Green chemistry -2

  • Created by: Shannon
  • Created on: 09-05-14 16:34
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  • Green chemistry
    • Processes in chemical industries are being reinvented so they are more sustainable
      • Using renewable raw resources
        • Some plastics are now made from plant products
      • Using renewable energy sources, or just using less energy
        • E.g use of microwave radiation to heat reactions in the pharaceutical industry
        • Biofuel
        • Solar power, wind power etc
      • Ensuring all chemicals uses are as non-toxic as possible
      • Reducing the amount of waste by recycling or producing products that a biodegradable
        • Recycling conserves supplies of raw materials
      • Using catalysts with high atom economies
        • Reduces waste and makes the best use of resources
        • Developing new catalysts to improve efficiency
          • E.g development of methods used to produce ethanoic acid from catalysts of cobalt, rhodium & iridium
            • Recent Cativa process
    • Global warming
      • Greenhouse gases
        • Water vapour
        • Carbon dioxide
        • Methane
        • Absorb IR radiation
          • Bonds vibrate more
            • Energy is passed on to other molecules, increasing their kinetic energy
              • Temperature rises
        • Contribution to global warming depends on...
          • How much radiation 1 molecule of gas absorbs
          • How much of that gas is present in the atmosphere
    • Climate change has been naturally occurring throughout history. However...
      • Anthropogenic change is new
        • Global warming is taking place more quickly than in the past
        • Human activities are to blame
    • A carbon footprint is the amount of greenhouse gases something has caused to be released
    • Carbon neutral activities have no overall carbon emission into the atmosphere
      • Burning petrol releases CO2 into the atmosphere that was trapped in the earth millions of years ago
      • Bioethanol is thought to be carbon neutral as all the CO2 released when the fuel is burned was removed as the plant crop was growing
        • Whole process is not
      • Using hydrogen gas can be pretty much carbon neutral
        • Water is the only waster product, and hydrogen can be obtained from water
          • Energy is needed for this, if this energy comes from a renewable source, then it will be nearly carbon neutral


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