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2008 Vol.25 Issue.5,
Published 2008-09-15
Article
Article
374
2008 Vol. 25 (5): 374-374 [
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377
Expansion Character and Liquid Axial Dispersion in Expanded Bed with Particles of Macro-Porous Resin
WANG Bang-chen,LIU Ming-yan
Using AB-8 resin as solid phase,the expansion character and liquid mixing performance in the expanded bed were studied.The expansion character of AB-8 resin in a 50 mm column was found to obey the Richardson-Zaki equation.At a fixed expand ratio,the axial voidage of the bed increased with the increase of bed height,with heterohomogeneous distribution.At a fixed bed height,the liquid axial dispersion coefficient increased with the increase of liquid superficial velocity.Liquid axial dispersion coefficient is 0.5×10~(-5)—(5×10~(-5) m~2/s.)
2008 Vol. 25 (5): 377-381 [
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1795
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2323
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382
Coupling Process of 1,4-Butanediol Dehydrogenation and Maleic Anhydride Hydrogenation over Cu-Zn-Al Catalyst
ZHAO Xiao-jing,LIU Zong-zhang,JIANG Hao-xi,ZHANG Min-hua
The catalyst of Cu-Zn-Al composite oxide system was prepared by co-precipitation.XRD and TPR were used to characterize the catalyst,the influence of catalyst composition,such as Al content,Cu/Zn ratio,on catalytic performance for the coupling process was analyzed,and the optimal composition was obtained.The experiment showed that the catalyst with 20% Al and n(Cu/Zn)=0.5—2.0 have good catalytic performances.The CuO species and its occupation on the catalyst surface were the determining factors for the catalyst activity.Results of XRD,TPR and BET showed that n(Cu/Zn) is responsible for the dispersion of CuO and the surface area of catalyst.The suitable n(Cu/Zn) can improve the selectivity of catalysts.
2008 Vol. 25 (5): 382-385 [
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1948
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2755
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386
Structure and Performance of Pre-Sulfurized Catalyst LaCoO_3
QIN Xin-chao,MA Zhi,HE Xin-yan
The catalytic activities of perovskite LaCoO_3 and that after pre-sulfurized in the reduction of SO_2 by CO were analyzed.It was found that the pre-sulfurized catalyst LaCoO_3 can observably decrease the starting reaction temperature and the complete conversion temperature.The sulfurization process of perovskite LaCoO_3 was discussed by XRD.The phase transformation of catalysts was investigated.The results showed that the catalysts were the mixture of La_2O_2S,CoS_2,La_2(SO_4)_3 and La_2O_3.
2008 Vol. 25 (5): 386-388 [
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2454
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389
High Solid Content and Low Viscosity Polymer Polyols by Two-Reactor Continuous Process
LIU Yong,L Shi-jun,GUO Rui-wei
High solid content polymer polyols were synthesized by two-reactor continuous process,and various operation conditions were studied.In this study,POP with 45% solid content and(4 900) mPa·s(25 ℃) viscosity was synthesized by tworeactor continuous process under the most optimized condition.The distribution of diameters of dispersion particles were studied by dynamic light scattering and SEM.The results showed that the broader distribution of diameters was gained by two-reactor continuous process than by batch process,and the mean diameter was higher than that of one-reactor,so the viscosity of POP by two-reactor continuous process was lower.
2008 Vol. 25 (5): 389-393 [
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1809
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394
Extraction of Resveratrol from Giant knotweed with Enzymolysis-Microwave
LAN Tian-lu,ZHU Hong-ji,LI Shao-bai
To improve the extracting ratio of resveratrol from giant knotweed,a new process was developed in this paper by using cellulose and microwave.The optimum conditions of enzyme extraction and microwave extraction were obtained through orthogonal test.For the enzyme extraction,with the ratio of enzyme/giant knotweed 1∶500 at 50 ℃ for 90 min,the yield of resveratrol is two times more than that extracted by ethanol.For the microwave extraction with the ethanol content of 80%,the liquid ratio of 1∶20,extracting by microwave for 60 s at 510 W,the yield of resveratrol is three times more than that extracted by ethanol.For the enzyme-microwave extraction,the yield of resveratrol is three times more than that extracted by ethanol with enzymation 30 min by microwave for 10 s at 510 W.So the enzyme-microwave extraction can shorten the extraction time and lower the cost of production,it is an effective way to extract resveratrol from giant knotweed.
2008 Vol. 25 (5): 394-398 [
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2044
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399
Photocatalytic Degradation of NO_x Under Visible Light Irradiation Using Fe Doped Titanium Dioxide
ZHOU Lin~
In order to utilize visible light in photocatalytic conversion of NO_x, Fe atoms were doped in commercially available photocatalytic TiO_2 powders by impregnating method.The crystal phase of TiO_2 was not changed after calcinations process.Analysis by both X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) indicated that Fe atoms were incorporated in TiO_2 as Ti—O—Fe linkages.A significant shift of the absorption edge to a lower energy and a higher absorption in the visible light region were observed.These Fe-doped TiO_2 powders exhibited photocatalytic activity for the degradation of NO_x under visible light irradiation.The sample mixed with 0.2% Fe~(3+) and calcined at 600 ℃ for 1.0 h showed the best photocatalytic activity.
2008 Vol. 25 (5): 399-403 [
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3375
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2449
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404
Application of Immobilized Cholesterol Column Chromatography in Protein Refolding
LI Jin,BAI Shu
Cholesterol modified Sepharose matrix was prepared by a two-step method with cyanuric chloride as a linker.A refolding chromatography with immobilized cholesterol was studied for the reactivation of denatured-reduced lysozyme and the optimal method for protein refolding was established.Furthermore,the effects of flow rate,initial protein concentration and loading mass on refolding efficiency were investigated.The results showed that when the loading mass of Lysozyme was 0.25 mg/mL of the support,96.3% protein recovery and 91.4% activity yield were obtained by adsorption-elution way at flow rate of 0.02 mL/min.Denatured-reduced lysozyme was effectively refolded into the active form.
2008 Vol. 25 (5): 404-408 [
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1603
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409
Effects of Operation Processes on the Pervaporation Performance of New PVA/PA Composite Membrane
ZHANG Pei-qin,CAI Bang-xiao
The effects of concentration of the isopropanol(IPA) in the feed and the operation condition on pervaporation(PV) separation performance of the polyvinyl alcohol and polyamide(PVA/PA) composite membrane were emphatically investigated. The forecast equations of the total permeating flux(J) of water and isopropanol were also established by the regression of experimental data.It was shown that the IPA concentration in the permeates [w′(H_2O)] gained in the full concentration of the feed or at the operation temperature of 25 ℃—100 ℃ was always less than 1.0%(weight ratio).The permeating flux increased with the decrease of the feed concentration or the increase of the operation temperature.The data from forecast equations were consistent with the test results in PV separation.The separation performances of the composite membrane operated for 90 d or stored for 120 d at ambient temperature showed stable separating characteristic.The permeating flux was 73.10 g/m~2·h,the water concentration in the permeate [w′(H_2O)] was more than 99.5% weight ratio when the PVA/PA composite membrane was used to separate azeotropic mixture of IPA/water at 80.4 ℃.The PVA/PA composite membrane will possess good application perspective in the food,biological pharmaceutical and chemical engineering industreis.
2008 Vol. 25 (5): 409-413 [
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414
Study on Nonionic Wax Emulsion
GUO Ze-jun,LI Hui-peng,SHEN Jian,QI Yu-tai
Span-80,Tween-80 and stearic acid were used as emulsifier for 52~# wax complex.The factors,such as HLB,the quantity of emulsifier,emulsifying temperature,emulsifying time,and emulsifying water,on the quality of the wax emulsion were discussed.The optimum emulsifying conditions were obtained.The results showed that stable wax emulsion can be prepared when HLB is 10.385,the quantity of emulsifier is 9.80% by gross,emulsifying temperature is 75 ℃,emulsifying time is 55 min,emulsifying water is 71.11%.
2008 Vol. 25 (5): 414-418 [
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2081
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419
Synthesis of 2-Phenylbenzimidazole Catalyzed by the Prepared Aminosulfamic Acid
YU Chao-sheng,LIN Wei,ZHENG Xiao-feng,LI De-jun,ZHENG Chuan-zhi,XIE Jin,LI Bin
2-phenylbenzimidazole was prepared by reaction of o-phenylenediamine and benzaldehyde in anhydrous ethanol,catalyzed by the prepared aminosulfamic acid.The product was characterized by UV-visible spectroscopy,Fourier transform infrared spectroscopy and(()~1HNMR). The effects of catalyst dosage,reactant ratio,reaction temperature,reaction time on the yield of product were investigated.The optimal condition is that the highest yield of 2-phenylbenzimidazole is 71.8% when the reaction is carricd out with ratio of amminosulfamic acid mass to o-phenylenediamine mole of 4.0 g/mol,the ratio of o-phenylenediamine to benzaldehyde of 2.5,at(85 ℃) for 3.0 h.
2008 Vol. 25 (5): 419-423 [
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1923
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424
Recovery of Dilute Acetic Acid by Solvent Extraction Together with Azeotropic Distillation
BAI Peng,LU Chun-hong,TIAN Ye,YU Li-ming
In order to recover acetic acid with a high purity from dilute solution in some chemical processes,firstly the solution was concentrated by benzene/ethyl acetate mixed solvent;then some water and extractant in the system were removed by normal distillation;and at last azeotropic distillation was utilized to separate acetic acid using butyl acetate as entrainer.The purity of acetic acid can be up to 96.84%,and recovery percentage is 84.97%.The experiment could offer some guidelines to the industry.
2008 Vol. 25 (5): 424-427 [
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2073
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2597
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428
Mixing Performance of Cross Flow in Turbine Ejecting Mixer
LI Ben-xiang,DONG Xin-rong
The mixing performance of cross flow was studied in turbine ejecting mixer with tracing technique.The flow parameters such as the adhesion-wall effect of jet,penetration proportionlity of jet,momentum ratio,Reynold's number and incorporation time,which affect the mixing quality were analysed.The results showed that turbine ejecting mixer was a rapid mixing apparatus with good mixing process of little mixing space,good mixing uniformity and high volume ratio of medium and anticratering spray nozzle.
2008 Vol. 25 (5): 428-431 [
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4385
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2168
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432
PEMFC Numerical Simulation Based on COMSOL Multiphysics
HAO Jian-xin,GAO Xian-wen,GAO He-ming
For the high-speed reaction in a fuel cell,some data are immeasurable when the cell is in function.In order to get a better understanding of the complex internal flow structure,the transmission of chemical composition,optimize water and thermal management,and to shorten the design and optimization cycle for a fuel cell,a mathematic model and numerical simulation are needed.Based on COMSOL Multiphysics 3.3a,a two-dimension cell model was built and numerical simulation was conducted on the electric current density,gas velocity,gas pressure and moisture of a fuel cell.In the simulation process,the maximum electric current density is(9 027 A/m~2) and the maximum flow velocity is 0.7 m/s.
2008 Vol. 25 (5): 432-437 [
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438
Operation and Simulation of Using Tank to Exchange Liquid Phase in Cascaded Columns
TIAN Ye,BAI Peng,YU Li-ming,LU Chun-hong
An operation mode using tank to exchange liquid phase in cascaded columns was proposed.This method can be used to separate heat-sensitive materials as well as mixtures which have a low relative volatility.Ethanol-isopropanol system was studied in this article.The results of this experiment proved the feasibility of this method.A mathematical model was also performed and used to simulate the process.The relatively good agreement between experimental and simulation data shows the present model can represent the process of this operation mode accurately.
2008 Vol. 25 (5): 438-442 [
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4555
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443
New Progress and Prospect in Research of MoVTeNbO Catalyst
REN He,DONG Qun,WANG Jian
The recent researches on the reaction mechanism of making the selective oxidation of propane to acrylic acid by molecular oxygen and the new progress of researches on multiplex matallic oxide catalysis MoVTeNbO were reviewed.Some progressive methods to prepare MoVTeNbO catalyst were essentially introduced.The influence of the variation of composition and the composition of activate phase in catalyst preparation on catalyst performance were put forward,and trend of developments were prospected.
2008 Vol. 25 (5): 443-447 [
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3479
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448
Progress in Heterogeneous Catalysts in Chemoenzymatic Dynamic Kinetic Resolution Processes
LI Shui-bao,XUE Ping
The chemoenzymatic dynamic kinetic resolution(DKR) of racemates is one of the efficient ways in the preparation of single chiral compounds.The recent research progress in two kinds of heterogeneous catalyst,immobilized lipases and solid racemization catalysts which were used in chemoenzymatic dynamic kinetic resolution processes were reviewed.The catalytic effects of solid racemization catalysts such as transition metal complex,acidic β-zeolite,acidic resin compatible with the immobilized lipases using in this process were introduced.
2008 Vol. 25 (5): 448-454 [
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2055
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3078
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455
Development on Synthesis of 2-t-butyl-p-cresol
WU Bing~1,SHEN Jian~1,FENG Jian~2
2-t-butyl-p-cresol,a kind of organic intermediate,was used as antioxidant.Amount of researches were developed for the increasing demand of 2-t-butyl-p-cresol.The development on the synthesis of 2-t-butylp-cresol and catalyst were reported.
2008 Vol. 25 (5): 455-458 [
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1702
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459
Development on Biomass Pyrolysis Technology
LIU Kang,JIA Qing-zhu,WANG Chang
Biomass is the most abundant renewable resource in the world.Using the biomass-pyrolysis technique,which is a new type of biomass-energy utilization,the low energy density in biomass could be converted into the products with high energy density,and many chemicals would be obtained also.The recent progress in biomass-pyrolysis techology at home and abroad,the pyrolysis mechanism of the main element of biomass were investigated,respectively.Furthermore,the problems to be solved in pyrolysis and the research direction in these respects were proposed also.
2008 Vol. 25 (5): 459-464 [
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2103
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465
Reasons for Hindering an Industrial Application of Supercritical Water Oxidation(SCWO) and Possible Solutions
QIAN Sheng-hua,ZHANG Min-hua,DONG Xiu-qin,JIANG Hao-xi
Supercritical water oxidation(SCWO) is a green and high effective technique for treatment of organic wastes that are noxious or difficult to be decomposed.Although it has many outstanding advantages,it has some severe disadvantages which have hindered an industrial application of the process.In this paper,these disadvantages were reviewed and some possible solutions were discussed.
2008 Vol. 25 (5): 465-470 [
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2949
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3152
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470
2008 Vol. 25 (5): 470-470 [
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1458
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1411
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471
2008 Vol. 25 (5): 471-471 [
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1264
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