The phases equilibrium constants of the five key components in the synthesis ammonia system at different temperature and pressure are predicted by the modified R-K EOS combined with Van Laar 's activity coefficient equation and CCOR EOS respectively .

本文应用改进R-K状态方程和 van Laar型活度系数 方程预测不同温度和压力下合成氨体系五个关键组分的相平衡常数；

Based on the Van Laar equation the activity coefficients are calculated of propylene carbonate and water in the binary solution of propylene carbonate water and then by means of the Raoult Law for non ideal solutions the vapor partial pressures of propylene carbonate and water are calculated .

从 van Laar 方程 出发，推算碳酸丙烯酯－水二元系溶液中碳酸丙烯酯和水的活度系数，然后再利用非理想溶液的Raoult定律，分别算出碳酸丙烯酯和水的蒸汽分压。

Results from 141 data points show that Margules equation is much better than both van Laar and Wilson equations .

141个数据点的计算结果表明，Margules 方程显著优于 van Laar 方程和Wilson方程。

The systems were correlated by the Wilson equation and Van Laar equation and the correlated results were in fairly good agreement with the measured data .

用Wilson方程及 van Laar 方程 关联 无盐及 溶 盐体系，结果表明， 两 种 方程的计算值与试验值吻合良好。

In the present paper we have calculated the liquid-liquid equilibrium data with quite satisfactory results for six binary systems of organic aqueous solution by using van der Waals equation modified by the theory of molecular aggregation and van Laar mixing rule .

本文应用由分子聚集理论改进的vanderwaals 方程 和 van Laar混合规则对六个有机物水溶液体系的液液平衡进行了计算，取得了满意的结果。