Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Catalysts and method for producing recycled polyester

A catalyst and recycling technology, applied in the field of diethylene, can solve the problems of no reported PET chemical recycling method, etc., and achieve the effect of promoting processing economy, high value, and remarkable economy.

Active Publication Date: 2021-07-30
PETROLEO BRASILEIRO SA (PETROBRAS) +2
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other than that, there is no indication of the activity of niobium phosphate as a glycolysis catalyst with ethylene glycol for obtaining BHET
[0011] From the above, it follows that there are no reports in the prior art of mixed oxides based on niobium and mixed oxides of zinc, manganese, nickel, cobalt and / or aluminum expected to originate from hydrotalcite (HT) as a precursor phase for heterogeneous catalysts. There are no heterogeneous catalysts for PET, and no PET chemical recycling process using such catalysts has been reported for the production of metal-free BHET monomers and oligomers.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalysts and method for producing recycled polyester
  • Catalysts and method for producing recycled polyester
  • Catalysts and method for producing recycled polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Embodiment 1: ZnAl catalyst

[0098] exist figure 1 The results of PET depolymerization for subsequent repolymerization performed on a large scale in a Parr reactor are shown in . In the batch tests (Tests 1 and 2) with mixed oxide catalysts derived from the hydrotalcite precursor phase HT-ZnAl, good reproducibility was noted. For pristine mixed oxides (tests 1 and 2), after 1 h of reaction, starting from 40 g of PET, the average conversion was 99.7±0.1% (average of tests 1 and 2). For the recycled catalyst system (PET conversion = 76.89%), the same catalyst as used in Test 2 was used, but recovered and utilized in another reaction without any regeneration process. Even though it was not regenerated, the catalyst still proved to be active in the depolymerization reaction, although its catalytic activity showed about 22% drop. exist figure 2 displayed in figure 1 The molar yield results of the tests. The amount of BHET oligomers and monomers obtained differed be...

Embodiment 2

[0099] Example 2: ZnMnAl catalyst for glycolysis of PET and fibers from polyester ropes

[0100] exist image 3 A diagram showing the conversion of PET to BHET by a catalyst of the mixed oxide type obtained from the HT-ZnMnAl precursor phase in which manganese is incorporated in the structure of ZnAl is shown in . The virgin mixed oxide and the reused oxide (recycled catalyst) exhibit practically the same conversion. It is important to emphasize that in this case the catalyst recovered from Test 1 was used for further PET depolymerization, but without the heat treatment of drying and calcination, and complied with the same PET / CAT ratio. It can be observed that when the results of the recycled catalyst are compared with those of the virgin catalyst (Test 1), the results for the conversion of PET to BHET are perfectly reproduced (100% in Test 1, whereas in the recycled catalyst is 99.9%). It is important to emphasize that after conducting Test 1, the catalyst retained on the...

Embodiment 3

[0107] Example 3: NiAl and NiMnAl oxide catalysts for PET glycolysis

[0108] Add 25 ml of ethylene glycol, 5 g of PET and 25 mg of catalyst to a reaction vessel of perfluoroalcoixide wrapped in a metal coating, which is pre-heated at 10 ° C for min -1 Calcined at a rate from ambient temperature to 350 °C and held at this temperature for 3 hours. The system was maintained at ambient temperature for 18 hours for pre- and extended exposure purposes of the reagents. Thereafter, the reaction vessel was heated at 20°C for min -1 Heat at a rate of 200 °C and maintain at final temperature for 1 h under mechanical stirring and autogenous pressure. The listed conditions were achieved using a Mars Synthesis Model 6 microwave reactor from CEM Corporation with temperature control and pressure readout. This phase was divided into two phases: firstly, a Ni catalyst screening test phase, with the aim of optimizing and testing the catalyst exhibiting the maximum conversion. The second sta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

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

Description

technical field [0001] This invention relates to the production of recycled polyesters using heterogeneous catalysts. More specifically, the present invention relates to the preparation of non-isotropic compounds based on mixed oxides of niobium and mixed oxides of zinc, manganese, nickel, cobalt and / or aluminum derived from hydrotalcite (HT) as a precursor phase for heterogeneous catalysts. Homogeneous catalysts, and their use in the chemical recycling of polyethylene terephthalate (PET), for the production of metal-free bis(hydroxy)ethylene (BHET) monomers and oligomers, and Has similar processability to homogeneous catalytic systems. Background technique [0002] Polyethylene terephthalate (PET) is a product widely used in the industrial manufacture of bottles and high-strength fibers. Due to this demand, the production of post user PET is currently increasing dramatically all over the world, especially due to the increased demand for PET containers. [0003] In additi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/22C08J11/24C07C63/26C08G63/183C08G63/83
CPCB01J21/02B01J23/06B01J23/34B01J23/74B01J23/745B01J23/75B01J23/755B01J23/8892C08K3/22C08G63/183C08G63/83Y02W30/62C08J11/16C08J2367/02C08J11/24B01J35/023B01J2523/00B01J23/007C08G63/84C07C67/03B01J2523/31B01J2523/72B01J2523/845C07C69/82B01J23/002B01J23/20C07C67/02C08J11/26
Inventor W·德奥利维拉达席尔瓦S·哈伦利玛M·洛佩斯戴亚斯L·西雷尔J·G·德安德拉德帕切科菲尔赫J·纳茨门托德安德拉德H·S·小多纳茨门托D·E·巴斯托斯洛佩斯A·P·西普里亚诺德阿尔坎若A·马查多德卡斯特罗
Owner PETROLEO BRASILEIRO SA (PETROBRAS)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com