By J.H. Clark, J. Aguado, D. Serrano
Examines the conversion of plastic wastes into precious chemical compounds important as fuels or uncooked fabrics. Describes the choices in components together with chemical deploymerization, thermal approaches, oxidation and hydrogenation.
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Extra info for Feedstock Recycling of Plastic Wastes
L4 Consumers and industries are encouraged to promote the reuse of goods and packaging instead of disposal. This option can be applied especially for containers such as bottles, bags, etc. Recycling. This allows the wastes to be reintroduced into the consumption cycle, generally in secondary applications because in many cases the recycled products are of lower quality than the virgin ones. Recycling must be applied only when the amount of energy consumed in the recycling process is lower than the energy required for the production of new materials.
Gebauer, Proceedings of Recycle '94, Davos, Switzerland, 1994. W. Meszaros, Proceedings of Recyclingplas VI '91, Washington, 1991, p. 335. 22 J. Burgiel, W. Butcher, R. Halpern, D. Oliver, P. W. R. Kirk, 'Cost Evaluation of Automated and Manual Post-consumer Bottle Sorting Systems', United States Environmental Protection Agency, Cincinnati, 1994. 23 K. Saitoh and S. Izumi, US Patent 4 132 633, 1979. J. R. Sehlmeyer, US Patent 4 167 111, 1986. J. Beckman, US Patent 5 126 058, 1992. B. C. Lynch, US Patent 5 198 471, 1993.
Interestingly, the colour of the polyester product is not affected by the addition of this high proportion of PET wastes. Methanolysis PET methanolysis is based on the treatment of PET with methanol at relatively high temperatures (180-280 "C) and pressures (20-40 atm), which leads to the formation of dimethyl terephthalate (DMT) and ethylene glycol as the main The reaction proceeds usually in the presence of typical transesterification catalysts, the most widely used being zinc acetate. Other catalysts employed in PET methanolysis are magnesium acetate, cobalt acetate and lead dioxide.