Abstract:

Raw material analysis and cracking performance evaluation of heavy naphtha with an increase of about 10℃ in final boiling point during the operation of ethylene plant were carried out. The results showed that the heavy components of heavy naphtha were mainly concentrated in a distillation range from 90％ boiling point to final boiling point. This raw material was stratified seriously in the storage tank, and the tank switching process had a great impact on the system. Under suitable cracking conditions, the yields of ethylene, propylene and C4 were 33.9％, 14.79％ and 8.56％ respectively. Compared with ordinary naphtha, the yields of hydrogen, propylene and fuel oil in cracking products changed slightly, the yields of methane and ethylene decreased a little, and the yields of mixed C4 and pyrolysis gasoline increased somewhat. It can be a suitable cracking raw material when economic benefit is considered for refinery and petrochemical integration.

Key words:

ethylene')">"> ethylene, cracking feedstock, heavy naphtha, product change