【摘要】 用低温绝热量热计测量了国产93#无铅汽油和乙醇混合体系(10wt%乙醇+90wt%汽油)在78~320K温区的热容.用最小二乘法拟合了热容与温度的函数关系.由热容随温度的变化曲线可知,混合体系在93.17K发生玻璃化转变;在150.86K发生固—液相变.分别计算了相变过程中的焓变和熵变.计算了以298.15K为基准的该混合体系的热力学函数.更多还原

【Abstract】 The heat capacities (Cp) of gasohol composed of 10 wt% ethanol and 90 wt% gasoline 93# were determined by an adiabatic calorimeter. The glass transition temperature was found to be 93.17 K. The solid-liquid transition temperature was found to be 150.86 K. The enthalpy and entropy of the phase transition were calculated. The relationship of Cp with respective to temperature T was established by using least squares method. According to the relationship, the thermodynamic functions of the gasohol were derived.更多还原