The volumetric mass transfer coefficient (k(L)a) is one of the most important parameters for design and scale up of gas-liquid-solid three-phase mechanically stirred tank reactors. In this work, the effects of agitation speed, superficial gas velocity, temperature, and volumetric solid concentration (C-v) on the power consumption and k(L)a were discussed and quantitatively analyzed. In an air-water-glass beads system, the gassed power number (N-PG ) and k(L)a increase remarkably with the temperature. At ambient temperature, k(L)a decreases significantly with increasing C-v with a power law exponent of 3.10, but this decreasing effect becomes weaker at higher temperatures. In this hot-sparged three-phase system, the addition of solids slows down the increasing tendency of N-PG with the temperature, but enhances the increasing tendency of k(L)a. The increase in temperature weakens the decreasing effect of C-v on k(L)a. Compared with the effect of temperature on N-PG and k(L)a, the effect of C-v is nearly negligible. As a practical guide to industrial applications, it is more effective to enhance the gas-liquid mass transfer by increasing the temperature or power consumption than by changing C-v or increasing superficial gas velocity. The empirical correlations of power consumption and k(L)a obtained in this work can provide helpful guidance for the industrial design and operation of hot-sparged three-phase stirred tank reactors. (C) 2019 Elsevier B.V. All rights reserved.