Sodium titanium tris(glycolate) as a catalyst for the chemical recycling of poly(ethylene terephthalate) via glycolysis and repolycondensation

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

“…The sign around of 2.5 ppm is DMSO and in 3.3 and 2.0 ppm can be attributed to H 2 O residual and contamination. 9,31,36 The 13 C-NMR spectrum of BHET is shown in Figure 8 with chemical structure illustration.…”

“…Among these variables, the catalyst type can dramatically influence the reaction conditions such as low temperature and reaction time. Recently various transition metal-based catalysts with good catalytic activities on PET glycolysis have been described in literature, the most used among them being zinc acetate 7,8 , but they have limitations such as difficult synthesis of the catalyst 1,9 or catalyst toxicity or corrosivity, resulting in pollution 10 . Thus, the search for new highly selective catalysts under mild conditions is required 3 .…”

Organocatalysis for versatile polymer degradation

“…[32][33][34][35][36] Poly (ethylene terephthalate) (PET) can be chemically depolymerised into ethylene glycol (EG) and either bis(2-hydroxyethyl)terephthalate (BHET) or dimethyl terephthalate (DMT) by glycolysis or methanolysis respectively. [37][38][39][40][41][42][43] The recovery of these monomers can allow for direct repolymerisation to PET of the same quality. 39,44 PET can also be degraded by aminolysis yielding a range of amides which can be used as additives to other plastics.…”

“…[37][38][39][40][41][42][43] The recovery of these monomers can allow for direct repolymerisation to PET of the same quality. 39,44 PET can also be degraded by aminolysis yielding a range of amides which can be used as additives to other plastics. 45 Chemical recycling of polyesters is typically achieved by a transesterification reaction performed by metal complexes or oxide catalysts.…”

Oligoester and Polyester Production via Acido-alcoholysis of PET Waste

“…Thus a wide range of catalysts were studied and introduced, including metal salts, ionic liquids, heterogeneous catalyst like magnetic nanoparticles and MOFs (metal-organic frameworks) to enhance BHET yield. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] High ratio of ester:alcohol (1:3-1:8) were used in these studies to shift the equilibrium to the BHET production. The reaction product was recrystallized from water or other good solvents of BHET.…”