Kinetics and Reaction Pathways for Heptylbenzene Decomposition in Supercritical Water
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概要
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The objective of this study is to convert heptylbenzene (HPB), the simplest model compound of heavy oil, into low molecular weight hydrocarbons with suppressing side reactions to produce high molecular weight compounds and form char. Both the dramatic changes in ion product and the dielectric constant of water at supercritical conditions turn supercritical water (SCW) into an acid or base catalyst. In this study, water was used without catalyst. The reaction was carried out in an 8.8 mL batch reactor fabricated from hastelloy C-276. The ability of SCW to decompose heptylbenzene was studied at temperatures from 425 to 475°C and pressures from 30 to 40 MPa. Heptylbenzene was converted into light hydrocarbons such as ethylbenzene, propylbenzene and butylbenzene, and into heavy hydrocarbons and gases under the above conditions. The major liquids produced were toluene, ehtylbenzene, phenylalkanes (unbranched), phenylalkanes (branched), phenylolefins, benzene and naphthalene. HPB thermolysis demonstrably followed first order kinetics, with Arrhenius parameters of an activation energy 26.37 ± 1.21 kcal/mol and the value of log (A, s-1) 10.81 ± 0.50, where A is pre exponential factor. Pyrolysis of HPB in SCW followed almost identical kinetics and SCW had little influence on the reaction paths. Low water-partial pressure was favorable towards reducing formation of heavier compounds though the overall HPB conversion was very close. Char formation was drastically reduced in SCW environment. These results suggest that water acts as a chemical reagent above its critical point (374°C and 22.1 MPa) and it decomposes heptylbenzene.
- 2011-07-01
著者
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Goto Motonobu
Graduate School Of Science And Technology Kumamoto University
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Sasaki Mitsuru
Graduate School Of Agricultural Science Kobe University
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Goto Motonobu
Bioelectrics Research Center Kumamoto University
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Mandal Pradip
Graduate School Of Science And Technology Kumamoto University
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Shiraishi Tatsuya
Graduate School Of Science And Technology Kumamoto University
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