US 12,577,366 B2 · Catalysts and method for producing recycled polyester

Catalysts and method for producing recycled polyester

AssigneesPetroleo Brasileiro S.A. - Petrobras, Universidade Federal Do Rio De Janeiro - Ufrj, Universidade Federal de Pernambuco—UFPE

InventorsWellington De Oliveira Da Silva, Stevie Hallen Lima, Marcos Lopes Dias, Lys Sirelle, Jose Geraldo De Andrade Pacheco Filho, Jacicleide Nascimento De Andrade, Hezrom Saulo Do Nascimento Júnior, Daniela Emilia Bastos Lopes, Ana Paula Cipriano De Arcanjo, Aline Machado De Castro

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Abstract

The present invention describes the preparation of heterogeneous catalysts of mixed oxides based upon niobium and mixed oxides of zinc, manganese, nickel, cobalt and/or aluminum, originating from hydrotalcites (HTs) as precursor phase of heterogeneous catalysts, and application thereof in the chemical recycling of poly(ethylene terephthalate) (PET) for the production of metal free bis(hydroxy)ethylene (BHET) monomers and oligomers having a processing performance similar to that of the homogeneous catalysis system.

Claims3

Dependent claims

A catalyst for the obtainment of recycled polyester, comprising the following general formulas:

(Zn0.67Mn0.33)(1-x)Alx(OH)2(CO3)x/2.mH2O (II);
(NiaMnb)(1-x)Alx(OH)2(An−)x/n.mH2O (IV);
(ZnaMnb)(1-x)Alx(OH)2(An−)x/n.mH2O (V);
and
(Co0.67Mn0.33)(1-x)Alx(OH)2(CO3)x/2.mH2O (VII),
wherein
0.2≤x≤0.5,
0.1≤a/b≤5,
An−=anion of compensation, which may be carbonate, terephthalate or another anion, and
m=1−(3/2)x+0.125.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/275,856Filed 12 Sep 2019

Priority

BR 102018068454-012 Sep 2018

Published

US 2022/0041836 A110 Feb 2022

Granted

17 Mar 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification27 codes

C08J 11/16
By chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation: by treatment with inorganic material
C08J 11/26
By treatment with organic oxygen-containing compounds: containing carboxylic acid groups, their anhydrides or esters
B01J 23/002
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: mixed oxides other than spinels, e.g. perovskite
B01J 23/007
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: mixed salts