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Current Issue
2012 Vol.29 Issue.6,
Published 2012-11-15
Article
Article
1
Synthesis, Characterization and Catalytic Property in Oxidative Carbonylation of Y-β Composite Zeolite
WANG Zeng-Zhu, HUANG Shou-Ying, WANG Sheng-Ping, MA Xin-Bin
Y-β composite zeolite was synthetized using preset crystal seeds method and characterized by FT-IR, SEM, BET and XRD. The characterization results indicated the Y-β composite zeolite had the structural feature of both Y and β zeolite instead of a mixture of them. The preparation conditions were investigated and it was found that crystallization time, SiO
2/
Al
2
O
3
ratio and alkalinity could affect the ratio of Y and β in composite zeolite. In addition, the activity of the catalyst in oxidative carbonylation was investigated. The results revealed that Y-β composite zeolite prepared at crystallization time of 180 h, SiO
2
/Al
2
O
3
ratio of 36, alkalinity of 1.8 showed relatively higher conversion of 1.3% and selectivity of 46.9%, in combination with the advantages of zeolite Y and β.
2012 Vol. 29 (6): 1-6 [
Abstract
] (
2384
) [
HTML
1KB] [
PDF
419KB] (
2636
)
7
Influence of Different Organic Additives on Properties of Ru
0.5
Ir
0.5
O
2
/Ti
WU Fang-Min, WANG Qing-Fa, WANG Li
Ti-based Ru
x
Ir
1-
x
O
2
coated anodes were prepared by sol-gel method with the addition of organic additives, such as tetraethyl ammonium hydroxide (TEAOH), tetrapropyl ammonium bromide (TPABr) and cetyltrimethylammonium bromide (CTAB), to the sols. The surface morphology, electrochemical properties and stability of anodes were characterized by scanning electron microscope (SEM), cyclic voltammetric (CV), polarization measurement and accelerated electrolysis test. It was found that the addition of TEAOH to the sols could increase significantly the real surface area of coatings and decrease the polarization of electrodes, resulting in the improvement of electrochemical activity while the high stability was kept.
2012 Vol. 29 (6): 7-10 [
Abstract
] (
1859
) [
HTML
1KB] [
PDF
476KB] (
2399
)
11
Evaluation of the Influence of Substitution Degree on Properties of Chitosan Based Photo-Crosslinked Hydrogel
SUN Da, WANG Hui, ZHU Chuan-Shun, YAO Fang-Lian
Chitosan, who has a great storage in nature, has a lot of advantages such as non-toxicity, biodegradability, biocompatibility and cytocompatibility. Therefore, it receives much attention in the field of biomedicine. In this article, high efficiency photo crosslinked hydrogel was prepared through the conjugation of 4-azidobenzoic acid with chitosan chains. To confirm the conjugation, methods of FT-IR and
1
H-NMR were employed. In order to have a deep understand of the properties of the hydrogels, tests of water loss rate, vapor transmittance and drug release were carried out, which especially focused on evaluating the influence of substitution degree of azides on properties of hydrogels. Results showed that, the substitution degree had certain influence on properties of hydrogels. Through understing of the influence, hydrogels can be made according to the requirements of the application areas.
2012 Vol. 29 (6): 11-15 [
Abstract
] (
3288
) [
HTML
1KB] [
PDF
427KB] (
2556
)
16
Kinetics Study on Nonisothermal Crystallization of 6-tert Butyl-3-methylphenol by Avrami-Ozawa Model
LI Zhi-Yong, ZHAO Yin, SUN Yan-Hong, CHEN Yan-Xin, YIN Qiu-Xiang, CHEN Wei
In this paper, the kinetic behavior of the static melt crystallization of 6-tertbutyl-3-methylphenol (3M6TB) was investigated by DSC at different cooling rates. The relationship between relative crystallinity and temperature at different cooling rates was determined. The experimental data was fitted with Avrami-Ozawa model and kinetic parameters such as
F
T
and
θ
were obtained. Both parameters increased with cooling rate so that the relative crystallinity of 3M6TB showed similar temperature dependence with them.
2012 Vol. 29 (6): 16-19 [
Abstract
] (
4311
) [
HTML
1KB] [
PDF
294KB] (
3363
)
20
Preparation and Properties of Interface Stabilized Flexible Cholesteric Liquid Crystal Devices
WANG Xiao-Li, ZHOU Xue-Qin, ZOU 南Zhi, TIAN Qi-Xiang, LIU Dong-Zhi, LI Wei
Interface stabilized flexible bistable cholesteric liquid crystal devices were prepared with ITO-PET films via filling method by treating the conductive surface with and using spacers to control the thickness of the device. The microstructure and morphology of the devices were studied using contact angle tester and microscope, and the electrical properties of the devices using Ultraviolet Visible Spectrophotometer(UVS). The results showed that the inductive effect of the interface coating effectively improved the stability of the liquid crystal alignments. Thus flexible bistable cholesteric liquid crystal devices were obtained using spacers of 6 μm size. The effective display area is 10 cm× 15 cm with a transmittance of 90% at 550 nm. Moreover, a character display experiment was carried out after treating the electrode with etching technology.
2012 Vol. 29 (6): 20-25 [
Abstract
] (
1352
) [
HTML
1KB] [
PDF
560KB] (
2594
)
26
Effect of Nonsolvent on the Performance of Cast SPEEK Membranes
ZHANG Li-Juan, ZHAO Shi-Xiong, WANG Yu-Xin
For the first time, membrane casting solution of sulfonated poly(ether ether ketone) (SPEEK) dispersed in the mixture of solvent dimethyl formamide (DMF) and nonsolvent (tetrachloroethylene or paraxylene) was used to prepare SPEEK electrolyte membranes. The proton conductivity, the water uptake and the water permeability of the membranes were measured and compared with those of membrane cast from SPEEK/DMF solution. The proton conductivity and water permeability were increased by around 30% and 50%, respectively. The introduction of nonsolvent to the casting solution caused aggregation of the SPEEK ionomers, which then affected the structure and performance of the resultant membranes. The improvement of proton conductivity and water permeability are of significance to enhancing the performance of polymer electrolyte membrane fuel cells.
2012 Vol. 29 (6): 26-29 [
Abstract
] (
2490
) [
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1KB] [
PDF
418KB] (
2960
)
30
Mo Loss-Inhibition in Ni-Al-Mo Ternary Alloy Spreading Process and Catalyst Performance
WANG Ji-Min, CHEN Huai-Jie, CHEN Xiang-Ping, LIN Tian-Sheng, WU Hao, CAO Hong-Yang
To enhance the performance of Mo-promoted Raney nickel catalyst, the loss by dissolution of molybdenum from Ni-Al-Mo ternary alloys, and effect of Mo-loss inhibition with adding sodium molybdate into initial caustic sodium solution during the Ni-Al-Mo ternary alloy spreading process were investigated. The catalytic performances in glucose hydrogenation of the catalysts prepared with or without the Mo-loss inhibition were studied contrastively，including recycle time, antitoxicity and catalytic activity in glucose hydrogenation of catalysts. Experimental results showed that the loss of molybdenum by dissolution from Ni-Al-Mo ternary alloy was obviously diminished with the Mo-loss inhibition during the alloy spreading process. It followed that the performances of the catalyst in glucose hydrogenation were improved, which including catalytic activity at first usage, recycle lifetime with critical dose, and anti-toxicity against saccharifying enzyme and sodium bisulfate.
2012 Vol. 29 (6): 30-35 [
Abstract
] (
2300
) [
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1KB] [
PDF
392KB] (
2992
)
36
Simulation on Instantaneous Release Diffusion of LPG under Wind Field
LIU Yu-Jin, TAN Wei, LIU Li-Yan, SU Yan-Xia
Liquefied petroleum gas (LPG) is a byproduct of the refinery industry during the catalytic cracking and pyrolysis of crude oil, consisting of propane, propylene, butane and butene which are flammable and explosive. Once the leakage occurs, it would lead to disastrous consequence. Based on the computational fluid dynamics (CFD), this paper carried out research on the diffusion and characters of the twophase cloud from an instantaneous release using commercial software Fluent under different wind field. The EulerLagrangian approach was applied to the simulation, where the continuous phase was computed by Euler method and droplets by Lagrangian method respectively, the effect of wind was analyzed from both the macroscopic cloud and microscopic droplet. Results showed that the cloud shape varied from the initial sphere to the ellipsoid along the horizontal direction, and the cloud moved faster at a higher wind speed while the concentration decreased at the same time. The lowest temperature continued to decrease during the dispersion to the bottom and then recover to the environment temperature gradually. The droplet velocity dropped rapidly as soon as entering into the atmosphere and followed the wind finally. It could be seen that wind field helped evaporation because the droplet diameter decreased if the wind velocity rose. The research of this paper can provide guidance for consequence and risk assessment for such accidents.
2012 Vol. 29 (6): 36-41 [
Abstract
] (
3063
) [
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1KB] [
PDF
415KB] (
2814
)
42
Simulation and Optimization on the Mixing Performance of Rotary Energy Recovery Device
YANG Yong-Jun, WANG Yue, ZHANG Jin-Xin, HAN Song, XU Shi-Chang, WANG Shi-Chang
Rotary energy recovery device (RERD), a significant equipment for Seawater Reverse Osmosis (SWRO), plays an important role in reducing the operating cost of the system. By using the computational fluid dynamics software of FLUENT, a threedimensional and unsteady Moving Mesh model of the RERD was firstly established. Effects of rotating speed and inlet flow rate on RERD’s stream salinity contours, volumetric mixing and efficiency were studied and analyzed, the optimum operational conditions to control the mixing below 4% and efficiency above 98% were gained at the same time. This simulation results can provide theoretical guidance for the practical development of RERD.
2012 Vol. 29 (6): 42-49 [
Abstract
] (
2206
) [
HTML
1KB] [
PDF
1130KB] (
2831
)
50
Simulation and Basic Experimental Study on the Increasing Pressure and Cooling Mode Using Inert Gas in Distillation
WU Zhen-Yu, ZHENG Cong, GAO Rui-Chang, BAI Peng, YU Li-Ming
An improvement on the intrinsic operation mode was proposed, based on the deficiency of ordinary cooling system in the distillation column, aiming at energy saving and environmental protection. The pressure and temperature of the high-temp vapor on the top of the column were elevated with the use of inert gas as compressed media, and heat exchange occurred in the heat exchanger. The latent heat of the condensate was fully utilized, and the purpose of cooling the top vapor was achieved at the same time. In this mode, the heat duty of the condenser in distillation system was reduced，at the meantime, the high cost and corrosivity of brine water in cooling system were avoided. In this work, Aspen Plus software was used to simulate the new process, with SRK equation as the thermodynamic model. The influence of compression ratio of the mixed gases, initial temperature of nitrogen and molar ratio of the mixed gases were investigated using the sensitivity analysis module in Aspen Plus. After that, the laboratory experiments were carried out, and the experimental results agreed well with simulation.
2012 Vol. 29 (6): 50-55 [
Abstract
] (
1941
) [
HTML
1KB] [
PDF
468KB] (
2386
)
56
Experimental Study on Heat Transfer Performance in Condensation Section of ThreePhase Flow Closed Gravity Heat Pipe
QI Guo-Peng, LIU Ze, JIANG Feng, LI Xiu-Lun
To expand the application fields of threephase flow heat transfer enhancing and fouling preventing technology, a three-phase flow closed gravity heat pipe was built to research the heat transfer performance. The effects of solid holdup, heating power, filling ratio on the heat transfer performance in condensation section were investigated. The results showed the three-phase flow closed gravity heat pipe could enhance heat transfer. The convective heat transfer coefficient in condensation section increases with increase in heating power, and decreases with increase in filling ratio. When the filling ratio is lower, the convective heat transfer coefficient in condensation increases as the solid holdup increases; but when filling ratio is higher, with the increase of solid holdup, the convective heat transfer coefficient decreases after the first increase, then increases again.
2012 Vol. 29 (6): 56-61 [
Abstract
] (
2479
) [
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1KB] [
PDF
726KB] (
3062
)
62
Development of Selective Ring Opening of Decalin
SUN Tang-Xu, WANG Qing-Fa, ZHANG Xiang-Wen
The stringent environment legislation request high standard of diesel to reduce the vehicle emissions, thus lower fuels densities and higher cetane numbers (CN) are required. One process to address this issue is selective ring opening of decalin to reduce the number of ring structures, while retaining the carbon number of a product molecule. This paper describes the mechanism of ring opening reaction of decalin and emphasized the importance of B-acid sites, then the acidity, porosity of zeolites are briefly introduced. Y zeolite is suitable for ring opening of decalin, the metal function is also discussed and two typical modes of adsorption of cycloalkanes in the metals of Pt, Ir have been compared. In the end, the future development is also given.
2012 Vol. 29 (6): 62-68 [
Abstract
] (
1652
) [
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1KB] [
PDF
339KB] (
3308
)
69
Biodesulfurization of Organic Sulfur in
n
-Hexadecane by
Rhodococcus
sp. H-412 Growing Cells
SHI Li-Na, HAN Zhen-Wei
The
Rhodococcus
sp. H-412 screened in our lab, which could desulfurize via 4S pathway, was selected as biocatalyst to study the desulfurization performance by its growing cells, dibenzothiophene (DBT) and
n-
hexadecane were used for model organic-sulfur compound and model oil, respectively. The desulfurization efficiency (
X
DBS
) of growing cells is higher than that of resting cells in the same biomass concentration when the oil phase was 20% (v/v). When initial biomass concentration was 0.048 g/L and DBT concentration was 0.25 mmol/L, the higher
X
DBS
was reached 57% under 20% (v/v) of hexadecane. The desulfurization by growing cells was carried out under the condition of 0%, 5%, 10%, 20% (v/v) of hexadecane, DBT consumption and 2-HBP formation increased with the increasing of oil phase, and the highest
X
DBS
was reached when the hexadecane was 20%. Biomass growth reduced with the increasing of oil volume, under oil-free condition, the biomass reached highest value.
2012 Vol. 29 (6): 69-73 [
Abstract
] (
3877
) [
HTML
1KB] [
PDF
352KB] (
2696
)
74
Progress of Supported Ionic Liquid Membrane Technology in Gas Separation
LI Hong-Hai, XU Bao-Ming, LI Jian-Long
The gas separation mechanism of supported ionic liquid membranes was analyzed. The ways for ionic liquid used as liquid phase in supported liquid membranes and the effects of different materials of membrane, different kinds of ionic liquids, hydrophilic and hydrophobic of membrane on the instability of supported ionic liquids membrane were summarized. The application of supported ionic liquid membranes in gas separation were reviewed. In the end, the prospects for the industrialization of supported liquid membranes were presented.
2012 Vol. 29 (6): 74-79 [
Abstract
] (
1976
) [
HTML
1KB] [
PDF
280KB] (
3175
)
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