Contact Process - Making Conc. Sulfuric Acid

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  • Created by: Katy **
  • Created on: 19-04-14 16:03
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  • Making Conc. Sulfuric acid
    • Raw Materials
      • sulfur
      • air
      • water
    • H2SO4
    • 1st Reaction
      • burn sulfur in air
        • sulfur dioxide gas
          • corrosive
      • Sulfur + Oxygen ? Sulfur dioxide
        • S + O2 ? SO2
    • 2nd Reaction
      • sulfur dioxide is reacted with more air
        • sulfur trioxide
      • Sulfur dioxide + Oxygen ? Sulfur trioxide
        • 2SO2(g) + O2(g) ? 2SO3(g)
        • reversible reaction
      • Temperature
        • increase
          • reaction will decrease temperature
            • reaction goes backwards
          • yield of SO3 decrease
          • rate of reaction increase
          • cause problems with SO3 yield & rate
        • decrease
          • reaction will increase temperature
            • reaction goes forwards
          • yield of SO3 increase
          • rate of reaction decrease
          • cause problems with SO3 yield & rate
        • SO3 yield & rate require different temperatures
          • moderate temperautre
            • 400-500'c
            • increase rate
              • vanadium (VI) dioxide catalyst
      • Pressure
        • increase
          • reaction will decrease pressure
            • reaction goes forwards
          • yield of SO3 increase
          • rate of reaction increase
        • decrease
          • reaction will increase pressure
            • reaction goes backwards
          • rate of reaction decrease
          • yield of SO3 decrease
        • 1 atmosphere used
          • 95% yield of SO3
          • high rate
        • cost for high pressures not balanced by increase in SO3 yield or rate
    • 3rd Reaction
      • sulfur trioxide is added into concentrated sulfuric acid
        • oleum (mixture)
      • oleum is dilluted with water
        • conc. H2SO4
      • SO3 can't be added to water
        • too dangerous
        • highly exothermic
      • SO3 + H2O ? H2SO4
    • act as dehydrating agent
    • Vanadium (VI) oxide catalyst
      • can be poisoned by impurtites
      • stop working

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