Even though film-renewal theory for gas-liquid mass transfer represents the most realistic mass transfer model under turbulent conditions, it is rarely used in practice since this leads to a complex mathematical description and evaluation of reacting systems. However, in contrast with common opinion numerical, evaluation of this class of models is possible nowadays within reasonable time on normal workstations. Therefore, we present a numerical scheme employing this theory which is capable of calculating mass transfer rates, conversion and remaining gas holdup from system and operating parameters. In contrast with the traditional calculation of mass transfer rates based on the enhancement factor, there are no simplifying assymptions concerning the hydrodynamics of operation, and non-linear phase equilibria can be considered as well as more complex reaction schemes. Simulations for reversible and irreversible second order reactions show the parametric sensitivity as well as the influence of different mass transfer models on the predicted mass transfer rates.