By J.H. Clark, J. Aguado, D. Serrano
Examines the conversion of plastic wastes into beneficial chemical substances worthy as fuels or uncooked fabrics. Describes the choices in parts together with chemical deploymerization, thermal strategies, oxidation and hydrogenation.
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Additional resources for Feedstock Recycling of Plastic Wastes
5 C. Hadjilambrinos, Environ. , 1996,23(4), 298. R. Fried, ‘Polymer Science and Technology’, Prentice Hall PTR, Englewood Cliffs, New Jersey, 1995. L. S. Fulton, in ‘Ullman’s Encyclopedia of Industrial Chemistry’, Vol. 21, ed. W. Gerhartz, B. Elvers, M. F. Rounsaville, and G. Schulz, VCH Verlagsgesellschaft, Weinheim, 1993, p. 48 1. 8 C. Roy and J. Unsworth, in ‘Pyrolysis and Gasification’, ed. L. Ferrero, K. Maniatis, A. V. Bridgwater, Elsevier Applied Science, London, 1989. 9 F. Dawans, Rev. I.
Taking into account the cost and difficulty of plastic separation, several initiatives have recently been adopted to make these operations easier. A new concept of recycling is gradually being introduced, based on rethinking the entire life cycle of a product, in order to develop products that have a lesser effect on the environment. If recycling is considered from the beginning of the design process, a number of actions could be taken to favour product recycling:28 Design for easy product disassembly, especially when using multiple materials in the same object.
According to Nauman and Lynch,26a mixture of PS, LDPE, HDPE, PP, PVC and PET can be separated by fractional dissolution in xylene. As the solvent temperature is increased, progressive dissolution of these resins occurs as follows: PS (room temperature), LDPE (75"C), HDPE (105 "C), PVC (138 "C), whereas PET remains in the residue. Several spectroscopic techniques have been found to be useful in the identification and separation of plastic goods such as X-ray fluorescence, IR and ultraviolet spectroscopies, etc.
Feedstock Recycling of Plastic Wastes by J.H. Clark, J. Aguado, D. Serrano