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摘要: 采用石英管反应器，常压下研究了正癸烷和正己烷的气相氧化裂解（GOC）过程。实验结果表明，O2的存在降低了正癸烷GOC反应的活化能，使反应在较低的温度下具有高的反应性能；O2同时起到消除积炭的作用，提高体系的抗积炭能力。于热裂解反应相比，低温下正癸烷的GOC反应更适合制备液体组分，同时联产低碳烯烃。在600℃，碳氧摩尔比为2.5时，正癸烷的GOC反应可获得39.9％的低碳烯烃收率和30.0％的液体收率。对于直链烷烃的GOC反应，低温下O2主要进行氧化脱氢反应，高温下则更多的进行 CO x(x=1,2)的生成反应；和正己烷分子相比，相同反应条件下O2更容易引发正癸烷分子的部分氧化反应生成CO。Abstract: The gas phase oxidative cracking (GOC) of decane and hexane has been investigated in this paper. The higher performance of reaction and decoking were obtained in the GOC processes, as compared with their pyrolysis processes. At lower temperature, GOC process of decane is more suitable for producing liquid compounds, as well as low alkenes. A lower alkene yield of 13.1% and liquid yield of 37.4% were obtained in GOC of decane under the condition of 500℃ and n(C)/n(O)=2.5. For GOC of longchained alkane, O2 participates primarily in the oxydehydrogenation reactions at low temperature while it takes part in the oxidation reactions to produce COx (x=1,2) at high temperature,. Under the same reaction conditions, a higher ring opening activity was obtained in GOC of decane compared with that in GOC of hexane.
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Key words:
- decane /
- hexane /
- gas phase oxidative cracking /
- lower alkenes /
- Liquid
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