离子液体降低FCC汽油烯烃体积分数的研究
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摘要: 向FCC汽油中分别加入两种与FCC汽油不互溶的Lewis超强酸性离子液体\[Bmim\]Cl-AlCl3 和 \[R4N\]Cl-AlCl3形成液-液两相催化降烯烃体系。结果表明：在汽油辛烷值基本保持不变的基础上，FCC汽油的烯烃体积分数分别下降14.7%和13.1%, 均达到我国新配方汽油规定的烯烃体积分数v<35%的新标准。对离子液体降低FCC汽油的机理及影响因素进行了详细研究。结果表明，正是由于具备Lewis超强酸性的离子液体催化的烯烃与烷烃的烷基化、烯烃与芳烃的烷基化以及烯烃的二聚反应使得FCC汽油中烯烃体积分数显著下降。Abstract: New bi-liquid phase catalytic systems containing two different types of strong Lewis acidic ionic liquids which do not dissolve in FCC gasoline, were employed to reduce the olefin content in FCC gasoline. It was shown that the olefin content decreases by 14.70% in［bmIm］Cl-AlCl3 ionic liquid system and 13.08% in \[R4N\]Cl-AlCl3 ionic liquid system, respectively, while the octane number of gasoline does not decrease. The olefin content of FCC gasoline after dealing with the ionic liquids is less than 35%, which has reached the national usage standard for clean FCC gasoline. The mechanism of olefin reducing in FCC gasoline was investigated in detail. It was the alkylation, dimerization and Frediel-Crafts reactions catalysed by the Lewis super strong acidic ionic liquids that caused the olefin reducing in FCC gasoline.
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Key words:
- FCC gasoline /
- olefin reducing /
- ionic liquid /
- alkylation /
- dimerization
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