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CONTROLLED/"LIVING" RADICAL POLYMERIZATION OF STYRENE IN AN AQUEOUS DISPERSION SYSTEM

Chinese Journal of Polymer science 2002年第5期20卷 445-451页

作者： Bin Zhang Zhao-bin Zhang Xiao-long Wan Chun-pu Hu Sheng-kang Ying Lab of Living Polymerization, east china university of science and technology.shanghai 200237,china E china Univ Sci & Technol Lab Living Polymerizat Shanghai 200237 Peoples R China

Atom transfer radical polymerization (ATRP) of styrene catalyzed by cuprous (CuX)/1,10-phenanthroline (Phen) and CuX/CuX2/Phen was conducted in an aqueous dispersed system. A stable latex was obtained by using ionic surfactant sodium lauryl sulfonate (SLS) or composite surfactants, such as SLS/polyoxyethylene nonyl phenyl ether (OP-10), SLS/hexadecanol and SLS/OP-10/hexadecanol, Among which SLS and SLS/OP-10/hexadecanol systems established better dispersed effect during the polymerization, It was found that Phen was a more suitable ligand than N,N,N',N',N'-pentamethyldiethylenetriamine (PMDETA) to maintain an appropriate equilibrium of the activator Cu(I) and the deactivator Cu(II) between the organic phase and the water phase, The effect of several initiators (such as EBiB, CCl4 and 1-PEBr) and the temperature on such a kind of ATRP system was also observed. The number-average molar mass (M-n) of polystyrene (PS) increased with the conversion and the molar mass distribution (M-w/M-n) remained narrow. These experimental data show that the polymerization could be controlled except for the quick increase of monomer conversion and the number-average molar mass of PS in the initial stage of polymerization. Furthermore, the initiator efficiency was found to be low (similar to57%) in CuX/Phen catalyzed system. To overcome this problem, Cu(II)X-2 (20 mol%-50 mol% based on CuX) was introduced into the polymerization system. In this case, higher initiator efficiency (60%-90%), low M-w/M-n of PS (as low as 1.08) were achieved and the molar masses of the PS fit with the theoretical ones.

关键词： controlled/'living' radical polymerization polystyrene water dispersed polymerization 1,10-Phenanthroline

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Study on Activated Bentonite Applied to tert-Butylation of Toluene

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china Petroleum Processing & Petrochemical technology 2011年第1期13卷 38-44页

作者： Chen Linbo Shi Li (Department of Petroleum Processing,east china university of science and technology.shanghai 200237) E china Univ Sci & Technol Dept Petr Proc Shanghai 200237 Peoples R China

tert-Butylation of toluene with tert-butanol used as the alkylating agent was investigated over the activated bentonite and HY zeolite used as the *** influences of various butylation reaction parameters,including the toluene/tert-butanol ratio,the reaction temperature,and the space velocity were *** optimal results were obtained at a reaction temperature of 180 ℃,a space velocity of 4 h-1,and a mole ratio of toluene to tert-butanol equating to *** structure and acidic properties of catalyst were characterized by the BET method and the Fourier transform infrared (FTIR) *** with the HY zeolite,the activated bentonite possessed high activity for toluene conversion and high para-selectivity because it had larger pore diameter,smaller micropore surface area and higher ratio of total Lewis acids to total Br nsted acids.

关键词： t-butylation activated bentonite p-tert-butyltoluene pore diameter Lewis acid

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The Preparation and Application of two New Types of Oxazaborolidines

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Chinese Chemical Letters 2000年第5期11卷 381-382页

作者： Guo Bin RONG Xing Ming LI Yong ZHANG (Department of Chemistry east china university of science and technology. shanghai 200237) E china Univ Sci & Technol Dept Chem Shanghai 200237 Peoples R China

Two new type of 1,3,2-oxazaborolidines were prepared from (Is,2s)-2-amino-1-(4-nitrophenyl)-propane-1-3-diol and were used as catalyst in the asymmetric reduction of acetophenone. The influence of the reaction temperature as well as the effect of the structure of catalyst on the enantioselectivity was investigated. The origin of the products' configuration was discussed.

关键词： oxazaborolidine asymmetric catalytic reduction prochiral ketone

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Removal of Trace Olefins from Aromatics by Catalytic Alkylation Using 1-Alkyl-3-methylimidazolium Bromochloroaluminate Catalyst

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china Petroleum Processing & Petrochemical technology 2011年第2期13卷 14-18页

作者： Sun Yu Shi Li(State Key Laboratory of Chemical Engineering,east china university of science and technology.shanghai 200237) E china Univ Sci & Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China

Removal of trace olefins from aromatic liquids had been investigated in the presence of various ionic liquids like 1-ethyl-3-methylimidazoliurn bromochloroaluminate （EMIMBr-AlCl3）, 1-butyl-3-methylimidazolium bromochloroaluminate （BMIMBr-AlCl3）, l-hexyl-3-methylimidazolium bromochloroaluminate （HMIMBr-AlCl3）, and 1-octyl-3-methylimidazolium bromochloroaluminate （OMIMBr-A1C13）. It was found that the longer the alkyl chain of ionic liquid cations was, the higher the olefins conversion would be. OMIMBr-AlCl3 （with 0.67 molar fraction of AlCl3） had an obvious performance on olefins removal. The influences of various reaction parameters such as the dosage of catalyst, the reaction temperature, and the reaction time on the reaction catalyzed by OMIMBr-AlCl3 were investigated. Under optimum reaction conditions, a higher than 99% conversion of olefins was achieved. The preliminary results revealed that the process could save time, consume less energy, separate products easier, and cause less pollution to the environment.

关键词： ionic liquids olefins removal 1-alkyl-3-methylimidazolium bromochloroaluminate aromatic

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A NOTE ON THE DIPERNA-LIONS FLOWS

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Acta Mathematica Scientia 2011年第5期31卷 1719-1724页

作者：刘昕黄文亮 School of Computer science and technology Huazhong University of Science and Technology Department of Mathematics East China University of Science and Technology

In this note, we give a short proof for the DiPerna-Lions flows associated to ODEs following the method of Crippa and De Lellis [3]. More precisely, assume that [divb] ∈ Ll∞oc（Rd）, ｜b｜/（1 ＋｜x｜ log ｜x｜） ∈ L∞（Rd） and ｜ b｜ φ（｜ b｜） ∈ Ll1oc（Rd）, where φ（r） = log log（r ＋ c）, c 0. Then, there exists a unique regular Lagrangian flow associated with the ODE X˙（t, x） = b（X（t, x））, X（0, x） = x.

关键词： DiPerna-Lions flow Hardy-Littlewood maximal function

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Fusion Protein of Interleukin 4 and Diphtherial Toxin with High Cytotoxicity to Cancer Cells

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Acta Biochimica et Biophysica Sinica 2004年第6期36卷 437-442页

作者： Yu-Jian ZHANG, Xiao-BoHU, Su-Xia LI1, Li-Ping TIAN, Sheng-Li YANG, and Yi GONG* Research Center of Biotechnology, shanghai Institutes for Biological sciences,Chinese Academy of sciences, Graduate School of the Chinese Academy of sciences, shanghai 200233, china State Key Laboratory of Bioreactor Engineering, east china university of science and technology, shanghai 200237, china Research Center of Biotechnology Shanghai Institutes for Biological SciencesChinese Academy of Sciences Graduate School of the Chinese Academy of SciencesShanghai 200233 China State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237 China

Receptor of human interleukin 4 (hIL4R) has been found to be present on many types of cancer, so it may be a good target for cancer therapy. Here, fusion toxin gene DT4H has been constructed by fusing DNA sequence encoding the first 389 amino acids of diphtherial toxin (DT), which can not bind its own receptor, to human interleukin 4 (hIL4) gene. In order to improve the affinity of fusion toxin for hIL4R, a circularly permuted form of hIL4 (cpIL4) was used. The fusion gene was expressed in Escherichia coli where the fusion toxin DT4H was highly expressed. Purified DT4H was very cytotoxic to cancer cell line U251 cells, and moderate cytotoxic to HepG2 and MCF-7 cells. SGC-7901 cells were insensitive to it. The cytotoxic action of DT4H was specific because it was blocked by excess hIL4. These results suggest that DT4H may be a useful agent in the treatment of certain malignancies.

关键词： fusion toxin diphtherial toxin cancer therapy interleukin 4 IL-4 receptor

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Ni-loaded Catalyst Containing Activated Clay for Maleic Anhydride Hydrogenation to Succinic Anhydride

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china Petroleum Processing & Petrochemical technology 2011年第4期13卷 35-40页

作者： Tian Weiping Guo Shaofei Shi Li (The State Key Laboratory of Chemical Engineering, east china university of science and technology, shanghai 200237) E china Univ Sci & Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China

In this work, the hydrogenation of maleic anhydride to succinic anhydride in the presence of 5 m%Ni/clay catalysts was investigated. These catalysts were characterized by X-ray diffraction （XRD）, H2 temperature programmed reduction （TPR） and thermogravimetric analysis （TGA） techniques. The XRD and TPR studies showed that Ni was present as Ni2＋ on the support, which indicated that there were no elemental nickel （Ni^0） and Ni203 species in the unreduced samples. Increasing of calcination temperature to 650 ℃ leads to destruction of the support structure observed in TGA, while the catalyst sample calcined at 550 ℃ exhibits better performances than other samples. The ideal conversion of maleic anhydride （97.14%） and selectivity of succinic anhydride （99.55%） were realized at a reaction temperature of 180 ℃ and a weight hourly space velocity of 4 h^-1 under a reaction pressure of 1 MPa.

关键词： maleic anhydride hydrogenation succinic anhydride nickel

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Study on Removal of Naphthenic Acids from White Oil by[BMIM]Br-AlCl_3

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china Petroleum Processing & Petrochemical technology 2010年第4期12卷 46-51页

作者： Li Jing Sun Yu Shi Li (The State Key Laboratory of Chemical Engineering,east china university of science and technology, shanghai 200237) E china Univ Sci & Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China

The removal of acid compounds （naphthenates） from acidic oil with ionic liquids was systematically investigated. [BMIM]Br-AlCl3 was used to investigate the effect on deacidification of oil. Experimental results showed that at a temperature of 323K with a molar ratio of AlCl3 to [BM1M]Br-AlCl3 of 0.2, and a mass ratio of IL to white oil of 4%, the deacidification rate could reach 75.9%. And a reaction time of 4 h was sufficient to achieve the goal. The study on reproducibility of catalytic performance of [BMIM]Br-AlCl3 showed the possibility of using the ionic liquid in the continuous catalytic reaction.

关键词： naphthenic acid ionic liquid white oil deacidification

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θ-PSO: a new strategy of particle swarm optimization

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Journal of Zhejiang university-science A(Applied Physics & Engineering) 2008年第6期9卷 786-790页

作者： Wei-min ZHONG1,2, Shao-jun LI1,2, Feng QIAN1,2 (1State Key Laboratory of Chemical Engineering, east china university of science and technology, shanghai 200237, china) (2Automation Institute, east china university of science and technology, shanghai 200237, china) State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China Automation Institute East China University of Science and Technology Shanghai China

Particle swarm optimization (PSO) is an efficient, robust and simple optimization algorithm. Most studies are mainly concentrated on better understanding of the standard PSO control parameters, such as acceleration coefficients, etc. In this paper, a more simple strategy of PSO algorithm called θ-PSO is proposed. In θ-PSO, an increment of phase angle vector replaces the increment of velocity vector and the positions are decided by the mapping of phase angles. Benchmark testing of nonlinear func- tions is described and the results show that the performance of θ-PSO is much more effective than that of the standard PSO.

关键词： Particle swarm optimization (PSO) Phase angle Benchmark function

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Study on Desulfurization with Ionic Liquid [BMIM]PF_6

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china Petroleum Processing & Petrochemical technology 2009年第4期11卷 34-37页

作者： Qiao Dongjun Li Jing Shi Li (The State Key Laboratory of Chemical Engineering,east china university of science and technology, shanghai 200237) State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

The removal of sulfur compounds(thiophene) from petroleum via extraction with ionic liquids was systematically *** ionic liquid[BMIM][PF_6]([BMIM]^+—1-butyl-3-methylimidazolium hexatiuorophosphate cation) was used to investigate its effect on thiophene *** test results showed that a higher temperature and a greater mass ratio of the ionic liquids versus the oil containing the sulfur compounds both helped to remove the thiophene from the feed *** a temperature of 60℃and an ionic liquid/feed oil mass ratio of 20%,the desulfurization rate could reach 52.39%, with the extraction time specified at 40 minutes.

关键词： [BMIM][PF_6] ionic liquid thiophene desulphurization

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