Affiliation:
1. Neue Materialien Bayreuth GmbH Gottlieb-Keim-Straße 60 95448 Bayreuth Germany
2. INEOS Styrolution Group GmbH Mainzer Landstraße 50 60325 Frankfurt am Main Germany
3. University of Bayreuth Macromolecular Chemistry I and Bavarian Polymer Institute Universitätsstraße 30 95440 Bayreuth Germany
Abstract
AbstractChemical recycling is a method to close the recycling loop for polymers. This is particularly applicable for polystyrene (PS), where the monomer styrene is directly formed by depolymerization and subsequently utilized for the production of new PS. However, some waste sources contain critical additives as legacies, such as brominated flame retardants. There is a profound need to remove these substances from the material, as current thresholds do not allow such additives above certain limits in new products. In this work we present the beneficial use of basic oxides during the thermal depolymerization of a mixture of PS and 1,2,5,6,9,10‐hexabromocyclododecane. It was demonstrated that especially barium oxide and calcium oxide allowed the reduction of bromine up to 96 % in the crude styrene oil.
Subject
Industrial and Manufacturing Engineering,General Chemical Engineering,General Chemistry
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