Abstract:

Preheating is required for the first startup of EO reactor after the overhaul of EO/EG unit. The oxygen flow rate should not be too high, just slightly higher than the minimum flow limit. Over high oxygen flow rate may trigger the high oxygen concentration interlock at reactor outlet. The inlet and outlet oxygen concentration increases first and then decreases. The outlet oxygen concentration decreases obviously, and the oxygen balance gradually rises and finally tends to a stable value. The limiting factor of critical ethylene flow is catalyst selectivity. Higher catalyst selectivity leads to higher ethylene flow and more difficult oxidation reaction.

Key words:  ')">

 , reaction startup, process study, EO/EG unit