常用临界性质计算公式对伊朗原油馏分油的适用性考察

Evaluate the Procedures for Predicting Critical Properties of Fractions of Iran Crude

用实测的伊朗原油24组馏分油的部分物性数据,考察了常用的估算临界性质的七个估算式应用于伊朗原油的适用性,结果表明：估算临界温度的四个计算式的平均相对偏差在1.25%~2.21%之间,其中Sim-Daubert式、Lee-Kesler式和Cavett式的偏差分别是1.25%、1.43%和1.46%,优于Roess式的2.21%。Roess式、Sim-Daubert式和Lee-Kesler式以及Cavett式均可满足工艺计算临界温度的要求。估算临界压力的三个计算式中,Sim-Daubert估算式、Lee-Kesler估算式和Cavett式的平均相对偏差分别为2.31%、6.67%和7.12%,标准偏差分别为为0.109MPa、0.149 MPa和0.142 MPa,Sim-Daubert估算式可以满足工程计算的要求。

Some properties of 24 wide and narrow fractions from lran crude were determined. On the basis of experimental data available, seven empirical correlation equations tbr estimating critical temperature and pressure generally were evaluated. As a result of this investigation, it was concluded that the Sim-Daubert procedure （eq. 5） was the most accurate for critical temperature calculation, having an average relation error of 1.25 % as compared to 1.43 % for the Lee-Kesler method（eq. 6） and 1.46 % for the Cavett （eq. 7） and 2.22 % for the Roess method（eq. 4）. And another result of this investigation was that Sim-Daubert method（eq. 1） was more accurate for critical pressure calculation, having an average relation error of 2.31% as compared to 6.67 % for Lee-Kesler procedure（eq. 2） and 7.12 % for Cavett method（eq. 3）.