Study on pyrolytic kinetics and behavior: The co-pyrolysis of microalgae and polypropylene

Wu, Xiuyun; Wu, Youqing; Wu, Kejing; Chen, Yu; Hu, Husheng; Yang, Mei

doi:10.1016/j.biortech.2015.06.029

Cited by 114 publications

(26 citation statements)

References 31 publications

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“…Based on the position of these peaks on the DTG curves (410–435 °C), these weak peaks corresponded to the degeneration of Low-density Polyethylene (LDPE), High-density Polyethylene (HDPE) and Polypropylene (PP) [ 25 ]. Additionally, the activation energies of these films were located in the range from 142 kJ mol −1 to 164 kJ mol −1 [ 50 , 51 ]. Meanwhile, the activation energies of the strong peaks (440–470 °C) were located in the range from 241 to 294 kJ mol −1 .…”

Section: Resultsmentioning

confidence: 99%

Modeling of Metalized Food Packaging Plastics Pyrolysis Kinetics Using an Independent Parallel Reactions Kinetic Model

2020

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Recently, a pyrolysis process has been adapted as an emerging technology to convert metalized food packaging plastics waste (MFPWs) into energy products with a high economic benefit. In order to upscale this technology, the knowledge of the pyrolysis kinetic of MFPWs is needed and studying these parameters using free methods is not sufficient to describe the last stages of pyrolysis. For a better understanding of MFPWs pyrolysis kinetics, independent parallel reactions (IPR) kinetic model and its modification model (MIPR) were used in the present research to describe the kinetic parameters of MFPWs pyrolysis at different heating rates (5–30 °C min−1). The IPR and MIPR models were built according to thermogravimetric (TG)-Fourier-transform infrared spectroscopy (FTIR)-gas chromatography−mass spectrometry (GC-MS) results of three different types of MFPWs (coffee, chips, and chocolate) and their mixture. The accuracy of the developed kinetic models was evaluated by comparing the conformity of the DTG experimental results to the data calculated using IPR and MIPR models. The results showed that the dependence of the pre-exponential factor on the heating rate (as in the case of MIPR model) led to better conformity results with high predictability of kinetic parameters with an average deviation of 2.35% (with an improvement of 73%, when compared to the IPR model). Additionally, the values of activation energy and pre-exponential factor were calculated using the MIPR model and estimated at 294 kJ mol−1 and 5.77 × 1017 kJ mol−1 (for the mixed MFPW sample), respectively. Finally, GC-MS results illustrated that pentane (13.8%) and 2,4-dimethyl-1-heptene isopropylcyclobutane (44.31%) represent the main compounds in the released volatile products at the maximum decomposition temperature.

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Section: Resultsmentioning

confidence: 99%

Modeling of Metalized Food Packaging Plastics Pyrolysis Kinetics Using an Independent Parallel Reactions Kinetic Model

2020

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“…In the range of 2000-750 cm −1 , there are several minor peaks at 1508 cm −1 , 1458 cm −1 , 1362 cm −1 , 1268 cm −1 , 1183 cm −1 , 1091 cm −1 , 1024 cm −1 , and 895 cm −1 including a major peak at 1760 cm −1 which can be attributed to the C=O stretching functional group with a strong appearance [39]. Other weak absorbance peaks in the range 2000-750 cm −1 can be assigned to the C=C stretching functional group in alkene, amine, and ketone [43] and C-H bending vibrations in the methylene group along the symmetry axis of carbon [42,[44][45][46][47].…”

Section: Ftir Of the Released Gas By Thermal Degradation Of Plapmentioning

confidence: 98%

“…No trace of C-H stretching groups can be seen after the heating of 30 min (the temperature more than 500 °C). In the frequency range of 2600-2000 cm −1 , a significant peak can be observed at 2357 cm −1 which might be ascribed to the asymmetric O=C=O functional groups of carbon dioxide (CO 2 ) [42]. In the range of 2000-750 cm −1 , there are several minor peaks at 1508 cm −1 , 1458 cm −1 , 1362 cm −1 , 1268 cm −1 , 1183 cm −1 , 1091 cm −1 , 1024 cm −1 , and 895 cm −1 including a major peak at 1760 cm −1 which can be attributed to the C=O stretching functional group with a strong appearance [39].…”

Section: Ftir Of the Released Gas By Thermal Degradation Of Plapmentioning

confidence: 99%

Microrecycling of the metal–polymer-laminated packaging materials via thermal disengagement technology

2019

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Polymer-laminated metals are widely used in the packaging industries due to their flexibility of applications, superior properties, and relatively lower cost. Despite the advantages accomplished by the polymer-metal multilayer packaging materials, the recycling is a very difficult task due to the complexities of multimaterial intrinsic behaviors during the processing of cast-off materials. This study represents an innovative and sustainable way of recycling polymerlaminated aluminum packaging (PLAP) materials (postconsumer food packaging) into high-quality aluminum and a potential source of high-energy hydrocarbon gases and particulate carbon coproducts. Both sides of the aluminum foil of the packaging were laminated by two different polymers (polyethylene terephthalate, and polypropylene). Volatiles from the PLAP materials were eliminated by the thermal disengagement technology at 400-650 °C (5-30 min) with and without an inert gas supply. The volatiles evaporated from the PLAP materials were about 32%, and the rest 68% were aluminum (~ 65%) and carbon (~ 3%) from the decomposition of the polymers. The oxidation behavior of the surface of the recycled aluminum was studied by XRD, XPS, and elementary mapping, and a nanoscale oxidized surface was found in both inert and air atmospheric TD. The purity of the aluminum was measured above 98% by two different methods (LIBS and ICP-MS). The gaseous products released in TD were detected as high energy-carrying hydrocarbon, CO 2 , CO, H 2 , H 2 O, and few other gases observed by real-time monitoring. The clean gases released in TD might be utilized upon reforming into CH 4 or H 2 by further processing or as it turns out might be utilized as a source of heat energy for other applications. Carbon found from the decomposition of the hydrocarbons can be another useful element of this study. This recycling process offers an economically and environmentally feasible recycling strategy for a complex multilayer polymer-metal packaging waste.

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“…In addition, lower energy consumption has been reported in comparison with the other thermal treatments such as torrefaction, due to its lower temperature, resulting in reduced ash content and biochar yield (Kambo and Dutta, 2015; Alvarez-Chavez et al, 2019b). After applying a hydrothermal pretreatment to the biomass, some of the changes in its physicochemical composition that have been reported are an improvement in the grindability and hydrophobicity (Le Roux et al, 2015; Dai et al, 2017), a decrease in the proportion of alkalis contained in the biomass (Zheng et al, 2015;Yao and Ma, 2018), and an increase in the fixed carbon and calorific value with no effect on the volatile content (Wu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Optimization of microwave-assisted hydrothermal pretreatment and its effect on pyrolytic oil quality obtained by an auger reactor

2021

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Microwave-assisted hydrothermal (MHT) treatment of biomass has received significant attention owing to energy efficiency during internal energy transfer and the additional benefits to the hydrochar produced in terms of physicochemical composition. Therefore, this study proposes the combination of MHT pretreatment with the fast pyrolysis process, to evaluate and optimize the effect of this treatment on the quality of the hydrochar and, consequently, on the quality of the bio-oil. The optimization of MHT treatment using black spruce was carried out, followed by fast pyrolysis of the hydrochar produced under optimal conditions in an auger reactor at 550 °C to obtain a high-quality bio-oil. As a result, the pretreated biomass showed on the one hand a significant decrease in the ash content by 58% and 43% in the content of the extractives. While on the other hand, the obtained hydrochar showed an increase in the availability of cellulose by 18.5% as a consequence of the reduction in the content of hemicellulose. Accordingly, hydrochar showed an increase in thermal stability during pyrolysis and it produced a higher total bio-oil yield, increasing by 24%. Most importantly, the oil obtained showed a 35% reduction in moisture content. Chemical composition of the oil was qualitatively examined through GC-MS analysis. It was observed that the bio-oil showed a dramatic increase in the relative content of levoglucosan, by 127%. A bio-oil with the characteristics obtained would be a suitable candidate for use in boilers for heating purposes or chemical extraction.

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Study on pyrolytic kinetics and behavior: The co-pyrolysis of microalgae and polypropylene

Cited by 114 publications

References 31 publications

Modeling of Metalized Food Packaging Plastics Pyrolysis Kinetics Using an Independent Parallel Reactions Kinetic Model

Modeling of Metalized Food Packaging Plastics Pyrolysis Kinetics Using an Independent Parallel Reactions Kinetic Model

Microrecycling of the metal–polymer-laminated packaging materials via thermal disengagement technology

Optimization of microwave-assisted hydrothermal pretreatment and its effect on pyrolytic oil quality obtained by an auger reactor

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