Nano-sized CeO_2 powders were synthesized by homogeneous precipitation method in alcohol-water solution with HMT as precipitator and the nano-particles were characterized by TEM and BET. The process parameters which i...Nano-sized CeO_2 powders were synthesized by homogeneous precipitation method in alcohol-water solution with HMT as precipitator and the nano-particles were characterized by TEM and BET. The process parameters which influenced the sizes and agglomeration of nanometer CeO_2 powders were studied and the influence mechanism was discussed. The results show that the average size of the particles prepared by the above method with the best process parameters is about 8 nm, and the particles are of smaller size and better dispersion than those obtained from the ordinary powders synthesized by homogeneous precipitation in water solution.展开更多
In this study, we used a mixture of organic liquid propane-1,3-diol and ionic liquid 1-ethyl-3-methylimidazolium chloride([emim]Cl) as the entrainer to separate tert-butyl alcohol(TBA) + water. We measured the isobari...In this study, we used a mixture of organic liquid propane-1,3-diol and ionic liquid 1-ethyl-3-methylimidazolium chloride([emim]Cl) as the entrainer to separate tert-butyl alcohol(TBA) + water. We measured the isobaric vapor–liquid equilibrium(VLE) for the quaternary system TBA + water + propane-1,3-diol + [emim]Cl at 101.3 kPa, and found the VLE data to be well correlated with the nonrandom two-liquid model. These results show that the mixed solvent of propane-1,3-diol + [emim]Cl can increase the relative volatility of TBA to water and break the azeotropic point. We found no notable synergetic effect between them, and observed that the liquid mixed solvent of propane-1,3-diol and [emim]Cl had lower viscosity than [emim]Cl, which makes it a promising entrainer for separating the TBA + water azeotrope in industrial applications.展开更多
Four isothermal sections at 298.15K,308.15K,318.15K and 328.15K in system water-n-hexane-ethanol were measured by gas chromatograph method.The innerscaling method was used to determine the concentrations of n-hexane a...Four isothermal sections at 298.15K,308.15K,318.15K and 328.15K in system water-n-hexane-ethanol were measured by gas chromatograph method.The innerscaling method was used to determine the concentrations of n-hexane and ethanol in this ternary system.Ethy1 acetate was chosen as the sample of inner-scaling because of its separability and fit retainning time.Acetylacetone was chosen as diluent of the oil phase andn-butyl alcohol was chosen as diluent of the water phase.The experimental data of four isothermal sections at 298.15K,308.15K,318.15K adn 328.15K in system water-n-hexane-ethanol at normal pressure were given.Four schematic figures were also given.The character of these phase diagrams was analysed.They were compared with the phase diagram of system water-n-hexane-methanol.The possible causes of experimental error were discussed.The root mean square error of measurement is 1.47%.展开更多
文摘Nano-sized CeO_2 powders were synthesized by homogeneous precipitation method in alcohol-water solution with HMT as precipitator and the nano-particles were characterized by TEM and BET. The process parameters which influenced the sizes and agglomeration of nanometer CeO_2 powders were studied and the influence mechanism was discussed. The results show that the average size of the particles prepared by the above method with the best process parameters is about 8 nm, and the particles are of smaller size and better dispersion than those obtained from the ordinary powders synthesized by homogeneous precipitation in water solution.
基金supported by the Innovation Fund of Tianjin University (No. 2010XJ-0022)
文摘In this study, we used a mixture of organic liquid propane-1,3-diol and ionic liquid 1-ethyl-3-methylimidazolium chloride([emim]Cl) as the entrainer to separate tert-butyl alcohol(TBA) + water. We measured the isobaric vapor–liquid equilibrium(VLE) for the quaternary system TBA + water + propane-1,3-diol + [emim]Cl at 101.3 kPa, and found the VLE data to be well correlated with the nonrandom two-liquid model. These results show that the mixed solvent of propane-1,3-diol + [emim]Cl can increase the relative volatility of TBA to water and break the azeotropic point. We found no notable synergetic effect between them, and observed that the liquid mixed solvent of propane-1,3-diol and [emim]Cl had lower viscosity than [emim]Cl, which makes it a promising entrainer for separating the TBA + water azeotrope in industrial applications.
文摘Four isothermal sections at 298.15K,308.15K,318.15K and 328.15K in system water-n-hexane-ethanol were measured by gas chromatograph method.The innerscaling method was used to determine the concentrations of n-hexane and ethanol in this ternary system.Ethy1 acetate was chosen as the sample of inner-scaling because of its separability and fit retainning time.Acetylacetone was chosen as diluent of the oil phase andn-butyl alcohol was chosen as diluent of the water phase.The experimental data of four isothermal sections at 298.15K,308.15K,318.15K adn 328.15K in system water-n-hexane-ethanol at normal pressure were given.Four schematic figures were also given.The character of these phase diagrams was analysed.They were compared with the phase diagram of system water-n-hexane-methanol.The possible causes of experimental error were discussed.The root mean square error of measurement is 1.47%.
