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	1. Research of Catalyst Preparing 1,4-Naphthoquinone by Selective Air-catalytic Oxidation from Naphthalene
	CUI Tiebing,ZHANG Chen,LUO Tingliang,LIU Guoji
	Chemical Engineering 09 August 2011
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	Abstract:In this papeTaking naphthalene as raw material and V2O5 as key active component of catalyst to prepare 1,4-naphthoquinone by selective air-catalytic oxidation. The active component of the catalysts, co-catalyst, preparation method, and the proper reacting temperature can be determined through experiments. With V2O5 as key active component，further experiment demonstrated that compound catalyst are very beneficial to 1,4-naphthoquinone's selectivity; Choosing stannous sulfate and other metal compound as co-catalyst can make the catalyst get a higher selectivity for 1,4- naphthoquinone; It is showed in the study catalyst made by dip-molding has a higher activity and a better selectivity than that by precipitation method; The most proper reaction temperature is 643K, and the conversion rate of naphthalene, selectivity and yield of naphthoquinone achieved 90.11%、100%、90.11% respectively.
	TO cite this article:CUI Tiebing,ZHANG Chen,LUO Tingliang, et al. Research of Catalyst Preparing 1,4-Naphthoquinone by Selective Air-catalytic Oxidation from Naphthalene[OL].[ 9 August 2011] http://en.paper.edu.cn/en_releasepaper/content/4438233


	2. The HI catalytic decomposition in the lab-scale H2 production apparatus of the iodine-sulfur thermochemical cycle
	WANG Laijun,WANG Zhichao,ZHANG Ping,CHEN Songzhe,XU Jingming
	Chemical Engineering 21 April 2011
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	Abstract:The decomposition of HI is the key reaction to produce hydrogen in the Iodine-Sulfur thermochemical hydrogen production cycle (IS cycle). In this paper, the HI catalytic decomposition for the lab-scale H2 producing apparatus of IS-10 (H2 production rate is 10 L/h) was studied. The effects of different supports (carbon nanotubes, active carbon, carbon molecular sieve, graphite and Al2O3), catalyst particle sizes, and temperature on HI decomposition were investigated. Also, the fresh and used catalysts were characterized by XRD and BET. The results showed that the active carbon and carbon molecular sieve had the higher catalytic activity for HI decomposition than other supports. The active carbon was selected to support platinum to catalyze the HI decomposition in the IS-10. In the closed cycle operation, the conversion of HI over the active carbon supported platinum catalyst was more than 20 %, which was near the thermodynamic equilibrium value. The H2 production rate was about 10 L/h, which reached the designed value. The results of the characterization about the fresh and used catalysts indicated that the specific surface area decreased and the Pt particles size increased, which showed the stability of the catalyst should be improved.
	TO cite this article:WANG Laijun,WANG Zhichao,ZHANG Ping, et al. The HI catalytic decomposition in the lab-scale H2 production apparatus of the iodine-sulfur thermochemical cycle[OL].[21 April 2011] http://en.paper.edu.cn/en_releasepaper/content/4423559

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	3. Catalytic hydrogen iodide decomposition over carbon nanotubes supported Pt catalysts
	WANG Laijun,ZHANG Ping,WANG Zhichao,CHEN Songzhe,XU Jingming,CHEN Jing
	Chemical Engineering 12 March 2011
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	Abstract:Two kinds of Pt catalysts supported on carbon nanotubes (CNTs) were prepared by the electroless plating method and the impregnation-reduction method. Their catalytic activities were evaluated through hydrogen iodide decomposition in a fixed bed reactor under atmospheric pressure. The catalysts were characterized by XRD、BET and TEM, respectively. The results indicated that the CNTs supported Pt catalyst prepared by the electroless plating method had the higher activity for hydrogen iodide decomposition than that prepared by the impregnation-reduction method, because of the higher dispersion of the platinum nano-particles on the CNTs support.
	TO cite this article:WANG Laijun,ZHANG Ping,WANG Zhichao, et al. Catalytic hydrogen iodide decomposition over carbon nanotubes supported Pt catalysts[OL].[12 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4416054


	4. Numerical study of the effect of eddy-bubble interaction model onthe turbulent dispersed flow of gas bubbles in stirred tanks1
	HAN Luchang,LIU Yuejin,Luo Hean,Cao Yang,Bai Ge
	Chemical Engineering 12 January 2009
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	Abstract:In gas-liquid bubbly flow, due to marked density difference between gas and liquid phases, some no-drag forces, such as virtual mass force, pressure gradient force, etc., may become important. In this case, the effect of these no-drag forces on the turbulent dispersion of gas bubble should be considered. Buwa et al.[1] have used an eddy lifetime (EL) model to simulate the turbulent dispersion in bubble column and neglected the effect of these forces on the renew time scale of turbulent fluctuations, but our simulations showed the EL model wasn’t fully applicable to stirred tank because of high non-homogeneous turbulence. In this work, based on the analysis of forces exerted on gas bubble, we obtained an eddy-bubble interaction (EBI) model, which coupled the neglected the effect of these forces on the renew time scale of turbulent fluctuations, but our simulations showed the EL model wasn’t fully applicable to stirred tank because of high non-homogeneous turbulence. In this work, based on the analysis of forces exerted on gas bubble, we obtained an eddy-bubble interaction (EBI) model, which coupled the effect of no-drag forces and used the eddy-bubble interaction time as the renew time scale. The relationship of crossing time and eddy lifetime was discussed, and the radial, axial velocities and gas holdup distribution predicted by the EBI and EL models were also compared with the experimental data, we found that the crossing time showed obviously different from the eddy lifetime, the crossing time may be much smaller than the eddy lifetime in some positions and the EBI model predicted much bigger slip velocity in the discharge flow region and lower circulation region near the tank wall, and somewhat smaller axial velocity in the upper circulation part, the predicted gas holdup distribution showed a better agreement with the experiment data than that predicted by the EL model.
	TO cite this article:HAN Luchang,LIU Yuejin,Luo Hean, et al. Numerical study of the effect of eddy-bubble interaction model onthe turbulent dispersed flow of gas bubbles in stirred tanks1[OL].[12 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27673


	5. Measurement and Comparison of Gas Holdup Distributions in a Stirred Rushton Tank with γ-CT1
	LIU Yuejin,HAN Luchang,LUO Hean,BAI Ge
	Chemical Engineering 08 January 2009
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	Abstract:Three gas dispersion states in liquid — cup dispersion, critical dispersion and full dispersion in a standard gas-liquid stirred Rushton tank (20cm i.d.) were divided based on experimentally based on experimentally observed phenomena. Only those gas dispersion states that were over their corresponding critical gas dispersion states were of signification in industrial applications. Detailed cross-section CT scan images were obtained using a Cs-137 γ-CT scan setup in CREL for the tank at 3/4 dimensionless static liquid height at larger gas rates and higher impeller rotating speeds, when gas dispersion states were over the corresponding critical dispersion states, and their corresponding relationships of gas holdup distribution with dimension radius were established based on the CT images. The comparsions and analyses of the distributions of gas holdup at 3/4 dimensionless static liquid height were investigated based on the CT images and their corresponding digital distribution curves of gas hold up with dimension radius. The work done in this paper is of great significance in measurement and comparison of gas holdup distributions for gas-liquid stirred Rushton tanks.
	TO cite this article:LIU Yuejin,HAN Luchang,LUO Hean, et al. Measurement and Comparison of Gas Holdup Distributions in a Stirred Rushton Tank with γ-CT1[OL].[ 8 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27502


	6. Application of A Cleaner Tanning agent-THPC: Eco-friendly Material
	CHEN Hui,SHAN Zhihua
	Chemical Engineering 30 December 2008
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	Abstract:Cross-linking agents play an important part in the physical properties of collagen based biomaterials. Tetrakis hydroxymethyl phosphonium chloride (THPC) is an aldehydic tanning agent that is widely used to stabilize collagens in the leather industry. The exact mechanism that it reacts with collagens is, however, not well understood. In this study, the interaction of THPC, with collagens, has been investigated using a number of analytical techniques. Nuclear magnetic resonance (NMR) of THPC with a model collagen samples (ethylenediamine, glycin and hide powder) showed that THPC can form multipoint fixation pattern with amino groups of protein and improve the hydrothermal stability of collagen protein. Through tanning trials, we have reported simple and clean technology by using THPC compared to basic chromium sulphate (BCS), glutaraldehyde and oxazolidine E tanning systems. THPC process helps to reduce the chemical oxygen demand (COD), total dissolved solids (TDS) and formaldehyde content. Based on the results obtained, a scheme has been proposed that THPC tanning agent not only has advantages in reducing pollution loads but also seems to be techno-economically viable.
	TO cite this article:CHEN Hui,SHAN Zhihua. Application of A Cleaner Tanning agent-THPC: Eco-friendly Material [OL].[30 December 2008] http://en.paper.edu.cn/en_releasepaper/content/27136


	7. Molecule simulation for the feedstock of FCC gasoline secondary reactions by SOL combined with MC method
	Chen Chun,Yang Bolun,Yuan Jun
	Chemical Engineering 18 January 2008
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	Abstract:For the sake of reducing the olefin content and upgrading quality of FCC gasoline, the gasoline feedstock will pass through series of secondary reactions in a riser reactor. In order to completely analyze this process in theory, the properties of feedstock should be simulated in the molecule level. In this work, the feedstock was converted as molecule vector matrix by Structure Oriented Lumping (SOL), and the Monte Carlo (MC) method was employed to produce each molecule vector. Three samples of catalytic cracking gasoline which were taken from the industrial FCC units of China have been used to test the usefulness of proposed simulation method, and the properties of these samples were predicted. The predicted results agreed well with the feedstock analytical data.
	TO cite this article:Chen Chun,Yang Bolun,Yuan Jun. Molecule simulation for the feedstock of FCC gasoline secondary reactions by SOL combined with MC method[OL].[18 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18215


	8. Low-temperature catalytic combustion of methane over MnOx-CeO2 mixed oxide catalysts: Effect of preparation method
	Shi Limin,Wei Chu,Qu Fenfen,LuoShizhong
	Chemical Engineering 03 April 2007
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	Abstract:The effect of preparation method on MnOx-CeO2 mixed oxide catalysts for methane combustion at low temperature was investigated by means of BET, XRD, XPS, H2-TPR techniques and methane oxidation reaction. The catalysts were prepared by the conventional coprecipitation, plasma and modified coprecipitation methods, respectively. It was found that the catalyst prepared by modified coprecipitation was the most active, over which methane conversion reached 90% at a temperature as low as 390℃. The XRD results showed the preparation methods had no effect on the solid solution structure of MnOx-CeO2 catalysts. More Mn4+ and richer lattice oxygen were found on the surface of the modified coprecipitation prepared catalyst with the help of XPS analysis, and its reduction and BET surface area were remarkably promoted. These factors could be responsible for its higher activity for methane combustion at low temperature.
	TO cite this article:Shi Limin,Wei Chu,Qu Fenfen, et al. Low-temperature catalytic combustion of methane over MnOx-CeO2 mixed oxide catalysts: Effect of preparation method[OL].[ 3 April 2007] http://en.paper.edu.cn/en_releasepaper/content/11918


	9. Application of RTD for Measuring Dispersion Coefficient and Velocity
	Zhang Tongwang,Wang Tiefeng,Jinfu Wang
	Chemical Engineering 25 November 2005
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	Abstract:Although much research had been focused on the tail of RTD, few attentions were paid to the effect of white noise on the measurement results. The white noise was unavoidable in experiment. Different liquid velocity and dispersion coefficient would be obtained from the same raw experimental data by using different data processing methods. It is important to investigate the effect of white noise on the calculated parameters by using different data processing methods. The anti- disturbance ability of moment method and least square method were investigated. It showed that the anti-disturbance ability of the least square method is better than that of the moment method. Because of the peak overlapping in RTD curve of loop reactor, moment method cannot be used to calculate liquid velocity and dispersion coefficient, while the least square method is still available. Experiment was carried out to examine the practicability of the least square method in loop reactor. It was shown that the least square method is suitable to calculate the liquid velocity and dispersion coefficient in loop reactor.
	TO cite this article:Zhang Tongwang,Wang Tiefeng,Jinfu Wang. Application of RTD for Measuring Dispersion Coefficient and Velocity[OL].[25 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3789


	10. Mathematical models for macro-scale mass transfer in airlift loop reactors
	Zhang Tongwang,Zhao Bin,Jinfu Wang
	Chemical Engineering 24 November 2005
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	Abstract:Inter-phase mass transfer is an important issue for design and development of airlift loop reactors of high performance in either chemical or biochemical applications. Axial dispersion of both gas and liquid phases has been taken into account for modeling the mass transfer process in airlift loop reactors. The method of finite difference was used to solve the differential equation system of mass transfer model numerically. The numerical results show that the oxygen concentration of the gas phase can be considered as constant and the flow pattern of liquid phase as plug flow. Based on the conclusion obtained from numerical solution, the mass transfer model was simplified and analytical solution has been obtained. Comparison between the numerical and analytical solutions shows that the simplification of the model is reasonable and there is almost no influence on the calculating results. Experimental measurements on the mass transfer rate were carried out to verify the mathematical model. The comparison between the measured and calculated results shows that the mass transfer model has a satisfactory prediction ability and can be used to describe the mass transfer process in airlift loop reactors.
	TO cite this article:Zhang Tongwang,Zhao Bin,Jinfu Wang. Mathematical models for macro-scale mass transfer in airlift loop reactors[OL].[24 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3781

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