Demonstrator für zyklische Probennahme undschnelle Gaschromatografie in derKunststoffaufbereitung

The work presented here aims at a process compatible sampling and gas chromatography to enable realtime monitoring of contaminants in plastics recycling. The technique makes use of the fact that the plastic material is molten in a closed compartment which is evacuated continously. Main work items were the identification of the substances in this gas space and the development of a suitable sampling technique that allows the transfer of a representative sample into the gas chromatography part. The fast temperature changes necessary for a real-Time monitoring could be realized in a modular demonstrator setup that allows for more than 12 measurements per hour. In contrast to conventional offline laboratory analyses, this enables a targeted identification of contaminated material sections.