7. “ It is better to prevent waste than to treat or clean up waste after it is formed” Chemical Process
8. Risk = f(hazard,exposure) Do we consider our level of exposure and the hazard itself? Does the dose makes the poison?
9. “ Energy requirements should be recognized for their environmental impacts and should be minimized. Synthetic methods should be conducted at ambient pressure and temperature”
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11. GREEN CHEMISTRY Green Chemistry is the utilization of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and applications of chemical products.
12. “ A raw material of feedstock should be renewable rather than depleting wherever technically and economically practical” Non-renewable Renewable
16. Law of Conservation of Matter Matter cannot be created or destroyed. A candle burns and appears to be destroyed, but..turns into less observable gas (a byproduct).
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19. “ The use of auxiliary substances (e.g. solvents, separation agents, etc.) should be made unnecessary wherever possible, and innocuous when used”
20. Heating Cooling Stirring Distillation Compression Pumping Separation Energy Requirement (electricity) Burn fossil fuel CO 2 to atmosphere GLOBAL WARMING
24. Conclusion Green chemistry Not a solution to all environmental problems But the most fundamental approach to preventing pollution.
25. Summary Summary • Green Chemistry provides a technical solution to many environmental problems • Effective due to design stage efforts, starting at the molecular level lets you design out the hazardous properties and design in environmentally appropriate features. • A systematic approach can ensure effective application. • Why Green Chemistry? Because we can….
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