RAG Austria AG wants to increase the hydrogen content of its plasmalysis product gas to 99.9990 vol %, so-called hydrogen 5.0. Therefore, in the course of this work, suitable gas treatment methods for the production of hydrogen 5.0. are determined and evaluated with process engineering simulations. After a systematic recording and evaluation of the technical suitability of all existing hydrogen purification processes, three technologies prove to be suitable: polymer membrane separation, palladium membrane separation and pressure swing adsorption. Suitable materials are then selected for each process. MATRIMID® polyimide is chosen as the material for the polymer membrane, the alloy Pd-Cu/Al2O3 is selected for the palladium membrane and activated carbon and the zeolite LiX are used as adsorbent materials for pressure swing adsorption. The simulations are started after the design of the three technologies has been finalised. It turned out that simulations of the pressure swing adsorption technology were not feasible because the necessary data could not be found. The modelling of the membrane separation plants was successful. The results showed, in agreement with the reference values from the literature, that the required hydrogen 5.0 product quality cannot be achieved with MATRIMID® membranes, but only with Pd-Cu/Al2O3 membranes. The literature also suggests that the required hydrogen 5.0 product quality can also be realised by means of pressure swing adsorption.