PEFTEC - Abstract

Abstract Title: Screening of pyrolysis oils from plastic by GCGC-PI-TOFMS and GC-VUV
Abstract Type: Seminar
Session Choice: Renewables Recyclates Characterizations
Presenter Name: Dr Eliane Lazzari
Co-authors:Prof Giorgia Purcaro
Prof Jean-Franois Focant
Dr Pierre Giusti
Dr Marco Piparo
Company/Organisation: TotalEnergies
Country: France

Abstract Information :

rnPyrolysis of plastics is a hot topic to process and converting the large amount of waste in the same time reaching the needs for circularity economic. Even though the output from pyrolysis plastic waste is similar to the composition of tradition fossil-based hydrocarbons streams, still based on PIONA related compounds, the compounds proportion are different, for instance, pyrolysis plastic oil includes a large amount of olefins linear, branched and di-olefinic which can make not obvious the detailed group-type analysis. rnIn order to avoid problems in the unit during the plastic oil upgrading as well as choice the best feedstock, the composition of pyrolysis oils from plastics must be evaluated in detail. In this way, an analytical method by two-dimensional gas chromatography GCGC, specially coupled with a photoionization PI time of flight mass spectrometry TOFMS was used to reveal the plastic pyrolysis oil composition. A reverse phase column combination mid-polar in the 1st dimension and non-polar in the 2nd dimension together a well optimized analytical conditions allowed to obtain a good bi-dimensional resolution and the detection by FID and TOFMS the quali-quantitative samples screening. Compounds PIONA grouping were achieve thanks to detection of molecular ion by PI-TOFMS, moreover, olefins were successful distinguished from naphthene by the soft ionization spectra even though such compounds elute together in the 2D separation and showing similar spectra by hard ionization techniques. Certain olefins identification achieved by PI was further confirmed by chromatography coupled to vacuum ultraviolet detection GC-VUV under the assumption of olefins VUV spectra absorption differs from other PIONA compounds. All information altogether were fundamental to explain the pyrolysis plastic pyrolysis composition as well as checking the efficiency of upgrading process which have been applied to improve the properties of liquid product obtained by pyrolysis of recycled plastics. rn