废轮胎热解石脑油馏分的组成分析

Scrap tires were pyrolysed in a pilot-scale kiln reactor in the temperature range of 450 ℃～650 ℃ and properties of the naphtha fraction of the derived oils were analyzed. In separating the naphtha through distillation, it was found that the naphtha yield increased explicitly with increasing pyrolysis temperature and reached a maximum of 40.48% at 600 ℃, then decreased at the increased temperature of 650 ℃. Qualitative and quantitative analysis of the composition of pyrolytic naphtha was carried out on GC and GC-MS. It was shown that the pyrolytic naphtha was highly aromatic. The content of aromatic hydrocarbons kept increasing with pyrolytic temperature and amounted to over 80% in the pyrolytic naphtha with pyrolytic temperature higher than 550 ℃. BTX-aromatics, including benzene, toluene, styrene and xylenes, were the main aromatic hydrocarbons in the pyrolytic naphtha. The alphatics in the pyrolytic naphtha were predominantly unsaturated hydrocarbons. It was concluded that the pyrolytic naphtha might be used as a feedstock for BTX-aromatics.