Understand waste prevention, atom economy formulas, non-toxic solvents (supercritical CO2), and sustainable industrial processes.
Green Chemistry (Sustainable Chemistry) focuses on designing chemical products and manufacturing processes that reduce or eliminate the generation of hazardous substances. It is an increasingly prominent topic in modern environmental science curricula.
The 12 Principles of Green Chemistry: Key principles include Waste Prevention (better to prevent waste than to treat it), Atom Economy (maximizing reactant atom incorporation into final product), Less Hazardous Chemical Synthesis, Safer Solvents and Auxiliaries, Design for Energy Efficiency, and Use of Renewable Feedstocks.
Atom Economy Calculation: Atom Economy (%) = (Formula Weight of Desired Product / Total Formula Weight of All Reactants) * 100. Addition reactions (e.g., hydrogenation, Diels-Alder) exhibit 100% atom economy, whereas substitution and elimination reactions generate stoichiometric by-products.
Real-World Green Innovations: Using supercritical CO2 as an eco-friendly dry-cleaning solvent instead of toxic tetrachloroethene (PERC); replacing chlorine bleaching in paper manufacturing with Hydrogen Peroxide (H2O2). Dr. Aarzoo Saini incorporates green chemistry case studies at We-Gyaan Classes.
Key Takeaways for Students
- Calculate chemical process Atom Economy to evaluate synthetic efficiency.
- Differentiate high-atom-economy addition reactions from low-efficiency substitution pathways.
- Identify green solvents such as supercritical Carbon Dioxide and ionic liquids.
- State industrial examples of green chemistry in bleaching, dry cleaning, and polymer synthesis.
Authored by Dr. Aarzoo Saini
Founder & Lead Educator at We-Gyaan Classes Roorkee, with over 15 years of teaching excellence in Science and Chemistry for Board Exams, NEET, JEE, and CUET.