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The flow behavior and mass transfer in a three-phase extal-loop airlift reactor can be improved by adding large particles. The mass transfer and liquid dispersion behavior for a three-phase extal-loop reactor with large particles are studied in terms of the effect of the diameter and loading of the large particles on the liquid dispersion coefficient and mass transfer coefficient. The results showed that increasing the diameter or loading of the large particles tend to decrease dispersion and intensify mass transfer, and that an increase in the diameter of the large particles remarkably decreases the particle loop rate, while the effect of fine particles is much less notable.