立方型状态方程含过量自由焓模型的新混合规则

A NEW MIXING RULE CONTAINING EXCESS GIBBS ENERGY MODEL FOR CUBIC EQUATIONS OF STATE

提出了在参考压力下将过量自由焓(g^E)模型引入状态方程的修正Huron-Vidal混合规则,由g^E模型确定状态方程中混合物的参数,以SRK方程和Wilson模型为例,取大气压为参考压力,计算了16个体系50组汽液平衡,结果表明本文建议的混合规则可直接使用现有文献报道的常压g^E模型参数由立方型状态方程预测常压汽液平衡,并对直接外推预测高压汽液平衡作了尝试.

A modified Huron-Vidal mixing rule is presented by introducing excess Gibbs energy(gE) models into mixing rules for cubic equations of state at a reference pressure. The Soave-Redlich-Kwong equation of state and Wilson model is used as an example by taking atmospheric pressure as reference pressure. VLE data are predicted for 50 sets of 16 typical systems. Examples are also given for high pressure VLE prediction. The results show that the mixing rule enables direct incorporation of parameters of low pressure gE model for predicting low and high pressure VLE with cubic equations of state.