废轮胎回转窑中试热解油的理化性质
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摘要: 研究了回转窑中试反应器中废轮胎热解所得液体产物油的品质。热解反应在中温段(450℃～650℃)进行，油产率在500℃有最大值45.1%，此后随温度升高而呈下降趋势。对热解油的品质进行了考察，获取了热解油的完整实沸点蒸馏曲线。结果表明，热解油品质较轻，200℃以下轻馏分总量高达33%～40%，而且热解温度的升高也有助于增加轻馏分含量。对各馏分进一步的FT-IR分析显示，较高热解温度下热解油具有较强的芳香性，并可从谱图中识别出苯、萘及其烷基衍生物等芳香类物质。600 ℃和500 ℃热解油低馏分FT-IR分析结果体现了热解芳烃类物质生成的Diels-Alder反应途径。Abstract: Scrap tires were pyrolysed in a pilot-scale kiln reactor at 450 ℃～650 ℃ and properties of the derived oil were investigated. The oil yield reached a maximum of 45.1% at 500 ℃ and then decreased with increasing pyrolytic temperature. A distillation was carried out and complete distillation curves were acquired. It was shown that the weight percentage of the fraction below 200 ℃ amounted to as much as 33%～40% and the increasing of pyrolytic temperature help raise the amount of light fraction. The pyrolytic oil and the oil fractions were subjected to FT-IR analysis, and it was shown that higher pyrolytic temperature resulted in higher aromaticity of the oil. This could be explained by the Diels-Alder route of the primary oil vapor to secondary aromatic compounds. Several aromatics, such as benzene, naphthalene and their alkyl derivatives, could be discriminated from the FT-IR spectra.
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Key words:
- scrap tire /
- pyrolysis /
- distillation /
- aromatics /
- FT-IR
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