Green Chemistry

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Green Chemistry

• Milan Sanader
• Author,
• Nelson Chemistry

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GREEN CHEMISTRY INVOLVES

• Reducing or eliminating the use or production of
  hazardous substances in the manufacture of
  chemical products
• Considering the hazards of reagents as well as
  their properties

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A GREEN CHEMICAL PROCESS IS
benign by design
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Principles of Green Chemistry

• Preventing pollution makes more sense that
  treating it
• Less toxic reagents are safer
• Use less solvents
• Design for energy efficiency

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• Use Renewable Feedstocks
• Design Safer Chemicals
• Use catalysis rather than stoichiometric reagents
• Improve atom economy
• of atoms in raw materials than make it into
  the final product

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• Less Hazardous Chemical Syntheses
• Reduce Derivatives
• Design for Degradation
• Real-time analysis for Pollution Prevention

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EXAMPLES OF GREEN CHEMISTRY

• Safer dry cleaning
• Replace chlorinated solvents like
  perchloroethylene (perc) with liquid carbon
  dioxide (CO2)

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VIAGRA SYNTHESIS

• Reduction in solvent from 1300 L/kg to 7 L/kg
• Elimination of the solvent dichloromethane,
  CH2Cl2

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Ibuprofen Synthesis

• Boots synthesis

• BHC synthesis

• 6 steps
• Atom economy 40
• (40 of atoms in raw materials end up in product)

• 3 steps
• Catalysts
• Atom economy gt90

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Battery Recycling

• Tonolli Canada

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(No Transcript)
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Flash Smelting

• Features

• Smelting occurs in an enriched oxygen atmosphere
• Exothermic reactions fuel the smelter

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Flash Smelting

• Reduced fuel consumption
• Energy released fuels the reaction
• High yield of sulfur oxides enough to make the
  conversion to sulfuric acid economically feasible
• Use of scrubbing is minimized or eliminated

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Green Chemistry Is About...
Waste
Materials
Hazard
Reducing
Risk
Energy
Environmental Impact
COST
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Some Aspects of Green Chemistry
Catalysis
Safer Reactions Reagents
Solvent Replacement
Separation Processes
Green Chemistry
Use of Renewable Feedstocks
Energy Efficiency
Waste Minimisation
Process Intensification
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IN SUMMARY,GREEN CHEMISTRY IS

• Based on proven chemistry
• Cost effective
• More sustainable
• A win-win for business and the environment