ or above grade Ⅲ when using the AQI evaluation. From this comparison, we find that the MWSE method is more sensitive than the AQI method. The AQI method uses a single index to assess integrated air quality and is therefore unable to evaluate integrated air risks due to multiple pollutants. The MWSE method overcomes this problem, providing improved accuracy in air risk assessment.

关键词： Integrated air risk Mortality-weighted synthetic evaluation （MWSE） Air quality index （AQI） Air pollution

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The application of a model predictive control-based approach to CO2 capture processes: Towards operational cost minimisation

The application of a model predictive control-based approach...

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Sustainable engineering Forum: Core Programming Topic at the 2011 AIChE Annual Meeting

作者： Arce, Alicia Dowell, Niall Mac Shah, Nilay Vega, Lourdes F. MATGAS Research Center Barcelona Spain Chemical Engineering Imperial College London London United Kingdom Centre for Process Systems Engineering Department of Chemical Engineering Imperial College London London United Kingdom MATGAS Research Center and Carburos Metlicos Air Products Group Barcelona Spain

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The application of a model predictive control-based approach to CO2 capture processes: Towards operational cost minimisation 1

The application of a model predictive control-based approach...

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Separations Division - Core Programming Topic at the 2011 AIChE Annual Meeting

作者： Arce, Alicia Mac Dowell, Niall Shah, Nilay Vega, Lourdes F. MATGAS Research Center Barcelona Spain Chemical Engineering Imperial College London London United Kingdom Centre for Process Systems Engineering Department of Chemical Engineering Imperial College London London United Kingdom MATGAS Research Center Carburos Metlicos Air Products Group Barcelona Spain

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