改进的总包性立方型状态方程

An Improvement on Generalized Cubic Equation of State

改进了Ｍａｒｔｉｎ提出的总包性立方型状态方程．验证表明，Ｍａｒｔｉｎ总包性立方型状态方程为本文改进总包性立方型状态方程的特例，由改进后的总包性立方型状态方程可推导出迄今为止前人提出的各种类型的立方型状态方程，且较Ｍａｒ－ｔｉｎ方程的推导更为简捷．此外，在Ｖｅｒａ－Ｐｒａｕｓｎｉｔｚ的普遍化ｖａｎｄｅｒＷａａｌｓ稠密流体理论基础上，结合本文给出的普遍化ｖａｎｄｅｒＷａａｌｓ流体的分子位能表达式。

The improvement was made on the generalized cubic equation of state proposed by Martin.The tests showed that Martin′s generalized equation became the special form for the improved equation in the present work,all types of cubic equation of state put forward up to now could be obtained from the improved generalized cubic equation of state.The derivations using this improvement equation were simpler and more straight than those made by Martin′s equation.On the basis of the generalized van der Waals theory of dense fluids suggested by Vera and Prausnitz,in association with the molecular potential energy expression for generalized van der Waals fluids the improved generalized cubic equation of state was derived.