In China,benzene is either petroleum basedor coking based.Petroleum based benzenemainly comes from the catalytic reformingprocess in the petroleum refining industry,and coking benzene is produced by hydrogenatingcoking benzol and by acid washingand refining coking benzol.Petroleum basedbenzene accounts for 80% of China’s totalbenzene output,and the rest is coking based In China, benzene is either petroleum based or coking based. Petroleum based benzene mainly from the catalytic reforming process in the petroleum refining industry, and coking benzene is produced by hydrogenating coking benzol and by acid washing and refining coking benzol. Petroleum based benzene accounts for 80% of China’s total benzzene output, and the rest is coking based