Advanced Materials Research Vols. 396-398

Abstract: The ideal adsorbed solution (IAS) theory has an advantage that no restriction exists for the type of pure component isotherm. One can choose the isotherm that fits the experimental data best. However, the theory requires a lot of numerical calculation, including numerical integration. This study shows that IAS needs very accurate values of numerical integration when the D-R equation is used as a single component isotherm. The error of numerical integration should be set to be no larger than 10-7. Otherwise the error of numerical calculation will occur, which may increase prediction deviation.

Abstract: The microstructure and main components of fly ash determined its physical and chemical properties, and also related to the comprehensive utilization of fly ash. Based on the activated and modified by acid and alkali fusion method, the specific surface area, phase, surface microstructure and X-ray micro-analysis of the original and actived fly ash was evaluated by BET, XRD, SEM and EDS. At the same time, titanium dioxide photocatalyst supported on the modified fly ash was prepared and applied on the decolorization of dye wastewater. The results showed that sulfuric acid modification could obviously improve the ratio of surface area, microstructure and phase composition of the activated fly ash. The initial concentration of 20mg /L and pH = 6 of acidic red B simulated wastewater was chosen as the target solution to test the obtained photocatalyst. The decolorization rate was over 85% when the loading amount was 20% and decoloring time was 120 minutes.

Abstract: The resistance characteristic of narrow ring runner fluid with the clearance of 0.5 ~ 2.5 mm is studied by the experiment and numerical simulation methods in this paper. The collection and monitoring of data by computer are conducted with the use of Forcecontrol soft 6.0, the pressure difference under different clearance and flow is measured. Using MATLAB, data is dealt with as well as four groups of relation curves between friction factor and Reynolds number are drafted, providing the basis for quantitative research.

Abstract: The process of hot rolling Fe-3.15% Si steel is simulated by Gleeble-3500 thermal mechanical simulator, the influence of finishing temperature, coiling temperature and cooling rates after rolling on microstructure of Fe-3.15% Si steel are mainly researched, and the influence of hot rolled microstructure on Goss texture, secondary recrystallization and magnetic property are analysed. The results show that the nonuniform microstructures of hot rolled strip play an important role in developing the perfect secondary recrystallization. Fe-3.15% Si steel is rough rolled at 1110°C, finished rolled at 880°C, subsequently cooled to 550°C for coiling at rate of 10°C/s, then air cooled to room temperature. The above mentioned process could produce hot-rolled microstructure which are benefit to formation of Goss texture and the development of perfect secondary recrystallization.

Abstract: The mechanism of cross-flow vacuum membrane distillation (VMD) was discussed in this paper, and the coupled process of heat and mass transfer in numerical simulation was realized by writing user defined function (UDF). The numerical simulation results of membrane flux were well agree with experimental data. The membrane flux in various conditions of feed velocity, feed inlet temperature and vacuum degree was obtained in numerical simulation. Around the cross-section of a single hollow fiber, velocity distribution was approximately symmetrical; TPC and heat transfer coefficient distribution are consistent.

Abstract: A series of new type acid catalyst samples based on mesoporous CaZr4(PO4)6(CZP) belonging to NZP family synthesized by sol-gel method was obtained by Al, La, B incorporation in CZP or by heteropoly acid H3PW12O7•xH2O(HPW) loading on CZP, and their acid catalytic activity and selectivity were investigated by using α-pinene isomerization as a probe reaction. The phase, pore structure and surface acidity of the catalyst samples were characterized by X-ray diffraction (XRD), N2 sorption and NH3 temperature programmed desorption (NH3-TPD) respectively. The results showed that the surface acidity of CZP modified by elements incorporation and HPW loading was improved in a different extent. The conversion of α-pinene at 150 °C reached to 41 % over the catalyst sample noted as Al-CZP-0.15 in which the mole ratio of Al to Zr was 0.15. Under the same reaction conditions, the conversion of α-pinene was above 95 % over the CZP supported with 20-30wt. %HPW.

Abstract: This paper primarily focuses on the analysis on temperature, stress and strain distribution of the heat transfer in the jet plug-in hot blast furnace aiming at obtaining the parts of the heat transfer with relatively high heat stress according to the stress and strain distribution. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, the authors can figure out that thermal stress can not be found in the highest temperature part, but in the parts with large temperature difference, and meanwhile this thesis puts forward the reasons causing these situations. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

Abstract: The crystals of nickel acetate tetrahydrate have been obtained in the existence of 4-amino-2-methylquinoline. The crystal structure of the nickel acetate tetrahydrate was determined by X-ray single crystal diffraction analysis. The crystal data for nickel acetate tetrahydrate: monoclinic, space group P2(1)/c, a = 0.48319(9) nm, b = 1.1900(2) nm, c = 0.85531(17) nm, V = 0.49064(16) nm3, Z=2, M r= 248.86, De = 1.685 g/cm3, T = 298(2) K, F (000) = 260, R = 0.0756 and wR = 0.1662. The complex forms three-dimensional network structure through hydrogen bonds.

Abstract: The title compound has been prepared and characterized by P1PHNMR, FT-IR, fluorescence spectrum and thermal analysis. The crystal and molecular structures of dimethyl-(4-(7-acetoxyl-2H -chromen-2-one))-methyl-(2-acrylate)-ethyl-ammonium bromide were determined by X-ray diffraction methods. The compound crystallizes in Monoclinic system, space group C2/c, with lattice parameters a = 22.799(5), b =12.122(2), c =14.580(3) Å, β = 90.76(3)°, Mr = 440.29, V = 4029.1(14) ÅP3P, Z = 8, Dc= 1.452 g/cmP3P, F(000) = 1808, R = 0.0679 and wR = 0.1450. In the structure, The four N-C bond distances are in the range of 1.473(6) ~ 1.531(6) Å. The P1PHNMR and FT-IR data are in agreement with the structural data. The title compound also shows good fluorescent behaviors. The fluorescent intensity changed little at pH ranging from 7.5 to 9.5. The pH value of the circulation cooling water is in this range so that the title compound can be used in tracer detection.

Abstract: Highly efficient, one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles under solvent-free conditions using molecular iodine as the catalyst is described with excellent product yields.