The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 2026
Filed:
Apr. 20, 2021
Chempet S.r.l., Cerano, IT;
Guido Fragiacomo, Novara, IT;
Gianluigi Noja, Novara, IT;
Devis Luigi Mazzucco, Vigevano, IT;
Marco Casarotti, Galliate, IT;
Chempet S.r.l., Cerano, IT;
Abstract
A process for depolymerizing a polyethylene terephthalate (PET) by glycolysis with ethylene glycol (EG) is described. Also described is a plant for carrying out the process. The PET is first mixed in the solid state with EG at a temperature of 60-120° C. to form a heterogeneous mixture with an EG:PET weight ratio of 0.1-3.0, and is then pressed to squeeze out an aliquot of EG. The compressed mixture is fed to a reactor, where the mixture is heated and kept under mixing at a temperature of 170-270° C., with an EG:PET weight ratio of 0.1-4.0, to glycolize the PET and obtain a glycolyzed product containing bis(2-hydroxyethyl) terephthalate and/or oligomers thereof. The process is advantageous in treating waste PET as such and reducing the EG to PET ratio necessary for glycolysis that allows the reaction to be carried out at relatively high temperatures of 230° C. and above to expedite the process.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile