Abstract:

A kinetic model involving effectiveness factor of external diffusion was proposed based on the experimental data on the benzene alkylation with long-chain olefins over solid acid catalyst at different mass flow velocities.The model can be used for the determination of experimental conditions at which the resistance of external diffusion was eliminated.The model parameters were evaluated，and the model was justified by variance analysis and residual analysis.The agreement between the prediction values by the kinetic model and experimental data was satisfactory.The results showed that the external diffusion factor went up with increasing mass flow velocity sharply at first，then approached 1 slowly.When the reaction time was prolonged，the external diffusion factor increased continuously.If the alkylation rate increased，the weight hourly space velocity required for eliminating the influence of external diffusion raised.The results indicated that the effect of external diffusion for the benzene alkylation with long-chain olefins over solid acid catalyst could be eliminated when the mass flow velocity was 4.0 g·cm^-2·h^-1.