Some quality indexes of gasoline and diesel in developed conturies,quality requirements of clean fuels and problems in production,upgrading of traditional techniques for petroleum refining as well as the new techniques to be commercialized in the 21st century were introduced.Prospects for refineries in the 21st century were introduced together with process diagrams of the super clean gasoline refinery,super clean diesel refinery,no sludge refinery and conventional natural gas refinery.
