Pregled bibliografske jedinice broj: 152371
Glycolysis and hydrolysis : methods for chemical recycling of poly(ethylene terephthalate)
Glycolysis and hydrolysis : methods for chemical recycling of poly(ethylene terephthalate) // Matrib 2004 : zbornik radova = conference proceedings / Grilec, Krešimir (ur.).
Zagreb: Hrvatsko društvo za materijale i tribologiju (HDMT), 2004. (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
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Naslov
Glycolysis and hydrolysis : methods for chemical recycling of poly(ethylene terephthalate)
Autori
Kratofil, Ljerka ; Čović, Ivana ; Hrnjak-Murgić, Zlata ; Jelenčić, Jasenka
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Matrib 2004 : zbornik radova = conference proceedings
/ Grilec, Krešimir - Zagreb : Hrvatsko društvo za materijale i tribologiju (HDMT), 2004
Skup
International Conference Matrib 2004
Mjesto i datum
Vela Luka, Hrvatska, 23.06.2004. - 25.06.2004
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
poly(ethylene-terephthalate); chemical recycling; glycolysis; alkali depolymerization
Sažetak
In this study we focused our attention on the chemical recycling of poly(ethylene terephthalate), PET. Chemical recycling can result in total depolymerization to the monomers or in partial depolymerization to the oligomers. Methods used in our study were glycolysis and hydrolysis. Glycolysis and hydrolysis reactions were carried out at two different temperatures: 170 °C and 190 °C and with two molar ratios of PET and ethylene glycol, EG: 1:5 and 1:18. Increased temperature and higher molar ratio of EG significantly enlarge the rate of PET depolymerization but drawback is higher expense of recycling. After each process the reaction mixture was analyzed for sodium terephthalate (Na2TPA), bis (2-hydroxy ethyl)terephthalate (BHET), EG and for intermediates that are dimers, trimers and oligomers. Thus, their separation was necessary as they are soluble or insoluble in boiling water. The obtained fractions were water soluble crystallizable fraction (WSCF) and water insoluble fraction (WIF). Separated components were further characterized by FTIR spectroscopy and titration of Na2TPA by HCl was carried out Obtained results show that the glycolysis and hydrolysis are efficient ways for chemical recycling of PET. These results also suggest that hydrolysis of PET catalyzed by NaOH is more promising process for chemical recycling of post consumer PET bottles.
Izvorni jezik
Engleski
Znanstvena područja
Kemijsko inženjerstvo
