石油馏分平均相对分子质量数学关联式的建立

MATHEMATIC CORRELATION EQUATION FOR THE CALCULATION OF AVERAGE RELATIVE MOLECULAR MASS OF PETROLEUM CUTS

通过原油的实沸点蒸馏,把大庆石蜡基原油切割为TBP馏分,并对各馏分进行密度和平均相对分子质量的测定,依据测取的各TBP馏分相关物性数据,研究大庆石蜡基原油TBP馏分相关物性的关系,借助数学分析方法和计算机的高精度计算,建立大庆石蜡基原油TBP馏分的平均相对分子质量数学关联式,式中平均相对分子质量为该馏分的中沸点t和密度ρ的函数,此平均相对分子质量数学关联式的计算精度比Riazi-Daubert等建立的关联式高得多,其最大偏差仅为0.0454,该关联式在要求高精度求取石蜡基原油馏分平均相对分子质量的场合具有实用价值。

The TBP cuts of Daqing parrafin base crude oil are distillated by true boiling-point distillation. The density and the average relative molecular mass of the cuts are measured. By means of the physical properties measured, the relations of the physical properties of the TBP cuts of Daqing parrafin base crude oil are studied and the mathematic correlation equation for the calculation of the average relative molecular mass of TBP cuts is established. The equation for parrafin base crude oil is the function of the density and the mid-boiling point, that is M=f(t,p). The calculation by this equation is more accurate than that set up by Riazi-Daubert and Shou deqing, the maxium calculation error by the equation is only 0. 045 4. It is of practical value to find the average relative molecular mass of petroleum cuts from parrafin base crude oil for high accuracy.