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green chemistry

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noura sayed

on 3 December 2012

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Transcript of green chemistry


* Waste Minimisation at Source
* Use of Catalysts in place of Reagents
* Using Non-Toxic Reagents
* Use of Renewable Resources
* Improved Atom Efficiency
* Use of Solvent Free or Recyclable Environmentally *Benign Solvent systems Green Chemistry
Green Chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products . Why do we need Green Chemistry ? It is better to prevent waste than to treat or cleanup waste after it is formed” Introduction Global Change Concerns for climate change, oceanic temperature, stratospheric chemistry and global distillation can be addressed through the development and implementation of green chemistry technologies Also Reducing :-
* waste * materials
* hazard * Risk
* Energy * Cost * One of green chemistry’s greatest strengths is the ability to design for reduced hazard.
* mistry is undeniably a very prominent part of our daily lives.
* Chemical developments also bring new environmental problems and harmful unexpected side effects, which result in the need for ‘greener’ chemical products. * Green chemistry looks at pollution prevention on the molecular scale and is an extremely important area of Chemistry .
* The Green Chemistry supports the invention of more environmentally friendly chemical processes which reduce the generation of hazardous substances.
* This program works very closely with the twelve principles of Green Chemistry. Chemical Process Heating
Cooling
Stirring
Distillation
Compression
Pumping
Separation Energy Requirement
(electricity) Burn fossil fuel CO2 to
atmosphere GLOBAL WARMING Resource Depletion Renewable resources can be made increasingly viable technologically and economically through green chemistry. * Biomass * Nanoscience
* Carbon dioxide * Solar The major uses of GREEN CHEMISTRY * Energy
* Global Change
* Resource Depletion
* Food Supply
* Toxics in the Environment Food Supply Green chemistry is developing:

* Pesticides which only affect target organisms and degrade to innocuous by-products.
* Fertilizers and fertilizer adjuvants that are designed to minimize usage while maximizing effectiveness.
* Methods of using agricultural wastes for beneficial and profitable uses. While current food levels are sufficient, distribution is inadequate
Agricultural methods are unsustainable
Future food production intensity is needed.
Green chemistry can address many food supply issues Toxics in the Environment Substances that are toxic to humans, the biosphere and all that sustains it, are currently still being released at a cost of life, health and sustainability. Pollution Prevention Hierarchy Prevention & Reduction Recycling & Reuse Treatment Disposal Increasing Greenness Conclusion Green chemistry Not a solution to all environmental problems But the most fundamental approach to preventing pollution. The vast majority of the energy generated today is from non-renewable sources that damage the environment.
* Carbon dioxide
* Depletion of Ozone layer
* Effects of mining, drilling, etc
* Toxics Energy Green Chemistry will be essential in

developing the alternatives for energy generation (photovoltaics, hydrogen, fuel cells, biobased fuels, etc.) as well as

continue the path toward energy efficiency with catalysis and product design at the forefront. DEFINITION GREEN CHEMISTRY IS ABOUT Thank you b2a :D Analytical Chemistry Department
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