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Current Issue
2013 Vol.30 Issue.6,
Published 2013-11-15
Article
Article
1
Defect Healing of MFI Zeolite Membranes
YANG Jun, LIU Xiu-Feng
Defect-Free MFI zeolite films on
α
-Al
2
O
3
were fabricated by secondary growth method. The membrane generated large defect during calcination leading to low CO
2
/N
2
separation selectivity. We used nanosized SiO
2
to heal the defect of original membrane. After healing process, the separation factor of CO
2
/N
2
could be enhanced to ca.5.0 while it was about 1.6 for the original membrane. The membrane showed high stability after healing. In addition, the method is convenient and feasible to repair defects of membrane with high reproduction.
2013 Vol. 30 (6): 1-4 [
Abstract
] (
1502
) [
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1KB] [
PDF
1481KB] (
1641
)
5
Preparation and Characterization of PVDF-TiO
2
Composite Hollow Fiber Membrane
GUO Chun-Gang1, 吕Jing-Lie1 , 2 , ZHANG Zhao-Cai1, LI Xue-Mei1, LI Hao1, LI Xiao-Ming1
Blending modification of PVDF membrane is the most efficient way which can be applied to an industrial scale production. The incorporation of inorganic nanoparticles has been extensively studied due to its simplicity. Poly(vinylidene fluoride) (PVDF)-titania (TiO
2)
composite hollow fiber membranes were prepared by phase inversion process. The microstructure, crystalline phase, uniformity, thermal stability, mechanical strength, hydrophilicity, ultrafiltration performance and antifouling ability of the membranes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersion of X-ray (EDX), thermo gravimetric analysis (TGA), mechanical property test, contact angle measurement and ultrafiltration (UF) experiment, respectively. Compared to the pure PVDF membrane, the performances of composite membranes were improved greatly. When the mass fraction of TiO
2
was 2% (by weight of PVDF), pure water flux increased from 348 L/(m
2
·h) of the PVDF membrane to 377 L/(m
2
·h)，rejection of bovine serum albumin (BSA) increased from 68% to 90%. Moreover, mechanical property, hydrophilicity and antifouling property were enhanced effectively.
2013 Vol. 30 (6): 5-10 [
Abstract
] (
1437
) [
HTML
1KB] [
PDF
1819KB] (
1689
)
11
Use of Ionic Liquid in Asymmetric Hydrogenation of Acetophenone
DING Fei, LOU Lan-Lan, YU Kai, LI Jie, LIU Shuang-Xi
Asymmetric hydrogenation of prochiral ketones by transition metal complexes is one of the most effective methods for the synthesis of enantiomerically pure secondary alcohols, and is of great importance in the fields of pharmaceuticals, fine chemicals and advanced materials. In this paper, the chiral Ru complex containing achiral monophosphine ligand and chiral diamine ligand is synthesized and immobilized in ionic liquids. The resulting catalytic system is evaluated in the asymmetric hydrogenation of acetophenone. The effects of various reaction conditions including reaction temperature, hydrogen pressure, solvent, amount of ionic liquids, on the catalytic activity are studied in detail. The results show that the chiral catalyst can be effectively immobilized in ionic liquids, and low Ru leaching is found. The chiral catalyst can be separated simply by extraction.
2013 Vol. 30 (6): 11-14 [
Abstract
] (
3223
) [
HTML
1KB] [
PDF
1074KB] (
1849
)
15
C-H Bond Activation of Bisimines by Palladium (II) and Platinum (II). Synthesis, Characterization of Bis(imino)arylpalladium (II) Pincer Complexes and Their Application in Carbon-Carbon Cross Coupling Reactions
CHEN Rong, CHEN Ying, LIU Fang, LI Ping, HU Zhao-xia, WANG Hong-xing
The reactions of a variety of 4,6-dimethyl-1,3-bis(imino)benzenes 2a-g derived from 4, 6-dimethylisophthalaldehyde and anilines or benzylamine with palladium (II) acetate in anhydrous acetic acid under nitrogen were investigated. Experiment results demonstrate that cyclopalladations in such condition are applicable not only to the present system under study but also to the 5-substituted bis(imino)benzenes 6, 7. The molecular structure of 3b was further confirmed by X-Ray single-crystal diffraction. 3b Crystallizes in orthorhombic, space group
P
2(1)2(1)2(1) with
a
=0.734 53(8),
b
=1.683 8(3),
c
=1.691 7(2) nm,
α
=
β
=
γ
=90°. Treatment of 2b with K
2
PtCl
4
in anhydrous acetic acid affords the corresponding NCN-platinum pincer. Carbon-carbon cross coupling reactions catalyzed with 3b were investigated. These palladium complexes have been proved to be high effective catalysts for Suzuki coupling reaction.
2013 Vol. 30 (6): 15-26 [
Abstract
] (
1600
) [
HTML
1KB] [
PDF
1943KB] (
1562
)
27
Isobaric VaporLiquid Equilibrium for MethanolMethyl Acetate-1-butyl-3-methylimidazolium bis［(trifluoromethyl)sulfonyl］imide at 101.3 kPa
PENG Yan-Mei, CUI Xian-Bao, ZHANG Ying, FENG Tian-Yang, XUE Le-Xing, TIAN Zheng
Vapor-liquid equilibrium (VLE) data for methanol-methyl acetate-1-butyl-3-methylimidazolium bis［(trifluoromethyl)sulfonyl］ imide (［BMIM］［Tf
2
N］) at 101.3 kPa were measured. The experimental VLE data were correlated by nonrandom two liquid (NRTL) activity coefficient model, and the binary parameters were obtained. The results show that the ionic liquid ［BMIM］［Tf
2
N］ produces a notable salting-out effect, which enhances the relative volatility of methanol to methyl acetate, and relative volatility of methanol to methyl acetate increase with the concentration of ［BMIM］［Tf
2
N］ in the system. The effects of ［BMIM］［Tf
2
N］ and 1-octyl-3-methylimidazolium hexaflurophosphate (［OMIM］［PF
6
］) were compared, and the results indicated that ［BMIM］［Tf
2
N］ was more effective for the separation of methanol-methyl acetate system.
2013 Vol. 30 (6): 27-31 [
Abstract
] (
2342
) [
HTML
1KB] [
PDF
1333KB] (
1786
)
32
Extracting Acetic Acid from Bio-Oil Using TOA
LYU Dong-Can , LIU Yun-Quan, WANG Duo
Complexation extraction with trioctylamine (TOA) as solvent for the recovery of acetic acid from bio-oil was studied. The effects of TOA concentration, iso-octyl alcohol concentration, volume ratio of extractant/distillate and temperature on extraction efficiency were examined. Experimental results indicated that the extraction efficiency was the highest with 40% TOA+40% iso-octyl alcohol+20% kerosene and 3∶1 volume ratio of extractant/distillate at the temperature of 0 ℃. And an extraction efficiency of 74.6% for acetic acid was achieved in a single-equilibrium-stage extraction under this optimal condition.
2013 Vol. 30 (6): 32-36 [
Abstract
] (
1559
) [
HTML
1KB] [
PDF
1324KB] (
1709
)
37
Progress in Technology of Reactive Dividing-Wall Column
ZHU Huai-Gong1, ZHANG Rong-Pu2, MA He-Xu1, QI Xiang-Juan1, ZUO Shao-Qing1, WANG Yan1
As a combination of the dividing-wall column (DWC) and conventional reactive-distillation column, the reactive dividing-wall column (RDWC ) is a highly coupled and complex technology, in which the reaction and separation can occur at the same time. The characters of RDWC are introduced, and especially its applications abroad as well as the optimization and controllability are reviewed. In addition, the developing situation in China is overviewed. Finally it can be proposed that the technology will have great development prospect and more applicable value in energy saving and emission reduction.
2013 Vol. 30 (6): 37-42 [
Abstract
] (
1728
) [
HTML
1KB] [
PDF
1471KB] (
2492
)
43
Coagulation Properties and Effect of Bathing Seawater
WANG Wen-Hua, ZHANG Xiao-Qing, QIU Jin-Quan, WANG Jing, ZHANG Yu-Shan
The coagulation properties of bathing seawater were investigated by using iPDA (intelligent Particle Dispersion Analyzers) and Turbiscan Stability Analyzers. The orthogonal test was designed to optimize the coagulation conditions, and removal efficiencies of the main pollutants in bathing seawater were also discussed. By comparison, the coagulation effect of aluminum sulfate (AS) was better than other inorganic flocculants. The size and the setting property of the formed flocs were affected by flocculant dosage. The removal rates for pollutants of bathing seawater increased by combining aluminum sulfate and cationic polyacrylamide. The optimum coagulation conditions were obtained: the dosages of 50 mg/L and 0.5 mg/L for AS and PAM, 250 r/min for 2.5 min, 60 r/min for 20 min and setting time for 25 min. The removal rates of turbidity, LAS and COD
Cr
were 93.13%, 74.64% and 42.92% respectively.
2013 Vol. 30 (6): 43-48 [
Abstract
] (
2216
) [
HTML
1KB] [
PDF
1616KB] (
1571
)
49
Review of Bubble Coalescence at Aqua Solution
YAN Xue-Fei, WANG Gui-Jun, WANG Yong, JIN Liang-An
Bubble-coalescence at aqua solution is an important content of chemical hydrodynamics and exists at a lot of fields such as chemical engineering, ocean, military defend and plays an important role. So, it is very worthy to study its mechanism and the factor in theory and application. According to the study about bubble-coalescence at home and abroad, in this paper the mechanism at the statics and complex flows and the factor such as weber-number(
WE
), liquid viscosity, surfactants were summarized, the shortage of the research was discussed, and a primary expectation for the bubble-coalescence’s future study was proposed.
2013 Vol. 30 (6): 49-55 [
Abstract
] (
1932
) [
HTML
1KB] [
PDF
1507KB] (
1920
)
56
Preparation and Electrochemical DoubleLayer Capacitor Application
CHEN Ming-Yan
Porous carbon microspheres with a high
S
BET
surface area have been prepared selected porous starch as precursor. The synthetic process composed of ammonium secondary phosphate catalyzed stabilization, carbonization and KOH activation at different mass ratios of KOH/C. The morphologies and pore textures of the resultant nano-carbon microspheres have been measured by SEM, HRTEM and N
2
sorption tests. The results shown that the carbon microspheres have a high surface area more than 2300 m
2
/g contained a large amount of macro- and micropores. Furthermore, these carbon microspheres existed excellent electrochemical performances in a symmetric electrochemical double-layer capacitor with 6 M KOH as electrolyte and a high specific capacitance of 248 F/g was maintained even at a high current density of 100 A/g.
2013 Vol. 30 (6): 56-61 [
Abstract
] (
2059
) [
HTML
1KB] [
PDF
1800KB] (
2093
)
62
Dynamics Simulation of the Stability of Capsomere
BAI Shu, TANG Rong-Hong, ZHANG Lin
Virus-like particles (VLP) is a selfassembly of capsomere (Cap) with great potential in vaccinology, gene therapy, drug delivery, and materials science. The stability of Cap is crucial for its selfassembly to VLP. In the present study, the allatom molecular dynamics (MD) simulations are performed to investigate the effect of solution conditions on the stabilization of Cap. The conformational transition has been investigated. The structure of solvent is also examined to explore the molecular mechanism of the regulation on the stabilization of Cap by solution conditions. In both stabilization buffer and aqueous solution, Na
+
can be attracted and accumulated around protein through electrostatic interaction, and forms a shell with water molecules. This is very important for the stabilization of Cap. Moreover, in stabilization buffer, the shell formed by accumulated Na
+
around the protein can induce the formation of a shell of Cl
-
. The multishell structure causes more hydrogen bonds within Cap and consequently provides better stabilization of Cap. These results provide molecular insights into the effect of solution condition on the stabilization of Cap, which would be beneficial for the regulation of VLP selfassembly.
2013 Vol. 30 (6): 62-66 [
Abstract
] (
1870
) [
HTML
1KB] [
PDF
1806KB] (
1749
)
67
Laser-Induced Mutation of Biodesulfurization Strain
Gordonia
sp. WQ-01 and Cloning Expression of Monooxygenase Gene (DszC) in Escherichia coli
WAN Tao, HUANG Di, WEN Jian-Ping, WANG Hui-Fang, LIU Lin, ZHANG Shuang
Laser-induced mutation was used to get a mutant of biodesulfurization strain
Gordonia
sp. WQ-01，and the various irradiation time and output power was investigated. Based on the DszC enzyme activity, nucleotide sequence alignment, structure analysis and heterologous expression in
Escherichia coli
, the relevant desulfurization characteristic was revealed. The results showed that a highefficient desulfurization strain with the efficiency of 0.15 mmol·L
-1
·h
-1
and a reduced desulfurization time (36 h) was achieved under the optimal irradiation condition, which was 15 min and 20.0 mW. Compared with the parent strain, the key enzyme DszC was improved by 33.3%. The nucleotide and amino acid sequence, second and third structure were changed for
dszC
in the mutant strain, thus resulted in an increase of enzyme activity. The
E. coli
BL21(DE3) expressing the
dszC
produced a protein with 45 kDa with IPTG induction.
2013 Vol. 30 (6): 67-73 [
Abstract
] (
3664
) [
HTML
1KB] [
PDF
1904KB] (
1602
)
74
Application of External Metabolites Simulation in Metabolic Engineering
GENG Zhao-Hui1, 2 , 4 , HAO Tong1, 2 , 4 , MA Hong-Wu3, 4
The external metabolites that can be transferred to/from the cell can greatly affect the analysis results. In this paper, the genome-scale metabolic networks of
E. coli
and
B. subtilis
as examples were used to simulate the metabolic states at various conditions where different transport reactions for external metabolites were knocked out. The result showed the preference of different metabolic byproducts were related with their energy states, thus providing some guidance on engineering a strain to improve the production of different metabolic products.
2013 Vol. 30 (6): 74-79 [
Abstract
] (
1728
) [
HTML
1KB] [
PDF
1548KB] (
1827
)
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