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The Principles Of Green Chemistry Explained

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jessie hoole

on 4 January 2013

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Transcript of The Principles Of Green Chemistry Explained

The Principles Of Green Chemistry
Explained Green Chemistry Green Chemistry

"Green chemistry is the design of chemical products and processes that reduce or eliminate the use and generation of hazardous substances" (Anastas et al. 2000).
In other words green chemistry making products that don't harm us or our environment.

The Principles of Green Chemistry

The principles of Green Chemistry are guidelines for scientists to use when designing new products
The principles are all about sustainable criteria and have ultimately been the source of innovative solutions to a lot of problems in Green chemistry Prevention
-It is better to prevent waste than to treat or clean up waste after it has been created.
-When making a product you have to consider if it causes more harm to the environment when making it then help the environment. For example lets say a scientist came up with a reusable grocery bag. The only catch was the material used to make the material was very toxic to the environment when making it. Prevention would be trying to find a material that would not be so toxic. Atom Economy
-Synthetic methods should be designed to maximize the incorporation of all materials used in the process into the final product.
-This basically means the when creating a product you have to keep in mind that you make use of everything you start with. Atom economy is the ratio of the total mass of atoms and the desired products to a total mass of atoms and the reactants. In other words the greater the atom economy the more the materials used were put into the final project. Less Hazardous Chemical Syntheses
-Wherever practicable, synthetic methods should be designed to use and generate substances that possess little or no toxicity to human health and the environment.
-When green chemists are coming up with ideas they have to keep in mind that the substance shouldn't be a danger to human health or the environment. For example if a person were to find the cure the cancer using toxic chemicals that would make you die in the next ten years verses someone to find the cure for cancer using water. Designing Safer Chemicals
-Chemical products should be designed to effect their desired function while minimizing their toxicity.
-This principles applies to a lot of products because a lot of products are not new invention but re-inventions. Green Scientist are trying to recreate essential products but without all the harsh chemicals. The chemical should be non-toxic and still achieve their desired effect. For example Cleaning products once contained harmful chemicals. In the past years scientist have made new eco friendly chemicals that work as well as the others. Safer Solvents and Auxiliaries
-The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.
-This means the that when you make a product the auxiliary processed should be non-toxic or made unessesary. Design for Energy Efficiency
-Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure.
-This means when creating a product you should try to minimize energy use in chemical processes. For example instead of 5 weak people lifting a weight one strong person would lift the weight. Use of Renewable Feedstocks
-A raw material or feedstock should be renewable rather than depleting whenever technically and economically practicable.
-When making a product you should try to use renewable fuels for machinery. The system will pollute less and will never run out. For example instead of burning coil to create energy to make the product green chemists would use solar panels. Reduce Derivatives
-Unnecessary derivatization (use of blocking groups, protection/deprotection, temporary modification of physical/chemical processes) should be minimized or avoided if possible, because such steps require additional reagents and can generate waste.
-In green chemistry scientists are always trying to cut down on waste. When making a product don't use extra steps to get to the same product. For example pouring a glass of water by getting a funnel and pouring it or just pouring it without the funnel. Catalysis
-Catalytic reagents (as selective as possible) are superior to stoichiometric reagents.
- A catalyst is a substance that accelerates a chemical reaction without being changed by the reaction. In green chemistry scientists use catalysts as much as possible. For example if I was picking out an outfit and went through ten outfits then decided on my original outfit. Verses if i called my friend (catalyst) and she chose the same outfit first. Design for Degradation
-Chemical products should be designed so that at the end of their function they break down into innocuous degradation products and do not persist in the environment.
-When making a product you have to think about how it will break down. Green Chemists say that the product should be designed to break down easily (biodegradable). For example if you were making a regular plastic they would make it out of Bio Sphere plastic. Real-time analysis for Pollution Prevention
-Analytical methodologies need to be further developed to allow for real-time, in-process monitoring and control prior to the formation of hazardous substances
-When creating a product using the principles of chemistry make sure to monitor the process to stop and detect the production of dangerous chemicals. For example when the teacher leaves a classroom and the kids make a mess, verses the teacher getting a fellow teacher to watch her class. Inherently Safer Chemistry for Accident Prevention
-Substances and the form of a substance used in a chemical process should be chosen to minimize the potential for chemical accidents, including releases, explosions, and fires.
-Green Chemists try to use safer substances to avoid accidents. For example testing an unsafe chemical to see it's boiling point might cause a reaction. Looking it up on the internet would prevent an accident. Thank you for Watching our presentation,
hope you didn't get to sick!
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