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Current Issue
2003 Vol.20 Issue.2,
Published 2003-03-15
Article
Article
63
Study of Heat Transfer Enhancement on Wheat Black Liquor in a Novel Three-Phase Circulating Fluidized Bed Evaporator
GAO Zhen-nan,JIA Yuan-yuan,LI Xiu-lun
A novel vapor-liquid-solid three-phase circulating fluidized bed evaporator is applied to vaporize wheat black liquor.Influence of several parameters,including heat flux,flow rate and volume fraction of particles,on flow boiling heat transfer coefficient is discussed.It shows that the three-phase flow boiling hear transfer coefficient increases with the augment of the heat flux,the flow rate of black liquor and the volume fractions of solid particles.Furthermore,as for fluid as viscous as black liquor,using such an evaporator can promote heat transfer coefficient with particles by 20%～30% than that of two-phase without particles.
2003 Vol. 20 (2): 63-66 [
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67
Catalytic Synthesis of Piperonylene Propanal by KF/Al_2O_3
NA Ping1,HUANG Zong-liang1,LI Liang-long2,YU Yan-dong2emical Engineering and Technology,Tianjin University,Tianjin 300072,China;2.Perfumery.of.Jianzhong Chemicals,Sichuan Yibin 644000,China)
Piperonylene propanal was synthesized through Claisen-Schmidt condensation reaction in the presence of KF/Al2O3,heliotropin and propanal as reactants.Adaptive technological conditions have been determined by statistical experiment.The yield of parallel experiment was 802% under the reaction conditions which are 60℃～70℃,03mol heliotropin and 042mol propanal as reactants,14g KF/Al2O3 catalyst,the dropping time of propanal 2h,reaction time 2h.
2003 Vol. 20 (2): 67-70 [
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1947
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71
Influence of Structural parameters of Corrugated Plate Packing on Performance of Axial Mixing in Liquid Phase
JIA Shao-yi,REN Yi-kai,ZHAO Jin-duo
The influence of structural parameters of corrugated plate packing on performance of axial mixing in liquid phase was investigated in 300mm ID packing tower with air-H2O-KCl system.The results shown that the axial backmixing parameter Pe increases with increasing the drilling rate and the inclination angle β and with decreasing the unit height of the packing H. The results are of value to development and design of corrugated plate packing.
2003 Vol. 20 (2): 71-75 [
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2029
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76
The Synthesis of 3-Chloro-2-Nitrobenzene
CHEN Lei, FENG Rong-xiu, ZHANG Jing, SUN Guo-peng, SONG Jian
The paper relates to the synthesis of 3-chloro-2-nitrobenzene. Using 2,6-dichloroamine benzene as reaction material through diazo, substitution, hydrolization and condensation can be synthesized 3-chloro-2-nitrobenzene. The best condition of synthesis is foun. The invention mainly studies hydrolization and condensation process.
2003 Vol. 20 (2): 76-79 [
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1676
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80
A Precision Solution for Unsteady-State Diffusion in Semi-infinite Medium
ZHANG Hai-yan, SHAO Shan-gen, SHAO Qing
A method for determining precision solution of a mass transfer differential equation for an unsteady-state diffusion and reaction process in a semiinfinite medium is presented. The semiinfinite medium may be solid or fluid. A component A is absorbed on the surface of the solid or in fluid phase,diffuses unsteadily, and reacts in the phase. The reaction component A is considered as one order. The precision solution of the unsteady-state diffusion model in the finite medium is given.
2003 Vol. 20 (2): 80-83 [
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1895
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84
Research Progress of Acrylate Copolymerical Emulsion
ZHANG Xin-ya, TU Wei-peng, CHENG Huan-qin
Polyacrylate emulsion is a kind of preparing easily and applying widely copolymerical emulsion with excellent performances, which can accord with the demands of environmental protection. In this paper the auhors discuss the formulation design of synthesizing acrylate copolymerical emulsion systemically, such as various property of monomers, emulsifiers,initiators, chain transfer reagents, pH adjuSt additives and other additives, their actions and their effects on the performances of acrylate copolymerical emulsion during synthesis. Synthetic technologies such as core-shell emulsion polymerization, free-soap emulsion polymerization,organic-inorganic incombination emulsion po1ymerization, group transfer polymerization,interpenetrating netWork polymerization, micro-emulsion polymerization and super micro-emulsion polymerization and some other new polymerization technologies and applications in building coatings and adhesives of acrylate copolymeric emulsion are summarized in this paper.
2003 Vol. 20 (2): 84-88 [
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2086
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89
Development of Waterborne Wood Paints
LIU Rui-yuan\+1,QU Jin-qing\+2,XIE yang\+1,CHEN Huan-qin\+2
With the restrictions of environment regulations on volatile organic compounds(VOC)in coatings,cnvironment friendly waterborne paints become developing trends of coatings technology.The new developments of polyacrylate emulsion and water-borne polyurethane wood paint were viewed.The trends of waterborne wood paint were pointed out.
2003 Vol. 20 (2): 89-94 [
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95
Surface Modification and Anti-Fouling of Polymeric Membranes
YUAN Xiao\|yan1,SHENG Jing1,LU Xiao\|long2,SHEN Ning\|xiang1,MIAO Yi\|xiang1,WANG Run\|yu1
Surface modification and fouling of polysulfone(PS) membranes as well as polyacrylomitrile(PAN)membranes were studied by grafting acrylamide with the initiating systems of Ce4+/-OH and Fe2+/H2O2 after pretreatment by K2S2O8 and alkaline respectively.The surface modified membranes were verified by infrared spectroscopy and X-ray photoelectron spectroscopy.Results showed that the anti-fouling ability of both PS and PAN membranes with respect to bovine serum albumin was improved after surface modification though the water flux was reduced.
2003 Vol. 20 (2): 95-99 [
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1791
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100
The Middle Insensitive Phenomenon of Ejector While Two Throats Matching
LIU Xue-wu1, JIN Liang-an2, LI Zhi-yi1
In this paper has been discovered middle insensitive area of ejector in the matching between throat of the gradually expanding tube and that of nozzle. The middle insensitive area was brought by the various peculiarity of the flow field. The appearance time was decided by the throat of nozzle, the pressure at in and out area,and the difference of the pressure of them;The criterion of the appearance time was brought out through numerical method to dispose experiment data. When the throat of the gradually expanding tube in round D扩=155d+k×Pcm/Pp×(lnΔP-2.3) the middle insensitive area will appear.
2003 Vol. 20 (2): 100-103 [
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2209
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104
Optimization of Technological Conditions for Synthesis of Diisopropyl Ether from Propylene and Isopropanol
DING Chang-sheng
This paper investigated the synthesis of diisopropyl ether by direct etherification of propylene and isopropanol in an industrial reactor on thousands ton scale.Effects of main technological parameters in the reaction on the reactive results have been explored.The optimum operating conditions in synthesis of diisopropyl ether have been determined.
2003 Vol. 20 (2): 104-107 [
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1728
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108
Acylation of Gelatin and Application
YANG Mu, HUANG Ming-zhi
The amino groups of the gelatin are the amenable sites for modification in aqueous solution. Benzoylation of the gelatin with pathalic anhydride can change the solubility. The reaction with dicarboxylic acid anhydrides results in an acid addition product,which alters the ratio of free basic to free acidic groups in gelatin,so as to lower the isoelectric point. So these products have a lot of new characteristics and uses. Benzoylated gelatin is widely used for the coagulation of photographic emulsions and succinylated gelatin is utilized as a blood plasma expander.
2003 Vol. 20 (2): 108-111 [
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1791
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112
Industry Synthesis and Application of N,N-DMA
WANG Bao-he, ZHANG Jun
N,N-dimethylacrylamide(N,N-DMA) is an important fine chemical,which is now widely used in more and more fields. In this paper the main chemical and physical property of N,N-DMA are introduced. The structure specialities of it are highlighted. Main industry synthesis methods are briefly introduced,which include the method of vinyl chloride and the method of methyl acrylate. The current application conditions and future prospect of N,N-DMA in many fields are emphasized.
2003 Vol. 20 (2): 112-115 [
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1598
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116
The Synthesis of Polyethylene Glycol Adipate
WANG Ying,WANG Kang,CUI Li
2003 Vol. 20 (2): 116-118 [
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2273
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6
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119
Correlation of Vapor-Liquid Equilibria for Ethanoic-Water System Using Chemical Theory
ZHU Liang,LIN Ke-zhi
2003 Vol. 20 (2): 119-122 [
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1665
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123
The Heat-Transferring Intensification in Evaporating the Heat-Sensitive Material and the Industrial Application
SONG Xing-xing,ZHU Ze-hua,HUANG Jing,FU Song-bao,XIAO Jun-qin,WANG Han
2003 Vol. 20 (2): 123-125 [
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1716
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