They are preferable to stoichiometric reagents, which are used in excess and work only once. Catalysts are used in small amounts and carry out a single reaction many times. Use catalysts, not stoichiometric reagents: minimize waste by using catalytic reactions.Renewable feedstocks are often made from agricultural products or are the wastes of other processes depleting feedstocks are made from fossil fuels (petroleum, natural gas, or coal) or are mined.
Use renewable feedstock: use raw materials and feedstock that are renewable, rather than depleting.Design less hazardous chemical syntheses: design syntheses to use and generate substances with little or no toxicity to humans and the environment.Design safer chemicals and products: design chemical products to be fully effective, yet have little or no toxicity.Prevent waste: design chemical syntheses to prevent waste, leaving no waste to treat or clean up.Issues with the extensive use of fossil-based raw materials and large amounts of reagents that are of environmental concern, in addition to the accumulation of polymeric materials in the environment, gives scientists and engineers the responsibility to re-examine the polymerization process in light of the 12 principles of green chemistry. As a mature and versatile field, the polymer industry plays a significant role in our society as polymers have become ubiquitous. The development of sustainable technologies has been dealt with in several ways, one of which is the application of the principles of green chemistry to various processes. Sustainability refers to the ability to meet current needs without putting in jeopardy the ability of future generations to meet their own needs.