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作者采用模型分子法、n-d-M—LP法和将以上两种方法相结合的联合法确定石油馏分的基因构成。选用Lyderson基团贡献法计算临界温度T_C与临界压力P_C,并与43组国产石油直馏馏分油的实测值相比较。结果表明联合法的预测效果最好。T_C和P_C的平均相对偏差分别为1.36～1.39％和6.70～6.80％,能满足工程计算之用。此外,文中还简要介绍了国内外应用UNIFAC-VLE和CORGC-EOS两个基团贡献模型预测石油馏分气-液平衡的情况。
The authors used the model molecular method, the n-d-M-LP method, and a combination of these two methods to determine the genetic makeup of petroleum fractions. The Lyderson group contribution method was used to calculate the critical temperature T_C and the critical pressure P_C, and compared with the measured value of 43 domestic straight-run distillate oil. The result shows that the joint method has the best prediction effect. The average relative deviations of T_C and P_C are 1.36 ~ 1.39% and 6.70 ~ 6.80% respectively, which can meet the engineering calculation. In addition, the article also briefly introduces the domestic and international application of the UNIFAC-VLE and CORGC-EOS contribution models to predict the gas-liquid equilibrium of petroleum distillates.