Conversion Kinetics of the Gaseous Products of Pyrolysis of Polypropylene and Waste Tires
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USTION, EXPLOSION, AND SHOCK WAVES
Conversion Kinetics of the Gaseous Products of Pyrolysis of Polypropylene and Waste Tires A. M. Terezaa, *, G. L. Agafonova, E. K. Anderzhanova, S. P. Medvedeva, S. V. Khomika, S. K. Petrovb, and M. V. Chernyshovb aSemenov
Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991 Russia b Baltic State Technical University VOENMEH, St. Petersburg, 190005 Russia *e-mail: [email protected] Received January 15, 2020; revised February 10, 2020; accepted February 20, 2020
Abstract—Numerical simulations are performed of reaction kinetics in the gaseous products of pyrolysis of polypropylene and waste tires at atmospheric pressure in the temperature range of 800 to 1300 K. The initial conditions are set by using the experimental data available in the literature. The reactions between gaseous pyrolysis products are found to result in a decrease in the mixture’s temperature of polypropylene and a temperature increase for waste tires. The increase in the initial temperature reduces the gaseous product’s conversion for both polypropylene and the waste tires. It is established that the conversion pathways for the C1–C4 alkenes and alkanes strongly depend on the initial temperature and their initial composition. Keywords: pyrolysis, recycling, polypropylene- and rubber-containing waste, gasification products, numerical simulation, chemical kinetics DOI: 10.1134/S1990793120040247
INTRODUCTION Pyrolysis of household rubbish usually refers to the thermochemical decomposition of organic substances and materials at a high temperature in the absence of oxygen or in the presence of a small amount of air directly in the initial material [1]. This process always leads to partial gasification. Depending on the geographical and economic characteristics of the area, various methods of recycling technological and human waste are prevalent in various countries. In countries with advanced technologies, pyrolysis of petrochemicals mainly prevails, while in others, it is the disposal of phytogenic waste. At the same time, the development of technology and economic geography are also determined by the economies of countries and their need for raw materials, which can include pyrolysis products. The studies [1, 2] analyze the influence of economic geography and technological development of the world’s major economies on methods of pyrolytic decomposition of wastes in order to obtain the most useful products for these countries. For countries with a developed petrochemical industry, pyrolysis of polymer products and rubber-containing materials, in particular worn-out automobile tires, is the most relevant method. Pyrolysis of wastes from polyethylene, polypropylene, rubber, and plastic, as well as household rubbish containing these ingredients, has been actively studied for the past few decades [1–5]. However, due to the
different design features of pyrolytic plants and the variety of household rubbish of petrochemical synthesis products, it is difficult to form a single recycli
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