Thermal Decomposition Kinetics of 1,3,5-Triisopropylcyclohexane
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- 作者：R. V. Gough ; J. A. Widegren ; T. J. Bruno
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2013
- 出版时间：June 19, 2013
- 年：2013
- 卷：52
- 期：24
- 页码：8200-8205
- 全文大小：204K
- 年卷期：v.52,no.24(June 19, 2013)
- ISSN：1520-5045
文摘
Recent surrogate diesel fuel mixture development identified the need for a multiply substituted, low cetane number, high molecular mass monocycloalkane component. On the basis of a thermophysical property evaluation and prediction, 1,3,5-triisopropylcyclohexane was chosen to serve this need. This fluid is not commercially available; therefore, very few thermophysical property measurements exist, and the thermal decomposition kinetics have not yet been investigated. In this work, we study the thermal decomposition kinetics of 1,3,5-triisopropylcyclohexane between 350 and 425 掳C. The decomposition reactions were performed in stainless-steel ampule reactors. At each temperature, the extent of decomposition as a function of time was determined by analyzing the thermally stressed liquid phase by use of gas chromatography. These data were used to derive pseudo-first-order rate constants that ranged from 2.38 脳 10鈥? s鈥? at 350 掳C to 7.28 脳 10鈥? s鈥? at 425 掳C. The Arrhenius parameters of the thermal decomposition of 1,3,5-triisopropylcyclohexane were measured to be A = 5.67 脳 1016 s鈥? and activation energy Ea = 279 kJ/mol. These parameters can be used to estimate decomposition rates at other temperatures and are critical to the successful application of 1,3,5-triisopropylcyclohexane in experimental and modeling studies of surrogate diesel fuels.