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An Oxalate‐Bridged Binuclear Iron(III) Ionic Liquid for the Highly Efficient Glycolysis of Polyethylene Terephthalate under Microwave Irradiation
Author(s) -
Cot Sergi,
Leu Meike K.,
Kalamiotis Alexis,
Dimitrakis Georgios,
Sans Victor,
de Pedro Imanol,
Cano Israel
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900075
Subject(s) - ionic liquid , polyethylene terephthalate , chemistry , depolymerization , oxalate , catalysis , polyethylene , polymer chemistry , organic chemistry , inorganic chemistry , materials science , composite material
An oxalate‐bridged binuclear iron(III) ionic liquid combined with an imidazolium based cation, (dimim) 2 [Fe 2 Cl 4 (μ‐ox)], was synthesized and characterized by a wide range of techniques. This halometallate ionic liquid was active in catalyzing the depolymerization of polyethylene terephthalate (PET) by glycolysis, under conventional and microwave‐assisted heating conditions. Both methodologies were very selective towards the production of bis(2‐hydroxyethyl)terephthalate (BHET). The employment of microwave heating proved beneficial in terms of time and energy saving when compared to the use of thermal heating. Indeed, dielectric spectroscopy studies revealed that the binuclear iron‐containing ionic liquid exhibits an excellent heating response under an electromagnetic field. The catalyst provided quantitative conversions to BHET in the glycolysis of post‐consumer PET bottles in only 3 h through microwave heating, as compared to 80 % conversion after 24 h under conventional heating.