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Study on design pressure of in-service welding pipes

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Science china(Technological Sciences) 2006年第4期49卷 434-444页

作者： XUE Xiaolong1, ZHU Jiagui2.& SANG Zhifu1 1. College of Mechanical and Power Engineering, Nanjing University of technology, Nanjing 2.0009, china 2. Nanjing Yangzi {2. Maintenance and Installation Co. Ltd., Nanjing 2.0048, china College of Mechanical and Power Engineering Nanjing University of Technology Nanjing China Nanjing Yangzi petrochemical Maintenance and Installation Co. Ltd. Nanjing China

A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be concluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be considered adequately to determine operating condition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Accord- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved.

关键词： in-service welding, heat input, flow rate, pipe wall thickness, design pressure.

Development of Hydrocracking Catalyst to Produce High Quality Clean Middle Distillates

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china Petroleum Processing & petrochemical {2. 2004年第4期6卷 19-23页

作者： Zhang Xuejun 1,2.Zhang Zhihua1,2.1. institute of Daqing petrochemical Company, Daqing 163714 2. School of Chemistry & Chemical Engineering, University of Petroleum,Dongying 2.7061) Inst. of Daqing Petrochem. Company Daqing 163714 China Sch. of Chem. and Chem. Engineering University of Petroleum Dongying 257061 China

A novel hydrocracking Ni-W binary catalyst was tentatively designed and prepared by means ofimpregnation on mixed supports of modified Y zeolite and amorphous aluminosilicate . The structure andproperties of catalyst were extensively characterized by XRD, NH3-TPD, IR and XRF techniques. The perfor-mance of catalyst was evaluated by a 100-ml hydrogenation laboratory test unit with two single-stage fixed-bedreactors connected in series. The characterization results showed that the catalyst has a developed and con-centrated mesopores distribution, suitable acid sites and acid strength distribution, and uniform and highdispersion of metal sites. Under a high conversion rate of 73.8% with the >350℃ feedstock, a 98.1m% of C5+yield and 83.5% of middle distillates selectivity were obtained. The yield of middle distillates boiling between140℃and 370℃ was 68.70m% and its quality could meet the WWFC category III specification. It means thatthis catalyst could be used to produce more high quality clean middle distillates derived from heavy oilhydrocracking. The potential aromatic content of heavy naphtha from 65℃ to 140℃ was 37.5m%. The BMCIvalue of >370℃ tail oil was 6.6. The heavy naphtha and tail oil are premium feedstocks for catalytic reformingand steam cracker units.

关键词： hydrocracking Ni-W binary catalyst clean middle distillate WWFC categoryIII specification

Investigation of ZSM-5/MCM-41 Composite Molecular Sieve for Reducing Olefin Content of FCC Gasoline

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china Petroleum Processing & petrochemical {2. 2009年第4期11卷 10-17页

作者： Ji Dekun~(1,2. Li Shuyuan~1 Ding Fuchen~2.Chi Yaoling~2.(1.Chemical Engineering School,china University of Petroleum(Beijing),Beijing 102.49 2.Department of Chemical Engineering,Beijing institute of {2. technology) Chemical Engineering School China University of Petroleum (Beijing) Beijing 102249 China Department of Chemical Engineering Beijing Institute of Petrochemical Technology China

ZSM-5/MCM-41 composite molecular sieve was prepared by the nano-assembling *** ZSM-5 molecular sieve,the MCM-41 molecular sieve,the ZSM-5/MCM-41 mechanical mixture and the ZSM-5/MCM-41 composite molecular sieve were characterized by X-ray powder diffractometry,N_2.adsorption isotherms,temperature programmed desorption of ammonia and scanning electron microscopy and their properties were *** FCC gasoline as the feed,activities of different molecular sieves for reducing olefin content were investigated in a continuous high-pressure micro-reactor unit under the following conditions:a reaction temperature of 400℃,a reaction time of 2.h,a weight hourly space velocity of 3h^(-1),and a reaction pressure of 2.0 *** results showed that the HMCM-41 molecular sieve had low reaction performance,and the HZSM-5 molecular sieve demonstrated high aromatization activity,while the ZSM-5/MCM- 41 composite molecular sieve exhibited a best olefin-reducing performance because of its high isomerization activity and moderate aromatization *** a largest olefin-reducmg capability and a reasonable distribution of products,the composite molecular sieve was more suitable for FCC gasoline upgrading compared to other three catalysts.

关键词： ZSM-5 MCM-41 composite molecular sieve FCC gasoline olefin reduction

Preparation,characterization,and catalytic performance of a novel methyl-rich Ti-HMS mesoporous molecular sieve with high hydrophobicity

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Science china Chemistry 2010年第6期53卷 1337-1345页

作者： LI XueFeng1,XU ZhiHong1,GAO HuanXin2.& CHEN QingLing2.1College of Chemistry and Chemical Engineering,Xuchang University,Xuchang 461000,china 2.hanghai Research institute of {2. technology,Shanghai 2.12.8,china College of Chemistry and Chemical Engineering Xuchang University Xuchang China Shanghai Research institute of petrochemical {2. Shanghai China

A novel methyl-rich Ti-containing hexagonal mesoporous silica (Ti-HMS) molecular sieve with high hydrophobicity has been prepared by a two-step method involving co-condensation followed by vapor-phase methyl *** sample was characterized by XRD,N2.adsorption,FTIR,UV-visible and 2.Si NMR spectroscopies,TG,ICP-AES,and hydrophilicity measurements,and its catalytic performance was evaluated using the epoxidation of cyclohexene as a probe *** Ti-HMS material retains a typical mesoporous structure and compared with a co-condensed Ti-HMS prepared in a one-step method possesses more methyl groups and higher hydrophobicity,and also exhibits better catalytic activity and selectivity.

关键词： two-step methyl grafting high hydrophobicity methyl-rich Ti-HMS epoxidation of cyclohexene

Adsorptive desulfurization on a heteroatoms Y zeolite prepared by secondary synthesis

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Science china Chemistry 2010年第1期53卷 281-286页

作者： TANG Ke1,HONG Xin1,ZHAO YongHua1,SONG LiJuan2.& SUN ZhaoLin2.1School of Material and Chemical Engineering,Liaoning institute of technology,Jinzhou 12.001,{2. 2.ollege of petrochemical Engineering,Liaoning University of Petroleum & Chemical technology,Fushun 113001,{2. School of Material and Chemical Engineering Liaoning Institute of Technology Jinzhou China College of petrochemical Engineering Liaoning University of Petroleum & Chemical Technology Fushun China

Gallium atoms have been introduced into the framework of Y zeolite by treating the zeolite with an aqueous solution of ammonium hexafluoro *** of various model fuels containing about 500 μg/g sulfur has been studied over the synthesized Y zeolite(GaAlY).The sulfur adsorption capacity is 7.0,17.4,14.5,16.9,6.9 and 5.8 mg(S)/g adsorbent for thiophene,tetrahydrothiophene(THT),4,6-dimethyldibenzothiophene(4,6-DMDBT),dibenzophiophene(DBT),benzothiophene(BT) and 4-methyldibenzothiophene(4-MDBT),*** charges on the S atom in thiophene,THT,4,6DMDBT,DBT,BT and 4-MDBT,calculated using the density functional theory(DFT),are-0.159,-0.2.8,-0.2.4,-0.2.1,-0.193 and-0.188,respectively,implying that the S-M bond between the adsorption sites and thiophene is much weaker than that between the adsorption sites and THT,4,6-DMDBT or *** sulfur removal of FCC gasoline on GaAlY is 68%.

关键词： isomorphous substitution DFT model fuels adsorptive desulfurization

Study on Modified Y Zeolites and Their Behaviors in Selective Adsorptive Desulfurization of FCC Gasoline (Ⅰ)

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china Petroleum Processing & petrochemical {2. 2009年第4期11卷 18-22页

作者： Zhu Heli~(1,2. Liu Daosheng~2.Song Lijuan~2.Sun Zhaolin~2.(1.Petrochina Jinxi petrochemical Company,Huludao 12.001 2.Liaoning Key Laboratory of petrochemical Engineering,Liaoning University of Petroleum and Chemical technology) Petrochina Jinxi petrochemical Company Huludao 125001 China Liaoning Key Laboratory of petrochemical Engineering Liaoning University of Petroleum and Chemical Technology China

NaY zeolite was modified through dealumination with oxalic acid,and the HY zeolite was obtained by calcination of the modified NaY *** zeolite molding process was carried out at ambient temperature(2.℃),and the influence of solid/fuel mass ratio and adsorptive desulfurization time on the HY zeolite were investigated through tests on static selective adsorptive desulfurization of FCC gasoline containing organic sulfur compounds(with a S content=135 ppm).The sulfur content and sulphide types in the FCC gasoline were analyzed by a GC 2.10 sulfur analyzer and a GC-SCD *** test results showed that the molded HY zeolite was better than the unmolded HY *** a static adsorptive desulfurization time on the molded HY zeolite equating to 6 hours,a solid/fuel mass ratio of 1:3,the sulfur content of FCC gasoline was decreased to 30 ppm,and the desulfurization rate was equal to 78%.When the breakthrough point of the molded HY was equal to 50 ppm,the molded HY zeolite was capable of adsorbing 4.86 mg of sulfur per gram of *** the regeneration rate of molded HY zeolite was equal to 98%.

关键词： dealumination zeolite FCC gasoline adsorptive desulfurization

Study on Laboratory Method for Refining of SR Diesel Fuel

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china Petroleum Processing & petrochemical {2. 2006年第3期8卷 57-60页

作者： Li Junling1 Zheng Tinglu2.Han Zhaping3 (1. College of Chemistry and Chemical Engineering, china Petroleum University (East china) Dongying 2.7061 2. Shandong Jingbo {2. Co. 3. Shandong Donghai {2. Co.) College of Chemistry and Chemical Engineering China Petroleum University (East China) Dongying 257061 China Shandong Jingbo petrochemical Co. China Shandong Donghai petrochemical Co. China

The method for refining the straight-run diesel fuel was studied in laboratory scale in order to make the acid number of diesel fraction comply with the standard while removing the naphthenic acids contained in diesel without causing environmental pollution. After comparing the effect of refining using three solvents, the isopropyl alcohol-HOA was specified as the best solvent. Meanwhile, the relationship between the acid number of diesel fraction and the amount of solvent used and the relationship between the concentration of solvent and temperature and the stability of diesel in terms of its acid number were also investigated. Experimental results had shown that when the mass fraction of the HOA-IPA solvent was 2.% at a dosage of 17 mL of the solvent and a temperature of 30℃, the acid number of the refined diesel fraction was 0.015 mg KOH/g with a good stability of acidity in the diesel fraction.

关键词： straight-run diesel deacidification refining naphthenic acid

Adsorption and Desorption of Thiophene Vapor on NaY/NiY Zeolites

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china Petroleum Processing & petrochemical {2. 2010年第2期12卷 45-50页

作者： Liu Daosheng~(1,2. Song Lijuan~2.Ju Xiufang~2.Duan Linhai~2.Sun Zhaolin~(1,2. (1.College of Chemistry & Chemical Engineering,china University of Petroleum(East china),Dongying 2.7061 2.Liaoning Key Laboratory of {2. Engineering,Liaoning Shihua University) College of Chemistry and Chemical Engineering China University of Petroleum (East China) Dongying 257061 China Liaoning Key Laboratory of petrochemical Engineering Liaoning Shihua University China

FT-IR spectrometry, TPD and adsorption isotherms of thiophene on NaY/NiY zeolites were carried out and the diffusion coefficient was obtained by means of its real-time dynamic curves. The loading of thiophene adsorbed on the NaY zeolite decreased with an increasing temperature, which was ascribed to the patterns of physical adsorption. Both physical and chemical adsorption phenomena were detected on the NiY zeolite, with the 0 complexation and S-M interaction existing during the chemical adsorption. The loading of thiophene adsorbed on the NiY zeolite at 302.K and 335 K was equal, but it decreased at 373 K. The diffusion coefficient of thiophene on the NaY zeolite decreased when the loading increased to more than 0.02.mmol/g, and on the contrary that of thiophene on the NiY zeolite did not change obviously with the loading adsorbed.

关键词： adsorption diffusion coefficient temperature-programmed desorption (TPD)

Corrosion resistance properties of AZ31 magnesium alloy after Ti ion implantation

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Rare Metals 2007年第2期26卷 142-146页

作者： CHEN Fei ZHOU Hai CAI Suo LV Fanxiu LI Chengming College of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

Magnesium alloys have a wide range of applications in industry; however, their corrosion resistance, wear resistance, and hardness are rather poor, which limit their applications. Ti ion was implanted into the AZ31 magnesium alloy surface by metal vapor vacuum arc （MEVVA） implanter. This metal arc ion source has a broad beam and high current capabilities. The implantation energy was fixed at 45 keV and the dose was at 9×10^17 cm^-2. Through ion implantation, Ti ion implantation layer with approximately 900 um in thickness was directly formed on the surface of AZ31 magnesium alloy, by which its surface property greatly improved. The chemical states of some typical elements of the ion implantation layer were analyzed by means of X-ray photoelectron spectroscopy （XPS）, while the cross sectional morphology of the ion implantation layer and the phase structure were observed by means of scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The property of corrosion resistance of the Ti ion implanted layer was studied by the CS300P electrochemistry corrosion workstation in 3.5% NaCl solution. The results showed that the property of corrosion resistance was enhanced remarkably, while the corrosion velocity was obviously slowed down.

关键词： magnesium alloy ion implantation component distribution corrosion resistance