As mentioned in the previous section, the start-up strategies from Section 2.3 are adapted and then tested in the dynamic simulation model (Section 2.2). Because it is not possible to simply start the simulation with an inertized plant at ambient temperature in Aspen HYSYS V11, the plant has to be transferred from its steady operating point to dry and cold state first. Initially, the unit is in continuous operation with the specified flow rates. The steady state conditions of P1 (Table ) are obtained from an optimization described in detail by Preißinger . As purity requirement for the separation, that has to be obtained, a minimum purity of 98 mol% for each product stream is set. While the liquid splits are directly adjusted to the respective steady state values, the vapor splits self-adjust during the whole start-up process and are constantly changing until eventually, steady state conditions are reached.