Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 149, Issue 3, Pages 536-542Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2007.06.076
Keywords
polymer recycling; polyethylene; polypropylene; dissolution/reprecipitation; pyrolysis
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The recycling of either model polymers or waste products based on low-density polyethylene (LDPE), high-density polyethylene (HDPE) or polypropylene (PP) is examined using the dissolution/reprecipitation method, as well as pyrolysis. In the first technique, different solvents/non-solvents were examined at different weight percent amounts and temperatures using as raw material both model polymers and commercial products (packaging film, bags, pipes, food-retail outlets). The recovery of polymer in every case was greater than 90%. FT-IR spectra and tensile mechanical properties of the samples before and after recycling were measured. Furthermore, catalytic pyrolysis was carried out in a laboratory fixed bed reactor with an FCC catalyst using again model polymers and waste products as raw materials. Analysis of the derived gases and oils showed that pyrolysis gave a mainly aliphatic composition consisting of a series of hydrocarbons (alkanes and alkenes), with a great potential to be recycled back into the petrochemical industry as a feedstock for the production of new plastics or refined fuels. (C) 2007 Elsevier B.V. All rights reserved.
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