Papers by Keyword: Xylene

Abstract: Objective: To study the effect of leptochloa on rats and mice ear swelling model. Methods: Each experiment group, mice were given corresponding drugs, according to the experiment requirement to give the corresponding dose, before the end of the experiment, the experimental model were given xylene,egg manufacture to corresponding experimental models, the determination of the experimental index.Results: Compared with the saline group, each dose Leptochloa paste group can significantly reduce the mice ear swelling; can obviously reduce the rat paw swelling. Are large doses Leptochloa paste have better effect to relieve the mice ears swelling and reduce rats paw edema. Conclusion: Leptochloa paste xylene-induced mice ear swelling model and egg white induced rat paw swelling model has a better therapeutic effect.

Abstract: Radical copolymerization of styrene (St) and maleic anhydride (MA) were typically alternating copolymerization, which generated copolymer styrene-maleic anhydride (SMA). The copolymer was synthesized by solution polymerization method,with benzoyl peroxide (BPO) as initiator and xylene as solvent, and using the yield of copolymer as evaluation criteria, the reaction conditions were researched. The maleic anhydride of molar fraction was 45% in the copolymer measured by chemical titration, combined with the theoretical that the synthesis of styrene-maleic anhydride copolymer was confirmed to be the alternating copolymer. The structure and character of the copolymer was also confirmed by IR. The glass-transition temperature of the alternating copolymer was tested by DSC.

Abstract: Chemical solution-deposited (CSD) is a cost-effective non-vacuum method for YBCO coated conductor fabrication. We developed a new fluorine-free metal-organic deposition (MOD) method with metal acetates, propionic acid and xylene as the starting materials. Using this non-fluorine MOD method, we were able to get high performance YBCO superconducting films within a shortened heat treatment time, which was reduced by at Least 5 h in comparison with that for pyrolysis-annealing non-fluorine MOD process. Superconducting property, with a critial current density (Jc) over 0.55MA/cm² at 77K, self-field has been obtained for 380 nm epitaxial YBCO thin films on (00l) LaAlO₃ (LAO) single crystal substrate. Owing to the low price of starting materials and shorter heat treatment time, fluorine-free MOD method is a very effective and cost-cutting process.

Abstract: For a distillation column under practical operation, the reflux ratio, feed location, flowrate of the top or bottom products are all very important parameters. Using the process simulation package ASPEN PLUS to solve mass balance, heat balance and phase equilibrium equations of a distillation column, the relationships between feed location and content of key components, feed location and heat loads, reflux ratio and content of key components, reflux ratio and heat loads, flowrate of the top product and content of key components, and flowrate of the top product and heat loads, can be determined. With the specifications for the content of key components as constraints, the optimal feed location, reflux ratio and flowrate of the top product can be determined. The o-xylene (OX) column in a xylene plant is optimized as a case study in this paper. Under the optimal conditions the heating utility for the reboiler can be reduced by 20%, OX can be produced by 0.8% more, and operating cost can be reduced by 2,336,000 yuan per year.

Abstract: Benzene, toluene, ethylbenzene, and the xylenes (BTEX) are the major water-soluble constituents of gasoline that may contaminate soils and natural waters, which can be sorbed by organoclays. This study investigates the sorption of toluene and xylene by organoclays produced from Brazilian bentonite (SVC) and from Wyoming bentonite (SSA) with hexadecyltrimethylammonium (HDTMA), as well as by a commercial organoclay (SCo). The organoclays were characterized by X-Ray Diffraction, Differential Thermal Analysis, Thermogravimetry. Isothermal sorption were performed. The efficiencies of the organoclays on removing toluene increased in the order: SVC-HDTMA < SSA-HDTMA < SCo. The xylene sorption by SVC-HDTMA and SSA-HDTMA organoclays was about two times higher than by the SCo. These organoclays may be used as permeable reactive barriers or in ceramic filters for petroleum waste-water treatment systems.