Thermodynamic Properties of Ethanol and Gasoline Blended Fuel

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• 作者：Zhaodong Nan and Zhi-Cheng Tan
• 刊名：Energy & Fuels
• 出版年：2005
• 出版时间：November 2005
• 年：2005
• 卷：19
• 期：6
• 页码：2432 - 2437
• 全文大小：196K
• 年卷期：v.19,no.6(November 2005)
• ISSN：1520-5029

文摘

The heat capacities (C_p) of five types of gasohol (50 wt % ethanol and 50 wt % unleaded gasoline93^# (E50), 60 wt % ethanol and 40 wt % unleaded gasoline 93^# (E60), 70 wt % ethanol and 30 wt% unleaded gasoline 93^# (E70), 80 wt % ethanol and 20 wt % unleaded gasoline 93^# (E80), and90 wt % ethanol and 10 wt % unleaded gasoline 93^# (E90), where the "93" denotes the octanenumber) were measured by adiabatic calorimetry in the temperature range of 78-320 K. A glasstransition was observed at 95.61, 96.14, 96.56, 96.84, and 97.08 K for samples from the E50,E60, E70, E80, and E90 systems, respectively. A liquid-solid phase transition and a solid-liquid phase transition were observed in the respective temperature ranges of 118-153 and 155-163 K for E50, 117-150 and 151-164 K for E60, 115-154 and 154-166 K for E70, 113-152 and152-167 K for E80, and 112-151 and 1581-167 K for E90. The polynomial equations of C_p andthe excess heat capacities (), with respect to the thermodynamic temperature, were established through least-squares fitting. Based on the thermodynamic relationship and the equationsobtained, the thermodynamic functions and the excess thermodynamic functions of the five gasoholsamples were derived.