Novel Process for Recycling Waste Plastics To Fuel Gas Using a Moving-Bed Reactor

Kodera, Yōichi; Ishihara, Yumiko; Kuroki, Takeshi

doi:10.1021/ef0502655

Cited by 65 publications

(39 citation statements)

References 14 publications

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“…The thermal decomposition of polymers also involves the formation of volatile species within a highly viscous polymeric matrix. An important factor in the formation of gaseous product is the control of the reaction environment in terms of the components in each phase [4].…”

Section: Methodsmentioning

confidence: 99%

Chromatographic study of the recovered gases from hydropyrolytic de-polymerization of LDPE, MDPE and HDPE mix type of waste polyethylene

2015

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The thirst of energy is one of the biggest challenges the world is facing today. The search for new alternative and renewable source of energy is being studied worldwide. The emission of harmful gases such as NO x , SO x , CO and CO 2 and other greenhouse gases in the environment contributes to the global warming and also causes health related problems. Polyethylenes are substances which take longer time for its decomposition and are one of the biggest threats to the environment. The waste polyethylene was thermally de-polymerized and during such process the gases recovered were studied. The study was carried out on low-medium and high-density polyethylene mix. The study of the waste polyethylene into useful hydrocarbon products provides scope for further investigation on this field for the production of domestic fuel. The comparisons of the recovered gases with the LPG gas components were also studied and there fuel property is discussed. This paper describes the gaseous hydrocarbon components recovered during the process of thermal degradation of polyethylene. The component recovered and their importance as fuel is also studied.

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Section: Methodsmentioning

confidence: 99%

Chromatographic study of the recovered gases from hydropyrolytic de-polymerization of LDPE, MDPE and HDPE mix type of waste polyethylene

2015

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“…The dissolution of PS wastes has been studied but focused on the thermal recycling (pyrolysis) [36]. With this aim, Zhang et al [37] proposed the use of biodiesel as a solvent to obtain a solution with a high specific heat; Kodera et al [38] developed a bench scale process to combine PS and the solvents derived from the pyrolysis of their own wastes; Karaduman et al [39] studied the thermal degradation of PS in aliphatic, cyclic and aromatic solvents. And recently, Kim et al [40] employed automobile lubricating oil wastes as solvent to swell PS wastes observing improved heat transfer.…”

Section: Polystyrene Recyclingmentioning

confidence: 99%

Polystyrene Wastes: Threat or Opportunity?

Gutiérrez

Haro

Garcı́a

et al. 2014

The Handbook of Environmental Chemistry

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The recycling of polystyrene (PS) wastes could be considered even economically feasible if, apart from the intrinsic environmental benefits, the wastes are transformed into high-added value products with enhanced properties. In this work, the development of an integral recycling process for polystyrene wastes by means of a new and cost-effective alternative to traditional plastic recycling techniques has been proposed. The methodology consists of the selective dissolution of the plastic wastes with suitable natural solvents (terpene oils) to get a volume reduction without degradation of the polymer chains. The employment of a natural solvent for the treatment of polystyrene wastes transforms the process in an environmentally friendly technology. High pressure CO 2 is proposed to perform the solvent removal in order to avoid the formation of undesirable by-products and to improve the quality of the recycled plastic, since it acts as a physical foaming agent. The use of CO 2 is very attractive because it makes the polymer-solvent separation easier, improves the mass transfer into the highly swelled polymer bulk and allows the tuning of the final properties of the recovered PS. A controlled foaming of the polystyrene-solvent mixtures can be easily carried out at moderate temperatures and pressures by exploiting the advantages that provide the recycling with a natural solvent, obtaining completely free of solvent PS foams. Adjusting the

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“…Table 10 summarizes the compositions of municipal wastes in Japan and the properties of RDF [36]. A specification guideline of RDF is shown in a technical specification document of the Japanese Industrial Standard as shown in Table 11 [38]. Typical dimension of RDF briquettes is 10 -50 mm diameter and 10 -100 mm length.…”

Section: Refuse-derived Solid Fuelmentioning

confidence: 99%