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Current Issue
2003 Vol.20 Issue.6,
Published 2003-11-15
Article
Article
313
Application of Uniform Design in Optimizing Properties of Polyurethane Coatings
XIA Zheng-bin,ZHANG Yan-hong,TU Wei-ping,CHEN Huan-qin
The main factors which have significant effects on the properties of two package acrylic polyurethane coating were investigated by using Uniform Design experimental method,and the regression analysis and multi-aim optimization calculation were used in the data analysis of experimental results. The suitable valuation range of the four parameters as glass transition temperature,concentration of OH group,molecular weight and the molar ratio of NCO/OH, were confirmed. On the basis of those studies,a kind of two-package acrylic polyurethane coating with excellent performance,such as excellent weatherability and thermal stability,etc,were manufactured.
2003 Vol. 20 (6): 313-318 [
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319
Study on Melting and Crystallization Behaviorof PET-PTMG Poly(ether-ester)
JIA Hong-tao,ZHAO Yun-hui,SHENG Jing
Poly(ether-ester)s based on poly(ethylene terephthalate)poly(tetramethylene glycol) (PET-PTMG) were synthesized by melt polycondensation. The melting and crystallization behavior PET-PTMG poly(ether-ester) were measured by DSC and polarizing optical microscope. The effect of poly(ether-ester) composition on its melting temperature,crystallization temperature,crystalinity and crystal morphology was discussed. Results showed that the melting temperatures of poly(ether-ester) are well correlated to composition by Baur's equation. Poly(ether-ester) possess a two-phase morphology consisting of crystalline and amorphous regions.
2003 Vol. 20 (6): 319-323 [
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4338
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324
Preparation of MTBE by SlurryCatalytic Distillation New Process
XU Jing,XUE Yan,XU Chun-jian,ZHOU Ming
In this paper,a new catalytic distillation process of methanal hydration reaction catalyzed by ion exchange resin as a model reaction was studied.The catalyst is fine particles of about 4μm in diameter and forms slurry with feed.Then it is fed into a packed distillation column reactor.The effects of catalyst concentration,reaction temperature and pressure,feed concentration were experimentally investigated.The results indicate that the new process may operate steadily and methanal conversion was up to 99.7% in experimental condition.
2003 Vol. 20 (6): 324-328 [
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1930
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329
Study on Preparation of Silicone Rubber-Hydrogel Semi-IPN Membrane
ZHANG Chun-xue,SHENG Jing
The semi-interpenetrating polymer network membrane based on silicone rubber and hydrogel was prepared via swelling the crosslinked polyvinylmethylsioxane in 2-hydroxy ethyl methacrylate monomer solution and then in-situ polymerization of the monomer.The morphology on the cross section of the membrane was observed by Scanning Electron Microscope (SEM). X-ray Photoelectron Spectroscopy (XPS) was used to investigate the surface structure of the membrane.The swelling property and drug delivery behavior of this membrane were also tested in physiological saline.The results show that this membrane can swell in water,hence it is considerably permeable to low molecular weight drugs.
2003 Vol. 20 (6): 329-332 [
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333
Synthesis of Ethyl 3-hydroxybutyrate by Dehydration
WANG Yan-fei,MA Pei-sheng,WANG Jia-ning,XIA Shu-qiancal Engineering,Tianjin University,Tianjin 300072,China)
Preparation of ethyl 3-hydroxybutyrate from 3-hydroxybutyric acid and ethanol was studied.Reaction was carried out in a Soxhlet extracting set,with paratoluenesulfonic acid as catalyst and CaO,molecular sieve type 3A or MgSO_4 as dehydrating agent.Various reaction parameters were also examined.Experimental results showed that the productivity of ethyl 3-hydroxybutyrate was obviously improved by adding dehydrating agent and water carrier in the reaction system.The productivity of ethyl 3-hydroxybutyrate could be attained 96.6% under the following optimum conditions:3-hydroxybutyric acid 0.1mol,ethanol 0.12mol,paratoluenesulfonic acid (0.717 5g),cyclohexane 50mL,CaO18.7g and reaction time 3h.
2003 Vol. 20 (6): 333-336 [
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337
Study on the Thermodynamics of Crystallizationof Ceftriaxone Sodium
PAN Jie,WANG Jing-kang
The solubility of Ceftriaxone sodium in acetone-water solvent in different temperature has been measured by using gravimetric method.And the data of solubility is obtained through regression of solubility model——the equation of λh.The metastable zone for crystallization of Ceftriaxone sodium in acetone-water solvent in different tempreature was studied by laser method.This study aims at supplying valuable thermodynamics data for industrial manufacture of Ceftriaxone sodium.
2003 Vol. 20 (6): 337-341 [
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342
Experimental Study on the Separation of Isopropanol andWater by Adsorptive Distillation
ZHAO Peng~1,XU Chun-jian~1,ZHOU Ming~1,LI Hong-wei~1,SHENG Zhao-shun~2SHANG Jian-feng~2,WANG Dong-mei~2
The separation of isopropanol-water mixture was experimentally studied by the hybrid separation process——adsorptive distillation.The fine powder of 4A molecular sieve was selectd as absorbent and glycol as liquid carrier of the powder.Under the following experimented conditions,feed composition is 85%;recycling ratio is 2∶1;reflux ratio is 1∶1 and solid content is 15kg/m~3,the purity and yield of isopropanol (IPA) is up to 99.7% and 95.3% respectively.
2003 Vol. 20 (6): 342-346 [
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347
Synthesis of Morpholine Derivatives
XING Peng,WANG Yong,CHEN Li-gong
The synthesis of morpholine derivatives was investigated in this paper,particularly,synthetic technology of N-methylmorpholine from morpholine,formaldehyde and formic acid,N-methylmorpholine was isolated in the yield of 92%.The technology for production of N-methylmorpholine oxide was established in this paper.Synthesis of moclobimide and N-(2-aminoethyl) morpholine,an intermidiate of moclobimide,was also examined.
2003 Vol. 20 (6): 347-350 [
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351
Preparation and Application's Research of Re-emulsified Powder Resin
LIU Zhi-hua~1,GAO Zheng-hong~1,LIU Rui-hua~2
For obtaining the high performance of mortar,the proportioning of styrene-acrylic acid latex has been studied.For convenience to transport and handling.The latex under the optimum proportionating was transformed to re-emulsified powder by spray drying.It stands comparison with imported resin from BASF,and can meet with the need of architecture engineering.
2003 Vol. 20 (6): 351-354 [
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355
Study on Properties of Self-Assembly of Ionic-Nonionic Mixed Surfactants in Aqueous Solution
WANG Bao-guo~1,LIN Xian-li~1,TIAN Qing~2,YANG Xue-song~1,LI Wei~1
Self-assembly properties of surfactants play important roles in the biomimetic synthesis,which used surfactants as templates.The mixed surfactants exhibit many novel features which have important theoretical and applied interest.It is time-consuming and highly expensive to determine the optimal self-assembles from surfactants mixtures only through experimental observations.In this article,a model for self-assembly of an ionic-nonionic mixed surfactant is established based on thermodynamic principles,which involves free energy changes of micelle mixtures.In comparison with references data and experiment results,it is indicated that the esablished model can used to well estimate the regulations of the mixed ionic-nonionic system,such as the mixed CMC,the micelle compositions and so on.
2003 Vol. 20 (6): 355-360 [
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361
Research and Application of Supercritical Water and Supercritical Water Oxidation
HOU Cai-xia,MA Pei-sheng
The critical point of water is 374℃,22.1MPa.In a supercritical environment,water has many different properties from that of normal condition,which results to its multiple uses.Supercritical water oxidation is a new waste treatment technology.It has the characteristics of complete and quick oxidation of toxic material.This paper discussed the special properties of SCW,the basis of the SCWO process and reactor.It also reviewed the progress of research and application in this field.
2003 Vol. 20 (6): 361-366 [
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1668
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367
Wet Chemical Synthesis of Microwave Dielectric Ceramic
YANG Yu-qing, SONG Kuan-xiu
Wet chemical methods are effective to prepare microwave dielectric ceramic.Coprecipitation,hydrothermal synthesis,sol-gel method and citrate method all can manufacture high pure ceramic with small size,well-distribution and good microwave property.In this paper,recent progress of these methods is summarized and the existing problem is analyzed.
2003 Vol. 20 (6): 367-371 [
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3478
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372
The Development Status of Power Mechanochemistry and Starch Micronization
HU Fei
The theory of power mechanochemistry,history and development of different damaged starch were summarized.The study direction and application scope were also forecasted.
2003 Vol. 20 (6): 372-376 [
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377
Application of Flocculation Technology in the Purification of Chinese Traditional Medicine
ZHANG Zhong-guo,KANG Yong,FENG Ying,ZHANG Yu-xin
In this paper,the application and study of flocculation technology used in the field of Chinese herbal medicine are summarized.The flocculants used in the field of Chinese traditional medicine and factors affecting flocculation process are presented.It is elucidated that flocculation technology is more effective and practicable than water-extraction and alcohol-precipitation method in the aspects of purifying effect,stabilization of liquid medicine,percent recovery of useful matter,production cost,production cycle,curative effect,and so on.
2003 Vol. 20 (6): 377-386 [
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387
Hydrodynamic Cavitation and Its Applications
WU Jun,ZHANG Xiao-dong,LIU Xue-wu,XIA Yuan-jing,LI Zhi-yi
The hydrodynamic cavitation phenomenon included inception, development and the collapse of the hydrodynamic cavitation has been reviewed.Three models have been proposed to explain the cavity collapse. The high pressure and temperature which the collapsed cavities generated can be used as a method of energy imput. The paper also includes that the hydrodynamic equipment and the applications. This is important for the further research.
2003 Vol. 20 (6): 387-391 [
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392
Development of Natural Gas Vehicle
GUO Yu-gao~1,MA Pei-sheng~1,XIA Shu-qian~1,HUA Chao~1,XIE Qing-sen~2., Tianjin University, Tianjin300072, China;2.School of Mechanical Engineering, Tianjin University, Tianjin 300072, China)
Being one of the clean energy sources, natural gas has been becoming the substitute of vehicular fuel. Having many advantages and great potential, natural gas vehicle is being the researching focus of vehicle. And there have been several kinds of natural gas vehicles running on the road. The storage technologies of natural gas were discussed detailedly in this paper. It was found that many problems of chemical engineering must be solved. First of all is to develop fuel-containing solvents for the NGV. At the same time, the features, development status and market potential for all kinds of NGV have been analyzed.
2003 Vol. 20 (6): 392-396 [
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1721
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397
Modification and Research of Liquid Distributor in the Packed Column
QIN Zong-gen, TU Wei-ping
2003 Vol. 20 (6): 397-401 [
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1732
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402
Fractional Crystallization Method Adopted in p-Aminophenol Wastewater Treatment
ZHANG Zhi-gang~1,BAO Jia-kun~2,WANG Yi-ping~2,ZHANG Ping-fan~3
2003 Vol. 20 (6): 402-405 [
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1596
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406
Effect of Microstructure on Mechanical Properties of Polymer Blends
YANG Shi-hai,SHENG Jing
In this article,the effect of microstructure on mechanical properties of blends was studied using polypropylene/polyamide-1010(PP/PA1010) as model blends,and predicted blends tensile strength with micromechnical models.The ratio of average chord lengths of the two phases (L1/L2) and mass center distance (D) were used to characterize blends microstructure.Tensile strength was found to decline with increase of the ratio of average chord lengths of the two phases (L1/L2) and mass center distance (D).The minimum fraction of dispersed phase calculated was found close to the phase inversion region determined by observing the blend morphologies.In compatibilized system,the theoretical value was found to be very close to the experimental data due to the improved interface adhension.
2003 Vol. 20 (6): 406-410 [
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411
A Group Topologic Space Method for EstimatingEnthalpies of Vaporization at Normal Boiling Pointsfor Organic Compounds
WANG Lei,XU Wen
A group topologic space method for estimating enthalpies of vaporization at normal boiling points for organic compounds has been proposed.Expression for estimating enthalpy of vaporization at boiling point has been proposed,with the numerical values of relative group parameters presented.The average percent deviation of estimation of the enthalpy of vaporization at boiling points is 1.052,comparing with the common used methods,our proposed method shows high accuracy and reliability.
2003 Vol. 20 (6): 411-415 [
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416
Preparation of N,N′-Diallylurea
GUO Wen-lin~1,YAN Xi-long~1,CHEN Li-gong~1,ZHANG Jing~2
The synthesis of N,N′-diallylurea was studied in this paper.It was obtained through amination and acylation from allyl bromine in 56.7% yield.In another synthetic route from urea and allyl bromine,the phase-transfer catalyst was employed and the resulting product can be also obtained.
2003 Vol. 20 (6): 416-419 [
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1967
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420
The Study on Induction Period of Cefoperazone Sodium
LI Yan-bin,WANG Yong-li,GUO Zhi-chao,WANG Jing-kang,LANG Lin,PAN Jie
Cefoperazone sodium is an antibiotic of the third cephalosporin,and of an important status.The needle-like crystal of CPZ can be gained by solvent out crystallization.In this paper,the primary nucleation induction period of this kind crystallization method was studied.Firstly,the solubility of CPZ in different temperature and acetone concentration were measured.Then,according to the solubility,the induction periods were measured in different S,and the effect of acetone concentration on the induction period was discussed.In addition,the induction period in the presence of ultrasonic was determined and experimental evidences showed that ultrasonic can has it reduced.
2003 Vol. 20 (6): 420-424 [
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425
Catalytic Behavior of Fluidized-Bed Catalystfor Oxidation of n-Butane to Maleic Anhydride
WEN Yu-long,XU Wen
The effects of orthophosphoric acid concentration in precursor preparation on the catalyst behavior have been studied.For the catalysts prepared at higher concentrations of acid,the quantity of V~(4+) phase (VO)_2P_2O_7 is quite large,and the n-butane conversions are all considerably high.With decreasing the acid concentration in precursor preparation,the relative amount of V~(5+) phase δ-VOPO_4 and the n-butane conversion increase continuously,whereas the selectivity to MA increases at beginning and then decreases after it reaches a maximum value.The catalyst prepared at the acid concentration of 95.0% gave the maximum yield of MA of 45.49% at an inlet n-butane concentration of 4.0% and a space velocity of 500h~(-1).
2003 Vol. 20 (6): 425-428 [
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429
Study on the Purification of Nerol and Geraniol by Vacuum Batch Distillation
HANG Jin-yu,ZHANG Hai-ying,CHANG He-ying,WANG Hua
Nerol and geraniol are important fragrant additives widely used in many areas.Both of them are temperature sensitive materials and the difference of the boiling point between them is 2℃ only.Vacuum batch distillation may be preferable for processing temperature-sensitive materials.In the previous study on the purification of nerol and geraniol by vacuum batch distillation,the temperature of still pot was high,the period of experiment was too long and yield was small(46%) though distillate of nerol's purity above 90% were gained.Distillation at lower pressure results in lower temperature of still pot and higher relative volatility,and operation for a constant product of composition at the column top is mostly applied to separate batches of binaries.In this paper,the effects of operational conditions such as time of total reflux,reflux ratio pressure on the purity of nerol and geraniol are investigated.This research chooses following experimental conditions of distillation:600 to 700Pa operational pressure,temperature of still pot at about 152℃,top temperature at about 80℃,5.5h to 6h time of total reflux,reflux radio varying from 20/1 to 5/1,and (4 800) to (4 900)Pa pressure drop of column.By one-pass distillation operation under the condition described above,nerol and geraniol were gained with yield up to 65% and purity above 90%.The experimental results provided an important basis for technique innovation in factories,for the total cycle time is adoptable and the process is steady without thermal decomposition.
2003 Vol. 20 (6): 429-433 [
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434
Synthesis and Characterization of Macromonomer Prepared by the Reaction of Polyether with Maleic Anhydride
L Shi-jun, GUO Rui-wei
The structure of macromonomer (MM)synthesized by reacting polyether polyol with maleic anhydride(MA) was characterized with GPC,(()~1H)-NMR and double-bond titration.The results indicated that,besides the reaction of polyether with MA,the procedure also involved many chemical reactions including double-bond isomerization and double-bond addition.For double-bond addition,the molecular weight of MM increased,and the content of double-bond became less.Reaction temperature palyed an important role on the properities of MM which,including the content of double-bond,double-bond isomerization and molecular weight,resulted in the stability.At 120 ℃,the stability of MM was best.
2003 Vol. 20 (6): 434-437 [
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438
Synthesis of Quaternary Ammonium Salt of Chitosan and Its Flocculation on Tannin
SUN Duo-xian, XU Zheng-yi
A water soluble chitosan derivative with quaternary ammonium salt,N-(2-hydroxypropyltrimethyl ammonium) chitosan chloride(HTCC) was prepared.IR spectra revealed that the substitution reaction occured mainly on the amine groups of chitosan.Flocculation of HTCC on tannin,one of the main foreign matter in herb extraction liquid was explored.The result showed that HTCC has stronger coagulating ability than that of chitosan on removing tannin.Moreover,HTCC has a wide of dosage application range,which is favorable for industrial application.
2003 Vol. 20 (6): 438-442 [
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443
Lipase-Catalyzed Synthesis of L-Ascorbyl Palmitate in Non-aqueous Phase
LIU Chang-bo, GAO Rui-chang
Lipase-catalyzed synthesis of L-ascorbyl palmitate in non-aqueous phase was studied in this paper.The appropriate lipase and non-aqueous medium were obtained,and several factors which effect the reaction were studied.The results show that the optimum reaction conditions are:the Lipase of Novozyme 435 and tert-butyl alcohol are the optimum pair,the molar ratio of palmitic acid/Vc is 3/1,the reaction temperature is 59℃,the reaction time is about 50h,the content of Novozyme 435 is 10g·L~(-1),and the purity of L-AP is up to 95% after purified.
2003 Vol. 20 (6): 443-446 [
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447
Preparation and Some Properties of Egg Yolk ImmunoglobulinY(IgY) Against Influenza Virus
CHEN Dai-mei, SUN Shu-qing
Influenza virus was used as antigen to immunize laying chicken.The immunized egg yolks were isolate by two-step salt outing and one-step gel filtration methods to obtain purified IgY,of which purity is over 95% by SDS-PAGE analysis.The purified IgY was digested with pepsin (pH=4,37℃) to obtain smaller antibody Fab.The reaction activities of IgY and Fab was analyzed comparatively by competitive ELISA method,which shows digested IgY remaining about 70% of initial activity.
2003 Vol. 20 (6): 447-451 [
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1647
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452
Study on the Synthesis of Trifluoroethyl-Substituted Derivatives of Aniline
LI Sheng-yong~1, GUO Hong-sheng~2, YU Zhi-fang~1
Trifluoroethyl-substituted derivatives of Aniline are important intermediates in the synthesis of organic chemistry and biologically active compounds.Synthesis of the substance from aniline and hexafluoroacetone involves electrophilic addition,acylation and reduction.The three steps were studied in this paper.
2003 Vol. 20 (6): 452-454 [
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1662
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455
Study on the Synthesis of 2-Benzyl-4-Chloro-Phenol
ZHANG Jing,SONG Jian,FENG Rong-xiu,SU Jing-xin
2-Benzyl-4-chlorophenol is an excellent disinfectant.4-Chloro-phenol and benzyl chloride were stirred and heated at the presence of ferric trichloride as the catalyst.2-Benzyl-4-chloro-phenol was obtained.The yield is between 77% and 78%.The purity of the product by two-step distillation is 97.78%,mp:43.43℃～46.10℃.The factors affecting the yield were studied,and the optimally selected parameters were obtained.The products were analyzed with HPLC and IR.
2003 Vol. 20 (6): 455-458 [
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1622
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459
A Study of Collecting and Purifying Gensingside Rb_3
HAN Jin-yu,LI Yi,WU Yi-lin
By using acetone directly crystal,n-Butanol extraction,and HPD-100 medical adsorption resin to purify and collect the gensengside Rb_3 are studied.The effectiveness and feasibility of the three methods are compared in two main aspects:Material quality once a time and the effectiveness of the purification.And concluded that resin is the optimum in industry.
2003 Vol. 20 (6): 459-461 [
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462
Positive Electrode Density Affects Positive Elextrode Features
WANG Yan~1,TANG Zhi-yuan~1,XU Zheng-rong~1,RONG Qiang~1,GENG Ming-ming~2
Applied battery charge-discharge instruments and inner resistance instruments positive electrode properties were investigated at different density.The results showed that proper density can improve the capacity of positive electrode,reducing polarization and prolong the life of battery.
2003 Vol. 20 (6): 462-466 [
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467
Synthesis of Methyl 4-Bromo-2-Butynoate
SONG Zhi-quan,SONG Jian
Propargyl alcohol was protected by dihydrophran with the catalysis of PPTS,and then reacted with Ethyl Mag bromide to prepare its corresponding Grignard reagent.Methyl 4-hydroxy-2-butynoate THP ether was obtained after reacting with methylchloroformate.Deprotection proceeded with the catalysis of PPTS,followed by mesylization and bromide displacement with sodium bromide to give methyl 4-bromo-2-butynoate.The overall yield was 53%.
2003 Vol. 20 (6): 467-469 [
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470
The Mechanism and the Conditions of Controlling in Multi-component Granulation
ZHANG Yi-min,YIN Xiao-peng
With the development of industry and agriculture,the technology of multi-component granule has been applied in many fields,such as food,pharmaceutical and fertilizers industry.Research in the mechanism and optimize the condition of controlling of multi-component granulation are needed to meet the necessity of production.The mechanisms of multi-component,especially the influences of binder on the product and the process of granulation were reviewed and the conditions of controlling were compared and predicted.
2003 Vol. 20 (6): 470-474 [
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475
Application of Reverse Micelles in Supercritical Carbon Dioxide Extraction
YANG Jing,LI Shu-fen
Supercritical extraction has become very popular in recent years.Supercritical carbon dioxide can be used as a replacer for organic solvents,which enables the development of green processes.However it is a very poor solvent for high molecular weight,hydrophilic molecules.and metal ions.By using reverse micelles to solve this problem,a wide variety of novel processes can be developed.A review of reverse micelles in supercritical carbon dioxide system is presented in this paper including the principles and application,especially in supercritical carbon dioxide extraction.
2003 Vol. 20 (6): 475-479 [
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480
Research Progress on Small Molecular Materials Used for Organic Electroluminescence
ZHANG Li-jie,ZHOU Xue-qin,LI Wei,LIU Dong-zhi
Organic electroluminescence (OLED) is recently a research highlight in the world.Organic electroluminescent devices have such advantages as low-voltage driving,high luminosity,high efficiency and large-area color display which can be realized.The development process of OLED was reviewed.Various kinds of organic molecular materials used for OLED at present were discussed in detail.The applications of OLED were forecasted.
2003 Vol. 20 (6): 480-486 [
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487
Grafting Polymer onto the Surface of InorganicOxide Nanoparticles
XIE Yang,YAO Su-wei,BAI Shi-he,ZHANG Wei-guo,WANG Hong-zhi
Various reactions that graft polymers onto the surface of inorganic oxide nanoparticles,such as the copolymerization of a monomer with an immobilized double bond at the surface of nanoparticles,the reaction between reactive polymer and the groups of the surface of nanoparticles,the termination of living polymer on the surface of nanoparticles and the graft polymerization initiated by the groups of nanoparticles were reviewed and evaluated briefly.The research of dendrimer was introduced.
2003 Vol. 20 (6): 487-490 [
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491
Progress in Research of Solid Acid Catalysts as Catalysts in Butene Alkylation
LIU Jian-guo,MA Zhong-long,WANG Li
The current development of the isobutene/butene alkylation catalysts has been introduced.The study situation of the alternative solid catalysts,i.e.solid superacid catalysts,zeolites and heteropolyacids,is emphasized.The preparation,selectivity,activity of the SO~(2-)_4/M_xO_y,MCM-41,heteropolyacids are mainly discussed in the paper.Finally,the problem of the solid acids catalysts and the future of the alkylation catalysts are also discussed.
2003 Vol. 20 (6): 491-496 [
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497
Preparation of Iron Oxide Nanoparticles and Its Doping Effect
LI Zhi-yuan~1,JIANG Bin~2,ZHANG Lü-hong~2,CHEN Ai-fan~3,LUO Rui-xian~3
As gas-sensing materials,iron oxide nanoparticles are paid much attention.The widely used preparations of the iron oxide nanoparticles in recent years such as sol-gel method,coprecipitation method,hydrothermal method,hydrolysis method are expounded and evaluated.After being doped different substance,the special gas-sensing properties of particles have been shown.The different sintering process of the gas-sensing components based on iron oxide has been compared.
2003 Vol. 20 (6): 497-501 [
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502
Application of Coupling Reaction for the Synthesisof Dimethyl Carbonate
TIAN Yi-ling,YU Jing-lin,CHEN Li,ZHAO Xue-feng
The properties,manufacturing methods and applications of dimethyl carbonate are simply reviewed.By applying function of thermodynamics,The synthesis of dimethyl carbonate(DMC)is discussed.It shows that using coupling reaction is the key to improving the yield of DMC.
2003 Vol. 20 (6): 502-505 [
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1744
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506
The Preparation and Crystallization Processes of 7-ACA
WAN Dong,WANG Jing-kang
7-aminocephalosporanic acid(7-ACA),a critical intermediates in the production of semisynthetic cephalosporanic antitiotics,plays an important role in the medical field.The research of praparation and crystallization processes of 7-ACA were reviewed.There are two kinds of methods for preparing 7-ACA,that is chemical cleavage and enzymic method.The cleavage and two-step enzymic method were introduced in detail.The crystallization process of 7-ACA was discussed too.The research direction of the preparation and crystallization process of 7-ACA has been predicted.
2003 Vol. 20 (6): 506-510 [
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1784
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511
Research Progress of 1,3,5-Benzenetriol
WANG Bao-he,YANG Nian-yong,ZHU Jing
There are some technical difficulties in the industrial synthesis of 1,3,5-benzenetriol,a costly important intermediate.Research progress of the synthesis was reviewed,followed by the analysis of yield,technology and industrial feasibility.Several industrial technology routes using cumene/benezene,2,4,6-trinitrotoluene,chlorobenzene and aniline respectively as a resource to produce 1,3,5-benzenetriol were recommended.
2003 Vol. 20 (6): 511-516 [
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1692
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5
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517
Discussion of the Technology Using Air to Oxidize Nitric Oxide
CHANG Ming-kun,HU Jin-bang,ZONG Run-kuan,WANG Jin-gang
This paper aims at the technology of disposing the nitrogen oxides in industrial flue gas,and discusses the methods to oxidize the nitric oxide.The main technical characteristics of these methods are compared with each other.The possibility that using air as oxidizing agent has been emphatically analyzed.The conclusion proves that oxidizing nitric oxide with air is economical and has a splendid future at application.
2003 Vol. 20 (6): 517-521 [
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1578
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522
Progress of Microorganisms in Bioorganic Fertilizer Production
ZHANG Yi-min,WAN Xian-kai
Fermentative microorganisms and mixed functional microorganisms are two important microorganisms,which can be used in the production of bioorganic fertilizer extensively.This paper reviews the progress of studies on the use of microorganisms in bioorganic fertilizer production.Because the solid organic waste is complicated,at the same time,the demands of preserving the nutrition and deodorizing are concerned,the fermentative microorganism has developed from single microbe to microorganisms.When we produce the bioorganic fertilizer with the fermented solid organic waste,some functional microbe such as nitrogen-fixing bacteria,phosphate-solubilizing bacteria and so on,can be added into material to meet the functional demands of the fertilizer.The paper points out that the form and function of the microorganisms will develop from singleness to multiformity in future.
2003 Vol. 20 (6): 522-526 [
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1721
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527
Extraction Essential Oil from the Residue of Eucalyptus Globulus Leaf Oil by Water Solvent Distillation
ZHANG Lan-tian,LI Shi-yu
This paper discussed a method-water solvent distillation to get the essential oil from the residue of eucalyptus leaf oil.In this way the decomposing of terpinyl acetate was avoided and the content of terpinyl acetate was 6.234%,the main content of α-terpineol was 30.409%. At the same time agglomerating was eliminated.
2003 Vol. 20 (6): 527-529 [
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1999
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530
2003 Vol. 20 (6): 530-532 [
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1275
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5
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