The initial distillation of coal tar,the utilization and processing of pitch and the deep processing of coking products were discussed and pertinent suggestions were offered based on the characteristics of high temperature coal tar.

Improvements on the process of light benzol forerunning are described in this paper, Practice shows that these improvements are successful.

As Lanzhou Petrochemical Company′s 5Mt/a atmospheric-vacuum distillation unit starts to switch away from heavy to light crude oil,the pressure at the top of the primary tower has reached the upper limit of 0.

This project forced on resolve the measure of the Initial boiling point、10%～90% distillation temperature、Final boiling point and the distillation rate problem.