Hydrocarbons are compounds comprised exclusively of carbon and hydrogen and they are the dominant components of crude oil, prosecced petroleum hydrocarbons(gasoline, diesel, kerosene, fuel oil and lubricating oil), coal tar, cresote, dyestuff and pyrolysis waste products.
Light Hydrocarbons:
Hydrocarbons with low molecular weight such as methane, ethane, propane and ethane are termed as Light hydrocarbons(LHs).
Heavy Hydrocarbons:
Heavy hydrocarbons are a heterogeneous compounds consisting mainly of alkylated cyclics, resins and asphaltenes and depending on the source, can form a significant proportion of crude oil.