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China Petroleum Processing & Petrochemical Technology 2020年第4期22卷 117-125页

作者： Mohsin Ali Liao Zuwei Yao Yang Sun Jingyuan Jiang Binbo Wang Jingdai Yang Yongrong Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027 State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027

Ethane steam cracking process in an industrial reactor was *** one-demsional(1D)steady-state model was developed firstly by using an improved molecular reaction scheme and was then simulated in Aspen Plus.A comparison of model results with industrial data and previously reported results showed that the model can predict the process kinetics more *** addition,the validated model was used to study the effects of different process variables,including coil outlet temperature(COT),steam-to-ethane ratio and residence time on ethane conversion,ethylene selectivity,products yields,and coking ***,steady-state optimization was conducted to the operation of industrial *** COT and steam-to-ethane ratio were taken as decision variables to maximize the annual operational profit.

关键词： ethane steam cracking tubular reactor Aspen Plus molecular reaction scheme process simulation process optimization

MULTIPLICITY OF COUNTERCURRENTLY WALL-COOLED tubular FIXED-BED reactor UNDER TWO-DIMENSIONAL MODELING

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Progress in Natural Science:Materials International 1992年第4期 319-331页

作者：程迎生袁渭康 National United Chemical Engineering Laboratory East China University of Chemical Technology PRC Shanghai 200237

Regions of multiplicity existence for a countercurrently wall-cooled tubular fixed-bed reactor arestudied via the two-dimensional pseudo-homogeneous *** method is chosenfor numerically analyzing model equations to obtain the ignition and extinction pairs,which are appliedto determining multiple steady state *** and temperature distributions are shown asmultiplicity *** spaces are used to illustrate the effects of several major dimensionless *** between one-dimensional model and two-dimensional model is made,showing the influenceof Biot number upon the results.

关键词： tubular reactor two-dimensional model multiplicity

Kinetic study for the oxidation of cyclohexanol and cyclohexanone with nitric acid to adipic acid

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Chinese Journal of Chemical Engineering 2021年第1期34卷 183-189页

作者： Detao Pan Guangxiao Li Yuanhai Su Huilong Wei Zhenghong Luo Department of Chemical Engineering School of Chemistry and Chemical EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

The adipic acid is an important intermediate in the production of nylon,polyurethane and polye ster resin *** industrial approach for preparing adipic acid is through the liquid catalytic oxidation of KA oil with nitric *** this work,a comprehensive model is developed for this reaction based on the kinetic study conducted in a continuous flow tubular *** kinetic model fits well with the experimental results across the experimental conditions,and the average relative error between the calculated and experimental values is 5.7%.Results show that there was an induction period at the early stage of ***,it is found that at temperature range of 328-358 K,the formation rate of adipic acid strongly dependents on the temperature and nitric acid *** developed model is used to predict the yield of adipic acid at 359-368 *** work in this study could provide much knowledge for industrial tubular reactor design.

关键词： Adipic acid Nitric acid tubular reactor Kinetic model

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 ***,this process suffers from some problems,e.g.,severe corrosion of the reactor,high safety risk,and the regeneration of the *** this paper,a flow process as performed in the tubular reactor was *** 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 *** 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 *** deactivation of the common catalyst,antimony pentachloride,was investigated by catalyst concentration curve and XPS *** 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

Natural gas pyrolysis in double-walled reactor tubes using thermal plasma or concentrated solar radiation as external heating source

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Journal of Natural Gas Chemistry 2009年第1期18卷 1-8页

作者： Stphane Abanades Stefania Tescari Sylvain Rodat Gilles Flamant Processes Materials and Solar Energy Laboratory (PROMES-CNRS) 7 Rue du Four Solaire 66120 Font-Romeu France

The thermal pyrolysis of natural gas as a clean hydrogen production route is examined. The concept of a double-walled reactor tube is proposed and implemented. Preliminary experiments using an external plasma heating source are carried out to validate this concept. The results point out the efficient CH4 dissociation above 1850 K （CH4 conversion over 90%） and the key influence of the gas residence time. Simulations are performed to predict the conversion rate of CH4 at the reactor outlet, and are consistent with experimental tendencies. A solar reactor prototype featuring four independent double-walled tubes is then developed. The heat in high temperature process required for the endothermic reaction of natural gas pyrolysis is supplied by concentrated solar energy. The tubes are heated uniformly by radiation using the blackbody effect of a cavity-receiver absorbing the concentrated solar irradiation through a quartz window. The gas composition at the reactor outlet, the chemical conversion of CH4, and the yield to H2 are determined with respect to reaction temperature, inlet gas flow-rates, and feed gas composition. The longer the gas residence time, the higher the CH4 conversion and H2 yield, whereas the lower the amount of acetylene. A CH4 conversion of 99% and H2 yield of about 85% are measured at 1880 K with 30% CH4 in the feed gas （6 L/min injected and residence time of 18 ms）, A temperature increase from 1870 K to 1970 K does not improve the H2 yield.

关键词： methane hydrogen thermal cracking plasma concentrated solar energy tubular reactor

Calculation of the Average Irradiance and the Microalgae Growth for a Year at CUET, Bangladesh

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American Journal of Computational Mathematics 2016年第3期6卷 237-244页

作者： Ismot Ara Khanam Ujjwal Kumar Deb Department of Mathematics Chittagong University of Engineering & Technology Chittagong Bangladesh

The light is one of the important factors for the microalgae growth in the biofuel technology. As biofuel project is large and expensive thus before setting a microalgae based biofuel project in any geographical location, it is important to investigate the suitability of all important parameters involving with the system. This paper aims to investigate the sunlight availability and the microalgae growth for a photobioreactor at Chittagong University of Engineering and Technology (CUET). A computational growth model related to the average irradiance is proposed to calculate the growth of microalgae. We observed that average irradiance is the highest in June and is the lowest in December. From our simulation it is found that the growth of microalgae varies with the average irradiance in a year.

关键词： Biofuel Microlagae Light Irradiance tubular reactor Simulation

Model Reduction for Spatio-temporal Systems based on KPCA and LS-SVRM

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Model Reduction for Spatio-temporal Systems based on KPCA an...