During the course of the TBP distillation, the distillates which accumulate between specified temperatures are withdrawn.

These curves and datas are of great use to compositions and function of petroleum ether and liquid paraffin, this analytical method is based on TBP distillation of coal liquefied oil.

Based on the atmospheric residue TBP data Obtained by TBP distillation data of crude and supercritical extraction method, a method obtaining the full range distillation TIP data were developed.