Abstract:

The pressure difference indicated by the differential gauge of ethylene distillation tower in the 1000 kt/a ethylene plant in Dushanzi exceeded the design operating value, and the feed load was reduced, restricting the increase of overall processing load of the ethylene plant. Through analysis, it was found that the reason for this problem was the plugging of tray caused by the entrance of green oil generated in C₂ hydrogenation reactor. The plugging was removed successfully by injecting methanol into the proper position, and it was more effective to inject a large amount of methanol within a short period of time than injecting a small amount of methanol within a long period of time.

Key words:  , ethylene distillation tower；high pressure difference；green oil；methanol injection