Impact of fast and slow pyrolysis on the degradation of mixed plastic waste: Product yield analysis and their characterization

Singh, Rohit Kumar; Ruj, Biswajit; Sadhukhan, Anup Kumar; Gupta, Parthapratim

doi:10.1016/j.joei.2019.01.009

Cited by 140 publications

(44 citation statements)

References 36 publications

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“…It also contains a relatively low abundance of heteroatom compounds such as oxygen-, nitrogen-, and sulfur-containing compounds, as well as halogens and metals [14][15][16][17][18]. However, the compositions thereof vary widely depending on the plastic source used and the operating conditions applied (e.g., temperature, pressure, and residence time) [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Detailed Group-Type Characterization of Plastic-Waste Pyrolysis Oils: By Comprehensive Two-Dimensional Gas Chromatography Including Linear, Branched, and Di-Olefins

2021

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Plastic-waste pyrolysis oils contain large amounts of linear, branched, and di-olefinic compounds. This makes it not obvious to determine the detailed group-type composition in particular to the presence of substantial amounts of N-, S-, and O-containing heteroatomic compounds. The thorough evaluation of different column combinations for two-dimensional gas chromatography (GC × GC), i.e., non-polar × polar and polar × non-polar, revealed that the second combination had the best performance, as indicated by the bi-dimensional resolution of the selected key compounds. By coupling the GC × GC to multiple detectors, such as the flame ionization detector (FID), a sulfur chemiluminescence detector (SCD), a nitrogen chemiluminescence detector (NCD), and a mass spectrometer (MS), the identification and quantification were possible of hydrocarbon, oxygen-, sulfur-, and nitrogen-containing compounds in both naphtha (C5–C11) and diesel fractions (C7–C23) originating from plastic-waste pyrolysis oils. Group-type quantification showed that large amounts of α-olefins (36.39 wt%, 35.08 wt%), iso-olefins (8.77 wt%, 9.06 wt%), and diolefins (4.21 wt%, 4.20 wt%) were present. Furthermore, oxygen-containing compounds (alcohols, ketones, and ethers) could be distinguished from abundant hydrocarbon matrix, by employing Stabilwax as the first column and Rxi-5ms as the second column. Ppm levels of sulfides, thiophenes, and pyridines could also be quantified by the use of selective SCD and NCD detectors.

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Section: Introductionmentioning

confidence: 99%

Detailed Group-Type Characterization of Plastic-Waste Pyrolysis Oils: By Comprehensive Two-Dimensional Gas Chromatography Including Linear, Branched, and Di-Olefins

2021

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“…Moreover, thermoplastics are easily recycled, and they include polyethylene, polypropylene, polystyrene, etc. Moreover, the plastic wastes contain an abundance of hydrocarbons and possess a high calori c value and hence are considered as a crucial source of alternate fuels (Phanisankar et al, 2020) (Singh et al, 2019). The thermal pyrolysis and co-pyrolysis can be studied mathematically and validated by the use of kinetic models.…”

Section: Introductionmentioning

confidence: 99%

Study on kinetics, thermodynamics and co-pyrolysis studies of sugarcane bagasse and expanded polystyrene

Mohapatra

Gouda

Mohapatra

et al. 2022

Preprint

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The kinetic studies on co-pyrolysis of sugarcane bagasse, and expanded polystyrene (waste thermocol) was performed using a thermogravimetric analyzer to decipher the mechanism of co-pyrolysis at 5, 10, 15, and 20°C min−1 and to estimate the kinetic triplet and thermodynamics of the co-pyrolysis process. The kinetic parameter values were estimated using Maples first order fitting process.. The co-pyrolysis experiments was performed in a semi-batch reactor at 10°C min−1 in an inert nitrogen atmosphere, from ambient temperatures upto 700°C. The outcome revealed that the optimum temperature and blending ratio was 550°C and 1:3 blending ratio of (sugarcane bagasse:thermocol waste) for the optimum bio-oil yield of 66.75 wt. %. The characterization of the co-pyrolysis bio-oil using FT-IR revealed the presence of more amount of aromatic compounds and hydrocarbons. The increase in aromatic compounds was mostly due to the addition of thermocol waste, which is an aromatic polymer.

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“…Literature reviews on the application of slow pyrolysis in PP plastic conversion are few to the best of our knowledge [23,24,[31][32][33][34][35]. Demirbas et al [36] investigated the relationship between the yield distributions of the pyrolytic products collected from PP with the different pyrolysis temperatures.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Thermal Degradation of Disinfected COVID-19 Non-Woven Polypropylene—Based Isolation Gown Wastes into Carbonaceous Char

et al. 2021

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Yields of carbonaceous char with a high surface area were enhanced by decreasing the temperature to improve the conversion of hazardous plastic polypropylene (PP), the major component in abundantly used isolation gowns. This study applied pyrolysis with different low pyrolytic temperatures to convert disinfected PP-based isolation gown waste (PP-IG) into an optimised amount of char yields. A batch reactor with a horizontal furnace was used to mediate the thermal decomposition of PP-IG. Enhanced surface area and porosity value of PP-IG derived char were obtained via an optimised slow pyrolysis approach. The results showed that the amount of yielded char was inversely proportional to the temperature. This process relied heavily on the process parameters, especially pyrolytic temperature. Additionally, as the heating rate decreased, as well as longer isothermal residence time, the char yields were increased. Optimised temperature for maximum char yields was recorded. The enhanced SBET values for the char and its pore volume were collected, ~24 m2 g−1 and ~0.08 cm3 g−1, respectively. The char obtained at higher temperatures display higher volatilisation and carbonisation. These findings are beneficial for the utilisation of this pyrolysis model in plastic waste management and conversion of PP-IG waste into char for further activated carbon and fuel briquettes applications, with the enhanced char yields, amidst the COVID-19 pandemic.

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Impact of fast and slow pyrolysis on the degradation of mixed plastic waste: Product yield analysis and their characterization

Cited by 140 publications

References 36 publications

Detailed Group-Type Characterization of Plastic-Waste Pyrolysis Oils: By Comprehensive Two-Dimensional Gas Chromatography Including Linear, Branched, and Di-Olefins

Detailed Group-Type Characterization of Plastic-Waste Pyrolysis Oils: By Comprehensive Two-Dimensional Gas Chromatography Including Linear, Branched, and Di-Olefins

Study on kinetics, thermodynamics and co-pyrolysis studies of sugarcane bagasse and expanded polystyrene

Low-Temperature Thermal Degradation of Disinfected COVID-19 Non-Woven Polypropylene—Based Isolation Gown Wastes into Carbonaceous Char

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