Reforma catalitica do n-octano visando a produção de aromaticos

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

Catalytic Refonning is a process of great interest to the petrochemical industry for the production of aromatic compounds that are raw material to the manufacture of plastics, elastomers and resins. The catalytic refonning reaction of n-octane was studied in a Berty type reactor with internal recycle aiming on the maximization of xylenes and ethylbenzene. A totally automated unity for catalytic evaluation was built to estimate the effect of the operation conditions over the reaction selectivityto these compounds. The reaction products were analyzed on-line by gas chromatography. A mass spectrometer detector was used to determine the compounds of difficult identification. It was also tested the operation limits of the internal recycle reactor to conduct the work in a perfect mixture regime and minimize the interference of heat and mass transfer over the reaction rate. This reaction was promoted by an unbalanced bifunctional catalyst containing platinum and rhenium, sulfidedand deposited on chlorided y-alumina.The basic characterization of this catalyst was made; it was found a metal content of 0,22% ofplatinum, 0,44% ofrhenium, and 1,1% of chloride. The metal sites are responsible for the hydrogenation and dehydrogenation of the paraffins and for the napthenes formation. The chloride allows the desired acidity to promote the isomerization reactions that occurs over the acid sites of the alumina. The thermodynamic data of the components present were calculated using the data bank of Aspen software; enthalpies and equilibrium constants of the reactions studied were obtained, as well as the equilibriumconcentration curves as a function of temperature. The experimentalresults were used to obtain an empiricalmodei based on the rational functions that relates selectivity for the aromatics production reactions with temperature and space velocity. A phenomenological model of the reaction rate based on Hougen-Watson was built and compared to the data obtained in bench scale. Both models showed to be efficient to estimate the result values of the variables investigated

ASSUNTO(S)

hidrocarbonetos industria petroquimica catalise heterogenea catalisadores de platina

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