Jun 23 2008
Background
Green Chemistry and Metathesis
Hazardous Waste Reduction
U.S EPA Presidential Green Chemistry Challenge
Background
Green chemistry is not a particular set of technologies, but rather an emphasis on the design of chemical products and processes. Sometimes, green chemistry takes place at the molecular level to reduce or eliminate the use and generation of hazardous substances. This approach offers environmentally beneficial alternatives to more hazardous chemicals and processes, and thus promotes pollution prevention.
Green Chemistry and Metathesis
Green chemistry can lead to dramatic changes in how we interact with chemicals on a daily basis as in the case of the 2005 Nobel Prize in Chemistry for the development of the metathesis method in organic synthesis. "The word metathesis means 'change-places'. In metathesis reactions, double bonds are broken and made between carbon atoms in ways that cause atom groups to change places. This happens with the assistance of special catalyst molecules. Metathesis can be compared to a dance in which the couples change partners...Metathesis is used daily in the chemical industry, mainly in the development of pharmaceuticals and of advanced plastic materials. Thanks to the Laureates' contributions, synthesis methods have been developed that are
- more efficient (fewer reaction steps, fewer resources required, less wastage)
- simpler to use (stable in air, at normal temperatures and pressures)
- environmentally friendlier (non-injurious solvents, less hazardous waste products).
Hazardous Waste Reduction
This represents a great step forward for 'green chemistry', reducing potentially hazardous waste through smarter production. Metathesis is an example of how important basic science has been applied for the benefit of man, society and the environment."
U.S EPA Presidential Green Chemistry Challenge
The U.S EPA Presidential Green Chemistry Challenge promotes and recognizes outstanding chemical technologies that incorporate the principles of green chemistry into chemical design, manufacture, and use. It recognizes chemical development that has been or can be used by industry in achieving their pollution prevention goals. Past award winners' achievements have included the development of alternative coatings, Surfactants are wetting agents that lower the surface tension of a liquid, allowing easier spreading, and lower the interfacial tension between two liquids and fire extinguishing agents.
Source: California Department of Toxic Substances