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Current Issue
2004 Vol.21 Issue.2,
Published 2004-03-15
Article
Article
79
Influence of the Pretreatment in Surfaces of Supports on Zeolite Beta Membranes
LI Yun-hua,HUANG Shuang-yan,LI Yong-hong,HE Fei
Influence of the pretreatment in surfaces of supports on synthesis of zeolite beta membranes is enormous.The hydrofluoric acid and sodium hydroxide with different concentrations are used to treat various silicon-aluminum ceramic supports chemically in this paper. A series of conclusions are drawn:it takes one hour to treat surfaces of supports in 110 degrees centigrade and it does five minutes to treat surfaces of supports in 25 degrees centigrade.This is the optimal treatment condition.
2004 Vol. 21 (2): 79-83 [
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84
The Synthesis of MnFe_2O_4 Nanocrystals and Their Characterization
WANG Xiu-yu,YANG Gui-qin,YAN Le-mei,MENG Jian-hua,SUN Yi-huan
MnFe_2O_4 nanocrystals were prepared by low-temperature coprecipitation method,high temperature method and hydrothermal method respectively.And the samples obtained by the three methods were characterized by XRD,TEM and VSM.The preparation for MnFe_2O_4 nanocrystals using precursor with low-temperature coprecipitation method was studied in detail.Comparison and analysis of the three methods indicated that low-temperature coprecipitation method was optimal in the preparation of pure samples with small size.
2004 Vol. 21 (2): 84-86 [
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1751
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87
Synthesis of 2,6-Dichlorobenzonitrile
LIU Rui-xiang,YU Zhong-shen
2,6-Dichlorobenzonitrile was synthesized from 2,6-dichloroaniline by diazo reaction.Effects of reaction temperature,ratio of H_2SO_4 to CH_3COOH and pH value on the yield and purity of product were studied.The highest yield of 2,6-dichlorobenzonitrile was obtained under the conditions that n(H_2SO_4)∶n(CH_3COOH)=34∶1～1∶1,reaction temperature was 50℃ and the pH was between 7～9.After processed,the quality of cyanide waste-water was up to the emission standard.
2004 Vol. 21 (2): 87-90 [
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1712
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91
Study on the Racemic of N-Acetyl-D-Methionine
ZHANG Qing-yu~1,TAN Xin~1,ZHAO Lin~1,SONG Zheng-xiao~1,JIA Xiao-bo~2,ZHANG Xin-fa~2
In the process of resoluting methionine with enzyme,L-Met is isolated by ion-exchanger,the mainly remnant will be N-acetyl-D(L)-Met.After the racemic of the remnants,some N-acetyl-D-Met will be transformed into N-acetyl-L-Met,then they can be reused as the resolute substrate.In this paper,considering the not high yield and the poor quality of the products in the factories,we designed orthogonal experiments to analysis the factors which affect the racemic process.The appropriate conditions were got,the quality and the yield were improved as well.
2004 Vol. 21 (2): 91-95 [
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1651
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96
Study of C_1-Chemical Products in the Acetic Acid Synthesis
BEN Yu-heng,LIU Chang-jun,YU Kai-lu
In recent years,the research of C_1 in acetic acid synthesis has been greatly developed,which includes the development of rectisol process for carbonylation of methanol,the acetic acid synthesis by syngas, by reacting carbon dioxide with hydrogen and by reacting carbon dioxide with methane at plasma state.The paper summarizes development of C_1 chemistry in the acetic acid synthesis.
2004 Vol. 21 (2): 96-100 [
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1916
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101
Extraction and Separation of Amino Acid
ZHANG Jin-long,WANG Jing-kang,YIN Qiu-xiang
The separation techniques of amino acids extraction,such as precipitating method,ion-exchange,membrane separation,liquid-liquid extraction are reviewed.And crystallization,which is the critical step in purification of amino acids,are introduced systematically to be put emphasis on.
2004 Vol. 21 (2): 101-106 [
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2318
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293
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107
Advancement of Direct Partial Oxidation of Natural Gas over Monolith Catalysts
DI Li-hui,WANG Ya-quan,HOU Yong-jiangnjin University,Tianjin 300072,China)
The direct partial oxidation of natural gas is difficult to control because of its homogeneous reaction and high heat loss.Direct partial oxidation of nature gas over monolith catalysts in nearly adiabatic reactors with very high flow rates has been recommended.
2004 Vol. 21 (2): 107-111 [
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1777
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112
Extraction of Ethylene from Catalytic Cracking Dry Gas
ZHU Ying-gang~1,ZHAO Xin-qiang~1,BAI Yue-hua~2,WANG Yan-ji~1
The source of ethylene is insufficient at present in China.Extraction of ethylene from catalytic cracking dry gas is an efficient means to reduce waste and increase the output of ethylene.Technologies such as cryogenic separation,absorption separation,hydrate separation,membrane separation,adsorption separation and hybrid process have been introduced in this paper.And the technic-econimic comparison of some separation technologies is also made.The adsorption separation is considered to be a promising technology in industry.
2004 Vol. 21 (2): 112-116 [
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1765
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117
A Kind of Oscillation Phenomena on Interface——Saline Oscillation
ZHOU Yong-xian, HE Zhan-bo
An oscillatory flow of water is generated when a cup,with a small orifice in its bottom,and filled with saline water,is placed within an out vessel containing distilled water.The phenomena,the mechanism and the mathematical model are discussed,we brought forward that because of the gravity function and the original delicacy condition destroyed,the flow is taking place,and when the liquid flows up and down,the mobile phase of the double layer is carried along causing charge separation and the voltage is observed.By comparison between liquid membrane oscillator,artificial membrane oscillator and saline oscillator,some new opinions of the application are given.
2004 Vol. 21 (2): 117-120 [
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1937
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6
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121
Development of Downstream Products from Industrial Dipentene
LIAO Ying,FENG Ya-qing,NA Ping
The main downstream products from the industrial dipentene were reviewed,such as:some kinds of polyester,fine chemical intermediates such as p-cymene,p-menthane and flavours such as carvone,terpinyl acetate and so forth,the main characteristics and applications were also described in the paper.Conclusion that developing downstream products of cheap dipentene can make good economic and social profits is drawn.
2004 Vol. 21 (2): 121-124 [
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1665
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125
Development of Purified Phospholipids
AN Dao-qiang,LI Shu-fennjin University,Tianjin 300072,China)
In recent years,high purified phospholipids are in great need in pharmaceutical,cosmetic and food industries.Methods of producing high purified phospholipids have been reported.Technologies including solvent extraction,supercritical extraction,membrane filtration,column chromatography,HPLC are presented in this paper.
2004 Vol. 21 (2): 125-128 [
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1686
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129
Development of γ-Fe_2O_3 and Its Composite
GUO Xiu-ying,YAN Xiu-ru,SONG Kuan-xiu,TAN Jun-ru,BAI Tian
The present paper reviewed the preparations of different shapes of γ-Fe_2O_3 and its modifications to improve the magnetic properties.The preparation methods of γ-Fe_2O_3 ultrafine powders and its composites which have excellent properties in recent years were also summarized.The mechanisms of modification and coating were briefly introduced.
2004 Vol. 21 (2): 129-133 [
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1621
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134
Synthesis of the Novel Plant Growth Regulator CPPU
JIN Zhao-hui, ZHANG Feng-bao
The CPPU is a kind of novel plant growth regulator which has higher activities in promoting cell division,fruit setting and inducing parthenocarpy.It has got extensive application in agriculture and gardening fields.Some different synthesis ways of CPPU have been summarized and compared.It will be benefit for the future commercialization of CPPU.
2004 Vol. 21 (2): 134-137 [
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1781
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4
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138
Research and Advance of Starch Super Water Absorbent Resin
NIE Ming, TAN Shi-yu,WANG Xiao-hua
In this paper,research and development of starch super water absorbent resin are introduced.The preparation and application of starch super water absorbent resin are reviewed.At the same time,with analysis of its market potentialities and product cost,prospect of starch super water absorbent resin is made.
2004 Vol. 21 (2): 138-141 [
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1800
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142
Research Progress in Degradation of OrganicWaste by Photocatalytic Oxidation
GU Xue-qian,DONG Xiu-qin
As a new technique for disposal of contanminants,photocatalytic oxidation is being attached more importance.The mechanism,modification of catalyst,effective factors of catalytic reaction as well as combinations with other techniques were introduced briefly.The trends in the degradation of organic waste were also discussed.
2004 Vol. 21 (2): 142-145 [
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2398
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146
Synthesis of 2,3,5-Trichloropyridine
YANG Xiang-yu~1,SONG Jian~1,LOU Ke-xia~1,FENG Rong-xiu~1,LIAO Hua-xue~2,DUAN Wen-jun~3
2,3,5-trichloropyridine is a valuable intermediate for producing herbicidally effective compounds.In this paper,the process for producing 2,3,5-trichloropyridine from pentachloropyridine was studied.In the process,2,3,5-trichloropyridine was obtained by reacting pentachloropyridine with zinc powder in an alkaline medium at 75℃.The effect factors such as temperature,time,the amount of zinc powder etc were studied.Self-made Oldershaw column was employed to separate the resulting products and it can shorten the work-up procedures.The purity of 2,3,5-trichloropyridine was up to 97%,mp 48℃—49℃.
2004 Vol. 21 (2): 146-148 [
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1820
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149
Study on the Synthesis of Piperazine and Its Derivatives from Hydroxylamine
ZENG Tao,CHEN Li-gong,BAI Guo-yi
The synthesis of piperazine and its derivatives from hydroxylamine was discussed in this paper.From N-(2-hydroxy-ethyl)-ethylenediamine,piperazine was prepared in a cyclization reaction in a yield above 95%.A catalyst containing nickel,copper,chrome,zinc and manganese using γ-Al_2O_3 as carrier was selected.The optimum conditions were determined.2-methylpiperazine and cis-2,6-dimethylpiperazine were prepared according to the similar routes.
2004 Vol. 21 (2): 149-151 [
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152
Determination of Liquid-Liquid Phase Equilibrium Data in the Extraction Process of the Phenol Hydroxylation Products
FENG Hui-sheng,CHEN Wen-feng,LI Xiao-ping
The liquid-liquid phase equilibrium system in the dehydration of the phenol hydroxylation at 20℃ was studied,the extractants were isopropyl ether and 4-methyl-2-pentanone.The phase equilibrium curves of the system were determined by the turbidity and chromatogram method.The ternary phase equilibrium charts showed that the chosen extractants were efficient and practicable.
2004 Vol. 21 (2): 152-156 [
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1962
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8
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157
2004 Vol. 21 (2): 157-158 [
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