Propriedades estruturais de misturas ternarias de solidos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In industrial processes, there are many examples of the use of mixture of different particles, that is, multicomponent solids. The knowledge of the properties of solids mixtures from the properties of the pure materials is of wide application in such processes. Possibly bringing advantages and improvements to the industrial processes. Therefore, the objective of this work was to determine the relationships between the physical properties of the pure solids and those of the solid mixtures. In this work, the mixture behavior of Zeolite Na Y, Kaolin and Alumina materials was studied. True density, bulk density, particle and pore size distributions, sorption isotherms, surface area, intrinsic permeability and porosity were the properties of solids studied. The solid materials were analyzed in the powdered form The pure materials were also analyzed in the form of cylindrical tablets in order to check the influence of the preparation mode on the value of both the true and bulk densities. There follows the experimental techniques used. The true density was determined by Helium picnometry. The adsorption isotherms were obtained using the static method, with the use of saturated salt solutions, at a temperature of 30°C. The adsorption isotherms were determined by Nitrogen adsorption. The surface area was calculated from the BET equation, using the data from the sorption isotherms. The particle size distribution was determined by laser diffratometry. The intrinsic permeability was calculated considering solids with cylindrical pores and the Hagen-Poiseulle flow. In addition, drying experiments were conducted for solids in the form of thin layers, at a temperature of 120°C. The proposed equations in this work relate the physical properties of the pure components pondered by its respective mass and volumetric fractions. All physical properties showed good agreement with the proposed equations. The exception was bulk density, which is strongly influenced by the process of the solid preparation. The sorption isotherms as well as the drying curves of the mixtures lied inside the limits of the curves for the pure materials proving to be direct functions of the mixture compositions

ASSUNTO(S)

adsorção zeolitos permeabilidade caulim solidos - densidade alumina

ACESSO AO ARTIGO

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