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根据独立推算Pc、Tc和Vc的三个关联式,代入Z c=PcVc/RTc式中,及170个烃化合物的Z c的实验值数据,用最小二乘法电算回归得到下列推算烃类Z c的新的关联式Zc=0.1831+0.4512X-0.4347X~2 To.3784 式中:?? Tb—正常沸点温度(K); ρ——密度(20℃下,克/毫升); M——分子量; N——分子中总的原子数。用上式对170个烃化合物的Zc值进行了计算,并与Lydersen的基团贡献法作了对比。结果表明,本法的平均误差和标准误差都较Lydersen法为小。
According to the independent calculation of three correlations of Pc, Tc and Vc, the experimental data of Z c = PcVc / RTc and Z c of 170 hydrocarbon compounds are substituted into the equation of least squares to obtain the following estimated hydrocarbon Z The new correlation of c = 0.1831 + 0.4512X - 0.4347X ~ 2 To.3784 where: Tb - the normal boiling temperature (K); ρ - density (at 20 ° C / ml); M- - molecular weight; N - the total number of atoms in the molecule. Zc values of 170 hydrocarbon compounds were calculated using the above formula and compared with Lydersen’s group contribution method. The results show that the average error and standard error of this method are smaller than the Lydersen method.