摘要
从P-R状态方程出发,用Newton迭代法求出真实气体的摩尔体积,然后用数值方法求P-R方程的过剩焓对温度的偏导数,从而得到真实气体的剩余等压热容,由此计算出真实气体的等压热容。给出了Newton迭代方法和偏导数数值解法。编写求解程序,实际计算了一些烃类物质的等压热容。结果表明计算的误差可满足工程应用。
Focused on working out a solution to obtain the heat capacities at constant pressure Cp, based on Peng- Robinson equation of state （P-R equation） ,Newton iterative method was adopted to derive the mole volume of real gas, and the partial derivative of excess enthalpy with respect to temperature in P-R equation was calculated by using numerical method, thus obtaining the residual heat capacities at constant pressure of real gas. The Newton iterative method and partial derivative numerical solution were presented, and the solutions to the equations were also illustrated ,which was applied to calculate Cp of some hydrocarbon compounds. The results show that the error of the calculation can satisfy the industrial requirement.
出处
《化学工程》
CAS
CSCD
北大核心
2012年第12期36-37,共2页
Chemical Engineering(China)
关键词
热力学
状态方程
密度
定压热容
thermodynamics
equation of state
density
heat capacities at constant pressure
