Skip navigation.

Feedstock recycling from plastic and thermoset fractions of used computers (I): pyrolysis

TitleFeedstock recycling from plastic and thermoset fractions of used computers (I): pyrolysis
Publication TypeJournal Article
Year of Publication2006
AuthorsVasile C, Brebu MA, Karayildirim T, Yanik J, Darie H
Journal TitleJournal of Material Cycles & Waste Management
KeywordsComputer scrap, Oils, Pyrolysis, Thermogravimetry, Toxic products
AbstractThe increasing production of computers, theprogress in their performance, and the shorter time betweeninnovation and production has led to increasing numbers ofobsolete products. It has thus become necessary to recoversome materials from old computers and to protect the environmentfrom a new type of pollution. Such recycling is difficultbecause of the diversity of polymeric materials used,e.g., thermoplastics (polystyrene or acrylonitrile-butadienestyrene)and thermosets (epoxy resins), and the relativelyhigh levels of flame retardants (halogen- and nitrogencontainingcompounds) added during production. Pyrolysisseems to be a suitable way to recover materials and energyfrom such waste without component separation if an efficientmethod for reducing toxic compounds can be applied.In this study, the pyrolysis of plastic and thermoset fractions(keyboards, casings, printed circuit boards, and mixturesthereof) of used computers was studied by thermogravimetryand batch reactor pyrolysis. The degradation productswere separated into three fractions, solid, liquid, andgaseous, each of them being characterized by suitablemethods such as gas chromatography (GC-MSD, gaschromatography-mass spectrometry detection; GC-AED,gas chromatography-atomic emission detection), infrared(FT-IR) and 1H-NMR (nuclear magnetic resonanace) spectroscopy,and elemental analysis. It has been establishedthat most of the halogens, nitrogen, and sulfur is concentratedin the residue. However, the elimination of hazardoustoxic compounds, mainly those containing bromine, is necessarybefore being able to safely use the pyrolysis oils asfuels or in refinery or petrochemical industry flows.
Login or register to post comments