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	1. 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


	2. Highly Enantioselective HPLC Separation of 5-Methyl-5-phenylhydantoin on the Norvancomycin-bonded Chiral Stationary Phase
	Yang Yiwen,Su Baogen,San Hanwen,Ren Qilong
	Chemical Engineering 15 February 2007
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	Abstract:Enantiomers of 5-Methyl-5-phenylhydantoin (MPH) were separated on norvancomycin chiral stationary phase (NVC-CSP), which was prepared by covalently linking norvancomycin to acid-treated silica gel. Three mobile phase modes have been investigated: reversed phase, polar organic mode, and normal phase. MPH may be enantioseparated under the reversed phase and polar organic mode. There is no enantioseparation under the normal phase. The effects of composition, column temperature, pH, and flow rate of mobile phase on the enantioseparation were investigated. The enantioseparation by methanol/2% TEAA (pH 5.5) 10/90 at the flow rate 0.6 ml/min and 20篊 is excellent. The hydrophobic interactions and hydrogen bonding are the dominant interactions on enantioseparations between the analyte and macrocycle in this chromatographic system.
	TO cite this article:Yang Yiwen,Su Baogen,San Hanwen, et al. Highly Enantioselective HPLC Separation of 5-Methyl-5-phenylhydantoin on the Norvancomycin-bonded Chiral Stationary Phase[OL].[15 February 2007] http://en.paper.edu.cn/en_releasepaper/content/11167

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	3. Supports Effect in Nickel Phosphide Hydrodesulfurization Catalyst
	Teng Yang ,Wang Anjie ,Li Xiang ,Lu Mohong ,Hu Yongkang
	Chemical Engineering 08 November 2006
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	Abstract:Six kinds of materials (MCM-41, HY, mechanically mixed HY/MCM-41, SiO2, TiO2 and Al2O3) supported nickel phosphide catalysts were prepared by co-impregnation method and characterized by N2 BET specific surface area measurements, temperature-programmed reduction (TPR) and X-ray diffraction (XRD). Dibenzothiophene hydrodesulfurization (HDS) activities of these catalysts were measured at 553-613K and 4MPa in a three-phase fixed-bed reactor. Among these supports, siliceous MCM-41-supported nickel phosphide catalyst showed the best HDS activities because of its high surface area and week interaction with active compositions. Nickel phosphide supported on all aluminum containing supports showed lower activities, especially for Al2O3, as the aluminum in the support interacts strongly with phosphorous. An in-depth study on mechanically mixed HY/MCM-41-supported nickel phosphide showed that the properties of both HY and phosphide was destroyed with the aluminum phosphates formation, which reduced the HDS activities for catalysts.
	TO cite this article:Teng Yang ,Wang Anjie ,Li Xiang , et al. Supports Effect in Nickel Phosphide Hydrodesulfurization Catalyst[OL].[ 8 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9385


	4. Asymmetric Synthesis of (R)-2-trimethylsilyl-2-hydroxyl- propionitrile by (R)-oxynitrilase from Prunus Japonica
	Wu Hong,Zong Minhua,Huang Shunrong
	Chemical Engineering 23 October 2006
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	Abstract:Optically active silicon containing cyanohydrin: (R)-2-trimethylsilyl-2-hydroxyl- propionitrile was successfully synthesized by asymmetric transcyanation of acetyltrimethylsilane with acetone cyanohydrin in an aqueous/organic biphasic system catalyzed with (R)-oxynitrilase from defatted Prunus Japonica seed meal. Various influential variables were examined for better understanding of the reaction. Diisopropyl ether was found to be the best organic phase for the reaction among all the organic solvents explored. The optimum concentrations of acetyltrimethylsilane and acetone cyanohydrin, volume ratio of aqueous phase to organic phase, buffer pH value and the reaction temperature were 14 mmol ∙ L–1, 28 mmol ∙ L–1, 13% (by volume), 5.0 and 30 oC, respectively. Under the above optimal conditions, the initial reaction rate, the substrate conversion and the product enantiomeric excess were 1.34 mmol∙L–1 ∙ h–1, 99.0% and 99.0%, respectively.
	TO cite this article:Wu Hong,Zong Minhua,Huang Shunrong. Asymmetric Synthesis of (R)-2-trimethylsilyl-2-hydroxyl- propionitrile by (R)-oxynitrilase from Prunus Japonica [OL].[23 October 2006] http://en.paper.edu.cn/en_releasepaper/content/8912


	5. Modeling and Simulation of Extraction of Acetic Acid from Water
	Xiao Xianjiang ,Ding Ganhong ,Wang Lijun,Li Xi
	Chemical Engineering 11 May 2006
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	Abstract:Acetic acid extraction is an important operation in industrial field. This paper focuses on the modeling and simulation of the extraction tower. To simulate the column correctly, the liquid phase non-idealities were described by UNIQUAC model. The binary parameters were regressed from liquid-liquid equilibria experiment data. The model of the column was built by considering mass balance, equilibrium balance and summation equations. Newton-Raphson method was used to solve the non-linear equations. Model results agreed well with the industrial data
	TO cite this article:Xiao Xianjiang ,Ding Ganhong ,Wang Lijun, et al. Modeling and Simulation of Extraction of Acetic Acid from Water[OL].[11 May 2006] http://en.paper.edu.cn/en_releasepaper/content/6561


	6. Polymeric Biomaterialsfor Biological and Pharmaceutical Applications
	Wang Xue-Jun
	Chemical Engineering 05 December 2005
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	Abstract:Biomaterials may be defined as designed materials, which are used in contact and interact with tissue, blood, cells, proteins and any other living substance. The recent developments and applications of polymeric biomaterials in the field of drug delivery and tissue engineering were reviewed. The review suggests a potential future for biomaterials in the pharmaceutical, biomedical and biological fields.
	TO cite this article:Wang Xue-Jun. Polymeric Biomaterialsfor Biological and Pharmaceutical Applications[OL].[ 5 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4086


	7. Recent Developments in Asymmetric Diels-Alder Reaction
	Wang Xuejun
	Chemical Engineering 28 November 2005
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	Abstract:The Diels-Alder cycloaddition reaction’s widespread application is the introduction of up to four new contiguous asymmetric centers with good yields, high selectivity and predictability. 65 references were cited to review the recent developments in asymmetric Diels-Alder reaction, including the mechanism, the new catalysts and ligands, and the new applications.
	TO cite this article:Wang Xuejun. Recent Developments in Asymmetric Diels-Alder Reaction[OL].[28 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3798


	8. 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


	9. 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


	10. Flow behaviors in an external loop airlift reactor
	Zhang Tongwang,Wang Tiefeng,Jinfu Wang
	Chemical Engineering 24 November 2005
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	Abstract:The hydrodynamic behaviors in the heterogeneous flow regime in an external-loop airlift reactor with diameters of riser and down-comer 0.1 m were experimentally studied. The influences of solid concentration, flow resistance of the down-comer and liquid level in the separator were considered with solid volume fraction up to 20 %. The results show that gas holdup and liquid circulation velocity decrease with increasing solid concentration. The gas holdup increases and the liquid circulation velocity decreases with decreasing valve opening and liquid level in the separator. A mathematical model was established based on momentum balance and energy balance, and the axial gas-liquid average slip velocity was obtained which coincides with the slip velocity defined in literatures when the height approaches zero. Comparison between experimental and predicted values shows that the model is reasonable.
	TO cite this article:Zhang Tongwang,Wang Tiefeng,Jinfu Wang. Flow behaviors in an external loop airlift reactor[OL].[24 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3768

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