Abstract: With the enhancement of benefit consciousness and environmental protection consciousness, enterprises are endeavoring to implement low-emission shutdown and startup during the overhaul of production units, so as to protect the environment while minimizing the loss. During the two overhauls of the ethylene plant at SINOPEC Qilu Company in 2013 and 2017, low-emission shutdown and startup was implemented according to the characteristics of the plant. The material loss during the shutdown and startup in 2013 was reduced by more than 1000 tons compared with that during the previous shutdown and startup, and the material loss calculated on the comparable basis during the shutdown and startup in 2017 was reduced by more than 500 tons compared with that in 2009, obtaining better economic and social benefits and achieving low-emission and environmental-friendly shutdown and startup.

Key words: ethylene plant, overhaul, low emission, shutdown and startup；material recovery