In the calculations with the multiple dividing wall column the benefits of the new approach become evident. First, the stability of the calculations is improved. To obtain the results using Aspen Plus R quite some effort had to be taken. The initial values had to be adjusted, bounds for the specifications had to be chosen carefully in order to avoid non converging simulations and to find an optimal solution. The stage-to-stage calculation used in the new approach converge on a large range of variables. This is why rough bounds could be used. We could show that even with random initial values convergence can be achieved in the majority of cases. Second, with the new approach solutions of a higher numerical quality could be found. The found solution shows a smaller violation of the purity specification and has a smaller objective value than the solution calculated with Aspen Plus R and an external optimization. Finally, the reduction in the calculation times is significant. In total the calculations with the new approach only took 30.55 seconds while the calculation with an external optimizer took more than 11 hours. This means that the new calculations were more than 1000 times faster.