The design of reactive exchange processes is generally accomplished with the aid of the enhancement factor, whose calculation is fequently possible only by iterative and approximate methods. In contrast, a mathematical model linking microscopic reaction-diffusion equations with macroscopic phase balances permits direct calculation of absorption. Complication reaction pathways and non-linear phase equilibria can there also be considered without making simplifying assumptions. The influence of liquid phase viscosity on exchange parameters can be quantified and included in model calculations by coupling the more comprehensive film penetration theory and the theory of isotropic turbulence. Simulations not only demonstrate the influence of the system and operating parameters on absorption but also indicate the importance of the choice of excange model in systems with conversion-dependent liquid phase viscosity.