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
- E.g development of methods used to produce ethanoic acid from catalysts of cobalt, rhodium & iridium
- Using renewable raw resources
- 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
- Energy is passed on to other molecules, increasing their kinetic energy
- Bonds vibrate more
- Contribution to global warming depends on...
- How much radiation 1 molecule of gas absorbs
- How much of that gas is present in the atmosphere
- Greenhouse gases
- 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
- Anthropogenic change is new
- 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
- Water is the only waster product, and hydrogen can be obtained from water
- Processes in chemical industries are being reinvented so they are more sustainable
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