The good separation performance of the true boiling point(TBP)distillation apparatus is the key to ensuring the accuracy and reliability of crude oil evaluation data.However,the current refractive index(RI)method for measurement of the column efficiency faces problems such as complicated process and vulnerability to aromatic interference.To improve the measurement efficiency and accuracy,this paper studies the feasibility of gas chromatography(GC)method to evaluate the column efficiency of TBP distillation apparatus.Comparative analysis shows that the theoretical plate number measured by GC is lowered by 1 as compared with that measured by RI.The relative deviation of n-heptane mole fraction measured by GC and RI method is within±3％.GC can effectively eliminate the impact of aromatic hydrocarbons on the system,and meets the need for long-term stable monitoring of column efficiency.
true boiling point distillationdetermination of distillation column efficiencygas chromatographyrefractive index
万方数据
维普
