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Current Issue
2002 Vol.19 Issue.1,
Published 2002-01-15
Article
Article
1
Effect of Scale Inhibitor-Dispersant on the Crystallization of Potassium(Sodium)Fluosilicate
YANG Lin-jun 1,ZHANG Yun-xiang 1,HUANG Yin-hua 2
The effects of 3 types of effective scale inhibitor-dispersant on the crystallization of Na 2SiF 6 and K 2SiF 6 from phosphoric acid solution are studied in a continuous MSMPR crystallizer. The results indicate that the selected scale inhibitor-dispersant can reduce the crystal growth rate and average size. At the same time can increase the population density of nuclei and nucleation rate of potassium(sodium)fluosilicate. Moreover, the crystal habit are highly modified:Na 2SiF 6 forms grain-shaped and other irregular crystals instead of hexagonal crystals, and K 2SiF 6 forms grain-shaped and small cubic crystals instead of cluster aggregated by cubic crystals.
2002 Vol. 19 (1): 1-5 [
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Study on Culture Technological Conditions of Klebsiella Pneumoniae
FANG Wen 1,WU Lei 1,GE Xin 2,ZHANG Ying 1,GAN Yi-ru 1
The cultivation of Klebsiella pneumoniae in flask was studied. The medium recipe suitable to Kp-9 strain growth and expression of the capsular glycoprotein was proposed. The ingredients of the recipe include glucose 1%, soya peptone 1.5%, beef extract 0.2%, yeast extract 0.2%,tryptone 0.5%,NaCl 0.5, K 2HPO 4 0.35% and KH 2PO 4 0.15%. The suitable culture conditions are 160r/min of rotate speed, 20% of filling capacity and 2% of inoculum volume.
2002 Vol. 19 (1): 6-11 [
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1909
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12
Study on Properties of the New Type Coagulant Polymeric Ferric Silicate——Sulfate Containing Boron
LIU Xiao-jun 1,TIAN Yi-ling 2,MA Xiao-ou 3,KANG Si-qi 3,YU Zun-hong 1
A new type of coagulant polymeric ferric silicate-sulfate containing boron(PFSSB)is prepared in this paper. Effects of B, Fe contents on this coagulant properties are investigated. The coagulating characteristics and mechanism are also discussed. The results show that under the preparation conditions of n (B)/ n (Si)(molar ratio)=0.16, n (Fe)/ n (Si)(molar ratio)=0.50,PFSSB has optimal coagulating properties and stability. In comparison with PFS, PFSS, PFSSB is superior in suitable pH range, sedimentation and suitability. It proves to be a kind of excellent and useful coagulant. These excellent properties result from the attributions of iron ion, polysilicic acid, B and SO 2- 4 together.
2002 Vol. 19 (1): 12-15 [
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16
Study on the Synthesis of p-Ethyl-Styrene(Ⅰ) ——Friedel-Crafts Acylation of Ethylbenzene
XU Yong-shen,ZHU Hai-jin,ZHU Li-ping
p -ethyl-styrene was synthesised from ethylbenzene by several steps of Friedel-Crafts acylation,reduction and dehydration.Among which acylation is the more important.The reaction process of acylation was monitored by Gas-chromatography.The effects of solvents,reactants ratio and temperature on the yield and selectivity were determined.Optimization of parameters was got out.The products were identified by methods of IR and 1HNMR.
2002 Vol. 19 (1): 16-21 [
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22
Expression and Purification of 10BNP Engineering Bacteria
LIU Rong,ZHANG Ying,WU Lei,CAI You-qing
Expression of recombinant 10BNP in E.coli was studied in shake flasks and the optimum induction time is 4h.The expression level was over 21 8%.10BNP fusion protein which was produced as inclusion body (IB) was separated by breaking bacteria through sonication.IB was properly dissolved in the presence of 8M Urea.By means of Immobilized metal ion affinity chromatograph(IMAC),comparing the results of different elution methods,a optimum purification route was attained.The work facilitates the further research.
2002 Vol. 19 (1): 22-25 [
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26
Purification of E-44 Epoxy Resin Solution
YU Wen-dong,DUAN Wu-hua,ZHANG Cheng-qun,ZHOU Xiu-zhu,ZHOU Jia-zhen
Both the density and the viscosity of E-44 epoxy resin solution are measured at different temperature.The effect of the volume ratio of E-44 epoxy resin to benzene on phase entrainment is investigated with φ 50mm centrifugal extraactor.The relation between operating factors(rotor speed the flow rate and the flow ratio)and the purifying effect is studied with φ 50mm centrifugal extractor too.The plant test is carried out with φ 230mm centrifugal extrator.When benzene was added into E-44 epoxy resin,the content of chlorine in the E-44 epoxy resin is less than 5mg/L after purification.Without adding bezene,the content of chlorine in the E-44 epoxy resin is less than 100mg/L after purification.
2002 Vol. 19 (1): 26-31 [
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32
Study on Modification of Hydrophobic Polysulfone Membrane
SONG Yan-qiu, YUAN Xu-bo, SHENG Jing
The general method modifying hydrophobic polysulfone to produce highly hydrophilic surfaces was developed. This method is the blend technique. We used scanning electronic microscopy to examine the phase behavior of A-B diblock copolymer of poly(ortho esters)-b-poly(ethylene glycol). Because PEG has high surface energies in copolymer, PSF membranes were modified and improved the surface hydrophilicity and hemocompatibility.
2002 Vol. 19 (1): 32-35 [
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36
Preparation and Applications of Surfactant-Coated Enzymes
XING Ai-hua,SONG Bao-dong,WU Jin-chuan,WANG Shi-chang
This paper reports the method of coating enzymes with surfactants to improve their activity and stability when used in organic solvents.The synthesis of surfactant and preparation of the surfactant-coated enzymes are introduced.The effects of surfactant types,enzyme origins,organic solvents,temperature,pH and water content in the system on enzyme activity are reviewed and the directions for further study are discussed.
2002 Vol. 19 (1): 36-42 [
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43
Advances of Cold Plasma Reaction Technology in Methanol Formation
LI Ming-wei,JIANG Tao,LIU Chang-jun,XU GEN-hui
This paper has briefly introduced the characteristics of cold plasma and reviewed the present status of research in methanol formation by cold plasma reaction through methane partial oxidation,hydrogenation of carbon dioxide and so on.The energy consume of cold plasma reaction was analyzed.In the end of this review,further investigations were proposed.
2002 Vol. 19 (1): 43-49 [
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50
Expounding of approaches to Vapor Pressure Correlation and Estimation
YI Shou-zhi\+1,WANG Jia-ning\+2,MA Pei-sheng\+2
A review of several approaches to vapor pressure correlation and estimation is given herein.It includes methods such as corresponding state,reference substances,group contributions,as well as the latest corresponding states group contribution(CSGC).At the same time,the advantages and disadvantages of these means are discussed.
2002 Vol. 19 (1): 50-54 [
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55
Application of Holographic Interferometry in the Measurement of Liquid Diffusivities
MA You-guang,LIANG Jun-ai,HE Ming-xia,YU Guo-cong
Liquid diffusivities are the important paramenters in the study of mass transfer in gas-liquid,liquid-liquid and solid-liquid systems.Due to the imperfection of the theoretical prediction and empirical evaluation,the experimental methods have been paid considerable attention by the researchers in this field.Laser holographic interferometry is a new method in the modern optical measurement.This article introduces the application and progresses of holographic interferometry to the measurement of liquid diffusivities.
2002 Vol. 19 (1): 55-58 [
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59
Research Actualities of Preparing Carbon Nanotubes
CUI Shen, LI Hai-yan
Carbon nanotubes (CNTs) are being noticed more and more by scientists and entrepreneurs because of their novel physical and chemical properties and prospects of application. In this paper, the structure, properties and application of carbon nanotubes are summarized shortly. Some methods of characterization of CNTs are introduced. Relatively detailed review is given on the preparation of CNTs.
2002 Vol. 19 (1): 59-64 [
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1800
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65
Applications of Plasmas in Catalytic Reaction
LI Yang 1, XU Gen-hui 1, LIU Chang-jun 1, ELIASSON Baldur 2
The application of plasma technology in the preparation,regeneration and treatment of catalysts was reviewed. The chemical utilization of some stable moleculesd, such as methane and carbon dioxide, was also discussed in the presence of plasmas.
2002 Vol. 19 (1): 65-70 [
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1861
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71
The Inverse Emulsion of Copolymerization of Acrylamide
LIN Tong,LU Shao-Jie
This paper is a short review of free-radical synthesis of polyacrylamide and copolymers. Its developments in technology in recent years were summarized and the influence of synthesis and technological factors on the structure and properties of polyacrylamides was discussed. Especially concerning the inverse emulsion polymerization of acrylamide was expounded in detail.
2002 Vol. 19 (1): 71-75 [
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76
The Physicochemical Properties and Characterization of Carbon Black
WANG Dao-hong, XU Yi-fei, ZHANG Ji-yan
Carbon black is special kind of carbonaceous material on microstructure, particle configuration and surface behavior. The coacervate particle of carbon black consists of lied graphite layers. Hydrogen, oxygen and sulfur on the surface of carbon black form surface functional groups and control chemical properties in carbon black.The progress of instrumental analysis technology affords effective methods for study on the surface properties of carbon and discovers more and more information of surface configuration on carbon black.
2002 Vol. 19 (1): 76-82 [
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1742
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83
Progress in Selecting of the Solvents for Extractive Distillation
SONG Hai-hua, SUN Wei, WANG Xiu-li, WANG Ming-tao
In this paper, the main approaches of selecting the solvents for extractive distillation are described, which can fall into two categories:1) the property-limit approaches including the experimental measurement,the experience-screening method and the activity coefficients algorithm, and 2) the computer-aided optimization approaches including the molecular design method and the artifficial neural networks technique. Their characteristics and scopes of applications are also discussed in detail.
2002 Vol. 19 (1): 83-88 [
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1946
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89
Progress in Research of Cooling Crystallization of Vitamin C
WANG Sheng-chun\+1,YIN Qiu-xiang\+1,WANG Jing-kang\+1, ZHANG Xiao-feng\+1,WANG Li-qun\+2
The paper introduces the results of the analysis of crystal structure,the determination of crystallization thermodynamic and kinetic data and the development of the cooling crystallization technology of vitamin C.Research progress in the simulation and control of cooling crystallization of vitamin C is also presented.
2002 Vol. 19 (1): 89-95 [
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1926
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96
Application of Activated Carbon Using in Desulfurization of Flue Gas
HE Chun-hong,ZHENG Jia-ming,RUAN Xiang-quan
The paper generally illustrates three different methods of desulfurization using activated carbon mateiral.The paper also introduces several factors affecting the DeSO\- x activity of activated carbon mateiral which include surface structure,oxygen groups,nitrogen groups and metal oxide loaded on the surface.
2002 Vol. 19 (1): 96-100 [
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1831
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101
Advances in Reactive Distillation
LIU Jin-song,BAI Peng,ZHU Si-qiang,YANG Zhi-cai
In recent years,reactive distillation,which combines reaction and separation in the same vessel,has been given extensive attention.This article reviews the development of simulation and design for reactive distillation process,the steady-state multiplicities and industrial applications of reactive distillation.Major factors and existing problems of the technology are also given.On the basis of the research advances,a future research trend is pointed out.
2002 Vol. 19 (1): 101-106 [
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1895
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107
Estimation of the Rates for Freeze-Drying with Heat Radiation
CHENG Jiang,TU Wei-ping,YANG Zhou-ru,CHEN Huan-qin
A simplification for Sheng and Peck's freeze-drying model with heat radiation has been made in this paper.Linear distribution of temperature within the dried layer during sublimation is assumed instead of the error function profile proposed by Sheng and Peck.Therefore,an explicit expression for predicting the time required to remove the free water and the bound water in products during a freeze-drying process has been developed.The model suggests that sublimation and desorption may take place simultaneously in the sublimation stage.Good agreement has been found by comparing with Sheng and Peck's prediction data for freeze-drying of beef and poultry meat.The method is suitable for engineering application because of its simplicity.
2002 Vol. 19 (1): 107-112 [
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113
Primary Study on Molecule Design Based on Genetic Algorithm
LI Chun-li,GUO Zhang-hong,YANG Zhen-sheng
The paper presents a novel Computer-aided molecular design (CAMD) method based on genetic algorithm.The code scheme is established on the basis of UNIFAC groups.Besides modifying selection,crossover and mutation operators in simple genetic algorithm,two new kind operators are introduced.The application of the approach is illustrated with an example.
2002 Vol. 19 (1): 113-118 [
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119
Prediction and application of the Crystal Morphology
ZHANG Ying, WANG Jing-kang, FENG Tian-yang, HUANG Xiang-rong
The development of structural models for predicting the external morphology of crystalline materials is presented. BFDH law and attachment energy method(AE Model) were applied to α- glycine crystal.
2002 Vol. 19 (1): 119-123 [
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124
Synthesis of Poly( d,l -lactide)
YUAN Xu-bo, LIU Ping, ZHU Deng-wu, LI Er-qiu,SHENG Jing
Poly( d,l -lactide) was synthesized with the ZnO,SnCl\-2 or Stannous Octoate as catalyst,respectively. The molecular weight was measured by chemical titration and viscosity. The resultant poly( d,l -lactide) was characterized by FTIR and DSC. The result shows the polymer is amorphous,and Tg is 53.3℃.
2002 Vol. 19 (1): 124-128 [
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129
Study on the Mechanic Properties of Polyetherurethane
MENG Shu-xian 1,WEN Xiao-na 2,QIU Xun-gao 1,FENG Ya-qing 1
Mechanic property of polyurethane(PU) was studied. The effects of the solid content,soft/hard segment levels and chain extenders on material's intrinsic viscosity,elasticity,hardness and mechanic property have been observed.
2002 Vol. 19 (1): 129-132 [
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133
The Application of Bioreactors in Tissue Engineering
LI Xiao-jun 1, CHEN Li-gong 1, YAO Kang-de 2
Tissue engineering is a developing interdisciplinary field. The culture of cells and tissues in vitro is one of the keys. The application of bioreactors in an effective approach to obtain cells and tissues useful for clinical application economically. Mainly focused on the application of bioreactors in tissue engineering,the progress in the researches of bioreactors was reviewed in this paper.
2002 Vol. 19 (1): 133-136 [
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2002 Vol. 19 (1): 137-141 [
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