Coeficientes de difusão na adsorção de metanol em zeólitas.

Abstract

Diffusion coeficients of methanol in zeolites were determined from experimental data of Becila and coworkers. These authors utilized 4A zeolites modífied by exchange of sodium by potasium in the ratio of 10%, 25% and 45%. The equilibrium curves were adjusted using the model of Freundlich isotherms. The uptake curves were simulated by a model of pore diffusion of SMITH e KELLER, with non linear equilibrium. Constant and variable diffusion coeficient was utilized in this work. The line method with PDEONE alqorithm was utilized to discreet the spatial variable, and the GEAR package with integrator to solve resulting ordinary differencial equations. The diffusion coeficients were obtained with non linear regresion using the LEVENBERG—MARQUART algorithm.