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Current Issue
1998 Vol.15 Issue.2,
Published 1998-04-15
Article
Article
3
Determination of Solvent Extraction Equilibrium for Molybdenum
Sun Lihuan Li Ping Ma Peisheng Xia Shuqian
n the paper,a set of apparatus used to determine the solvent extraction equilibrium was designed and established. Tributylphosphate was selected as solvent, and cyclohexane as diluent.The solvent extraction equilibria of Mo were determined systematically.The effects of different conditions on extraction equilibrium were studied and examined to provide some basis for industrial process design and engineering optimization.
1998 Vol. 15 (2): 3-7 [
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1764
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The Effect of Flame—Retardant System to Fire—Proof Performance of Intumescent Coatings
Xiao Xinyan Tu Weiping Yang Zhuoru Chen Huanqin
y orthogonal experiment method,intumescent flame-retarnant system which affects the retardance performance of the coatings was investigated systematically.Several components,such as ammonium polyphosphate (APP),melamine (MEL),pentaerythritol (PE),701 amino resin (701A) and chlorinated paraffin (CP),which affect the physicalchemical properties and fire-proof performance of the coatings markedly have been selected to investigate the effect of each factor and their interactions on fire-proof performance of the coatings.Considering the optimal formulations created,several experiments have been carried out in order to verify the validity of the formulations and the product has been produced in pilot plant and in industry.The result based on the big panel combustion method showed that the coatings meets the National Standard of the fire retardance for first-class products.
1998 Vol. 15 (2): 8-13 [
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1819
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14
The Synthesis of Trimethylolpropane
Zhang Weihong Feng Yaqing Dong Ning Hong Xuechuan Guo BingThe Synthesis of TrimethylolpropaneZhang Weihong Feng Yaqing Dong Ning Hong Xuechuan Guo Bing
he synthesis of trimethylolpropane from nbutanal and formaldehyde with NaOH catalyst via one step method was studied in this thesis.The aldol condensation product during low temperature period of one step method synthesis was separated and analyzed with 1HNMR and GCMS.It's proved that the separated product is 2,2-dihydroxymethylbutanal,which is unstable and can be converted to its dimer and trimer.The influences of the type of catalysts,the second period reaction temperature and time,the formaldehyde concentration and the treatment method after reaction on the yield of TMP were discussed.The purity of TMP was analyzed by GC.A potential synthesis method of TMP was set up.
1998 Vol. 15 (2): 14-18 [
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1866
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19
The Synthesis of Dimethyl Carbonate by Transesterification
Pan Helin Tian Hengshui Song Xinjie
imethyl carbonate has been synthesized by transesterification of methanol with propylene carbonate using CHS—1 and CHS—2 as catalysts.The effect of amount of catalyst and weight ratios of methanol to propylene carbonate et al.on the yield of transesterification have been studied.The experimental results showed that the optimum conditions are:the amount of catalyst 0.4%～0.5%,weight ratio of methanol to propylene carbonate 8～10 and reaction time 40～60 minutes.This process of transesterification by reactive distillation is of value in industrial production.
1998 Vol. 15 (2): 19-23 [
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1857
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24
The Synthesis of 2,4,6-Tribromophenyl Acrylate
Zhang Peng Wang Yiping
he synthesis method of 2,4,6-tribromophenyl acrylate with 2,4,6-tribromophenol,acrylic acid and phosphorus trichloride as raw materials are studied.By orthogonal tests and single factor optimization,the proper technological conditions are determined.The results of analysis and assay show that the expected product is obtained.The values of melting point,refractive index,bromine content,molecular weight,molecular constitution and fineness of product are also given.
1998 Vol. 15 (2): 24-28 [
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1838
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29
Separation of Dilute Organic AqueousSolutions by Pervaporation
Ding Yuhuei Liu He Liu Honggao Liu Jiaqi
ollowing the brief introduction of the present state of pervaporation,in this paper,the new progress of separation of dilute organic aqueous solutions by pervaporation was reviewed emphatically,and the development and studies of the organophilic or hydrophobic membranes and the analyses of the effect of the process parameters on flux and selectivity were summarized systemtically.At last,the application prospects of organic pervaporation process were discussed.
1998 Vol. 15 (2): 29-37 [
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2502
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38
Determination and Correlation of Vapor LiquidEquilibrium of Tertpentanol—Isobutanol
Wang Jiarong
inary vapor liquid equilibrium data of tertpentanol—isobutanol at atmospheric pressure are measured and correlated by MH81 equation of state.The calculated values are in good agreement with the experimental result.The data obtained are thermodynamically consistent.
1998 Vol. 15 (2): 38-41 [
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1944
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42
Preparation of a New Scale Inhibitor-Antiprecipitantand It's Scale Inhibiting Efficiency
Fang Hui Huang Xiaonan Xie Yajuan
crylic Acid/Acrylamine copolymer adding single or mixed organic complexants was prepared in order to improve the behavior of the copolymer in water treatment specially in inhibiting scale and antiprecipitating. The conditions of reaction and operating process were studied. IR, solid contents and characteristic viscosities of the products were determined. The results in a simulated evaporative test indicated that the percentage of scale (as Ca2+) inhibition is 966～978 when 12ppm(real solid)AA/AM copolymer adding mixed organic complexants was used.
1998 Vol. 15 (2): 42-47 [
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1709
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48
AC Type Membrane Coated Unit and Its Controlled Release Character
Li Qing
new AC type membranecoated unit was prepared. The coating solution composition and the number of layers of the membrane were changed to prepare different kinds of AC type controlled release unit, then controlled release experiments were carried out and theoretical analysis was made. It is proved that AC type membranecoated unit has a good controlled release character and its controlled release character may be adjusted by the content of ARW in the coating solution and the number of membrane layers.
1998 Vol. 15 (2): 48-51 [
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52
Study on Synthesis of 2-Amino-Naphthalene-6,8-Disulfonic Acid
Liu Fude Ge Ming Zheng Sihua
?-Amino-naphthalene-6,8-disulfonic acid has been synthesized by amination of 2-naphthol-6,8-disulfonic acid dipotassium salt at relatively low temperature(140℃)and low pressure(1-4MPa)with a yield about 100%. The factors which can affect the reaction have been investigated. It is found that while the reaction temperature, the amount of ammonia or NaHSO_3, the ratio of ammonia to 2-naphthol-6,8-disulfonic acid dipotassium salt and the concentration of ammonia increase, the reaction rate becomes faster.
1998 Vol. 15 (2): 52-55 [
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1798
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56
Determination of Cobalt and Manganesein Oxide Sediment TA
Li Xiuling
n this paper, determination of cobalt and manganese in oxide sediment TA has been investigated. A method employing strong basic anion exchange polymer to separate cobalt and manganese in oxide sediment TA, and then determine them using EDTA complexometric titration was established. The method has been applied to treat real samples with satisfactory results.
1998 Vol. 15 (2): 56-59 [
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1865
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60
Appraisement of Imported Crude Oil Processed in Refinery of Tianjin Petrochemical Co.
Chen Yiqun Wang Lixin
his article appraises the quatity of the typical imported crude oil in Refinery of Tianjin Petrochemical Co., explores the output rate and quality of products from the mixture of the imported and Dagang crude oil, and points out the problems existing and the future processing way of the imported crude oil.
1998 Vol. 15 (2): 60-65 [
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2347
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