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PET can be recycled thanks to a wide variety of methods: melt reprocessing, molecule break down (de-polymerisation), purification and re-polymerisation as well as energy recovery. Plastics recovery systems are prioritised according to their effectiveness in given situations. The table below illustrates which factors must be taken into consideration when selecting a process:

Purity

Although the term purity depends on specific requirements, contamination is generally divided into three main categories: physical contamination (macroscopic level), physical contamination (microscopic level) and chemical contamination.

Macroscopic physical contamination of a PET batch includes easy-to-remove dirt, glass fragments, stones, grit, soil, paper, glues, product residues and other plastics like PVC and PE. On the other hand, ingrained soil caused by abrasion or grinding (due to baling, transport or handling in poor storage conditions) is difficult to dislodge and needs thorough filtration to ensure its removal.

Physical contamination at a microscopic level is more difficult to remove, especially if partially bound (like glues) or embedded by abrasion or impacting. Such impurities create “weak spots” and lead to production problems during reprocessing like, for example, excessive breaks in fibre spinning. The consequence is a loss of quality and productivity.

Chemical contamination occurs by adsorption of flavourings, essential oils, etc. used in the formulations of the container’s content. Chemical contamination can also be due to an emptied container being re-used for purposes other than the original one. Storing pesticides, household chemicals or motor and fuel oils in beverage containers leads to chemical contamination. Complete removal requires “desorption”, a slow process that entails a decrease in productivity. These occurrences are rare. For low risk applications, like non-food contact fibres, incidental product contamination is quite insignificant.

Mechanical Recycling

Mechanical recycling of PET bottles requires washing and grinding of recovered material. The resulting flakes are then either processed as such or are first blended with virgin polymer.

The degree of purity of recovered material is of paramount importance in the mechanical recycling process. Indeed, very small quantities of PVC can cause material degradation and, during reprocessing, can even damage equipment.

The acceptable PVC level in a PET stream is a mere 0.25%. Nowadays, automated, sophisticated bottle sorting equipment allows excellent separation of PET from other plastics.

Chemical Recycling

Chemical recycling is another established method for recovering reclaimed post-consumer waste. However, with equipment costs being high, it requires large turnovers to be economically viable.

The various chemical recycling techniques are: glycolysis, methanolysis, hydrolysis, saponification and pyrolysis. The selection of the appropriate process depends on the quality of the reclaimed input material. For example, glycolysis and methanolysis are unable to remove colours added to PET feedstreams during their original formulation. These therefore require additional purification.

Glycolysis

Recovered PET is made to react (under pressure at 200°C) with excess ethylene glycol. This reverses the polymerisation reaction to give bishydroxyethylterephthalate (BHET) and short chain polymers with just a few repeat units. The BHET is then purified under pressure by melt filtration (to remove physical impurities), then it is treated with carbon (to remove chemical impurities). 

Methanolysis

PET is treated (under pressure and at 200°C) with methanol. This results in de-polymerisation of the molecule. The resulting products are dimethyl terephthalate (DMT) and ethylene glycol (EG). DMT is purified through distillation and crystallisation to give a high quality intermediate that can be used to make new PET. Once refined, EG can be used for a variety of applications including antifreeze and for the PET production.
 

Hydrolysis

PET is hydrolysed through a water treatment and an acid or caustic soda r-treatment to produce terephthalic acid (TA) and ethylene glycol. These require purification before their re-use. Commercial hydrolysis is less established than glycolysis and methanolysis. 

Saponification

PET is hydrolysed by alkali treatment. Two processes have been developed for commercialisation so far: Recopet (France) and Unpet (USA). Recopet is a multistage process in which PET flakes are saponified and filtered. The dyes are extracted before the extraction of PTA precipitates, sodium sulphate and EG. The Unpet process produces EG and disodium terephthalate. These are then heated in order for EG to evaporate and reduce organic impurities to carbon dioxide and water. Disodium terephthalate is obtained by filtration from aqueous solution.
 

Pyrolysis

Mixed-stream thermoset polymers are broken down (in the absence of oxygen and at high temperatures) to yield a mixture of hydrocarbons similar to naphtha. This "chemical soup" is used as fuel or as feedstock for the petrochemical industry.

PETCORE EUROPE is the association representing the complete PET value chain in Europe

Petcore Europe / Members Map

PETCORE EUROPE - PET value chain. You can find more about our members on the map below.

UPCOMING MEETINGS & EVENTS

FUNCIONAL BARRIER MONITORING INTERIM REPORT APRIL 2024.pdf

Make sure you enter the (*) required information where indicated.

For the PET resin producers association:

• Antonello Ciotti (Dow ) representing PET Europe – President
• Colm Jordan (Indorama) representing PET Europe
• Jorge Villanueva (Alpek) representing PET Europe

Ambassador:

• Christian Crepet (Petcore Europe) 

For the PET converter associations:

• Marc de Voogd (Alpla) representing Forum PET

For the PET recyclers associations:

• Casper van den Dungen (Poly Recycling) representing PRE – Vice President
• Herbert Snell (MultiPet) representing PRE

For the member companies:

• Christoph Wöss – Erema (Machinery)
• Ana Fernandez – Klöckner Pentaplast (Sheets)
• John McClelland – Avient – Treasurer (Masterbatch)
• Gian de Belder – P&G (Brand Owner)
• Sabine Zariatti- Suez (Waste management)
• Antoon Spiessens – Coca-Cola (Brand Owner)
• Bernhard Heisel - Schwarz Gruppe (Retailers)

For the PET resin producers association:

• Paola Arlotti (Equipolymers) representing CPME – President
• Santiago Rotstein (Plastiverd) representing CPME
• Stephen Short (Indorama) representing CPME

For the PET converter associations:

• Raphael Jaumotte (Plastipak) representing EuPC – Treasurer
• Marc De Voogd (Alpla) representing Forum PET Europe
• Joachim Eckstein representing EuPET

For the PET recyclers association:

• Casper van den Dungen (Poly Recycling) representing PRE – Vice President
• Herbert Snell (MultiPet) representing PRE

For the member companies:

• Francoise Poulat – Danone
• Christoph Wöss – Erema
• Carsten Heldmann – Klöckner Pentaplast
• Zach Crawford – PolyOne / ColorMatrix
• Gian de Belder – P&G
• Christine Leveque – Suez

Honorary / founding member:

• Marcel de Botton – Logoplaste

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