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Current Issue
2013 Vol.30 Issue.3,
Published 2013-05-15
Article
Article
1
Preparation of Cu-MCM-41 Catalyst and Catalytic Performance for Hydrogenation of Dimethyl Oxalate to Ethylene Glycol
CHI Han-Wen, ZHAO Yu-Jun, WANG Sheng-Ping, XU Yan, 吕Jing , MA Xin-Bin
Mesoporous Cu-MCM-41 catalyst was successfully synthesized and its textural and reduction properties were characterized by BET, TEM, XRD and TPR. The results indicated that the catalyst had regular mesoporous structure and copper was highly dispersed on MCM-41 supporter. Gaseous hydrogenation of DMO reaction was carried out to investigate the catalytic performance of Cu-MCM-41 catalyst. The tests of reaction parameters indicated that reaction temperature, pressure, H
2
/DMO ratio and liquid hourly space velocity (LHSV) all have much effect on the catalytic performance. The optimum reaction conditions were: reaction temperature 473 K, pressure 2.5 MPa, H
2
/DMO ratio 80—100. Under these conditions, DMO could be fully converted and the selectivity of EG was over 98% at LHSV as 2.0 h
-1
.
2013 Vol. 30 (3): 1-6 [
Abstract
] (
1862
) [
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1KB] [
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2934KB] (
1587
)
7
Optimization of
β
-Mannanase Production by
Neosartorya fischeri
G5 Using Response Surface Methodology
GUAN Cong-Xiao, SHAO Ming-Yang, HU Zong-Fu, ZHANG Yan-Fei, QIAO Jian-Jun
The response surface methodology (RSM) was used to obtain optimal medium components for
Neosartorya fischeri
G5
β
-mannanase production. 8 factors were selected for Plackett-Burman design based on single factor experiment to evaluate the influence. The steepest ascent experiment and central composite design were adopted for further optimization. Design-Expert statistic methods were used for quadratic regression model equation to find out the optimum concentration levels and the relationships among factors. The optimal medium consisted of guar gum 13.0 g/L, peptone 11.0 g/L, yeast powder 5.0 g/L, MgSO
4
1.0 g/L, KH
2
PO
4
0.5 g/L, NaCl 0.6 g/L and CaCl
2
0.6 g/L at pH 4.0, and the final enzyme yield was more than twice of the original.
2013 Vol. 30 (3): 7-12 [
Abstract
] (
1957
) [
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1KB] [
PDF
1044KB] (
1593
)
13
Investigation on Continuous Crystallization Kinetics of Trisodium Citrate Pentahydrate
ZHAO Yin, GAO Jun-Yan, WANG Yan-Lei, LI Zhi-Yong, CHEN Wei
The continuous crystallization process of trisodium citrate pentahydrate was investigated. The particle size distribution of trisodium citrate pentahydrate in continuous crystallization process was measured using Malvern sizer equipment. Using these data and size-independent growth model, the nucleation and growth equations of trisodium citrate pentahydrate were determined. It was shown that the nucleation rate of trisodium citrate pentahydrate was more sensitive to supersaturation than the growth rate. It can be deduced that average particle size will be smaller when the supersaturation of solution is increased.
2013 Vol. 30 (3): 13-16 [
Abstract
] (
3664
) [
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1KB] [
PDF
884KB] (
1930
)
17
Synthesis of Bis-Thiourea Derivatives and Study of Their Gel Properties
WANG Shu-Cheng, CHAI Wei, HUANG Yao-Dong
Two series of bisthiourea derivatives 6a—d and 7a—d were synthesized and their gelling properties were checked. The results showed that 6a—d had stronger gelation ability than 7a—d. The structures of gels were investigated using concentrationdependent SEM,
1
H NMR, FT-IR and XRD. It was found that intermolecular hydrogen bonds were the main driving force for the gelation. The results of XRD suggested that the dry gels of 6c had columnar hexagonal structure while 7c was layered.
2013 Vol. 30 (3): 17-23 [
Abstract
] (
1507
) [
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1KB] [
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2122KB] (
1518
)
24
Synthesis of Diethyl (3-Pyridyl) borane
ZHANG Jing, JIN Feng-Min
Diethyl (3-pyridyl) borane was prepared from 3-bromopyridine and diethylmethoxyborane. The effects of reaction time,temperature and molar ratio of the material on the reaction were studied. The experimental result showed that the optimum condition were: reaction time was 6 h, reaction temperature was 0—5 ℃, dropping time of diethylmethoxyborane was 30 min, molar ratio of 3-bromopyridine to diethylmethoxyborane was 0.9∶1.0, and molar ratio of diethylmethoxyborane to isopropyl magnesium chloride was 1.0∶1.0. The product was white solid with melting point of 172—175 ℃, the yield of product was up to 81%. IR and MS were used to characterize the structure of product.
2013 Vol. 30 (3): 24-27 [
Abstract
] (
2580
) [
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1KB] [
PDF
959KB] (
2394
)
28
Mimic Enzyme Catalytic Reaction of MPc/SBA-15
CHEN Wei, PANG Mei-Ling, DAN Qiu-Jie, LI Ting-Ting
α
-Octo-Butoxy phthalocyanin cobalt (CoPc) and
α
-octo-butoxy phthalocyanin copper (CuPc) were loaded on mesoporous molecular sieves SBA-15 by impregnation to obtain CoPc/SBA-15 and CuPc/SBA-15 catalysts. UV-Vis absorption spectra, infrared spectra (IR), N
2
adsorption were used to characterize the target product. The experimental results indicated that both CoPc/SBA-15 and CuPc/SBA-15 exhibited good catalytic properties, the conversion rate of CuPc/SBA-15 to mercaptoethanol was greater than that of CoPc/SBA-15 to mercaptoethanol. The catalyst showed excellent activity in the reaction with kinetic characteristic of peroxidase. The reaction conformed with Michaelis kinetic equation. The Michaelis constant and maximum reaction rate were 27.23 mmol/L and 1.72×10
-4
L/min, respectively, and the activation energy of the CuPc/SBA-15 calculated was 29.17 kJ/mol.
2013 Vol. 30 (3): 28-32 [
Abstract
] (
3410
) [
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1KB] [
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1563KB] (
1576
)
33
Catalytic Activity of Modified HZSM-5 on Hydration of Cyclohexene
LI Ya-Nan, WANG Bao-He, ZHU Jing
A method of modify HZSM-5 by using niobium oxalate ammonium is introduced. We studied the surface acidity of Nb/HZSM-5 with different Nb content and the catalytic activity of cyclohexene hydration reaction. XRD and BET characterization results showed that: niobic acid had been highly dispersed, when Nb
2
O
5
was added to HZSM-5 with suitable amount, the modified Nb/HZSM-5 showed a preservation of the zeolite structure; Py-TPD showed that the introduce of the niobium avoiding the dehydroxylation of zeolite which led acid reduction, and also increased the framework stability of zeolite catalyst. Loading with 6%(wt%)Nb
2
O
5
, calcined at 450 ℃ for 4 h got the highest catalytic activity, which the conversion of cyclohexene was 14.7% and the selectivity of cyclohexanol was 99.7%.
2013 Vol. 30 (3): 33-37 [
Abstract
] (
1682
) [
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1KB] [
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1180KB] (
1584
)
38
Preparation of CrossLinked Aggregates of Aminoacylase by Using Dual CrossLinkers
YU Shun-Lei, ZHAO Lin, DONG Tao, TAN Xin, LIU Chang-Guang
The crosslinked enzyme aggregate (CLEA) of aminoacylase (EC 3.5, 1.14) from aspergillus melleus was prepared by precipitation with ethanol and crosslinking with glutaraidehyde and ethylene glycol diglycidyl ether (EGDE) as crosslinkers. The various crosslinked parameters were optimized. Almost 63.42% activity of CLEA of aminoacylase remained by using 90% (V/V) ethanol, followed by cross-linking 12 h with glutaraidehyde and EGDE at 30 ℃, the mass ratio was 1.00∶0.75∶2.00. The stability of aminoacylase was enhanced after immobilization. The thermal deactivation model was changed from oneexponential model (free enzyme) to twoexponential model. Free enzyme lost almost all of activity, while aminoacylase CLEA 43% of initial activity. Even at 57 ℃ after 24 h, 32% of initial activity was retained. Additionally, the reusability of the CLEA was evaluated. Aminoacylase CLEA showed 72% residual activity after 10 cycles of repeated use.
2013 Vol. 30 (3): 38-43 [
Abstract
] (
1470
) [
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1KB] [
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878KB] (
1620
)
44
Evaluation of Microemulsion Using Eucalyptus Oil in Transdermal Drug Delivery System
QIU Shao-Feng, LI De-Xin, WEI Zhen-Ping
The effectiveness of eucalyptus oil microemulsion in transdermal drug delivery system was evaluated. Felodipine was used as model drug. Nine o/w microemulsion formulations were prepared using oleic acid, IPM and eucalyptus oil as oil phases respectively. The physicochemical parameters were measured and skin permeation experiment in vitro was investigated. The drug loading, permeation rate and lag time were compared and optimized formulation was composed of eucalyptus oil (5%, w/w), Tween 80 (27.5%, w/w), ethanol (27.5%, w/w) and water (40%, w/w). And the skin irritation study was performed using the optimized formulation. The eucalyptus oil showed high emulsification capacity, high solubility of lipophilic drugs, high permeation enhancement effect and good stability. However, eucalyptus oil possessed a certain skin irritation, so it should not be excessive.
2013 Vol. 30 (3): 44-49 [
Abstract
] (
1446
) [
HTML
1KB] [
PDF
1666KB] (
1530
)
50
Metal Ion Modified Anionic Surfactant Templated Mesoporous Silica Adsorption Materials for the Removal of Dimethyl Sulfide
ZHANG Xiao-Dan, HU Zhi-Hui, ZHANG Dong-Hui
The metal ion modified anionic surfactant templated mesoporous silica (AMS-2) materials were used as adsorbents to remove the dimethyl sulfide (DMS) which was considered to be the most difficultly removed organic sulfide at ambient conditions in the fuel cell industry. The performance of these M-AMS-2 materials which were prepared by changing different metal ion solutions, reaction time, concentration and volume of the modified solutions, calcination temperature and so on as DMS adsorbents was tested using a dynamic breakthrough test in the fixed bed. It has been proved that the capacities for DMS removal can reach to 9.811 1 and 14.250 8 mg/g of Cu-AMS-2 and Ag-AMS-2 materials respectively. Comparing the cost of the Cu-AMS-2 and the Ag-AMS-2 materials, the Cu-AMS-2 material will be applied widely in the future.
2013 Vol. 30 (3): 50-54 [
Abstract
] (
1743
) [
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1KB] [
PDF
1678KB] (
1663
)
55
Preparation Process of Silicate-Calcium-Potassium Fertilizer Based on Simplex Method
HU De-Geng, ZHU Yun-Qin, WANG Chao-Jun, GUO Shu-Qin
Phocphogypsum calcium slag and insoluble potassium-containing silicate rock as main materials were mixed with certain mixture ratio, through the processes of briquetting, calcining under high temperature and smashing, silicate-calcium-potassium fertilizer was produced. By simplex method, the influence on making silicate-calcium-potassium fertilizer was investigated through ten experiments and the optimal process condition was obtained: the raw material ratio was 1.41∶1.00, calcine time was 33 min, calcining temperature was 1 160 ℃. The reaction process was analyzed with thermal analysis. Infrared spectrometer and electron microscope were performed to analyze the structure and morphology. The results showed the quality of the product was Grade one in the enterprise standard.
2013 Vol. 30 (3): 55-59 [
Abstract
] (
1711
) [
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1KB] [
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1079KB] (
1489
)
60
Experimental Investigation on Particle Atomization Performance of Air Atomizing Nozzle
LIU Li-Yan, YANG Jing, KONG Qing-Sen, WANG Chu-Chen, TAN Wei
The particle size distribution of a common air atomizing nozzle with small flow was measured by LSA-Ⅲ laser particle sizer. The experiment was mainly focused on particle size distribution along the different axial position in the condition of different gas-liquid ratio, gas pressure and liquid pressure. The experimental results show that both gasliquid ratio and gas pressure have influence on particle size, the effect of gas pressure is the biggest, then is the gas-liquid ratio and liquid pressure is smallest. According to this experimental condition, the surface area average diameter and volume average diameter of droplet changing at the axial distance of 100 mm, 200 mm, 300 mm, 400 mm and 500 mm are undulatory. By data analysis of the experimental results of droplet size distribution, the characteristic parameters of and
n
in RosinRammler distribution function could be obtained, and the theory foundation of quantitative calculation for droplet size was provided.
2013 Vol. 30 (3): 60-65 [
Abstract
] (
3319
) [
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1KB] [
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1610KB] (
1572
)
66
Pressure Drop and Particles Distribution in the Vapor-Liquid-Solid Multi-Pipe Circulating Fluidized Bed Evaporator
QI Guo-Peng, WANG Bing-Bing, JIANG Feng, LI Xiu-Lun
A transparent multi-tube vapor-liquid-solid circulating fluidized bed evaporator was designed and built to research the pressure drop and distribution of solid particles in the heating pipe bundle. The effects of circulating flow rate, heat flux and amount of additive particle on pressure drop and distribution of solid particles in the heating pipe bundle were investigated using the pressure sensors and CCD image gathering and processing system. The results show that as the circulating flow rate and additive particle amount increase, the nonhomogeneity of particle distribution decreases and the pipe bundle pressure drop increases; while the heat flux increases, the nonhomogeneity of particle distribution decreases and the pipe bundle pressure drop fluctuates, but the pipe bundle pressure drop value is always less than the value gathered when the heating power is zero.
2013 Vol. 30 (3): 66-70 [
Abstract
] (
1859
) [
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1KB] [
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1681KB] (
1513
)
71
Development and Application of Flux Balance Analysis Methods for Large-Scale Metabolic Networks
LI Hui, MA Hong-Wu, HAO Tong
The availability and utility of large-scale metabolic networks for analyzing the internal complicated mechanism of organisms have been explored for years. Algorithms that analyze large-scale metabolic network have been published a lot. Among all the available algorithms, flux balance analysis (FBA) is proved to be an effective approach to give quantitative prediction of genome-scale biological networks and used in most of the analysis. In this review, we summarized the recent advances of FBA, including typical FBA and extended FBA. Then stand-alone software and on-line tools that apply FBA to mathematically modeling large microbial networks are introduced. The advantages as well as weaknesses are further compared for better use of these tools. The problems and perspectives of the algorithm and software used in the metabolic network analysis are also discussed for further development.
2013 Vol. 30 (3): 71-79 [
Abstract
] (
3492
) [
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1KB] [
PDF
1668KB] (
1586
)
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