By integrating this relation (Eq. (6.6)) into the expression of the reaction rate (Eq. (6.5)) the number of adjustable parameters can be reduced to one, since the value of the equilibrium constant can be directly calculated based on the experimental data (see Eq. (6.7)). The forward reaction rate constant kf was fitted to the experimental kinetic data by a non-linear regression. The regression was performed in the simulation environment Aspen Custom Modeler® by use of a non-linear least square algorithm.