Additional steps in mechanical recyling of PET

Autor(es)

Mancini, Sandro Donnini ^[1] ; Saide Schwartzman, Jonas Age ^[1] ; Nogueira, Alex Rodrigues ^[1] ; Kagohara, Dennis Akira ^[1] ; Zanin, Maria ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Dept Environm Engn, BR-18087180 Sorocaba, SP - Brazil

^[2] Univ Fed Sao Carlos, Reg Incubator Popular Cooperat INCOOP, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CLEANER PRODUCTION; v. 18, n. 1, p. 92-100, JAN 2010.
• Citações Web of Science: 15

Resumo

This study presents the laboratory scale results of an extra step in Poly (ethylene terephthalate) - PET mechanical recycling (grinding, washing, drying and reprocessing): a chemical washing after the conventional one. Cooking oil PET bottle flakes were washed in water and then subjected to a reaction with an aqueous solution of sodium hydroxide 5 M at 90 degrees C for 10 min (chemical washing). After rinsing and drying, the flakes were characterized by thermogravimetry, gas chromatography and elemental analysis tests. The results indicated that the chemically washed material had higher purity than PET washed only with water: 99.3% and 96.7%, respectively, which undoubtedly implies properties, applications and prices closer to those of virgin resin. The production of purified terephthalic acid (TPA) from the chemical washing residue was optimized and reached a purity of 99.6%. Despite the results, the use of chemically washed PET and of TPA obtained is not recommended for direct contact with food, since they still contain some impurities. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 04/08718-9 - Desenvolvimento de processos alternativos de reciclagem de poli (tereftalato de etileno) proveniente de resíduos sólidos urbanos
• Beneficiário: Sandro Donnini Mancini
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 06/55213-5 - Otimização e reciclagem química da PET por hidrólise neutra após o aumento da hidrofilicidade do polímero por tratamento a plasma
• Beneficiário: Alex Rodrigues Nogueira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica