shenyang paraffin wax chemical’s new 120, 000 tons per year pyrolysis naphtha hydrogenation and 80, 000 ton per year aromatics extraction unit are used to produce highly purified benzene and toluene. when the program was about to finish, workers and leaders of the hydrogenation plant spent 24 hours a day to make faster production, welding, reinforcements, check hermetically sealed equipment and production processes. the new equipment finished its first production within six days, thanks to adequate preparations.