Abstract: A pretreatment method of solid phase extraction for pyrolysis oil from waste plastic was developed. The pyrolysis oil was separated into saturates, olefins and aromatics by double solid phase extraction column which was made up of silica gel and silver-aluminium oxide, and then they were analyzed by GC-MS-FID, respectively. According to the relationship of boiling points and retention time, the obtained gas chromatogram and total ion chromatogram (TIC) of the compounds were divided to diesel and vacuum gas oil (VGO) distillates, and the hydrocarbon compositions of diesel and VGO fractions were obtained by combining gas chromatogram and mass spectra. The hydrocarbon composition of diesel oil and VGO fraction in pyrolysis oil with wide boiling point were analyzed.

Key words: waste plastic, pyrolysis oil, silver-aluminium oxide, solid phase extraction, gas chromatography-mass spectrometry, hydrocarbon types