Hydrocarbons are usually from crude oil by fractional distillation(分馏) Gas Gasoline Fig 12.3 a 30°c-180°c schematic for Naphtha the fractional 110°c-195°c distillation of → Kerosene petroleum into 170c-290°C its useful hydrocarbon → Heating oil components 260°C-350°c Lubricating oil Heated 300°c-370°c crude oil at370°c → ResidueHydrocarbons are usually from crude oil by fractional distillation (分馏). Fig12.3 a schematic for the fractional distillation of petroleum into its useful hydrocarbon components