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Cornelia Vasile Mihai Brebu Hristea Darie Georgeta Cazacu 《Journal of Material Cycles and Waste Management》2010,12(2):147-153
Pyrolysis of polymer mixtures with a composition similar to that of municipal plastic waste containing polyvinyl chloride
(PVC) and of municipal plastic waste free of PVC was performed in the presence of components of biomass, namely lignin, cellulose,
or both. The pyrolysis products were characterized by standard methods utilized in the petrochemical industry, i.e., paraffins-isoparaffinsolefins-naphthenes-aromatics
analysis, proton nuclear magnetic resonance and infrared spectroscopy, and gas chromatography-mass spectrometry. Up to 3 wt%
lignin, cellulose, or both in mixed polymers changed the material balance of pyrolysis by decreasing the amount of waxy products.
The presence of both PVC and biomass components significantly changed the material balance by decreasing the waxy product
yield and increasing the gas and coke yield. The composition of all pyrolysis products was also modified with the addition
of PVC, components of biomass, or both. 相似文献
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Cornelia Vasile Mihai Adrian Brebu Tammer Karayildirim Jale Yanik Hristea Darie 《Journal of Material Cycles and Waste Management》2006,8(2):99-108
The increasing production of computers, the progress in their performance, and the shorter time between innovation and production
has led to increasing numbers of obsolete products. It has thus become necessary to recover some materials from old computers
and to protect the environment from a new type of pollution. Such recycling is difficult because of the diversity of polymeric
materials used, e.g., thermoplastics (polystyrene or acrylonitrile-butadiene-styrene) and thermosets (epoxy resins), and the
relatively high levels of flame retardants (halogen- and nitrogen-containing compounds) added during production. Pyrolysis
seems to be a suitable way to recover materials and energy from such waste without component separation if an efficient method
for reducing toxic compounds can be applied. In this study, the pyrolysis of plastic and thermoset fractions (keyboards, casings,
printed circuit boards, and mixtures thereof) of used computers was studied by thermogravimetry and batch reactor pyrolysis.
The degradation products were separated into three fractions, solid, liquid, and gaseous, each of them being characterized
by suitable methods such as gas chromatography (GC-MSD, gas chromatography-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 established that most of the halogens, nitrogen, and sulfur is concentrated in the residue. However, the elimination
of hazardous toxic compounds, mainly those containing bromine, is necessary before being able to safely use the pyrolysis
oils as fuels or in refinery or petrochemical industry flows. 相似文献
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