Diffusion Transfer in the course of Benzene Alkylation with Propylene over a β-Zeolite Catalyst

摘要

By simulating benzene alkylation with propylene over β-zeolite in a fixed-bed bubble reactor, suit- able external mass-transfer correlation equations were chosen from the literature to calculate the coefficients and the external mass-transfer resistance. The internal mass-transfer resistance was derived from the experi- mental efficiency factor of catalyst pellets. When the catalyst pellet is 3 mm in diameter and consists of 0.2-μm zeolite crystal, the mass-transfer resistance in the alkylation process decreases in the following order: gas-liq- uid film＞liquid-solid film＞macropore diffusion＞intrinsic kinetics＞intracrystalline diffusion.