Advanced Materials Research Vols. 233-235

Abstract: Highly uniform and monodisperse GdF₃:Eu³⁺ nanopeanuts has been successfully prepared by a sonochemical method under ambient air without any template. The as-prepared GdF₃:Eu³⁺ sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectra.

Abstract: According to the industrial operation data, modeling and flowsheeting to the full process of Sulfur-buring Sulfuric aid which contains 3 stages as following:Sulfur Burning, Conversion and Absorption were completed based on the ASPEN PLUS .Subsection Settings were applied on the thermodynamic method and choosing the suitable one for actual processes of each unit by analyzing the industrial system and process.Meanwhile,chemical reaction was built in the absorption tower. Sever important operating parameters were considered in the simulation. The simulation results showed that the model is reasonable,and could provide reference for the design ,renovation and optimization of the large-scale sulfur-buring sulfuric aic process.

Abstract: In order to study the dispersion and performance of tartrazine aluminum lake, 7 kinds of water-based resins are used to form disperse system. These systems are enviroment friendly (low VOC) and use edible yellow lake as colorant. If proper adjustment is added, these disperse systems can be made into ink and paint. The application field should be printing or coating on all the food or drug packages, toys and decorate materials, which will improve social safe level. Colorant, resin, wetting agent, co-solvent, emulsifier, and deionized water are mixed at certain ratio and pre-dispersed for 15min, then dispersed in GJ-2S high speed sanding mill for 3h. Size distribution, PDI, color characteristics (reflectance spectroscopy and color density), glossiness, abrasion performance, and stability are studied. Results demonstrate particle size of disperse system is 338.1~595.3nm (PDI<0.3) and changed to 428.6~551.2nm after 5 days or so. Reflectance spectroscopy is close to PANTONE standard yellow. Glossiness is referred as Gs(60°)≥32°. Viscosity is 0.2~2Pa·S. Relative stable disperse system is prepared.

Abstract: The geometry plays an important influence on the performance of jet reactors. Based on the fast process of acid-base neutralization, the effects of geometric parameters such as the angle of diffuser, ratio of nozzle diameter to mixing chamber diameter and the position of nozzle on mixing and reaction characteristics were analyzed using CFD in detail. The results demonstrated that: (1) an optimum ratio of nozzle diameter to mixing chamber diameter was obtained, namely 0.35. If the ratio value is larger than 0.35, the conversion rate in the jet reactor decreases, whereas if the value is smaller than 0.35, the conversion rate can not improve any more but the pressure drop increases; (2) the larger the distance between the nozzle outlet and the inlet of mixing chamber, the faster the reaction proceed is. The optimum results can be acquired when the nozzle outlet shares the same plane with the centerline of the suction inlet; (3) the smaller the angle of diffuser section, the higher conversion rate in the same cross section can be achieved and at the same time, the bigger of the pressure drop is needed.

Abstract: Poly(acrylate-co-acrylamide)(PAAM) superabsorbent was prepared from partly- neutralized acrylic acid(AA) and acrylamide(AM) by inverse suspension polymerization. Its chemical structure and thermal property were characterized by Fourier-transform infrared spectrophotometer(FTIR) and the thermogravimetric analysis(TGA). The effects of various salt solutions on the absorbencies were studied systemically. Under the same ion strengths, the absorbencies of PAAM were in the order LiCl>NaCl>KCl in MCl (M=Li, Na, K) solutions and NaBr>NaCl>NaF in NaX solution, respectiverly. The tendency of absorbency of PAAM for the alkaline earth metal salt solutions was in the order MgCl₂>CaCl₂>BaCl₂. PAAM resin is thermal stable before 320°C.

Abstract: The effects of microwave radiation pretreatment on the leaching behavior of diaspore were investigated. The influence of sodium hydroxide addition, microwave irradiation temperature and microwave irradiation time were studied, the mechanism of microwave roasting pretreatment was also studied. The results show that microwave roasting pretreatment can greatly improve the leaching efficiency of Al₂O₃, and decrease the mole fraction of digestion liquor. The optimal microwave roasting condition is that the sodium hydroxide addition is 100kg/t, the microwave irradiation temperature is 535°C, and the microwave irradiation time is 5min the roasting mechanical is that the increase of effective affecting acreage and the formation of high active alumina.

Abstract: Novel esteryl-functionalized ionic liquids from isonicotinic acid as raw materials have been designed, synthesized, and characterized for the first time.

Abstract: The article mainly analyses energy consumption in raw material pretreatment craft question of crude benzol hydrotreating process, with available energy analytic method. By calculating the available energy of heat exchangers and evaporators of K-K process, find the energy consumption situation during crude benzene refinement production, and then give some suggestions in Energy-saving Optimization measure.

Abstract: Increased production of biodiesel led to a surplus of glycerol. The utilization of glycerol is a crucial factor to the overall cost effectiveness of biodiesel industries. Using glycerol based alcohols with gasoline as an automotive fuel is a good option. And the miscibility of gasoline in glycerol based biofuel is vital for this utilization approach of glycerol. This paper attempted to had a thorough scan on the miscibility of gasoline in glycerol based biofuels and predict the maximum amount that gasoline can dissolve in with QSPR method. Results showed that gasoline exhibited better miscibility in lower alcohols than higher and polyhydroxy alcohol and miscibility of gasoline in glycerol based biofuel can be effectively predicted with QSPR method which could act as an useful tool in the further study of glycerol based biofuels’ other properties.

Abstract: This study deals with the transient response of heat exchanger which is approximated to the first-order system with delay. This function is of simple form and easy to be applied to design the practical controllers. The parameters such as gain K, time constant T and delay time are derived in this paper. On the basis of using the first-order system as the transfer function for a heat exchanger, more accurate models are built to derive the parameters K, T and respectively, which are constructed with a lumped parameter approach. Unlike a number of recent analyses K is obtained by using arithmetic mean temperature difference, log mean temperature difference has been employed instead, which minimized the error; time constant T is obtained by deriving the time constant of baffle; delay time is estimated by flow rate. The result shows that this method to study the dynamic characteristics of heat exchanger is easier, more accurate.