In our approach, we aim to solve the original MESH equation directly and make no simplifying assumptions. However, we do not need to solve all MESH equations of the column section as a part of the equations can be included in the optimization problem given in Equation ( ) and will be solved by an optimization routine. Moreover, the process variables have to be determined multiple times during the optimization of a mDWC. This means that the equations must be solved reliably and fast. For a conventional distillation column it was previously shown that this can be done by stage-to-stage calculations based on fixed point iterations (see ). In the following we will show how stage-to-stage caluclations can be used here to obtain all process variables describing a column section.