Zheng Z.-W.,Xiamen University |
Shi D.-P.,Xiamen University |
Su P.-L.,Xiamen University |
Luo Z.-H.,Xiamen University |
Li X.-J.,Lanzhou Petrochemical Company
Industrial and Engineering Chemistry Research | Year: 2011
In this work, we developed the steady-state and dynamic models for the commercial polypropylene process of Basell Spheripol technology, involving fundamental chemical engineering principles and advanced software tools, i.e., Polymers Plus and Aspen Dynamics. The models considered the important issues of physical property and thermodynamic model selection, catalyst characterization, and reactor model. Besides, a multisite catalyst with traditional Ziegler-Natta polymerization kinetics was introduced to describe the broad molecular weight distribution of the polymers produced in this polypropylene technology. Both the continuous stirred tank reactor model and the combined plug flow reactors model were proposed to simulate the reactors. Furthermore, we validated the models using industrial data and demonstrated application of the dynamic model to grade change, start up, and shut down at a certain emergent accident. © 2010 American Chemical Society.
Qiu X.,University of Sichuan |
He G.,Lanzhou Petrochemical Company |
Ji X.,University of Sichuan
International Journal of Advanced Manufacturing Technology | Year: 2015
With the emergence of new materials, personalized requirements for product performance, and new application background in polymer material industry, a new manufacturing mode is supposed to be studied. Based on cloud computing (CC) and big data techniques, a specific cloud manufacturing (CMfg) mode of polymer material industry has been proposed, which is different from that of continuous industries and that of discrete industries. The critical technologies of CMfg, including forecasting and demand management, storage and transportation management, advanced process control, manufacturing execution system, enterprise resource planning, etc., have been discussed. Besides the service composition optimal-selection (SCOS) algorithm for flexible manufacturing and the flexible polymer manufacturing system (FPMS), a typical product mode of CMfg is studied. Finally as a case, computer-aided process planning for blending material (CAPP-BM) was explored and a kind of fast searching algorithm for blending material crafts was proposed. The algorithm was applied to search target craft in more than 60,000 sections of the standard processes, production data, and environmental data, and finished its search within 10 min. © 2015 Springer-Verlag London
Xie G.,Lanzhou University |
Cheng J.,Lanzhou University |
Li Y.,Lanzhou Petrochemical Company |
Xi P.,Lanzhou University |
And 8 more authors.
Journal of Materials Chemistry | Year: 2012
In this research, we developed a "clean" and "wet" route to produce sandwich-like fluorescent CdQ 2/GO composites sheets starting from graphene oxide (GO) and Cd 2+ in water/ethanol solution in one pot. The as-prepared CdQ 2/GO composites sheets were fully characterized by IR, XRD, TEM and TGA analysis. The CdQ 2/GO composites exhibited a strong fluorescence emission centered at 500 nm. Both the solid sample and the water dispersion could demonstrate strong green fluorescence. When incubated with Hep G2 cells at 37 °C, the CdQ 2/GO composites were found to adhere to the surroundings of the cell membrane, resulting in strong green fluorescence observed by laser confocal fluorescence microscopy. MTT assay experiment results showed that this kind of composite material had low cytotoxicity at the concentration of 400 μg mL -1. We believe this method and composite materials will open up a brand new avenue for wider applications of graphene-based materials in the detection of other types of biomarkers, biomolecular interactions, and fluorescence imaging in vitro and in vivo. © 2012 The Royal Society of Chemistry.
Wang H.-B.,Lanzhou University |
Zhang Y.-H.,Lanzhou Petrochemical Company |
Yang H.-L.,Lanzhou University |
Ma Z.-Y.,Lanzhou University |
And 3 more authors.
Microporous and Mesoporous Materials | Year: 2013
A novel solid catalyst for coupling reaction has been successfully prepared by immobilizing palladium in the nanocages of the ethylenediamine- functionalized mesoporous material SBA-16. The structure and composition of the solid catalyst were characterized by N2 adsorption-desorption, XRD, TEM, FT-IR and TGA. These results revealed that Pd(II) was successfully embedded inside the nanocages of SBA-16. This catalyst afforded high activity (over 91% conversion) for the Suzuki coupling of various aryl bromides and phenyiboronic acids in ethanol solvent at 60°C even at the loading of 0.5 mol% Pd. Moreover, the SBA-16-2 N-Pd(II) catalyst could be separated easily from reaction mixture and reused for ten times without obvious loss of catalytic activity, showing the superiority over the homogeneous catalysts in industrial applications. © 2012 Elsevier Inc. All rights reserved.
Yue H.,Lanzhou Jiaotong University |
Li H.Y.,Lanzhou Petrochemical Company
Applied Mechanics and Materials | Year: 2014
In order to improve the neural network structure and setting method of parameters, based on the glowworm swarm optimization (GSO) and BP neural network (BPNN), an algorithm of BP neural network optimized glowworm swarm optimization (GSOBPNN) is proposed. In the algorithm, GSO is used to obtain better network initial threshold and weight so as to compensate the defect of connection weight and thresholds choosing of BPNN, thus BPNN can have faster convergence and greater learning ability. The efficiency of the proposed prediction method is tested by the simulation of the chaotic time series of tent mapping. The simulations results show that the proposed method has higher forecasting accuracy compared with the BPNN, so it is proved that the algorithm is feasible and effective in the chaotic time series. © (2014) Trans Tech Publications, Switzerland.
Yang W.,Lanzhou Petrochemical Company
Petroleum Refinery Engineering | Year: 2012
The impacts of blending FCC slurry into the feed of delayed coking unit on unit operating conditions, coker product distribution and product quality as well as problems arising from FCC slurry blending are analyzed. The results ts show that, after FCC slurry blending, the liquid product yield is lowered by 1.8%, the coke yield is increased by 2. 0%, the product quality becomes poorer, the coking trend of furnace tubes is increased, the coke powder deposition in the fractionator bottom filter is serious, and energy consumption of the unit is raised. To minimize these impacts, the following measures shall be taken, such as filtration and sufficient settlement of FCC slurry to minimize the catalyst particles in the slurry before blending into the feed of delayed coking unit, possibly reducing the percentage of FCC slurry in delayed coker feed to ensure the long-term operation of the unit and strengthening the monitoring and scheduled inspection and cleaning delayed coker equipment.
Han Y.,CAS Lanzhou Institute of Chemical Physics |
Han Y.,University of Chinese Academy of Sciences |
Qiao D.,CAS Lanzhou Institute of Chemical Physics |
Zhang L.,Lanzhou Petrochemical Company |
Feng D.,CAS Lanzhou Institute of Chemical Physics
Tribology International | Year: 2015
Three kinds of phosphonate ionic liquids (PILs), 1-butyl-3-methylimidazolium O-butyl phosphonate (BMIM-BP), 1-butylpyridinium O-butyl phosphonate (BPy-BP) and N, N-dibutylammonium O-butyl phosphonate (TBA-BP) were synthesized and evaluated as lubricants for steel/aluminum contact. Results show PILs perform much better lubricating properties than conventional ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate and liquid paraffin, although the wear volume of BMIM-BP is larger than that of liquid paraffin. The results of corrosion tests of the PILs demonstrate that the lubricating properties of PILs are relevant with their electrochemical properties. Moreover, the tribological mechanism was discussed by surface characterizations and contrastive experiment. It is concluded that the tribological performances of the PILs are related to the formation of the ordered adsorption films, tribochemical reactions and their corrosion properties. © 2014 Elsevier Ltd. All rights reserved.
Li Y.,CAS Lanzhou Institute of Chemical Physics |
Li Y.,University of Chinese Academy of Sciences |
Wang Q.,CAS Lanzhou Institute of Chemical Physics |
Wang T.,CAS Lanzhou Institute of Chemical Physics |
Pan G.,Lanzhou Petrochemical Company
Journal of Materials Science | Year: 2012
Graphene oxide (GO)/nitrile rubber (NBR) nanocomposites with various contents of GO were prepared by a solution-mixing method,in this study. The GO sheets were exfoliated from natural fake graphite by an improved Hummers method and could be further dispersed homogeneously in NBR matrix. The thickness and size of the GO sheets were observed by atomic force microscopy and transmission electron microscopy. The tribological properties of the GO/NBR nanocomposites were evaluated on a ring-block MRH-3 wear tester under dry sliding and water-lubricated conditions. The worn surface morphologies of the GO/NBR nanocomposites were observed by a scanning electron microscopy. It was found that under dry sliding, both the friction coefficient (COF) and specific wear rate of the nanocomposites decreased dramatically at first, then increased with increasing GO contents, while under water-lubricated condition, both the COF and specific wear rate of the nanocomposites decreased with increasing GO contents. Finally, the friction and wear mechanisms of the GO/NBR nanocomposites were tentatively proposed. © 2011 Springer Science+Business Media, LLC.
Zhao Z.,Lanzhou Petrochemical Company
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2015
Isotactic polypropylene (iPP) produced with an industrial heterogeneous Ziegler-Natta catalyst in lab and on industrial scale was characterized by high temperature gel permeation chromatography (GPC), differential scanning calorimetry (DSC), etc. The effects of hydrogen and external electron donor cyclohexyl methyl dimethoxy silane (CHMMS) on the relative molecular mass and its distribution, stereoregularity and crystallization property of iPP were investigated at the polymerization temperature of 60, 70℃. The results show that the influences of hydrogen and CHMMS on the microstructure of iPP depend on the polymerization temperature greatly. The content of stereoregularity pentad sequence structure is increased from 60.16% to 77.45% by adding hydrogen without CHMMS at 60℃. Hydrogen and CHMMS regulate the three-dimensional micro-defect distribution of iPP by influencing head-head or head-tail combination way of propylene molecules. ©, 2014, Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics. All right reserved.
Li Y.,CAS Lanzhou Institute of Chemical Physics |
Li Y.,University of Chinese Academy of Sciences |
Pan D.,Beijing University of Chemical Technology |
Chen S.,CAS Lanzhou Institute of Chemical Physics |
And 3 more authors.
Materials and Design | Year: 2013
Significant reinforcement of polyurethane/epoxy (PU/EP) composites in situ synthesized on the graphene oxide nanosheets (GONS) is reported for the first time. Firstly, the PU prepolymer was in situ synthesized on the GONS. Then, the EP and a curing agent were added to prepare the PU/graphene oxide/EP (PU/GO/EP) nanocomposites. Morphologic study shows that, due to the formation of chemical bonding, the GONS was dispersed well in the PU/EP matrix and formed a strong interfacial interaction between the GONS and the matrix. With the incorporation of 0.066. wt% of GONS, the tensile modulus of PU/GO/EP nanocomposites increased from 218. MPa to 257. MPa, the tensile strength and elongation at the break of the PU/GO/EP nanocomposites increased by more than 52% and 103%, respectively. Additionally, the enhancing mechanism was tentatively proposed. The thermogravimetric analysis tests show that graphene oxide slightly changed the thermal stability of PU/GO/EP nanocomposites. It is hoped that our current work could provide an effective and promising method for preparing graphene-based polymer composites. © 2013 Elsevier Ltd.