Volumetric mass transfer coefficients (k(L)a) and power input (P) are often the key parameters in the design of gas-liquid contactors. However, due to the limitations of most measurement methods, there is a lack of reliable data for predicting k(L)a for non-coalescent batches under high energy dissipation rates. Accurate k(L)a and P correlations are proposed. The reliability of the correlations is ensured by using experimental data from a wide range of process conditions conducted in multiple-impeller vessels of both laboratory scale and pilot scale, and including both non-coalescent and coalescent batches. Applying the proposed correlations, the scale-up and optimization of industrial vessels can be performed more accurately.