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The removal effectiveness of the M0F-808 material for organic chloride in a plastic cracking oil was studied in light of its excellent adsorption properties. The M0F-808 materials was prepared, and then the Zrx: Fey@M0F-808 materials with different doping ratios were prepared by using a hydrothermal synthesis method. Four typical organic chlorides in the plastic cracking oil were selected to prepare a model oil, and the optimal x/y ratio was determined to be 1: 0. 67 according to the removal rate of organic chlorides in the model oil. The optimal reaction conditions and reuse performance of adsorption dechlorination experiments were determined, and the corresponding adsorption mechanism was investigated. The results indicated that the as-prepared Zr: Fe067@M0F-08 adsorption material exhibited has good structure and stability. The removal rate of chloride in the model oil was as high as 97. 66 % at an adsorption temperature of 50 °C, an adsorption time of 2 h, and an agent/oil mass ratio of 1/40. The dechlorination rate remained to be above 85 % after repeatedly using the adsorbent for 6 times. The adsorption process conformed to a pseudo-second-order kinetic model, belonging to a spontaneous chemisorption process. [ABSTRACT FROM AUTHOR]

The research progress of heavy oil catalytic cracking technology at home and abroad is summarized from three aspects: the research survey of reaction mechanism of heavy oil catalytic cracking, the analysis and comparison of molecular sieve catalytic materials for heavy oil catalytic cracking, the technical characteristics and industrial application of different heavy oil catalytic cracking processes. Firstly, modified molecular sieve catalyst materials, small-crystal molecular sieves, hierarchical pore molecular sieves have become hot spots in current research and application, so as to strengthen the hydrothermal stability of catalyst, the intracrystalline diffusion and the graded cracking of heavy oil macromolecules in the hierarchical pores of the heavy oil catalytic cracking catalyst; secondly, based on the research of the carbonium ion mechanism and the free radical mechanism of the catalytic cracking reaction and the like, the reaction severity of heavy oil catalytic cracking technologies such as DCC, CPP, HCC, RTC and HSFCC is continuously improved, and in order to match the optimal reaction environment for different feeds, new reactor or multi-reactor combination technology has become the main direction of process technology research, which has achieved the purpose of improving the yield and selectivity of light olefins. [ABSTRACT FROM AUTHOR]

Fine cracks are easy to occur in the processing of monocrystalline silicon, which affects the surface processing quality. Laser assisted machining (LAM) can soften the substitute machining area, effectively reduce the cutting force, extend the tool life and improve the surface quality. In this paper, a thermo mechanical coupled smooth particle model is established to simulate the laser assisted turning process of single crystal silicon. Under different temperature conditions, crack propagation damage and cutting stress are explored. The influence of speed and cutting depth on surface roughness. Finally, the accuracy of simulation results is verified by laser assisted cutting experiments. The results show that increasing the temperature is beneficial to the plastic cutting of monocrystalline silicon. With the increase of the cutting zone temperature, the tool stress gradually decreases. The tool stress at 300 °C is about 50% lower than that at room temperature, and the surface processing quality is significantly improved. At 600 °C, the chip is a plastic flow sawtooth line, and the plasticity is greatly improved. During cutting, a smaller cutting depth shall be selected, the rotating speed shall be lower than 4 500 r/min, and the surface roughness Sa of monocrystalline silicon can be less than 1 nm. [ABSTRACT FROM AUTHOR]

Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Sand production in Wells is the main contradiction facing the explo让ation of unconsolidated sandstone oil and gas reservoirs・ Resin consolidated artificial wellbore is the most widely used chemical sand control method in oil fields at present because of its excellent effect on fine sand control, which can achieve screen-free sand control under complex well conditions ・ The extended finite element method (XFEM) was used to simulate the crack passing through a single particle, a pair of particles and a plurality of evenly distributed particles, and the influence of nanoparticles on the crack growth path and damage dissipation energy was studied・ It was found that the influence range of nano-SiO2 on the crack was 5 nanoparticle diameters, and the best mass fraction of nano-SiO2 was 3% of the resin matrix. The results of measuring the impact strength of resin spline and the compressive strength of resin sand control body show that when the mass fraction of nano-SiO2 is 3%, the impact strength of resin spline increases about 39% and the compressive strength of resin sand control body increases about 36%, which significantly improves the mechanical properties of phenolic resin. [ABSTRACT FROM AUTHOR]

In order to explore the effect of temperature on the cracking reaction system of 1, 1, 2-trichloro-ethane, the thermodynamic simulation calculation of the system was carried out. The reactor module RG・ ibbs in Aspen Plus VI1 was adopted and combined with the sensitivity model analysis tool to calculate the equilibrium yield of each product at 150 ~300 °C under three conditions of single component, no polymerization reaction and polymerization reaction. The thermodynamic simulation results show that under standard cond让ions, the main reaction of dehydrochlorination of 1, 1, 2・trichloroethane to produce vinylidene chloride and the side reaction of producing cis-1, 2-dichloroethylene and trans-1, 2-dichloroethylene cannot be spontaneous・ The main and side reactions are endothermic reactions・ When the temperature is 150 °C, the equilibrium conversion of the side reactions to produce trans-1, 2-dichloroethylene and cis-1, 2-dichloroethylene is the lowest and the highest, respectively・ The equilibrium conversion of 1, 1, 2-trichlo-roethane cracking reaction is directly proportional to the temperature・ When the temperature reaches 300 °C, the equilibrium conversion is close to 100%. The thermodynamic properties of related substances were verified by the DMol-3 module of Materials Stu dio. [ABSTRACT FROM AUTHOR]

Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Cold-rolling oily sludge is a typical hazardous solid waste in the iron and steel industry. Clarifying the basic characteristics of cold-rolled sludge helps to realize the resource utilization and harmless disposal of it. The basic characteristics of cold-rolling oily sludge and its oil and solid phases were studied by scanning electron microscopy， thermogravimetric analysis and rheological analysis … etc. The results showed that cold-rolling oily sludge was a high viscosity emulsion formed by mixing oil， water and solids and the mass fractions of oil， water and solid phases were 47.28%， 27.15% and 25.57%， respectively. The viscosity of cold-rolling oily sludge was 1.439 Pa·s at 25℃ and 100 s-1. The pyrolysis process of it included the evaporation of moisture， desorption of adsorbed gas, decomposition of light fatty acid organic compounds, cracking of heavy organic compounds and reduction of iron oxides with carbon residues. The mass fractions of saturates, aromatics， resins and asphaltenes in oil phase were 8.030%, 0.394%, 86.436% and 5.139%, respectively， while the resins were mainly composed of long-chain fatty acids such as palmitic acid, oleic acid, and stearic acid, and the distillation range of it was 300～500℃. The solid phase contained magnetite and iron metal (Fe)，and the mass fraction of Fe element was 66.08%. The average particle size of the solid phase was 503.622 μm. [ABSTRACT FROM AUTHOR]

The vacuum residue thermal cracking reaction (nitrogen atmosphere) at different temperatures were explored using vacuum residue as raw material. And the asphaltene samples were extracted from the vacuum residue and its thermal cracking residues, which were further characterized by elemental analysis, infrared spectroscopy, Raman spectroscopy, scanning electron microscopy to reveal the content, composition and microstructure changes of asphaltene molecules under thermal stress. The results show that the asphaltene content of the thermally cracked residue experienced an increasing trend followed by a steady decline that was accompanied by a gradual increase in the yield of the insoluble toluene with an increase in the operating temperature. The molar ratio of hydrogen to carbon decreases significantly with the increase of reaction temperature, while the CH2/CH3 in asphaltene molecules decreases slightly. The aromaticity index [IAr=I3 047 /(I3 047+I2 918)] increased from 0.021 to 0.097, which indicates the thermal treatment promotes the aromaticity of asphaltene.In addition, the thermal treated asphaltene have more loose surface and shows irregular pore structure. [ABSTRACT FROM AUTHOR]

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to explore the effect of nano-SiO2 on asphalt properties, modified asphalt mixtures with different nano-SiO2 doping contents were prepared. The properties of nano-SiO2 modified asphalt mixtures were characterized by rutting test, water immersion Marshall test, freeze-thaw splitting test and low temperature cracking resistance test. The results show that the modified asphalt with 5wt% doping content of nano-SiO2 has the lowest penetration and higher softening point and viscosity. Compared with the base asphalt, the rutting depth of 5% (mass fraction) nano-SiO2 modified asphalt mixture was reduced by 45.90% and 52.27% at 45 and 60 min, respectively, the dynamic stability was improved by 60.57%, and the residue was stable after immersion in water for 48 h. The tensile strength is up to 90.69%, the freeze-thaw splitting strength ratio is up to 91.24%, the flexural tensile strength is increased by 17.70%, the maximum flexural tensile strain is increased by 11.36%, and the bending stiffness modulus is increased by 8.86%. On the whole, the high temperature performance, water stability and low temperature crack resistance of 5wt% nano-SiO2 modified asphalt mixture have been significantly improved, and it has good road performance and application prospects. [ABSTRACT FROM AUTHOR]

Copyright of Clean Coal Technology is the property of Clean Coal Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to prevent the cracking of large volume marine concrete, which result in water seepage deterioration of the structure,the double-control technology (temperature field and expansion history control) with anti-cracking agent is used instead of the cooling water pipe to control large volume concrete crack. The mixing ratio is low cement dosage, high content mineral admixture and 8% anti-cracking agent. The anti-cracking agent has the effect of reducing the early hydration heat release rate,the expansion storage pre-compression stress during the temperature rise phase and the compensation for shrinkage deformation during the temperature reduction. At the same time, the work performance,mechanical properties and durability of the concrete are excellent. After the calculation and analysis of cracking risk through finite element simulation,when the length of the anti-cracking concrete is poured within 20 m, the cracking risk value is less than 0.7, and the concrete will not crack,meet design and construction requirements. [ABSTRACT FROM AUTHOR]

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The coal cylinder models were static cracking destroyed at different rates by soundless cracking agent. The microseismic signals in the rupture process were monitored by ZDKT-1 type coal or rock dynamic disasters experimental simulation system. The authors tried to analyze the amplitude, energy and frequency-spectrum characteristics of microseismic signals during the static cracking of coal. It was found that the longitudinal cracks were more than transverse cracks after the static cracking of coal, the radial tensile stress was more obvious than the axial tensile stress. The static cracking process of coal could be divided into three stages：micro crack stage, expansion stress transfer stage and cleavage stage. With the static explosion process, the greater of the average amplitude of microseismic signals, coda wave development, and the frequency domain of signals were wider too (but dominant frequency decrease). The frequency domain of main shock and coda wave are different. It is possible to evaluate the process of the static cracking of coal seams by the amplitude of microseismic, the development of coda wave and the spectral characteristics. The microseisms signals are paroxysmal, the amplitudes and energies of microseismic signals in the static cracking process do not change monotonically, but show volatility changes. The numbers of microseismic events are related to the macro crack areas. It is possible to evaluate the permeability improvement effect in the process of the static cracking of coal seams by microseismic count. [ABSTRACT FROM AUTHOR]

Laboratory construction in universities directly effects on the quality of teaching, research and management, and it is a prerequisite for constructing the top-ranking university. Compared with the laboratory construction on macro perspective, the creating process of an entity laboratory is equally important. In this paper, the establishment for a small ACE-centered fluid catalytic cracking (FCC) refinery laboratory of East China Normal University was described in detail according to the laboratory layout, equipment purchase, equipment installation, laboratory run, testing of ACE's performance. And the laboratory was enriched and perfected after the latest three years running. [ABSTRACT FROM AUTHOR]

Main failure modes and application limit of low alloy steel oil country tubular goods (OCTG) for sour service by relevant international standard were analyzed in this paper. The influences of metallurgical and environmental factors upon sulfide stress cracking (SSC) resistance property were discussed, and selection of SSC evaluation methods were described from the point f stress analysis and fitting for service. [ABSTRACT FROM AUTHOR]

Under laboratory conditions, nitrogen adsorption from the coking wax oil was studied respectively by D72 and D001-CC cationic activation resins as adsorbents in a continuous fixed bed reactor. Micro reaction system of fluid catalytic cracking unit was used to study the catalytic racking reaction performance of coking wax oil after denitrification. Adsorption properties of two kinds of activation resin were compared by studing the adsorption breakthrough curve in the fixed bed, the dynamic adsorption properties of alkaline nitrogen compounds in the coking wax oil and the affect of the adsorption temperature on the removal rate of basic nitrogen compounds. Catalytic cracking performances of coking wax oil before and after denitrification were finally compared with catalytic cracking experiments. Results of experiments showed that the optimum adsorption temperature of D001-CC activation resin was 70 °C, the adsorption capacity was saturated 6 hours later, and the saturated adsorption capacity is 19. 35 mg/g. The optimum adsorption temperature of D72 activation resin was 60 °C,the adsorption capacity was saturated 5 hours after, and the saturated adsorption capacity was 7. 75 mg/g. The degree of catalytic cracking of coking wax oil deepened and the conversion rate improved after dealing with the resin denitrification. When the reaction temperature was 400 °C, the conversion rate of coking wax oil without denitrification was 44%. The conversion rate of coking wax oil reached 81. 5% after 30 minute's adsorption denitrification treatment. The influences of alkaline nitrogen content on catalyst activity were more sensitive at higher reaction temperature. The more substantially decrease of alkaline nitrogen content in the coking wax oil, the more significantly increases of catalytic cracking conversion rates. [ABSTRACT FROM AUTHOR]

By extending Bueckner's principle suited for a crack to a hole crack problem in infinite plate in tension, here, the original problem (the hole crack problem in infinite plate in tension) is divided into a homogeneous problem (the one without hole crack) subjected to remote loads and a hole crack problem in an unloaded body with applied tractions on the surfaces of hole and crack. Numerical results illustrate that the approach is very simple and effective for analyzing the hole crack problem in infinite plate in tension and by which a crack emanating from a triangle hole in infinite elastic plate in tension is analyzed in detail. The effect of hole geometry parameters on the stress intensity factors is revealed. It is found that a hole has a shielding and an amplifying effect on the stress intensity factors of crack emanating from the hole, and the shielding and amplifying effects varied with hole geometry parameters. [ABSTRACT FROM AUTHOR]