Dianols (etherified derivatives of bis-phenol-A) and bis-phenol-A (BPA) itself were efficiently obtained from waste polycarbonate (PC) via a fast catalytic hydrolysis/glycolysis process using microwave heating. A complete conversion of waste PC was achieved using a microwave power of 3 kW in a very short time (10 min). A mixture of BPA, mono- and dianols were obtained working with a basic catalyst and ethylene glycol as solvent. This mixture was selectively converted into dianol 220 (2,2'-((propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis (ethan-1-ol) )using diethyl carbonate. Furthermore several dianols were obtained through a more eco-friendly process through hydrolysis in the appropiate diol as solvent and Na2CO3 as catalyst followed by a one-pot etherification with urea, zinc oxide and a microwave heating for 15 min. On the contrary using THF/H2O as solvent and KOH as catalyst, PC was hydrolysed to BPA with high selectivity (80.6 wt%).
Synthesis of Dianols or BPA through catalytic hydrolyisis/glycolysis of waste polycarbonates using a microwave heating / Rosi, L.; Bartoli, M.; Undri, A.; Frediani, M.; Frediani, P.. - In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL. - ISSN 1381-1169. - STAMPA. - 408:(2015), pp. 278-286. [10.1016/j.molcata.2015.07.027]
Synthesis of Dianols or BPA through catalytic hydrolyisis/glycolysis of waste polycarbonates using a microwave heating
ROSI, LUCA;BARTOLI, MATTIA;UNDRI, ANDREA;FREDIANI, MARCO;FREDIANI, PIERO
2015
Abstract
Dianols (etherified derivatives of bis-phenol-A) and bis-phenol-A (BPA) itself were efficiently obtained from waste polycarbonate (PC) via a fast catalytic hydrolysis/glycolysis process using microwave heating. A complete conversion of waste PC was achieved using a microwave power of 3 kW in a very short time (10 min). A mixture of BPA, mono- and dianols were obtained working with a basic catalyst and ethylene glycol as solvent. This mixture was selectively converted into dianol 220 (2,2'-((propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis (ethan-1-ol) )using diethyl carbonate. Furthermore several dianols were obtained through a more eco-friendly process through hydrolysis in the appropiate diol as solvent and Na2CO3 as catalyst followed by a one-pot etherification with urea, zinc oxide and a microwave heating for 15 min. On the contrary using THF/H2O as solvent and KOH as catalyst, PC was hydrolysed to BPA with high selectivity (80.6 wt%).File | Dimensione | Formato | |
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