Little standard error proved that PR and R-K-S EOS were suitable to regress gas-liquid phase equilibrium data of methyl chloride-n-hexane binary system.PR is superior to R-K-S.

• 其次，利用Peng-Robinson和Redlich-Kwong-Soave状态方程对一氯甲烷-正己烷气液相平衡数据进行了模拟，计算出了标准误差，证明了Peng-Robinson和Redlich-Kwong-Soave状态方程在拟合一氯甲烷-正己烷二元体系气液相平衡方面是可靠的，且Peng-Robinson状态方程要优于Redlich-Kwong-Soave状态方程。