Evaluation of Accelerated Solvent Extraction (ASE) Followed by Post-condensation Step (SSP) to Extract Contaminants from PET Flakes

Aiming to reduce the overall energy consumption of PET super-clean technologies, without using hazardous and large amounts of solvents, this work deals with accelerated solvent extraction followed by solid state polymerization (ASE-SSP) as an alternative way to decontaminate recycled PET for direct...

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Bibliographic Details
Published in:Progress in rubber, plastics and recycling technology plastics and recycling technology, 2016-05, Vol.32 (2), p.73-86
Main Authors: Santos, Amélia S.F., Baraldi, Patricia T., Medeiros, Eliton S., Agnelli, José A.M., Correa, Arlene G., Manrich, Sati
Format: Article
Language:English
Subjects:
Clean technology
Condensation
Efficiency
Extraction processes
Food
Food packaging
Molecular weight
Morphology
Polymerization
Polymers
Public health
Recycling
Studies
Temperature
Volatility
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Summary:Aiming to reduce the overall energy consumption of PET super-clean technologies, without using hazardous and large amounts of solvents, this work deals with accelerated solvent extraction followed by solid state polymerization (ASE-SSP) as an alternative way to decontaminate recycled PET for direct food contact applications. The main effects of the extraction ASE parameters (temperature, flow rate and pressure) in extraction efficiency of toluene and benzophenone, used as model contaminants, from PET were evaluated using a first-order fractional experimental design. Subsequently, PET chips were submitted to a SSP process to remove residual acetone, used as the extractor solvent, from PET. Extraction yield was quantified by gas chromatography with flame ionization detector (GC-FID). Results showed that the only parameter that affects negatively the decontamination process was an increase in temperature. Moreover, the SSP process helped to remove residual acetone from PET reaching decontamination levels as high as the FDA recommendations for direct food contact packaging.
ISSN:1477-7606
1478-2413
DOI:10.1177/147776061603200202