Advanced Materials Research Vols. 884-885

Abstract: An efficient and green approach to the synthesis of 5H-thiazolo [3,2-a]pyrimidine derivatives using N-methyl pyrrolidone hydrosulfate ( [Hnmp]HSO₄ ) ionic liquid as the catalyst is described. This green catalytic system can be recycled several times without any substantial decrease in the yields and reaction rates. The catalyst loading are high.

Abstract: Aiming at plugging removal issues of polymer flooding well, first of all, the mechanism of formation plugging is analyzed, and then, we discuss the reasons of bottom borehole block in polymer water flooding well and block laws. Finally, some typical indoor experiments are designed, during testing; some chemicals are tested, such as CJN-x, sodium nitrite, sodium sulfite etc. are tested. Through these experiments, these different effect of materials reducing viscosity is compared, among them, the CJN-1x and hydrogen peroxide possess better effect of plugging removal for polymer flooding wells.

Abstract: This paper reports an increment of conformal metal oxides or nonmetal oxides films with good crystallinity coating on natural mica synthesized by liquid phase deposition. PEG1000 and KH550 were used to increase the adsorption of oxalic acid on the mica surface. Hence, the metal ions can react with the oxalic acid, resulting in uniform and compact thick films. The potasrmanganate titration and infrared ssium pepectroscopy were adopted to obtain the optimum dosage of PEG1000 and KH550. It is shown that the condition with the usage of PEG1000 of 0.4 g/L, KH550 of 9.76 g/L, temperature of 30 °C and mixing of 4 hours is appropriate.

Abstract: A column sorption study was carried out by using four resins (D113, D001, LS-1000, LS-5000) for the adsorption of alkaline-earth metal ions from aqueous solutions. The breakthrough curve was obtained as a function of feed flow rate, and the total and breakthrough capacity values of the resins were calculated. Four kinetic models: Adams-Bohart, Wolborska and Thomas models were applied to experimental data to predict the breakthrough curves of Na-form resins and to determine the characteristic parameters of the column useful for process design. All models were found suitable for describing the whole or a definite part of the dynamic behavior of the column with respect to flow rate and inlet ion concentration. The results obtained would be helpful for the understanding of the competitive adsorption processes and the recovery or removal of one or more alkaline-earth metal ions from aqueous solutions.

Abstract: Different color tussah fabric was got applied by dye-free coloration technology. When tussah fabric was treated with p-hydroxybenzaldehyde, red tussah fabric was obtained by coloration directly and two-step for deeper color, and brown color fabric was shown in one-bath coloration. In this paper, some phenomena showing in different processes of dye-free colorations was analyzed.

Abstract: As the mechanical mechanism in interfacial phenomenon, interfacial forces are known as important but difficult to measure experimentally. In recent years, molecular simulation has been rapidly developed to give novel way in inter-molecular forces. In this study, molecular simulation is introduced into wettability and several formulas are presented to model forces and their microscopic effect among water, vapor and quartz phases. A novel dynamic method is proposed to determine the reasonable value of the cutoff distance to calculate the contact angles in vapor-water-quartz systems with and without fluorocarbon surfactants treated using molecular simulation. With other improvement in molecular simulation, the results of the contact angles are closely consistent with the measured data.

Abstract: Fe₂O₃-CeO₂/γ-Al₂O₃ was used as catalyst for treating the dye wastewater by catalytic wet peroxide oxidation method, the effect of reaction temperature, initial pH value of the wastewater, dosage of catalyst and hydrogen peroxide on the COD removal were studied. Results showed that 90.3% of COD removal rate can be obtained under the condition of 90°C, pH=7, 0.8g catalyst/100 mL wasterwater, and 6mL H₂O₂ /100 mL wasterwater.

Abstract: A molecularly imprinted microsphere (MIPs) was prepared successfully via surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. Characterization of the obtained MIPs was achieved by FT-IR and TGA. The isothermal adsorption and chiral separation experiments of MIPs on L-Carnitine were investigated. Compared with non-imprinted microsphere (NMIPs) adsorbent, MIPs showed faster adsorption rate and stronger adsorption capacity for L-Carnitine. Equilibrium experimental data of MIPs fitted the Langmuir isotherm better. Furthermore, the MIPs also exhibited enantioselectivity for L-Carnitine through the resolution experiment.

Abstract: Combustion behavior of indigenous lignite in oxygen-enriched conditions was investigated by using thermogravimetric analyzer (TGA). Combustion tests were carried out in different oxygen concentration (21%O₂/79%N₂, 30%O₂/70%N₂, 40%O₂/60%N₂, 50%O₂/50%N₂, 60%O₂/40%N₂, 70%O₂/30%N₂). Then get the characteristic temperatures. . The model-fitting mathematical approach was used to evaluated the kinetic triplet (f (α),E,A) through Gorbatchev method. The combustion stages were divided into the early combustion stage and the later combustion stage. The calculation showed that the kinetics parameters higher in the early combustion stage than that in the later combustion stage.