Data comparison between molecular distillation and high vacuum distillation

With atmospheric residue as raw material,8 narrow fractions of vacuum gas oil( VGO) and1 fraction of vacuum residue were obtained by molecular distillation and high vacuum distillation respectively. Distillation curves of the two distillation methods were plotted,and the property parameters of the cut fractions,such as density,refractive index,average relative molecular mass,dynamic viscosity and element content were compared. The results showed that molecular distillation had higher yield than high vacuum distillation at the same distillation temperature,and the yield difference between the2 distillations was up to 2. 22 percent points in350-540 ℃. With increasing the cutting temperature,the properties of these two series of cut fractions,such as density,refractive index and average relative molecular mass increased,which exhibited similar changing trends.