Green Chemistry PDF
Document Details
Uploaded by RemarkableCornett
D.N.R. College (A), Bhimavaram
S.. Anil Dev
Tags
Summary
The document is a presentation about green chemistry, covering concepts, principles, methods, and advantages in a presentation format. It includes details on sonochemistry, discussing its principles and advantages. This is likely to be used as lecture notes or study material.
Full Transcript
GREEN CHEMISTY PREPARED BY S.. ANIL DEV M.Sc. LECTURER IN CHEMISTRY D.N.R.COLLEGE (A), BHIMAVARAM CONCEPT OF GREEN CHEMISTRY Sustainable development Atom efficiency Solvent selection The green chemistry concept is the idea...
GREEN CHEMISTY PREPARED BY S.. ANIL DEV M.Sc. LECTURER IN CHEMISTRY D.N.R.COLLEGE (A), BHIMAVARAM CONCEPT OF GREEN CHEMISTRY Sustainable development Atom efficiency Solvent selection The green chemistry concept is the idea of sustainability, reducing environmental impacts and conserving natural resources for future generation. BASIC PRINCIPLES OF GREEN CHEMISTRY 1. Prevention of waste or by-products 2. Atom economy 3. Synthesis of less hazardous chemicals 4. Designing of safer chemicals 5. Use of safer solvents and auxiliaries (Extra chemicals) 6. Design for energy efficiency or Minimization of energy loss 7. Use of renewable feed stock 8. Reduce derivatives 9. Use of catalytic reagents 10. Design of environmental friendly and easily degradable products. 11. Real-time analysis for pollution and prevention 12. Inherently safer chemistry for accident prevention METHODS OF GREEN SYNTHESIS Microwave irradiation Hydrothermal synthesis Ultra sound-assisted (sono chemical) synthesis Solvents and catalysis in green processes ADVANTAGES OF GREEN SYNTHESIS It is cost-effective, non-toxic, robust and easy to manage. SONO CHEMISTRY It is the study of effects of ultra sound on chemical activity of a reaction mixture. Use of ultrasound in organic synthesis is called sonification and the subject is called sono chemistry. SONICATION The processes of applying sound energy for agitate particles or discontinuous fibers in a liquid. Ultra sonic frequencies (> 20 kHz) are usually used. So the process is also known as Ultra sonication. BASIC PRINCIPLE OF SONICATOR When low pressure is applied to the liquid, high intensity ultrasonic waves are produced, creating small vacuum bubbles in the liquid. As the bubbles reach their saturation level, they collapse and this happens in the high pressure cycle. Or The interaction pressure waves (ultrasound) with a liquid medium leads to the formation of cavities in liquid. ADVANTAGES OF SONICATION METHOD It is clean, economical, efficient and safe procedure. This can lead save time, energy and money. Very rapid reactions, frequently in few minutes. Higher degree of purity achieved. Workup procedure is very simple.
