While environmentally friendly living is a positive ideal, there are several possible disadvantages of Green processes and technology such as: high implementing costs, lack of information, no known alternative chemical or raw material inputs, no known alternative process technology, uncertainty about performance
Main topics in green chemistry.
- EFFICIENT SYNTHETIC ROUTES. Most current chemical production processes lack efficiency in using feedstocks and produce large amount of wastes.
- GREENER AND FUNCTIONAL SOLVENTS.
- GREENER CATALYSIS.
- USE OF GREEN AND RENEWABLE FEEDSTOCKS.
- GREEN ENGINEERING AND PRODUCTS.
- OUTLOOK.
Warner developed the Twelve Principles of Green Chemistry in 1991. These principles can be grouped into "Reducing Risk" and "Minimizing the Environmental Footprint."
Chemistry can help us to understand, monitor, protect and improve the environment around us. Chemists are developing tools and techniques to make sure that we can see and measure air and water pollution. They have helped to build the evidence that shows how our climate has changed over time.
At the same time, green chemistry can save companies money by reducing the need for costly chemicals, reagents and solvents, lowering insurance and legal costs, reducing waste disposal costs (which can exceed $5 per kg for some toxics), and saving energy.
1 Waste. Waste prevention is the first of the Twelve Principles of Green Chemistry. It is better to prevent the formation of waste rather than to clean it up after the fact. The generation of any material that does not have realized value or the loss of unutilized energy can be considered a waste.
Green solvents are environmentally friendly solvents, or biosolvents, which are derived from the processing of agricultural crops. Ethyl lactate, for example, is a green solvent derived from processing corn. Ethyl lactate is the ester of lactic acid.
How can you apply green chemistry for the following : (i) to control photochemical smog (ii) to avoid use of halogenated solvents in dry cleaning and that of chlorine in bleaching (iii) to reduce use of synthetic detergents. (iv) to reduce the consumption of petrol and diesel. in presence of a suitable catalyst.
Principles - historical concept of the constituents of a substance, specifically those that produce a certain quality or effect in the substance, such as a bitter principle, which is any one of the numerous compounds having a bitter taste. The idea of chemical principles developed out of the classical elements.
GREEN REAGENTS Green reagent is one that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products .
Green chemistry is also known as sustainable chemistry. It is used to design of chemical products and procedures that reduce generation of hazardous chemical substances. Green chemistry applies diagonally the life cycle of a chemical product, including its manufacture, use, design, and ultimately disposal.
- 1: Waste Prevention.
- 2: Atom Economy.
- 3: Less Hazardous Chemical Synthesis.
- 4: Designing Safer Chemicals.
- 5: Safer Solvents & Auxiliaries.
- 6: Design for Energy Efficiency.
- 7: Use of Renewable Feedstocks.
- 8: Reduce Derivatives.
Avoid unnecessary use of hazardous materials and products, seek substitutions when feasible, and take all reasonable steps to protect human health and the environment when such materials must be used, stored and disposed of. Purchase and use environmentally responsible products accordingly.
Green chemistry is not a new branch of chemistry; it is rather a thought process on existing and new tools, knowledge, and design of chemistry in a way that it contributes to the societal economy while protecting the environment and human health. It is important that chemists develop new Green chemistry options.
Green Chemistry Principle: Atom Economy. Atom economy means maximizing the incorporation of material from the starting materials or reagents into the final product. It is essentially pollution prevention at the molecular level.
Green or Sustainable Chemistry is a term that refers to the creation of chemical products and processes that reduce or eliminate the use and production of harmful substances. They are used exclusively chemicals and chemical processes that do not have negative consequences for the environment.
Reaction of methylamine and phosgene to produce MIC (methyl isocyanate) is not an example of green chemistry.
frequently asked questionsIs Green Chemistry more expensive? No. Greener chemical processes can result in a tremendous benefit to the economic bottom line. It is more expensive to use and generate hazardous chemicals due to the many costs associated with their use – disposal, regulatory, exposure controls, etc.
?Green Chemistry is the design of. chemical products and processes that reduce or eliminate the use and/or generation of hazardous substances.
