Abstract: Temperature runaway model was built for EBHP decomposition, and temperature runaway curves were drawn for two working conditions, i.e., with or without cooling system. The inhibiting effect of EB flush and emergency cooling water quench on temperature runaway was analyzed. The results showed that the EBHP temperature runaway model could predict the change of temperature with time. The temperature alarm value was 120℃ and the interlock temperature was 140℃. A 630/300 kt/a SM/PO unit was taken as the example, and the EBHP flow rate was assumed to be 1000 t/h. The temperature runaway could be inhibited rapidly and effectively when the EB flow rate was equal to 30% of the feed or the emergency cooling water flow rate was equal to 6.5% of the feed. This research has provided basis and reference for the safety design and stable operation of the unit.

Key words: ethylbenzene hydrogen peroxide/EBHP, EBHP decomposition, reaction temperature runaway, model building, control plan