Abstract
Used tires were pyrolysed in a process development unit under vacuum at about 510°C and yielded 45% oil from which 27% (w/w) of a naphtha fraction (initial boiling point, IBP: 204°C) was separated. A new gas chromatographic configuration by combining infrared, mass spectrometric and flame photometric detectors to simultaneously analyze the effluent from a single capillary column injection was tested. Over 150 compounds were identified and quantified. Sulfur compounds distribution was established by sulfur-specific detection and selected ion GC—MS. Unlike petroleum, tire-derived pyrolytic naphtha is composed of highly branched chain isomeric hydrocarbons. Infrared spectroscopy as an extremely sensitive isomer-specific probe of molecular structures is described. Over 50 compounds were positively characterized by combining MS and IR data. It is shown that mass spectrometry provides superior quantitative capabilities, while infrared spectroscopy is an excellent complementary technique for simultaneous qualitative analysis of pyrolysis oils. Some of the difficulties encountered in the present application are discussed.
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