Thermochemical interaction of wood and polyethylene during co-oxidation in the conditions of thermogravimetric analysis
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Thermochemical interaction of wood and polyethylene during co‑oxidation in the conditions of thermogravimetric analysis Igor G. Donskoy1 · Aleksandr N. Kozlov1 · Mariya A. Kozlova1 · Maksim V. Penzik1 · Vitaliy A. Shamanskiy1 Received: 19 August 2020 / Accepted: 24 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In this work, using the methods of thermal analysis, we investigated the features of the oxidative decomposition of mixtures of polyethylene and sawdust (in different mass ratios). The results show that during the mixtures decomposition, the effects of interaction between wood and polyethylene are observed, which, apparently, are associated with the chain nature of the oxidation reactions of both components. It was found that the oxidation of mixtures with a polyethylene fraction of 20% or less proceeds without the formation of a significant amount of products of incomplete decomposition of hydrocarbon chains. Thermogravimetric and calorimetric data are compared with data from mass spectrometric analysis of decomposition products. These data indicate competition between the oxidation and thermal cracking of polyethylene. The presence of biomass due to its high reactivity contributes to an increase in the proportion of oxidation in the total decomposition of polyethylene. Keywords Wood · Polyethylene · TGA · Mass spectrometry · Pyrolysis · Combustion Abbreviations PE Polyethylene TG Thermogravimetry DSC Differential scanning calotimetry
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1114 4-020-01880-y) contains supplementary material, which is available to authorized users. * Igor G. Donskoy [email protected] 1
Melentiev Energy Systems Institute of Siberian Branch of Russian Academy of Sciences, 130 Lermontova st., Irkutsk, Russia 664033
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Reaction Kinetics, Mechanisms and Catalysis
Introduction Problems of municipal wastes utilization become more and more urgent. Polymer materials constitute their major share. World plastics production amounts to 300 million t/y, 40% of which are packing materials that mainly turn into waste. Polyethylene accounts for almost 30% of total amount of industrial polymers produced. Specific plastic production in the developed countries during recent years decreases, whereas capacity of waste processing plants increases [1]. It became possible due to appropriate legislation and social policy [2]. There emerge waste importing countries, and an international market of wastes processing is developing. Plastic wastes can be utilized by classification and recycling [3], by complete burning of polymers or by using thermal decomposition for production of valuable raw materials (monomers, combustion gases, and fuels) [4–6]. Selection of technology depends on polymers content in wastes and on their composition. Combustion is the main technology of thermal utilization, but gasification and pyrolysis units also become attractive [7, 8]. Thermo-chemical conversion of polymers faces a
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