Advanced Materials Research Vols. 602-604

Abstract: Gas control technologies traditionally base on the physical properties of gas. However, making use of microbial technology is another way to deal with coal seam gas. This paper conducted the laboratory test firstly, selected a bacteria M02 to degrade methane efficiently, and the strains were identified as Methylophilus sp.; the conservation of matter experiment verified its ability of methane degradation; then the industrial experiment was implemented in the coal mine underground showed that by the use of methanotrophic bacteria, and the gas concentration of return air, gas content, gas pressure and the index of K1-value had been decreased in different degree. Hence large-scale use of microbial technology on gas control is feasible.

Abstract: Objective: To analyse chemical constituents of the volatiles flowers of Akebia trifoliata. Method: The volatiles of bungei were extracted through Headspace solid-phase microextracti, and then the constituents were separated by GC and identified by MS. Result and Conclusion: 22 Compounds were identified. The principal chemical constituents of the volatiles flowers of Akebia trifoliata are α- Farnesene and Farnesene*(80.827%），Ocimene and Ocimene* （14.699%）、πPatchoulene and πPatchoulene*(1.200%) etc,respectively.

Abstract: In this study, a methane/oxygen-enriched air counterflow diffusion flame was analyzed numerically using detailed chemical kinetics, on the condition that the oxygen mass fraction in the oxidizer stream varied from 21% to 99%. The obtained results show that as the oxygen concentration in air increases, the maximum temperature increases; the region of combustion reaction is gradually divided into two parts, and the total NO production rate and especially the thermal NO production rate increase greatly. With consideration of the possibility of gas recirculation to minimize NO_X in the industrial combustor, the usefulness of NOX reduction in combustion was analyzed numerically when the methane stream was diluted with the inert gases N2 or CO2. The obtained results show that the flame structure and dominant mechanism of NO formation change greatly with the concentration of diluents in fuel; the emission index of NO decreases gradually when the concentration of diluent CO2 increases.

Abstract: The properties of the acid modified kudzu starch such as the thermal stability of viscosity, swelling power, transparency, freeze-thaw stability, blue value, acid and alkali resistance, salt resistance and retrogradation was studied in order to enlarge its application in this paper. The thermal properties were analyzed by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that the swelling power, transparency, freeze-thaw, acid resistance, alkali resistance, blue value increased with increasing the degree of acidolysis of kudzu starch. Compared with kudzu starch, acid hydrolysis increased the decomposition temperature, but reduced the enthalpy change from the thermal analysis.

Abstract: Through improving the traditional causticization process, such as needle-like White Mud and rice-like White Mud are obtained by adding auxiliary agent and controlling the causticizing reaction conditions. Results show that the uniform needle-like White Mud and rice-like White Mud can be better applied to paper filling, especially the needle-like White Mud, which demonstrates higher opacity and higher whiteness than commercial PCC, while has the same influence on strength and other properties with commercial PCC.

Abstract: A process has been proposed for carbonation and recovery of lithium carbonate from lithium chloride. Based on distribution coefficients, separation factors of the results, lithium chloride extraction with n-butanol has also been studied. The purity of this lithium carbonate product was as high as 99.6 %.

Abstract: Sodium hexatitanate (Na₂O•6TiO₂) whiskers with an average diameter and aspect ratio of 1-3 µm and 10-20 respectively were synthesized by calcinating mixtures of industrial grade sodium carbonate (Na₂CO₃), anatase TiO₂ and potassium fluoride (KF). The growth of sodium hexatitanate whiskers was obtainable in a range of TiO₂/Na₂CO₃ molar ratio from 4 to 6, heating temperature from 940 °C to 1000 °C and content of KF from 5 wt.% to 7 wt.% with different morphologies and aspect ratio of the products. The role of KF on the growth behavior of Na₂O•6TiO₂ whiskers was demonstrated by structural and morphological observation.

Abstract: A new method of FGD-MFB was presented and the FGD-MFB experiment results showed the efficiency of the FGD-MFB could be improving not only with the enhancing of the intensity of the magnetic field, but also with the decreasing of the diameters of the magnetic particles: When the mean diameter of the magnetic particles(dp) is 220μm, the intensity of the magnetic induction(B) is 40mT,the ratio of the Ca(OH)2 and SO2 (Ca/S) is 1.85, the temperature of flue gas in inlet(T0) is 250°C, the desulphurization efficiency is up to 85.93%. Its micro-mechanism may be that Fe2O3 as an active center changed the formation laws of the desulfurization reaction and the magnetic field affected the characteristics of product and gas diffusion characteristics through by varying micro pore structure and surface layer and, which improve the utilization of calcium and the efficiency. To analyze the catalytic effect of the magnetic field and the magnetic particles on the desulphurization reaction , the instruments of EDAX、FEM and XRD were utilitzed.

Abstract: copolymer preparation; structure characterization; thermal stability; brines solution. Abstract. The copolymer (AM-co-NVP) of acrylamide (AM) and vinyl pyrrolidone (NVP) was carried out in the presence of 2,2'-azobis[2-methylpropionamidine] dihydrochloride（V50）as initiator by free radical polymerization. The copolymer was characterized by its chemical structure with Fourier transform infrared spectroscopy (FTIR). The heat resistance of AM-co-NVP at 100°C and 120°C in harsh saline solution with high mineralized concentration ranging from 5×104 mg/L to 20×104 mg/L containing 2.5% (mass ratio) CaCl2, 2.5% (mass ratio) MgCl2 and 95% NaCl (mass ratio) was investigated. The experimental results indicate that AM-co-NVP has excellent thermal stability in saline solution compared to partially hydrolyzed polyacrylamide (HPAM). What is more, the copolymer exhibited the most perfect thermal tolerance in high divalent saline solution when the feed molar ratio of AM and NVP is 91.5 to 8.5. The microstructures of the copolymer samples after thermal aging in hostile environment captured by scanning electron microscope (SEM）further proved the NVP monomer was effectively introduced leading to the copolymer favorable heat stability in particularly high mineralized solution.

Abstract: To construct 3D ordered hierarchical materials, Si, Al and Ti colloids precursors were controlled prepared via dual template method in which the colloidal crystals and P123 acted as hard-template and soft-template, respectively. The results showed that ordered hierarchical SiO2, Al2O3 and TiO2 were successfully prepared. The difference of the structure of samples suggested that hydrolysis rate of the precursors play an important role on pore structure of the samples.