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Table of Content
05 January 2009, Volume 28 Issue 1
    特约评述
    Choice of China’s energy and chemical industry in post-petroleum era
    CHEN Dingjiang,YU Yadong,HU Shanying,JIN Yong
    2009, 28(1):  1. 
    Abstract ( 2165 )  
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    China is under enormous pressure of huge energy consumption and carbon emission, however, it is reasonable for China’s further development even though the per capita amount is still increasing. Petroleum is mainly used as transportation fuel and fundamental chemical feedstock for a modern society. With the depletion of petroleum, the concept of sustainable development calls for a substitute for oil-dependent economy. This paper focuses on new ways of energy and chemical industry in the post-petroleum era to replace the traditional production process of transportation fuel and fundamental chemical feedstock, and puts forward some technical measures especially for China’s energy and chemical industry about how to face the dual challenge of energy consumption and carbon emission.
    化工过程与装备
    Several factors of CFD numerical simulation in stirred tank
    LI Bo,ZHANG Qingwen,HONG Housheng,YOU Tao
    2009, 28(1):  7. 
    Abstract ( 1685 )  
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    The progress of the research on CFD numerical simulation approaches for stirred tank reactors is reviewed, including the imposed impeller boundary condition method, the inner-outer approach, sliding mesh model, multiple frames of reference (MFR) and the snap shot approach method. According to the characteristics of the modeling methods, several main points, i.e., the presence of baffles, the capture of trailing vortex, the modeling of more complex impeller shapes, the choice of turbulence models, the effect of grid resolution and the difference of discretization schemes, are analyzed. Numerical simulation of stirred tank by using the computational fluid dynamics (CFD) approach is still under further study.
    Development of extraction technique based on chemical complexation for polar organic diluents separation
    LI Deliang,LIU Qing,CHANG Zhixian,ZHANG Zhijun
    2009, 28(1):  13. 
    Abstract ( 2112 )  
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    The separation technique of extraction based on reversible chemical complexation is of high efficiency and high selectivity for separating polar organic solutes in the dilute solution. The current applications of the extraction based on the reversible chemical complexation technique for the extraction of Lewis acid, Lewis alkali, the dilute solution of amphoteric organics, extraction kinetics and salt–out effect on extraction equilibrium from 2004 years are presented. The development and application of the extraction based on reversible chemical complexation are forecasted.
    Simulation of reactive distillation dividing wall column for synthesis of methyl acetate
    SUN Lanyi,YANG Delian,LI Jun,LI Qingsong
    2009, 28(1):  19. 
    Abstract ( 2331 )  
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    A novel single-column reactive distillation process was proposed for synthesis of methyl acetate, in which the reactive distillation dividing wall column was used instead of conventional reactive distillation column and methanol recovery column. Both the new process and conventional process were simulated with Aspen Plus. Liquid composition profiles of the two processes were compared. The influence of important parameters, such as the reflux ratio and vapor distribution ratio, on the performance of the novel process was studied. The results showed that energy consumption of the new process could be reduced by 11.9%, and the cost of equipment and operation would also be decreased.
    Experimental investigation on the heat dissipation effect of power battery pack cooled with phase change materials
    ZHANG Guoqing,RAO Zhonghao,WU Zhongjie,FU Lipeng
    2009, 28(1):  23. 
    Abstract ( 2386 )  
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    The heat dissipation effect of paraffin/graphite composite phase change materials (PCM) on power MH-Ni battery pack was investigated and the power cell and pack with phase change cooling function was also designed. Through monitoring the temperature rise of the battery at different discharge currents,the heat dissipation effects of the battery cooled with both PCM and air were compared. The optimization of mass ratio of the paraffin/graphite composite materials was also made by the experiment. Under 1C discharge process,the test results indicated that compared with natural and forced convection air cooled battery,the PCM cooled battery could decrease the temperature rises by 14~18℃ and 9~14℃ respectively. When the mass ratio of paraffin wax/graphite equaled 4∶1,the cooling effect was the best. The battery performance had no obvious decline before and after charge-discharge cycle of the PCM cooled power MH-Ni battery pack.
    Thermal characteristics of plate-type evaporative condenser
    LI Yuanxi,JIANG Xiang,ZHANG Jingwei,WANG Wei,ZHU Dongsheng
    2009, 28(1):  27. 
    Abstract ( 2270 )  
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    Experimental studies on major factors affecting thermal characteristics of the plate-type evaporative condenser,i.e.,air wet-bulb temperature,condensation temperature and relative moisture were conducted. The results showed that condensation temperature and condensation pressure increased with increasing inlet air wet-bulb temperature. Compressor power consumption was greatly affected by inlet air relative humidity and wet-bulb temperature. Comparisons based on the same vapor-compression refrigeration unit showed that the heat flux of the plate-type evaporative condenser was larger by 30.5% than the tube-type evaporative condenser when the condensation temperature was 38℃. The lower the inlet air wet-bulb temperature,the larger the difference between the heat stream density of the plate-type evaporative condenser and the tube-type evaporative condenser at the same condensation temperature.
    Numerical simulation of flow and heat transfer and structural optimization of dimple jackets
    FAN Qi,YIN Xia
    2009, 28(1):  31. 
    Abstract ( 2100 )  
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    Based on standard k-ε turbulent model in conjunction with the wall-surface function method,a three-dimensional numerical calculation of the fluid flow and heat transfer in dimple jackets was performed. A comparison of calculation results with test results showed that the error was less than 10%,indicating that the simulation model was reliable. The effects of geometrical parameters,such as cone angle,interval,height,diameter and arrangement of dimples on heat transfer performance of dimple jackets were investigated by adopting orthogonal design and factorial analysis,and structure parameters were optimized according to the response surface approach combined with variance analysis.
    Experimental study on viscosities of TiO2-H2O nanofluids
    HE Qinbo,TONG Mingwei,LIU Yudong
    2009, 28(1):  37. 
    Abstract ( 1703 )  
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    Four different concentration TiO2-H2O nanofluids with 20 nm TiO2 were prepared with supersonic oscillator through appending hydrophilic dispersant into deionized water. The viscosities of TiO2-H2O nanofluids and deionized water were measured at different temperatures. The results showed that the viscosities of nanofluids increased apparently compared to the deionized water. And the viscosities varied inversely with the temperature of the TiO2-H2O mixture system. The results also demonstrated that the TiO2-H2O nanofluids were Newtonian fluids.
    能源加工与技术
    Analysis of photobioreactor for hydrogen production by photosynthetic bacteria
    LI Gang,ZHANG Quanguo
    2009, 28(1):  41. 
    Abstract ( 2024 )  
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    Development of phtobioreactor is an essential stage in commercialization of hydrogen production by photosynthetic bacteria (PSB). The present status and the obstacles of photobioreactor for hydrogen production by PSB were presented. Using sunlight as the main light source and dispersed internal illumination are the pathways to conquer these obstacles and to develop large-scale photobioreactor.
    Progress and perspective of synthesis of ethylene glycol from syngas via oxalate
    ZHOU Jianfei,LIU Xiaoqin,LIU Dinghua
    2009, 28(1):  47. 
    Abstract ( 1800 )  
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    The synthesis technology of ethylene glycol from syngas via the procedure of oxalate is introduced. Primarily,the situation of the catalyst research and utilization of the oxalate synthesis as well as the hydrogenation stage is described. In addition,the application potential of the route employing oxalate as the intermediate is indicated.
    Progress of research on polyurea grease
    LIU Lei,SUN Hongwei
    2009, 28(1):  51. 
    Abstract ( 1780 )  
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    An introduction was made on the structure of polyurea thickener and property of polyurea grease,then the impact factors,such as base oil,thickening agents,additives,reaction operating conditions,after-treatment process for polyurea grease were analyzed by reviewing the latest research. Finally,the problem in this field and further work were presented.
    工业催化
    Progress of catalytic synthesis of naphthol
    ZHANG Tianyong,YANG Qiusheng,LU Zhou,LIU Xu,WANG Zhao,LI Xiaoxu
    2009, 28(1):  55. 
    Abstract ( 1796 )  
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    The recent developments in conventional synthesis of naphthol are summarized,including sulfonation alkali-fusion,via isopropyl naphthalene,hydrolysis,via tetrahydronaphthalene.The research progress of green synthesis of naphthol is reviewed,especially the reaction mechanism and technological process of bioengineering,direct catalytic synthesis.The application prospect of direct catalytic synthesis is also discussed.
    Research progress of catalytic oxidation synthesis of adipic acid using clean oxidant
    JING Shubo,ZHU Wanchun,GUAN Jingqi,WANG Guojia
    2009, 28(1):  62. 
    Abstract ( 1955 )  
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    The catalytic oxidation synthesis of adipic acid using clean oxidant,such as oxygen (or air) and hydrogen peroxide,were reviewed. The paper also introduced the new biological catalysis method for the production of adipic acid.
    Research status of dehydration of ethanol into ethylene over zeolite
    LI Yanan,JIN Zhaosheng,YANG Weimin
    2009, 28(1):  67. 
    Abstract ( 1897 )  
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    The research status and application progress of the use of zeolite as catalysts in ethanol dehydration to ethylene (ETO) is reviewed. Catalytic performance and demerit in ETO of different types of zeolite catalysts are compared. The application prospect and problems to be resolved are discussed. ZSM-5 is a potential catalyst in ETO.
    Research of solid acid catalyst in upgrading of bio-oil
    XU Junming,JIANG Jianchun,SUN Yunjuan,CHEN Jie
    2009, 28(1):  73. 
    Abstract ( 1733 )  
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    Recent researches of solid acid catalyst in the upgrading process for biomass pyrolysis oil (bio-oil) were reviewed. The advantages and shortcomings of several important solid acid catalyst,such as molecular sieve and SO42-/MxOy were analyzed and compared. It was pointed out that the currently used methods in upgrading bio-oil were catalytic pyrolysis and esterification. According to the properties of bio-oil,converting carboxyl acid and aldehyde through esterification and aldolization have great potential.
    Effect of acidity of solid acid catalysts on conversion of thiophene-type sulfide
    MO Tongpeng,HE Zhenfu,TIAN Huiping,CHEN Lin
    2009, 28(1):  78. 
    Abstract ( 1679 )  
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    The mechanism of sulfur conversion on different acidic zeolites were investigated with aromatic, olefin and thiophene as model compounds at 300℃, and 2.0 h-1 LHSV. The results showed that catalysts with different acidity type possessed different activities of sulfur conversion. The catalysts with both Broensted and Lewis acids showed better conversion of thiophene. Alkyl thiophene with longer and more chains tended to adsorb on the active sites. Acidity type influenced the components of model compounds. Catalysts with both Broensted and Lewis acids decreased the aromatic and olefin greatly,while catalysts with only Lewis acids converted aromatic greatly,but had little effect on olefin.
    材料科学与技术
    Suggestion on the industry of phosphorus chemicals
    FANG Weimao,GUO Xiaodong,YANG Hailan,ZHONG Benhe
    2009, 28(1):  82. 
    Abstract ( 1546 )  
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    The problems of phosphorus chemicals in China were discussed and some suggestions were made accordingly. Several key techniques in urgent need of improvement were presented by reviewing their present status and analyzing their potential significance.
    Advances in electrochemical synthesis of succinic acid
    SHEN Haiping,ZHAO Fengming,XU Yinghua,MA Chun’an
    2009, 28(1):  86. 
    Abstract ( 1897 )  
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    This paper reviews the research and development of electrochemical synthesis of succinic acid at home and abroad. The cathode materials,anode materials,electrolytic cells and membrane materials are introduced and their characteristics are summarized. Lead and its alloy are still adopted as cathode by industrial manufacture because of their favorable performance. The most suitable anode materials are ruthenium oxides based titanium or alloy of titanium. It is necessary to develop Ti or Ti/TiO2 electrodes and promote their application in the future.
    Progress of preparation and modification of monodisperse crosslinked polystyrene microspheres
    WANG Weiqiang,ZHANG Qiuyu,LIU Yanyan,MA Mingliang
    2009, 28(1):  93. 
    Abstract ( 2158 )  
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    Monodisperse microspheres have many advantages,such as large specific area,high surface reaction capability and so on. The latest preparation methods and applications of the monodisperse crosslinked polystyrene are reviewed. The prospective development of such functional materials is predicted.
    Advances in research and application of attapulgite
    FAN Guodong,SHEN Mao
    2009, 28(1):  99. 
    Abstract ( 2383 )  
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    Attapulgite is a kind of mineral with particular structure,characterisitcs and wide application. The paper reviews its mineral characteristics,modification mechanism and products application. It discusses the application and development prospect of attapulgite products in organic-inorganic composites and catalyst.
    Research progress of composite macromolecular flocculant of polysilicate ferric
    ZHANG Jingxiang,LU Jinren,SHAN Baotian
    2009, 28(1):  106. 
    Abstract ( 1965 )  
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    Polysilicate ferric coagulants are efficient composite flocculants,and have broad development prospects.This paper reviews the preparation,application,structure characterization and coagulation mechanism of polysilicate ferric coagulants and discusses the development trend.
    Progress of experimental techniques for kinetic measurement of absorption/desorption in metal hydride system
    YANG Fusheng,WANG Yuqi,MENG Xiangyu,HUA Lei,ZHANG Zaoxiao
    2009, 28(1):  110. 
    Abstract ( 1603 )  
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    Metal hydride is a kind of functional material widely used,which can reversibly absorb and desorb a large amount of hydrogen,and the reaction kinetics of the process has attracted many attentions. The paper reviews the various techniques commonly used in the kinetic measurement for metal hydrides,including volumetric method and thermal analysis method. Furthermore the production and elimination of the measurement errors are analyzed and the characteristics of the techniques are summarized,finally a forecast about the development of novel techniques is given.
    Antibacterial cellulose fiber grafted with quaternary ammonium salts by irradiation grafting
    XING Xiaodong,WANG Xiaogong
    2009, 28(1):  117. 
    Abstract ( 1884 )  
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    Surface contact disinfection technique is a newly developed method for water sterilization. In this process,the solid surface contact materials with antibacterial ability are used. The antibacterial performance will improve with the increase of antibacterial group on the surface of materials. A new type of antibacterial materials was prepared and designed to be used for surface contact disinfection process. The materials were prepared by grafting quaternary ammonium salts (QAS) onto cellulose fiber with direct irradiation grafting and pre-irradiation grafting methods. The factors,such as reaction time,temperature,monomer concentration,irradiation dose,which influenced the percentage of grafting in the grafting polymerization reactions,were studied and optimized. The modified cellulose fibers were characterized by FTIR and SEM. The results showed that the antibacterial cellulose fibers with a percentage of grafting above 55% were obtained by the pre-irradiation grafting method.
    Preparation of cellulose acetate micro porous membranes by supercritical CO2 phase inversion method
    SHI Yingjun,HE Gaohong,SHI Wenhua,ZHAO Wei,JU Jia,NIE Fei,QUAN Fugui
    2009, 28(1):  121. 
    Abstract ( 1953 )  
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    Micro porous cellulose acetate (CA) membranes were prepared by the supercritical CO2 phase inversion method using acetone and dimethyl formamide as solvents. The morphology of the membranes was characterized by scanning electron microscope (SEM) and the water flux of membranes was measured as well. The effect of affinity between solvent and CO2,CA concentration,CO2 pressure and temperature,holding pressure time and depressurization rate on the performance of the membrane was investigated. It was found that acetone was a suitable solvent for the preparation of the membrane with homogeneous structure. Moreover,the water flux of the membrane was reduced as the pore size decreased with increasing CA concentration. The water flux increased and reached a maximum value,then decreased with the increase of pressure as well as temperature. However,holding pressure time and depressurization rate had negligible influence on the water flux of the membrane. The membrane had a water flux as high as 30 L∙m-2∙min-1 when prepared with CA concentration of 10 %,15 MPa,45 ˚C,holding pressure time 45 min,and rapid depressurization rate.
    Transformation of cellulose to levulinic acid over SO42-/Al2O3-TiO2 catalyst
    WANG Chunying,WANG Pan,QI Xinhua,JIN Zhaohui,ZHUANG Yuanyi
    2009, 28(1):  126. 
    Abstract ( 1939 )  
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    Levulinic acid was prepared by solid SO42-/Al2O3-TiO2 catalyst from cellulose in water. The influence of the ratio Al2O3 to TiO2,impregnation concentration of sulfuric acid,and the calcination temperature on catalyst activity was studied,and the effect of reaction temperature,the mount of catalyst and liquid/solid ratio on the yield of levulinic acid was investigated. In the conditions of reaction temperature 220℃,reaction time 15 min,the mount of catalyst 0.6 g and ratio of liquid to solid 20∶1,a levulinic acid yield of 19.34% was obtainted.
    Preparation of 4A zeolite molecular sieve from Xuzhou coal-measure kaolin
    WU Qisheng,LI Shuiping,SU Shasha
    2009, 28(1):  130. 
    Abstract ( 1707 )  
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    The 4A zeolite molecular sieve [Na12 (Al12Si12O48) ·27H2O] was synthesized in a sealed Teflon lined autoclave by hydrothermal reaction of NaOH solution and metakaolinite (the mass ratio of solid/liquid is 1∶20) prepared by calcined coal-measure kaolin from Xuzhou at 550℃ for 2h. 4A zeolite molecular sieve was characterized by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM) and N2 adsorption and desorption isotherm plot methods. The results indicated that amorphous anhydrous metakaolinite was obtained by calcination of kaolin at 550℃ for 2h; it was transformed to 4A zeolite molecular sieve by alkali leaching; the best concentration of NaOH solution was 2mol/L; the pore channel of 4A zeolite molecular sieve was long and narrow,but its shape and size were not uniform.

    生物化工
    Coupled procedure of SOD purification and modification
    LI Donghua,WANG Hong,SUN Handong,YI Yu,YING Guoqing
    2009, 28(1):  135. 
    Abstract ( 2045 )  
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    In this paper,superoxide dismutase (SOD) was used as a template,and purification and modification were coupled to obtain more stable modified SOD with higher activity. SOD was mixed with DEAE-52 and Cu2+ chelating-sephadex G-75 without being washed immediately but modified by activated PEG5000 upon that solid-phase column,then washed specifically. The modification and purification of SOD were completed at the same time. Finally,the specific activity of PEG-SOD after IEC-modification was 9638.0 U/mg,with a purification factor of 1.87. It was modified at 35.3% of its free amino groups. And the specific activity of PEG-SOD after MCAC-modification was 9067.8 U/mg,with a purification factor of 1.755. It was modified at 40.9% of its free amino groups,retained 87.1% of enzymatic activity of native SOD. It is feasible to couple the purification and modification of SOD.And the coupling of MCAC and modification was better than this of IEC and modification.
    Isolation of trans-anethole degrading bacterial strains and biotransformation of trans-anethole
    SU Guijiao,LIU Xiongmin,ZHU Ping,CHEN Min,MO Qihong
    2009, 28(1):  141. 
    Abstract ( 2475 )  
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    Anise oil is a natural spice in Guangxi. Isolation of trans-anethole degrading bacterial strains and trans-anethole biotransformation process were performed using anise oil as the only carbon source. The target strains were expected to produce high value-added nature spice and medicine intermediate by biotransformation of trans-anethole—the main constituent of anise oil. Bacteria were isolated from soil under aniseed trees by enrichment culture. Then biotransformation of trans-anethole to anisaldehyde or anisic acid with these strains were carried out by fermentation. The contents of trans-anethole,anisaldehyde and anisic acid in the culture broth were analyzed by the methods of TLC,photometry and HPLC determined. The isolated bacterial strain BT-13 had good capability to biotransform trans-anethole to anisic acid. This strain was identified as Pseudomonas sp. according to visual observation,physiological and biochemical experiments and 16S rDNA sequence analysis.
    Separation and purifcation of shikimic acid from Picea meyeri with ion exchange resin
    YANG Lei,LIU Yu,ZHANG Lin,ZU Yuangang
    2009, 28(1):  145. 
    Abstract ( 1807 )  
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    The process parameters of the separation and purification of shikimic acid from Picea meyeri with ion exchange resin were established. Eight different kinds of ion exchange resins named D261,D296,D301-R,D301-G,D290,201*7(717),D201 and D280 were studied and the static capacity of adsorption and desorption with shikimic acidcwas investigated. The better resin was D290. The optimum adsorption and desorption parameters of separation and purification shikimic acid with resin D290 were as follows,adsorption:pH 6,25℃,flow rate 3 mL/min; desorption:eluent 2.5% NaOH aqueous solution,flow rate 3 mL/min. After treating with D290,the yield of shikimic acid was 92.53%,and the purity increased from 2.97% to 46.74%. 15.74 times as high as the crude extract. The results showed that resin D290 had good ability of separation and purification of shikimic acid.
    精细化工
    Progress and development trend of ethyl lactate synthesis
    HUANG Zhihong,GAO Jing,ZHOU Liya,HE Ying,LI Weijie
    2009, 28(1):  150. 
    Abstract ( 1768 )  
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    Ethyl lactate is nontoxic,biodegradable,and has excellent solvent properties that can replace toxic and halogenated solvents for a wide range of industrial applications and consumer uses as a “green solvent”. The progress of preparation of ethyl lactate through chemical and bio-chemical methods from lactic acid and ammonium lactate is described in this paper. The advantage and disadvantage of synthesis of ethyl lactate from different raw materials and by different methods are discussed. The future research work of the synthesis of ethyl lactate is proposed.
    Optimization of synthesis of 2-mercapto benzothiazole with response surface methodology
    LIU Ruijiang,WANG Hua,ZHANG Yewang,LU Shirong,ZHOU Heda
    2009, 28(1):  155. 
    Abstract ( 1725 )  
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    Synthesis conditions of 2-mercapto benzothiazole by reacting aniline with carbon disulfide and sulfur were optimized with single factor optimization and response surface methodology (RSM). Based on the results of single factor optimization,optimal stirring mode and catalysts were obtained,and the effects of such factors as temperature rise rate,heat holding time and substrate ratio were studied with RSM. A mathematic model of yield for 2-mercapto benzothiazole was established,and the best conditions were obtained:high temperature,high pressure and no stirring,salicylic acid as catalyst,and the mass of salicylic acid 5% of aniline,substrates mole ratio of aniline:sulfur:carbon disulfide = 1∶1.05∶1.11,temperature rise rate 1.93℃/min,reaction time 2.0h. The maximum yield was 92.08% under the optimal conditions,reaction time was shortened to 1.0h,temperature rise rate was reduced by 0.77℃/min,and the yield was improved by 6.2%.
    资源与环境工程
    Preparation of compound desulphurization agent and study on its removal of SO2
    ZHANG Ting,YU Shurong,FENG Huixia,WANG Yi
    2009, 28(1):  159. 
    Abstract ( 1989 )  
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    A kind of new desulphurization agent,a composite desulphurization adsorbent made of the mixture of γ-Al2O3 and attapulgite (ATTP) and some additives,and coated with transition metal oxide (CuO),was studied. According to the experiments,the influences of ATTP content,baking temperature,the concentration of Cu(NO3)2 and water content of the desulphurization agent on the removal of SO2 were discussed. When ATTP content was 60%,baking temperature was about 600~700 ℃,concentration of Cu(NO3)2 was about 15% and the water content of the desulphurization agent was 15%~30%,the desulphurization adsorbent had good adsorptivity and good ability of catalytic desulphurization,and its maxmium sulfur tolerance was about 17%.
    应用技术
    Novel adsorbent for removal of sec-butanol from recycle butylenes in MEK unit
    WANG Weiran,ZHANG Wenhui,CHEN Guangxu,XU Chunming,GAO Jinsen
    2009, 28(1):  163. 
    Abstract ( 1755 )  
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    Side-stream experiment for the removal of sec-butanol (SBA) from recycle butylenes by adsorption on adsorbent PUMS-01 was carried out in a methyl ethyl ketone unit. The content of SBA in butylenes decreased from 0.5%~2.5% to below 100 μg/g after adsorption at atmospheric temperature,reaction pressure of 0.5 MPa and space velocity of 0.2 h-1. The adsorbent PUMS-01 had good adsorption capability. Economic evaluation showed that the adsorption process had the advantage of low investment and high economic returns.
    Development of DHT-1 hydrorefining catalysts for diesel hydrodewaxing technics
    LI Fengxuan,GUO Jintao,WU Xianjun,FANG Lei,XIA Endong
    2009, 28(1):  168. 
    Abstract ( 1687 )  
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    The DHT-1 hydrorefining catalysts for diesel oil hydrogenation based on γ-Al2O3 modified by carbon black is introduced. The envaluation results showed that its hydrogenation activity was a little better than the reference catalyst. When combining it with a kind of hydrodewaxing catalyst for processing Daqing diesel oil,the tests results showed that the yield of diesel fuel was more than 93.0 wt%,the sulfur content was lower than 50.0µg/g,the freezing point was lower by 19.2℃,and the cetane number increased by 1.0 to 3.4. All of these show that the DHT-1 catalyst can be well matched with the hydrodewaxing catalysts.
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