废轮胎热解石脑油馏分的组成分析

研究了废轮胎在回转窑中试反应器中进行中温段(450 ℃～650 ℃)热解所得产物油中石脑油馏分(i.b.p.～200 ℃)的品质。对原始热解油进行实沸点蒸馏,石脑油馏分的收率随热解温度的升高而明显增加,在600 ℃取得最大值40.48%,之后又有所下降。采用GC和GC-MS对石脑油馏分的组成进行了分析。结果表明,热解石脑油具有很强的芳香性,而且芳烃含量随热解温度的升高而持续增加,热解温度在550 ℃以上的石脑油中的芳香烃含量超过80%。轻质单环芳烃苯、甲苯、乙苯和二甲苯等为其中的主要芳烃。热解石脑油中的脂肪烃多为不饱和烃。

STUDIES ON CHARACTERISTICS OF PYROLYTIC NAPHTHA FROM SCRAP TIRE PYROLYSIS

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.