Green Chemistry Milan Sanader Author, Nelson Chemistry.

Green Chemistry

Milan SanaderAuthor,

Nelson Chemistry

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

A GREEN CHEMICAL PROCESS IS

“benign by design”

Principles of Green Chemistry

Preventing pollution makes more sense that treating it

Less toxic reagents are safer

Use less solvents

Design for energy efficiency

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

Less Hazardous Chemical Syntheses

Reduce Derivatives

Design for Degradation

Real-time analysis for Pollution Prevention

EXAMPLES OF GREEN CHEMISTRY

Safer dry cleaning

Replace chlorinated solvents like perchloroethylene (perc) with liquid carbon dioxide (CO2)

Reduction in solvent from 1300 L/kg to 7 L/kg

Elimination of the solvent dichloromethane, CH2Cl2

VIAGRA SYNTHESIS

IBUPROFEN SYNTHESIS

Boot’s synthesis 6 steps Atom economy: 40% (40% of atoms in raw

materials end up in product)

BHC synthesis 3 steps Catalysts Atom economy >90%

Battery Recycling

Tonolli Canada

Flash Smelting

Features:

Smelting occurs in an enriched oxygen atmosphere

Exothermic reactions fuel the smelter

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

Green Chemistry Is About...

Waste

Materials

Hazard

Environmental Impact

COST

Risk

Energy

Some Aspects of Green Chemistry

Catalysis

Process

Intensification

Separation

Processes

Energy

Efficiency

Solvent

Replacement

Safer Reactions

& Reagents

Use of

Renewable

Feedstocks

Waste

Minimisation

Green

Chemistry

IN SUMMARY,GREEN CHEMISTRY IS…

• Based on proven chemistry • Cost effective• More sustainable

= A “win-win” for business and the environment