Shell chemical company released on August 17 that the company has recently begun to restart naphtha steam cracking device production. The company informed the customer in a statement that the company had lifted the force of the supply of olefins from the steam cracking unit. Shell chemical company has not released the specific restart date, it is understood, the naphtha steam cracking device with an annual output of 960 thousand tons of ethylene, 540 thousand tons of propylene, 186 thousand tons of butadiene, 276 thousand tons of benzene and 750 thousand tons of butanediol.