Scrap tyre pyrolysis: Are the effluents valuable products?

Abstract

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Pyrolysis of waste tyres in an atmospheric static-bed batch reactor: Analysis of the gases obtained

“…The authors suggest that the increase with temperature is due to the decomposition of the inorganic compounds in the tyre such as CaSiO 4 , CaCO 3 , ZnO, etc., which decompose at higher temperatures than the organic compounds and contribute to the formation of CO and CO 2 . Napoli et al [8] only found CO 2 in the temperature interval between 380 and 450 8C and similar amounts of CO and CO 2 at 550 8C. González et al [25] obtained increasing yields of CO X as the temperature increased from 400 up to 700 8C, with CO increasing and CO 2 remaining almost constant.…”

“…Tyre pyrolysis is currently receiving renewed attention and leads to the production of a solid carbon residue, a condensable fraction and gases. The solid residue contains the mineral matter initially present in the tyre, and this solid char may be used either as smokeless fuel, carbon black or activated carbon [7,8]. The liquid by-products of tyre pyrolysis consist of a very complex mixture of organic compounds of 5-20 carbons with a very high proportion of aromatics [9].…”

Characterization of the liquid products obtained in tyre pyrolysis

“…Very different experimental procedures have been used including thermogravimetric analysers [6,7], fixed bed reactors [4,5,[8][9][10], fluidised bed pyrolysis units [11][12][13], vacuum pyrolysis units [14][15][16][17][18][19][20][21][22][23], spouted bed reactors [24], etc., and ranging from laboratory to commercial scale plants. Such studies have been focused on different items of the pyrolysis process, such as kinetics, reactor design, products characterization, economics, etc.…”

Pyrolysis of waste tyres: The influence of USY catalyst/tyre ratio on products

“…It was concluded that the naphtha had a higher octane number than petroleum naphtha but must be hydrofined and reformed. There are many other reports about the pyrolysis of tyres [16,17].…”