Evaluation of the properties of tyre pyrolysis oils obtained in a conical spouted bed reactor

Tires, conveyor belts, floor mats, and shoe soles form a main-stream of rubber waste. The amount of these used materials continuously increases due to development of the rubber market. Therefore, pro-ecological utilization (i.e., energy recycling instead of burning) and recovering valuable and recyclable materials becomes an urgent necessity. In this regard, this work was devoted to the chemical recycling of selected used rubber products, and it especially explores the possibility of limonene production. Different types of waste rubber were characterized and pyrolyzed at microgram and laboratory scales, and the results were compared. Additionally, the pyrolysis of tires, the most significant stream of rubber waste, was also conducted in a semi-technical scale reactor. The effectiveness of limonene formation in the liquid fractions obtained from different types of waste rubber was compared.

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“… Scheme of two mechanisms for the pyrolytic decomposition of natural rubber to limonene based on [ 23 , 24 , 25 ]. …”

Section: Figurementioning

confidence: 99%

Waste Rubber Pyrolysis: Product Yields and Limonene Concentration

et al. 2020

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“…The lower heating value of sewage sludge pyrolysis oil was higher than that of biomass pyrolysis oil. Alvarez et al [23] studied the influence of temperature on the properties of the tire pyrolysis oils obtained by fast pyrolysis of waste truck tires in a conical spouted-bed reactor. The aromatics production of waste tire was promoted at high temperatures due to secondary recombination reactions, whereas limonene was the major compound in the range of 425-475°C.…”

Section: Introductionmentioning

confidence: 99%

Influence of Operating Conditions for Fast Pyrolysis and Pyrolysis Oil Production in a Conical Spouted‐Bed Reactor

et al. 2019

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Fast pyrolysis experiments of larch sawdust were conducted in a conical spouted‐bed reactor to study the influences of reaction temperature, inlet gas velocity, feeding rate, and particle size on the product yield and pyrolysis oil quality. For the first time, the optimal conditions were determined for various pyrolysis operations of such reactor to increase the yield and quality of pyrolysis oil. The results demonstrate that the biomass particle size, reaction temperature, biomass feeding rate, and inlet gas velocity all affected the quality and yield of the pyrolysis oil, in this order.

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“…There is limited information on the chemical structure of element-organic compounds formed in the process of pyrolysis and passing into the synthetic fuel. Analysis revealed [27] the presence of some undesired compounds with sulfur, nitrogen, or oxygen functionalities, such as benzotiatholes, nitriles, and carboxylic acids, amongst others.…”

Section: Discussionmentioning

confidence: 99%

End of Life Tires as a Possible Source of Toxic Substances Emission in the Process of Combustion

et al. 2019

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Several million tons of end of life tires (ELTs) are piled annually as a result of human activities. Various methods have been proposed for the extraction and recycling of the resource potential of ELTs. The chemical composition of ELTs seems to enable their usage as a fuel after mechanical separation of a steel cord. Indeed, in the rubber of ELTs, up to 90 mass% accounts for carbon and hydrogen. Currently, it is by incineration that a significant proportion of ELTs is utilized. However, ELTs contain not only sulfur, which is used for vulcanization, but also nitrogen-containing additives. The behavior of these heteroatoms during oxidation is poorly investigated. It has been shown that the pyrolysis liquid fuel obtained from ELTs contains such sulfur compounds as mercaptans and nitrogen in the form of hydrocyanic acid and cyanogen. Deep oxidation of ELTs results in the oxidation of sulfur compounds to dioxide, but the oxidation products have been found to contain traces of cyanogen. Taking this into account, one should pay attention to the ways of transforming heteroatoms during the process of ELT oxidation and the products of ELT pyrolysis as potential sources of highly toxic gas emissions.

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Evaluation of the properties of tyre pyrolysis oils obtained in a conical spouted bed reactor

Cited by 100 publications

References 56 publications

Waste Rubber Pyrolysis: Product Yields and Limonene Concentration

Waste Rubber Pyrolysis: Product Yields and Limonene Concentration

Influence of Operating Conditions for Fast Pyrolysis and Pyrolysis Oil Production in a Conical Spouted‐Bed Reactor

End of Life Tires as a Possible Source of Toxic Substances Emission in the Process of Combustion

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