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	1. 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


	2. Enzymatic regioselective palmitoylation of 5-?uorouridine catalyzed by Lipozyme TL IM in co-solvent mixture
	Wu Hong,Hou Xuedan,Zong Minhua
	Chemical Engineering 17 January 2011
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	Abstract:A mild, ef?cient and regioselective enzymatic procedure has been successfully conducted for the synthesis of 5'-O-palmitoyl-?uorouridine, a potential prodrug of 5-?uorouridine, from 5-fluorouridine and vinyl palmitate with Lipozyme TL IM in acetone-THF (85/15, v/v) co-solvent mixture. Addition of molecular sieves into the reaction mixture can effectively removed the water, which was proved to cause the hydrolysis of a large amount of acyl donors, thus greatly lowering the acyl donors used. In the presence of molecular sieves, the optimal molar ratio of vinyl palmitate to 5-FUR, enzyme dosage, temperature and shaking rate were 2:1, 15 mg/ml, 40 ℃ and 200 r/min, respectively, under which the initial reaction rate, yield and regioselectivity were 12.3 mM/h, 98.6% and >99%, respectively after 8 hours. Moreover, Lipozyme TL IM displayed a good operational stability and 96.3% of its original activity was maintained after being reused for 10 cycles.
	TO cite this article:Wu Hong,Hou Xuedan,Zong Minhua. Enzymatic regioselective palmitoylation of 5-?uorouridine catalyzed by Lipozyme TL IM in co-solvent mixture[OL].[17 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4406894

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	3. Effect of anode composition on the electrochemical properties of the direct hydrazine fuel cell
	Ye Liqiang,Li Zhoupeng
	Chemical Engineering 09 June 2010
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	Abstract:A composite catalyst has been prepared by mixing Ni powder, surface-treated Zr-Ni alloy and Pd/C and used as the anode catalyst in the direct hydrazine fuel cell (DHFC). The catalytic activity of these catalysts is evaluated by linear potential sweep, electrochemical impedance spectra (EIS) analysis, polarization measurement. A maximum power density of 106 mW cm-2 has been achieved by using the composite catalyst as the anode catalyst and Pt/C as the cathode catalyst at 0.407 V under ambient conditions. It is found that the composite catalyst shows lower polarization than other catalysts. Results from linear potential sweep and EIS confirm that the cell performance is determined by the anode electrocatalysis towards the oxidation of hydrazine.
	TO cite this article:Ye Liqiang,Li Zhoupeng. Effect of anode composition on the electrochemical properties of the direct hydrazine fuel cell[OL].[ 9 June 2010] http://en.paper.edu.cn/en_releasepaper/content/4375570


	4. BIODEGRADABILITY EVALUATION OF TYPICAL LEATHER CHEMICALS (II)-THE BIODEGRADATION BEHAVIOURS OF ORGANIC TANNING AND RETANNING AGENTS ON ACTIVATED SLUDGE
	Sun Danhong,Shi Bi
	Chemical Engineering 13 January 2010
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	Abstract:The biodegradabilities of three kinds of typical organic tanning and/or retanning agents, namely aromatic syntans, aldehyde tanning agents and acrylic syntans, were studied in this paper. The results showed that the biodegradation behaviours of the leather chemicals are closely associated with their molecular weight and structure together with their chemical composition. It is suggested that the employment of organic tanning and/or retanning agents in leather industry might result in different environmental impacts even for the same kind of syntans. The tested four aromatic syntans (SGP, PGP, KWOP and BS) exhibited different but generally low biodegradability. The phenol syntan SGP could not be biodegraded, and the phenol-sulphone syntan PGP exhibited strong inhibitory effects on activated sludge respiration. Comparatively, the naphthalene syntan BS and the phenol syntan KWOP showed somewhat better biodegradability. In the case of aldehyde tanning agents, both formaldehyde and glutaraldehyde are toxic to activated sludge organisms, and comparatively the latter is potential to cause more severe environmental problem when it was used in leather industry. However, an aliphatic aldehyde product, namely syntan SH, did not show toxicity to activated sludge and it was biodegradable when it was at the concentrations tested. As far as acrylic syntans were concerned, the results indicated that the commercial anionic products (R83, B7815, ART-I and ART-II) were not so much inhibitory but were hardly biodegraded. However, a cationic product ART-III is potential to inhibit the activated sludge process in the effluent treating yard of tannery when it presented at high content.
	TO cite this article:Sun Danhong,Shi Bi. BIODEGRADABILITY EVALUATION OF TYPICAL LEATHER CHEMICALS (II)-THE BIODEGRADATION BEHAVIOURS OF ORGANIC TANNING AND RETANNING AGENTS ON ACTIVATED SLUDGE[OL].[13 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38881


	5. Biodegradability Evaluation of Typical Leather Chemicals (Iii)-The Biodegradation Behaviours of Vegetable Tannin Extracts
	He Qiang,Shi Bi
	Chemical Engineering 11 January 2010
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	Abstract:The short- and long-term biodegradation behaviours of wattle, bayberry, valonia and chestnut tannin extracts, widely employed as vegetable tanning agents in leather industry, were studied in this paper. The results indicated that the four tannin extracts are biodegradable and should not show toxic effects on the respiration of activated sludge organisms. It is proved that the short-term biodegradabilities of the four tannin extracts are concentration dependent. Low concentration of the tannin extracts could be effectively biodegraded, but the biodegradation processes should be retarded when they present in wastewater at high concentrations, owing to the inhibitory effects of tannins on activated sludge process. In general, the short-term biodegradability of the four tannin extracts follows the sequence: valonia>chestnut>bayberry>wattle. The long-term biodegradation behaviours of the four tannin extracts showed that they could be thoroughly biodegraded with the prolongation of activated sludge process, even if they present in wastewater at high concentrations. It is therefore suggested that both the condensed tannin extracts (wattle and bayberry extracts) and the hydrolysable ones (valonia and chestnut extracts) are environmentally friendly leather chemicals, in consideration of their biodegradabilities.
	TO cite this article:He Qiang,Shi Bi. Biodegradability Evaluation of Typical Leather Chemicals (Iii)-The Biodegradation Behaviours of Vegetable Tannin Extracts[OL].[11 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38771


	6. Catalytic Oxidative Desulfurization of Diesel Fuel Catalyzed by Quaternary Ammonium Phosphomolybdate
	Jianghua Qiu,Guanghui Wang,Danlin Zeng
	Chemical Engineering 07 September 2009
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	Abstract:Phosphomolybdic acid mixed with hexadecyl trimethyl ammonium chloride as the catalyst was prepared and evaluated for the oxidative desulfurization of straight-run diesel using hydrogen peroxide as an oxidant. Results of the FT-IR and SEM analyses indicated that the catalyst keeps the entire Keggin structure of phosphomolybdic acid. The catalyst can oxidize the sulfur-containing molecules into sulfones with desulfurization rate of 84.6% and diesel recovery rate of 98.1% in 2 h. Orthogonal test and single factor analysis showed that the catalyst dosage, hydrogen peroxide dosage, reaction temperature and reaction time are the main influential factors for oxidative desulfurization, and the influential factors order is: reaction time > reaction temperature > hydrogen peroxide dosage > catalyst dosage. Increasing extraction times, the desulfurization rates increased, but the recovery rates of diesel declined notably. The proposed catalytic oxidative mechanism of organosulfur compounds contains two steps, the active center Mo(Ⅵ) attacked by hydrogen peroxide catalyzes sulfide to form sulfoxide and subsequent oxidation of sulfoxide to produce sulfone.
	TO cite this article:Jianghua Qiu,Guanghui Wang,Danlin Zeng. Catalytic Oxidative Desulfurization of Diesel Fuel Catalyzed by Quaternary Ammonium Phosphomolybdate [J].


	7. Synthesis and characterization of novel Λ-shape heterocyclic azo chromophores
	Jia Dai,Yuming Zhou,Man He,Yiping Cui,Tong Zhang
	Chemical Engineering 20 May 2009
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	Abstract:A facile high yield synthetic route has been established for the synthesis of hyperbranched heterocyclic azo chromophores. These chromophores were intentionally designed as a dendritic structure to study structure-property relationships. These chromophores have been studied with respect to their solvatochromism and thermal behaviour. Molecular structural characterization for the resulting chromophores was achieved by 1H NMR, FT–IR, Elements Analysis, UV-vis spectra and TG. The chromophores exhibit excellent solubility in common organic solvents, high transparency and thermal stability up to 254℃.
	TO cite this article:Jia Dai,Yuming Zhou,Man He, et al. Synthesis and characterization of novel Λ-shape heterocyclic azo chromophores[OL].[20 May 2009] http://en.paper.edu.cn/en_releasepaper/content/32376


	8. 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


	9. 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


	10. 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

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