start-ver=1.4 cd-journal=joma no-vol=64 cd-vols= no-issue=6 article-no= start-page=1021 end-page=1025 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=200608 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Alkaline hydrothermal treatment of brominated high impact polystyrene (HIPS-Br) for bromine and bromine-free plastic recovery en-subtitle= kn-subtitle= en-abstract= kn-abstract=

A method to recover both Br and Br-free plastic from brominated flame retardant high impact polystyrene (HIPS-Br) was proposed. HIPS-Br containing 15% Br was treated in autoclave at 280 using water or KOH solution of various amounts and concentrations. Hydrothermal treatment (30 ml water) leads to 90% debromination of 1 g HIPS-Br but plastic is strongly degraded and could not be recovered. previous termAlkalinenext term hydrothermal treatment (45 ml or 60 ml KOH 1 M) showed similar debromination for up to 12 g HIPS-Br and plastic was recovered as pellets with molecular weight distribution close to that of the initial material. Debromination occurs at melt plastic/KOH solution interface when liquid/vapour equilibrium is attained inside autoclave (280 and 7 MPa in our experimental conditions) and depends on the plastic amount/KOH volume ratio. The antimony oxide synergist from HIPS-Br remains in recovered plastic during treatment. A pictorial imagination of the proposed debromination process is presented.

en-copyright= kn-copyright= en-aut-name=BrebuMihai en-aut-sei=Brebu en-aut-mei=Mihai kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=BhaskarThallada en-aut-sei=Bhaskar en-aut-mei=Thallada kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MutoAkinori en-aut-sei=Muto en-aut-mei=Akinori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=SakataYusaku en-aut-sei=Sakata en-aut-mei=Yusaku kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Petru Poni Institute of Macromolecular Chemistry affil-num=2 en-affil= kn-affil=Department of Applied Chemistry, Faculty of Engineering, Okayama University affil-num=3 en-affil= kn-affil=Department of Applied Chemistry, Faculty of Engineering, Okayama University affil-num=4 en-affil= kn-affil=Department of Applied Chemistry, Faculty of Engineering, Okayama University en-keyword=Debromination kn-keyword=Debromination en-keyword=Alkaline hydrotreatment kn-keyword=Alkaline hydrotreatment en-keyword=HIPS-Br kn-keyword=HIPS-Br en-keyword=Bromine recovery kn-keyword=Bromine recovery END