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1999 Vol.16 Issue.5,Published 1999-09-15
Article
Article
249 Study on the Stability of Cd(Ⅱ)┐ Arom atic┐ Diam ine┐ Am inoacid Com plexes
Yu Xiaocai Gao Enjun Shu Zhen Chen Hualing
In this paper, O benzyl tyrosine (btyr- ) Containing a big hydrophobic sidechain has been synthesized and characterized by I R spectra,the m elting point andthe elem entary analysis. The stability constant(lgβ)ofthe m ixed liqands com plexesoftype [ Cd L Aa]+ ,w here L= 2,2 bipyridyl(bipy)or 1.10 phenanthroline(phen);Aa= alanine(ala- ),tyrosine(tyr- ) and o benzyl tyrosine(btyr- )has been de term ined by p H potentiom etric titration in 20% (volum e fraction) Et O H w ater solu tion( I= 0 10( K N O3),25℃) According to Δlgk and thestructure ofligands,there is hydrophobic associationbetw en ligands in [ Cd( L)(btyr)]+
1999 Vol. 16 (5): 249-252 [Abstract] ( 1950 ) [HTML 0KB] [ PDF 0KB] ( 6 )
253 A Study on the Mass┐transfer Characteristics of Meshed┐sheet Corrugated Packings
Long Xiangli
Experim ents w ere perform ed on the hydraulic and liquid side m ass transferperform ance ofpackings in a Pyrex glass colum n of500m m internaldiam eter w ith apacking height of1.00m forallpacking types. The colum n w as operated in counter current w ith w ater air oxygen system . The liquid side m ass transfer characteristicsw as tested by stripping oxygen from a saturated w ater into air by m eans of the N T U H T U m ethod. The packing tested w as a type 250 Y. The experim entalresultsshow thatthe separative efficiency ofcom plexed m eshed sheetstructured packing isobviously higher than other structured packings in the sm allratio of liquid to gas. In com parison w ith the w ide use Mellapac packing the efficiency of the com plexedm eshed sheetstructured packing is high than 30% .
1999 Vol. 16 (5): 253-258 [Abstract] ( 1685 ) [HTML 0KB] [ PDF 0KB] ( 6 )
259 Preparation and Characterization of Poly( Vinylidene Fluoride) Mem brane Used for Enzym e Im m obilization
Wei Min Chang Jin Yao Kangde
This article w as concerned w ith the poly(vinylidene fluoride)( P V D F)m em brane,w hich w as used to im m obilize enzym e. The m em brane w as prepared by usingphase reverse m ethod. In the research w ork, P E G w as chosen as additive and m anyfactors w ere studied,such as evaporation tim e,coagulation tem perature,cast liquidtem perature,etc. The perm eability and enzym e im m obilization of P V D F m em branew ere evaluated.
1999 Vol. 16 (5): 259-262 [Abstract] ( 2249 ) [HTML 0KB] [ PDF 0KB] ( 5 )
263 The Characteristic of Fine Particle Fluid Bed forn┐ Butane Oxidation to Maleic Anhydride
Chen Baoliang Chen Mingm in Xu Genhui
The V P O system catalystoffluid bed w as studied. The reaction resultis per fect w hen the average particle diam eter of catalyst,used for n butane oxidation tom aleic anhydride,is 75 2μm . The Characteristic of residence tim e distribution w asm easured in fluid bed ofn butane oxidation,the param eters offluid feature w ere es tim ated. The function ofm ass transfer and property ofbackm ix w ere discussed.
1999 Vol. 16 (5): 263-269 [Abstract] ( 1998 ) [HTML 0KB] [ PDF 0KB] ( 5 )
270 Kinetice Study of Brom ide Oxidation on the Anode Electrode in Alkaline Solution
Wu Ailian Sun Yanping
Kinetic m odelw as presented for Br- oxidation on the anode electrode in alka line solution taking account ofthe side reactions and by theoretically analyzing theeffection of brom ine com plexing、hydrolysis equilibrium ofbrom ide and dissociationofhypobrom ous acid on the anode reactions. The reaction characteristic of Br- at arotating disk electrode w as abtained by stationary polarization and transient cyclicvoltam m etry. The m ain process at electrode reactions is Br- oxidation into Br2 byanalysis of the cyclic voltage current. The kinetic param eters w ere obtained by ap plying the m ethod ofnonlineer regressin. The expected results by the m odelare incorrespondence w ith the experim entaldata.
1999 Vol. 16 (5): 270-274 [Abstract] ( 1762 ) [HTML 0KB] [ PDF 0KB] ( 6 )
275 Study on the Catalysts Em ployed in Cyclisation ofβ┐ Hydroxyethylethylenediam ine
Chen Ligong Lu Meng Xu Zhengshuang Wang Duolu Fan Guoliang Zhou Weiyi
The catalytic perform ance of Cu/γ Al2 O3 and Cu O/γ Al2 O3 em ployed for cycli sation of β hydroxyethylethylenediam ine w ere studied in the present paper. Thesim ilar results w ere obtained from cyclisations ofβ hydroxyethylethylenediam ine byem ployed the above tw o catalysts under certain reaction conditions,the yield ofpiperazine w as up to 87% . Furtherm ore,m odification ofthe catalystw as carried outin order to increase ofthe selectivity and stability ofthe catalystw hen the catalystprepared from treated carrier w ith copper deactivator w as em ployed forthe cyclisa tion,piperazine w as obtained up to 92% yield. As the superfine pow der of γ Al2 O3w as em ployed as carrier,the stability ofthe catalystw as greatly im proved.
1999 Vol. 16 (5): 275-279 [Abstract] ( 1838 ) [HTML 0KB] [ PDF 0KB] ( 8 )
279 Developm enton Esterification Technology by Carboxylic Acid w ith Olefin to Prepare Alkyl Carboxylate and Advance in Catalyst Research
Zhu Jifang Liao Shijun
The advance in esterification by carboxylic acid w ith olefins to prepare alkylcarboxylate,including esterification technology and the catalysts research is intro duced. The catalystsinclude m ineralacid orsulphuric acid ,m etalsulphate,clay,ox ide,zeolite,heteropoly com pound,ion exchanged resin. Am ong the researched cata lysts,resin has higher activity and better stability for esterification by acetic acidw ith propylene and esterification by acetic acid w ith 1 butene;the heteropoly com pound is considered as the best catalyst for esterification by acetic acid w ith ethy lene by far.
1999 Vol. 16 (5): 279-285 [Abstract] ( 2479 ) [HTML 0KB] [ PDF 0KB] ( 6 )
286 Developm ent of Deflourination from W aterby Rare Earth Com pound
Li Xiaoyun Song Kuanxiu Yan Xiuru Wang Jianping
Application of Rare Earth com pounds in the rem ovalofflouride w as review ed. Several new m aterials for deflourination w ere recom m ended and their behaviorshave been com pared.
1999 Vol. 16 (5): 286-291 [Abstract] ( 2352 ) [HTML 0KB] [ PDF 0KB] ( 5 )
292 The Fractal Theory and its Applicationin Equation of State
Suo Xiaofang Ma Peisheng
In this paper,the concept of fractal theory w as introduced. Based on fractalstructure,a coordination num ber,a m olecular m ean potentialfunction and an equa tion of state( H S F T) w ere also introduced. Further,the application of H S F T w asdiscussed.
1999 Vol. 16 (5): 292-296 [Abstract] ( 1779 ) [HTML 0KB] [ PDF 0KB] ( 5 )
297 The Synthesis of N, N′┐ Bis(2,2,6,6┐ Tetram ethylpiperidinyl)┐1,6┐ Hexandiam ine
Chen Ligong Luo Huibing Li Yuan Li Yang Jiang Xiaosheng
The presentpaper is concerning the tw o step process forsynthesis of N, N′ bis(2,2,6,6 tetram ethylpiperidinyl) 1,6 hexandiam ine,being a lightstabilizer 944 in term ediary obtained from triacetonam ine and hexanam ine. The key step form m ing Schiffbase interm ediary w as investigated. Under optim un conditions including tem perature,catalyst and feed ratio,the yield oflight stabilizer 944 interm ediary is upto 76% .
1999 Vol. 16 (5): 297-299 [Abstract] ( 1972 ) [HTML 0KB] [ PDF 0KB] ( 6 )
300 Preparation of High Relative Molecular W eight Polyacrylam ide for Enhanced Oil Recovery
Zhang Qinglin
The high relative m olecular w eightpolyacrylam ide w as prepared by copolym er ization in aqueous solution using acrylam ide and sodium acrylate as raw m aterialsand a novel redox initiation system . The effects of reaction tem perature, theam ounts of initiator,m onom er concentration,m ole ratio of m onom ers and p H ofsystem on the relative m olecular w eightof the polym ers w ere studied and the opti m um reaction conditions w ere determ ined.
1999 Vol. 16 (5): 300-304 [Abstract] ( 2486 ) [HTML 0KB] [ PDF 0KB] ( 5 )
305 The Synthesis of Potassium Sulfate w ith Associationby W aste Sulfuric Acid
Li Guangjun Chen Baoliang Wei Zhigang
In this paper,a new technology of producing potassium sulfate w as studied. Itw as produced by w aste sulfuric acid of hebeiindustry from the point ofview ofen vironm ent. The optim um conditions oftechnology w ere obtained.
1999 Vol. 16 (5): 305-307 [Abstract] ( 1764 ) [HTML 0KB] [ PDF 0KB] ( 6 )
308 The Synthesis of Alkyl Polyglycoside of Hexadecyl
Deng Shuhau Cheng Xiaoling Song Xiaorui
The alkylpolyglycoside ofhexadecylw as synthesized by alcohol exchange gly cosidation m ethod. The process conditionsw ere investigated and recom m ened asfol low s:2# catalystw as choosed;its am ountby w eightis 0 8% ; the m olarratio ofn butanolto glucose is 6∶1 and hexdecylalcoholto glucose is 0 75∶1; the reactiontem perature is 110℃ and reaction tim e is 3 0h. The yield of A P G is m ore than85 97% .
1999 Vol. 16 (5): 308-311 [Abstract] ( 1866 ) [HTML 0KB] [ PDF 0KB] ( 5 )
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