Gas liquid dispersion technology is a major part of the infra structure of chemical, petrochemical and biochemical industries. Most investigators have studied flow regime and mass transfer coefficient using just the Rushton turbine. However, there are cases where not only a utilization of a inappropriate type of impeller are the waste of energy but also counter-productive. Therefore, it is the objective of this work to examine the performance of gas-liquid dispersion systems in terms of flow regime, mass transfer coefficient and the loading zone for the gassed condition using Rushton turbine, pitched blade, concave blade and vaned disc type of impellers. For the gassed conditions, we concluded that the vaned type disc gives the optimal mass transfer coefficient. We have also examined the hysteresis phenomena for Rushton turbine and established a new flow region called transition, which both the loading and flooding zone is present.

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