Looking for a reliable approach to screen recycled pet

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Information about Looking for a reliable approach to screen recycled pet
Technology

Published on March 12, 2014

Author: ISXperts

Source: slideshare.net

Description

Polyethylene terephthalate (PET) is a thermoplastic polymer resin of the polyester family and is used in synthetic fibers, beverage, food and other liquid containers, thermoforming applications and engineering resins. Depending on its processing and thermal history, PET may exist both as an amorphous and as a semi-crystalline polymer. Polymerization is through a polycondensation reaction of the monomer ethylene terephthalate with water as the byproduct.The majority of the world's PET production is for synthetic fibers with bottle production accounting for around 30% of global demand. The polyester industry makes up about 18% of world polymer production and is third after polyethylene (PE) and polypropylene (PP). Mechanical recycling of PET becomes more and more economically valuable due to the growing environmental awareness of the (Western) customer. The possibility of using recycled PET which will come into contact with food creates the need to develop efficient and sensitive analytical methods applicable to the identification and quantification of contaminants from recycled PET, which would also evidence that this recycled material complies with the terms of legislation. The recycling processes of PET for direct food contact have to evidence efficiency of contaminant removal and ensure consumer protection.

Looking for a reliable approach to screen recycled PET pellets Dr. Joeri Vercammen Managing Expert IS-X www.is-x.com

2007: 11.400.000 tonnes Source: www.foodproductiondaily.com

2012: 14.800.000 tonnes Source: www.foodproductiondaily.com

2017: 19.100.000 tonnes Source: www.foodproductiondaily.com

Source: www.petcore-europe.org 120.000.000.000 bottles in 2012.

Source: www.petcore-europe.org 52% recycled.

Polyester fibers. In 2011, 39% of all recovered European PET was used to produce polyester fibers.

Packaging. In 2011, 25% of the European RPET was used to make containers (food & non-food).

Eco pallets. The PET industry continuously looks for new applications for reclaimed material.

Develop a method that is capable of assuring the quality of recycled PET for applications in the food industry.

Most interferences coming from other plastics, flavour compounds, inks, etc.

Current state-of-the-art

About 3,720,000 results (0.39 seconds)

SFE GC/MS Pyrolysis GC/MS Liquid GC/MS Headspace GC/MS

SFE GC/MS Pyrolysis GC/MS Liquid GC/MS Headspace GC/MS

SFE GC/MS Pyrolysis GC/MS Liquid GC/MS Headspace GC/MS

SFE GC/MS Pyrolysis GC/MS Liquid GC/MS Headspace GC/MS

SFE GC/MS Pyrolysis GC/MS Liquid GC/MS Headspace GC/MS

Headspace techniques

Static Headspace Injection □ Classic hardware □ GC/MS friendly □ Robust □ Limited sensitivity

Solid Phase Microextraction □ “Classic” hardware □ On-line and off-line □ Enrichment technique □ Not quantitative

Direct Thermal Extraction □ Dedicated hardware (TD unit) □ Fast □ Automated □ Risk of contamination

Microchamber/Thermal Extraction □ Dedicated hardware (TD unit + µ-CTE) □ Off-line procedure □ Quantitative □ Reference method

Results and discussion

Standards & samples □ Megamix (Restek, # 30601) □ Ten PET samples □ Virgin □ Recycled OK □ Recycled NOK □ Blend virgin/recycled

Hardware □ Thermo Trace 1300 GC □ Thermo ISQ single quadrupole MS □ Thermo Triplus RSH □ Markes TD-100 thermal desorption system □ Markes µ-CTE 250 □ SPME fibers (30 µm PDMS, Supelco)

Software □ Thermo Trace Finder □ AMDIS deconvolution sw

Static headspace □ Sample weight : 5 g □ Equilibration : 30 min @ 150 °C □ Volume : 1 mL □ Split ratio : 30:1 Insufficiently sensitive to discriminate between the various PET samples.

Solid phase microextraction □ Sample weight : 1 g □ Sampling : 30 min @ 150 °C □ Injection : splitless Insufficiently sensitive to discriminate between the various PET samples.

Direct thermal extraction □ Sample weight : 0.1 g (PTFE sleeve) □ Tube desorption : 20 min @ 220 °C □ Trap : general purpose □ Split ratio : 250:1 Fast system contamination. Limited reproducibility.

Microchamber/thermal extraction □ Sample weight : 5 g □ Extraction temp : 200 °C □ Sampling : 40 min @ 50 mL/min □ Sampling tube : 100% Tenax

Microchamber/thermal extraction □ Sample weight : 5 g □ Extraction temp : 200 °C □ Sampling : 40 min @ 50 mL/min □ Sampling tube : 100% Tenax □ Tube desorption : 20 min @ 220 °C □ Trap : general purpose □ Split ratio : 500:1

Virgin PET RT: 0.00 - 19.03 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (min) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 RelativeAbundance 12.71 14.03 14.63 14.89 18.3815.28 15.93 16.20 17.26 12.37 13.89 13.29 4.58 11.45 12.16 10.81 9.64 8.243.28 9.60 2.94 10.33 9.14 7.69 8.615.70 4.83 7.547.12 3.42 5.13 6.042.04 3.96 6.24 NL: 3.58E7 TIC MS 02082011_ sk52 1,2-Ethanediol phthalate

RT: 0.00 - 19.03 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (min) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 RelativeAbundance 13.89 15.7415.08 15.93 16.68 18.18 4.59 13.83 3.28 13.52 13.31 9.16 12.8612.242.97 10.405.71 6.06 8.26 10.877.714.853.44 8.52 9.677.012.83 NL: 2.21E7 TIC MS 02082011_ sk55 Recycled OK 1,2-Ethanediol 4(1H)-Quinazolinone

Recycled NOK RT: 0.00 - 19.03 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (min) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 RelativeAbundance 12.60 7.35 13.86 10.39 3.31 17.2413.05 15.894.63 14.8412.427.60 17.8911.767.896.06 9.856.865.15 9.892.95 3.44 NL: 9.06E8 TIC MS 02082011_ sk70 Limonene Benzofuran Benzoic acid, 3-methyl-

RT: 0.00 - 19.01 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (min) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 RelativeAbundance 18.7810.32 15.13 18.42 15.34 14.52 11.77 16.43 14.23 13.84 15.894.60 17.23 17.53 8.71 13.3611.07 13.06 3.30 12.769.53 8.26 9.38 7.817.42 2.11 2.95 6.85 4.98 5.71 4.49 5.82 NL: 1.91E7 TIC MS 02082011_ sk78 Blend Limonene

Conclusions

Looking for a solution to screen PET pellets?

Looking for a solution to screen PET pellets?

Looking for a solution to screen PET pellets? Microchamber/thermal extraction GC/MS in full scan/SIM mode AMDIS deconvolution

Need assistance or advice? Just give me a call or sent me an email. j.vercammen@is-x.com 010/45.00.25

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