Crude Oil

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  • Crude oil
    • What is it?
      • Formed by the remains of animals and plants that had died and buried millions of years ago
      • Hydrocarbon molecules only contain H + C atoms
      • Thick, black, viscous liquid hat floats on water
      • A large mixture of hydro-carbons
        • Not chemically combined
    • Alkanes
      • CnH2n+2
      • Shorter chain- very flammable, very volatile, low bp, low viscosity
      • Longer chain- less flammable, less volatile, high bp, higher viscosity
      • Saturated hydrocarbon
        • C-C bonds are single covalent
    • Fractional distillation
      • Fractions contain groups of molecules with similar molecular masses
      • Liquids are separated if they have different boiling points in a mixture
      • Crude oil- heated in furnace, passed into the lower part of the column
        • Hydrocarbon vapours rise & condense at different points
          • Drawn off trays by pipes. all used for different things
    • Combustion
      • In plenty of O- complete combustion
        • Hydro-carb + O --> CO2 =H2O
      • In insufficient O0 incomplete combustion
        • Hydrocarb + O --> CO + H2O
          • Carbon- monoxide binds to the Hb in the RBC instead of O
    • Pollution
      • SO2 causes acid rain
        • Remove sulfur before burning
    • Alt fuels
      • Biodiesel, Hydrogen, ethanol
      • Renewable and cleaner
      • Vegetable oils and extracted from plants
      • Carbon neutal- absorb CO2 as they grow
      • Needs large areas of farm land to grow


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