Eszterházy Károly College Faculty of Natural Sciences
Petroleum and natural gas is made up by hydrocarbon molecules. So dominantly it consists of carbon and hydrogen, but it main contain a few percent of nitrogen, oxygen and sulphur and rarely other elements such as vanadium and nickel. The types of natural hydrocarbon molecules are the saturated hydrocarbons(paraffins and naphthenes), aromatic hydrocarbons (benzene ring), resins and asphaltenes. The natural gas only contains paraffins, and only ones in which the carbon number of less than 5. The compounds of natural gas are ethane, ethane, propane and butane. The natural gas is called dry gas if it is only made up by methane, it’s named wet gas if it made up by paraffins with carbon numbers 2-4. Petroleum consists of paraffins with carbon numbers 5-14 and other hydrocarbon molecules. If the paraffin’s carbon number exceeds 14, petroleum becomes almost as solid as asphalt.