【摘要】 <正> 烃类和烃类混合物的某些较难测定的性质,常常是通过各种各样的关联,从二三个常见的性质予以求定。对纯烃来说,最易于确定的性质莫过于比重和沸点。就烃类混合物(包括石油馏份)而言,相应地就是比重和平均沸点。 混合物的物理和热力学性质,可以适当的方式将各组份的部份量相结合而得到,或者是应用合适的状态方程,从组份的状态方程常数按一定的混合规则得到混合物的常数后计算之。更多还原

【Abstract】 Correlations for computing weight, cubic, molar, and mean average boiling points of petroleum fractions are proposed and the data thus calculated are in good agreement with those provided by Smith and Watson Chart.For 76 petroleum fractions, the pseudo-critical temperatutes were found using both Edmister chart and Mobil-Oil nomographs; in the meantime, pseudo-critical pressures were obtained from Edmister chart as well as from winn nomogrph.Comparison and analysis of these results show that the Mobil-Oil nomogrphs give comparatively reasonable values of crisical tempertures, while in the case of pseudo-critical pressurs both Edmister’s and Winn’s graphical correlations lead to essentially same results. Correlations for evaluation of pseudo-critical temperatures and pressures of wide-boiling and narrow-cut petroleum fractions are suggested and are justified by necessary checking computations.更多还原