Pyrolysis of Polyethylene in a Fluidized Bed Reactor

Conesa, Juan A.; Font, R.; Marcilla, A.; García, A N Jesús

doi:10.1021/ef00048a012

Cited by 174 publications

(158 citation statements)

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“…The peak at 3050 cm indicate C-H cyclic deformations which suggest either aromatic or more likely -CH 2 which has split due to interaction in long molecular chains representing the presence of long oligomer chains. The overall spectra of the polyalkene pyrolysis oil/wax is therefore dominated by the presence of alkane and alkene compounds as has been found by other workers [37,38]. Figure 11.5 shows that the functional group compositional analysis of the pyrolysis oil/waxes derived from the fixed-bed pyrolysis of PVC, PS and PET is very different from the polyalkene plastic pyrolysis oil/waxes.…”

Section: Oil/wax Composition From the Feedstock Recycling Of Single Pmentioning

confidence: 56%

Yield and Composition of Gases and Oils/Waxes from the Feedstock Recycling of Waste Plastic

Williams

2006

Feedstock Recycling and Pyrolysis of Waste Plastics

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Section: Oil/wax Composition From the Feedstock Recycling Of Single Pmentioning

confidence: 56%

Yield and Composition of Gases and Oils/Waxes from the Feedstock Recycling of Waste Plastic

Williams

2006

Feedstock Recycling and Pyrolysis of Waste Plastics

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“…The degradation step is initiated by random scission reaction. Upon this reaction the polyethylene backbone may be further depolymerized by two competing reactions, e.g., (1) the propagation (unzipping) to yield monomers, and also (2) free radicals transfer which involves hydrogen transfer yielding the formation of unsaturated end and new free radicals [15]. Temperature and residence time of the volatiles in the hot region of the furnace are the important parameters in determining the end-products of pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

“…Temperature and residence time of the volatiles in the hot region of the furnace are the important parameters in determining the end-products of pyrolysis. This can be explained as the reaction products are produced from raw material decomposition, which is the primary reaction and also these primary volatiles product may be further depolymerized by secondary reactions that result in smaller monomers that mainly are in gases forms [15]. These primary reaction products are highly vulnerable to temperature and time of pyrolysis as they may undergo secondary reaction.…”

Section: Resultsmentioning

confidence: 99%

Interaction between Polyethylene and Petroleum Coke Substrate during Pyrolysis

Shahnaz¹

2017

Pyrolysis

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There has been a constant growth for plastic demand globally in the past decades, and the continuing expanding trend with rapid emerging economies has increased the concerns of many parties. Various approaches of recycling waste plastic including chemical recycling, thermal recycling, and mechanical recycling has been practiced. As chemical recycling is known to be a promising method in recovering hydrocarbon compounds, which can be used in high-end product, new avenues for waste recycling need to be established. Consumable carbon anodes are a major requirement for process used for producing primary aluminum. Since carbon is a main constituent of waste plastics, which have very low impurity levels, these clearly have the potential as a cheap readily available auxiliary source of carbon in carbon anodes. Coal tar pitch, a major by-product produced in petroleum refining, is the binder of choice for carbon anodes. Pitch penetrates the pores of petroleum coke-binding particulates and gets carbonized during the baking process. In-depth wettability and interfacial phenomena investigation was carried out to study interactions between polyethylene (PE) and petroleum coke (PC). The effect pyrolysis parameters on degradation process of PE have been characterized. The wettability study of polyethylene polymer on PC substrates has been carried out.

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“…Due to the widespread presence of polyethylene (and other plastics) in municipal waste and the use of combustion as a waste disposal mechanism, several studies have examined the pyrolysis and combustion products of PE (Conesa et al, 1994;Kolb et al, 1965;Paabo and Levin 1987;Shemwell and Levendis, 2000;Wheatley et al, 1993). Paabo and Levin (1987) concluded in their literature review that "the toxicity of the combustion products from various samples of polyethylenes [is] not highly or unusually toxic."…”

Section: Introductionmentioning

confidence: 99%

Effect of low-density polyethylene on smoke emissions from burning of simulated debris piles

Hosseini

Shrivastava

et al. 2014

Journal of the Air & Waste Management Association

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Low-density polyethylene (LDPE) plastic is used to keep piled debris from silvicultural activities-activities associated with development and care of forests-dry to enable efficient disposal by burning. The effects of inclusion of LDPE in this manner on smoke emissions are not well known. In a combustion laboratory experiment, 2-kg mixtures of LDPE and manzanita (Arctostaphylos sp.) wood containing 0, 0.25, and 2.5% LDPE by mass were burned. Gaseous and particulate emissions were sampled in real time during the entire flaming, mixed combustion phase-when the flaming and smoldering phases are present at the same time-and during a portion of the smoldering phase. Analysis of variance was used to test significance of modified combustion efficiency (MCE)-the ratio of concentrations of fire-integrated excess CO 2 to CO 2 plus CO-and LDPE content on measured individual compounds. MCE ranged between 0.983 and 0.993, indicating that combustion was primarily flaming; MCE was seldom significant as a covariate. Of the 195 compounds identified in the smoke emissions, only the emission factor (EF) of 3M-octane showed an increase with increasing LDPE content. Inclusion of LDPE had an effect on EFs of pyrene and fluoranthene, but no statistical evidence of a linear trend was found. Particulate emission factors showed a marginally significant linear relationship with MCE (0.05 < P-value < 0.10). Based on the results of the current and previous studies and literature reviews, the inclusion of small mass proportions of LDPE in piled silvicultural debris does not appear to change the emissions produced when low-moisture-content wood is burned. In general, combustion of wet piles results in lower MCEs and consequently higher levels of emissions.Implications: Current air quality regulations permit the use of burning to dispose of silvicultural piles; however, inclusion of lowdensity polyethyelene (LDPE) plastic in silvicultural piles can result in a designation of the pile as waste. Waste burning is not permitted in many areas, and there is also concern that inclusion of LDPE leads to toxic air emissions.

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Pyrolysis of Polyethylene in a Fluidized Bed Reactor

Cited by 174 publications

References 0 publications

Yield and Composition of Gases and Oils/Waxes from the Feedstock Recycling of Waste Plastic

Yield and Composition of Gases and Oils/Waxes from the Feedstock Recycling of Waste Plastic

Interaction between Polyethylene and Petroleum Coke Substrate during Pyrolysis

Effect of low-density polyethylene on smoke emissions from burning of simulated debris piles

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