Chemical Engineering and Material Properties III

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Authors: Qin Wang, Wei Wu, Yan Fang Tang, Jian Jian Bian, Song Wei Zhu
Abstract: The risk of di (2-ethylhexyl) phthalate (DEHP) migration from plasticized poly (vinyl chloride) (PVC) is an important issue for patients.We present a study on the effect of gamma radiation on the migration of DEHP from plasticized PVC into air and PVC as a function of time (0-28day) at 75°C.The samples were irradiated at dose of 25 kGy using a 60Co gamma radiation source.The change of weight loss at 75°C was studied as a function of time.Diffusion coefficient of samples was calculated,it was found that the diffusion coefficient significant increased after irradiation,the sample having ESO exhibited an decrease trend of DEHP migration,which shown that ESO can effectively impress the migration of DEHP from plasticized PVC either in control or irradiate samples,the same Phenomenon was found in air and PVC.The diffusion coefficient was between 8.37×10-11 and 2.68×10-10 cm2/s in air, 8.87×10-8 and 9.99×10-8 cm2/s in PVC.
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Authors: Long Li, Dao Lin Gao, Jiang Ping Zeng, Ya Fei Guo, Tian Long Deng
Abstract: Salt lake brine resource is one of the strategic resources in the western of China. Phase equilibria and phase diagrams are the theoretic foundation for the exploitation of salt lake brine resources. Hence, studies for the stable and metastable phase equilibria of lithium-containing salt-water systems are of the great importance for the development of salt lake brine resources. In this paper, the stable and metastable phase equilibria of lithium-containing salt-water systems were summarized, and the problems existed at present and the new trends in the future are also discussed.
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Authors: Bai Hui Bu, Fei Li, Ya Fei Guo, Shi Qiang Wang, Tian Long Deng
Abstract: It is well known that phase equilibria and phase diagrams can successfully guide the comprehensive utilization of the salt lake resources. The researches on phase chemistry and thermal chemistry of the calcium-containing brine system are essential to promote the development of brines. In this paper, the progresses on the phase chemistry and thermal chemistry of the calcium-containing brine system around the world from 2007 up to now were summarized. The problems existed and the new trends in the future were also carried out.
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Authors: Xu Nian Han, Mei Ling Zhao, Shi Qiang Wang, Ya Fei Guo, Tian Long Deng
Abstract: It is well known that the comprehensive utilization of salt lake resources can not only create a good economic benefit, but also effectively protect ecological environment of salt lake and achieve sustainable development. After potassium separating for potassium fertilizer from salt lakes, the rest of mother liquor brines are rich resources of magnesium and boron. Research on phase equilibria of salt-water systems containing magnesium and borate can provide reference data for comprehensive development and utilization of salt lake resources.
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Authors: Hai Qing Hu, Si Si Zhang, Ya Fei Guo, Tian Long Deng
Abstract: In this paper, the thermodynamic properties including the standard molar enthalpies of formation, the standard molar entropies of formation and the standard molar Gibbs free energy of formation of hydrated lithium borates and the water vapor pressures, the osmotic coefficients, the enthalpy of dilution, the molar heat capacity of aqueous lithium borate solution systems were summarized and the new trend in the future was also pointed out.
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Authors: Nan Zhang, Dao Lin Gao, Ming Ming Liu, Tian Long Deng
Abstract: In this paper, the methods for rubidium (Rb) and cesium (Cs) recovery from brines including salt lake brine, geothermal water and concentrated seawater were summarized, and the main problems existed were also pointed out. More details for Rb and Cs recovery from salt lake brines through fractional precipitation, ion exchange and solvent extraction were discussed, and the new trend for Rb and Cs recovery in the future were also carried out.
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Authors: Mei Ling Zhao, Xu Nian Han, Fei Li, Ya Fei Guo, Shi Qiang Wang
Abstract: It is well known that the phase diagram plays an important role in exploitation and utilization of salt lake resources. To effectively employ the systems containing lithium and carbonate, the study on phase equilibrium is essential to the comprehensive utilization of the salt lake resources. In this paper, progresses on phase equilibria of salt-water systems containing lithium and carbonate were presented.
421
Authors: Xu Xin Cheng, Hai Ning Cui, Dong Xiang Zhou, Qiu Yun Fu
Abstract: We investigated the influence of the Sm-doped contentration on the electrical properties and PTC effect of Ba-excess BaTiO3 Based Ceramics, which were fired at 1300 °C for 30 min in a reducing atmosphere and then reoxidized at 850 °C for 1 h. The results showed that the donor dopant affected PTC characteristics and the electrical properties of the BSMT ceramics, whose room temperature resistivity first decreased and then increased with an increase in the Sm3+-doped content across the range from 0.1 to 0.5 mol%. The BSMT specimens exhibited a remarkable PTC effect, with a resistance jump greater by 2.7 orders of magnitude, along with a low room temperature resistivity of 128.6 Ω∙cm at the donor-doped content of 0.3 mol%. The influence of the donor dopant on the grain size of the as-fired samples has been also investigated.
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Authors: Zeng Xin Li, Tang Bin Kuang, Xu Yi Zhou, Qiang Liang, Sheng Peng Liu
Abstract: The spent copper chromium oxide catalyst of furfural hydrogenation was recycled.by ammonia leaching method. This method not only has the characteristics of simple process, low cost, quick effect, but also avoids the use of various oxidants increasing the security of the experimental operation and the generation of carcinogen hexavalent chromium.The experimental results show that the optimum process conditions of ammonia leaching is: the concentration of ammonia 15mol / L, the leaching temperature is at 180 °C, leaching time for 4h, the optimal dosage of (NH4) 2SO4 0.6g/10g. The copper leaching rate can reach more than 80% of the maximum.
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Authors: Fei Zhao, Yu Zhang, Wen Jing Jiang
Abstract: Pillared layered MCM-36 zeolite was synthesized from pure MCM-22 precursor with polymeric silica as pillaring agent. Characterization results of acidic properties from FT-IR indicate a decrease in the amounts of Lewis acidic and Brønsted acidic. The catalytic behavior of pillared layered MCM-36 zeolite in benzene alkylation with propylene was studied. It was found that pillared MCM-36 zeolite shows stable catalytic activity in a 200h time-on-stream measurement under a relatively high propylene velocity space. The excellent selectivity to cumene over MCM-36 should be mainly due to the decrease in the amount of Brønsted acidity, while the improvement of the catalytic activity of MCM-36 can be mainly assigned to the presence of a larger amount of structurally accessible acid sites caused by the increment of mesoporous volume in this material.
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