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以辽河原油小于３５０℃馏分油实测常压汽液平衡数据为依据，选用ＡＰＩ推荐的ＳＲＫ状态方程，按假多元系法进行了相平衡常数和体系泡、露点温度的计算．重点考察了六种不同临界参数关联式匹配方案对预测效果的影响，结果表明，用方案四预测露点温度效果最好，平均绝对偏差３．４８Ｋ，平均相对偏差０．６８％，可用于工程计算．
Based on the measured atmospheric-vapor-liquid equilibrium data of Liaohe crude oil less than 350 ℃, the API equation of SRK equation was selected and the phase equilibrium constants and bubble and dew point temperatures were calculated according to the pseudo-multivariate method. The effects of six kinds of correlation matching schemes with different critical parameters on prediction are investigated emphatically. The results show that the best dew point temperature is predicted by the fourth scheme, the average absolute deviation is 3.48K and the average relative deviation is 0.68%, which can be used for engineering calculation .