Study On Mass Transfer Characteristics And Effective Wetting Of Catalysts Of Benzene-Alkylation In A Rotating Packed Bed

The experiment was performed in a counter-current system in which N2 deabsorbed O2 in water, mass transfer process of two kinds of catalysts with the same composition and different shape were experimentally studied. The relation of volumetric mass-transfer coefficient with rotating speed, liquid flow rate and gas flow rate were measured. The results indicate that:1. Under the operating condition, the volumetric mass-transfer coefficient in packing increases with rotating speed, gas flow rate and liquid flow rate.2. Through comparing mass-transfer characteristics of the two kinds of different shaped catalysts, one catalyst that had better performance on mass-transfer was sorted out-the spherical catalyst. 3. The experimental investigation was carried out under the condition that two kinds of catalysts were mixed with one inert packing respectively, the results indicate that mass-transfer coefficient of three-robed catalyst mixed with inert packing is greater than that before mixing, and exist a greatest value. For the spherical catalyst, the contrary is the case. The effect of specific area of catalysts on volumetric mss-transfer coefficient was discussed further, and the conclusion that gas-liquid mass transfer intensification was testified. Finally, based on the experimental data, the empirical correlation equation of the operation parameter and mass-transfer coefficient was derived.Three-robed catalyst:Spherical catalyst:In addition, internal and external effective wetting of porous catalyst in a rotating packed bed was considered in the same system. Experimental tests were carried out based on the analysis of the response curves of the reactor to a step decrease of the tracer outlet concentration. The relation of the external effective wetting with rotating speed, liquid flow rate and gas flow rate were measured. The results indicate that external wetting rate in packing increases with rotating speed and liquid flow rate increasement, and declines slowly with gas flow rate increasement.