摘要
推导出立方型状态方程计算纯流体蒸发热的新公式,该计算式的特点是式中含有能量参数对温度的导数 da/dT,而与 a(T)无关。根据这一公式对立方型状态方程推算蒸发热进行了比较分析,提出a(T)与 da/dT 相互独立的计算方法,并用 Peng-Robinson 方程对70多种物质(包括烃、醇、卤代烃、酮、无机气体等)进行了关联计算,蒸汽压和蒸发热的平均相对误差分别为0.70%和1.33%。
A new equation for the latent heat of vaporization of pure liquids by the generalized cubic equation of state was proposed.The equation was independent of the energy parameter a(T). Based on the result,a(T)and da/dT were determined by experimental data of saturated vapor pres- sure and latent heat of vaporization respectively.With this method,the average absolute deviation of saturated vapor pressure and latent heat of vaporization for 73 compounds involving 2347 data points were 0.7% and 1.33% respectively
基金
中国石化总公司发展部资助课题
关键词
状态方程
蒸发热
蒸汽压
计算
equation of state
latent heat of vaporization
vapor pressure
