Research on Thermal Decomposition of Waste PE/PP

Abstract

The most important and the most frequently used plastics are polyethylene (PE) and polypropylene (PP). They are characterised with high heating values (approximately 40 MJ/kg). Moreover, their chemical composition, based mainly on carbon and hydrogen, allows to use them in industrial processes. One of the methods of utilisation of plastic waste can be its use in the metallurgical industry. This paper presents results of thermal decomposition of waste PE/PP. Chemical and thermal analysis (TG) of studied wastes was carried out. Evolved gaseous products from the decomposition of wastes were indentified using mass spectrometry (TG-MS). This paper also presents an application of plastic wastes as supplemental fuel in blast furnace processes (as a substitute for coke) and as an addition in processes of coking coal.

Development of an Analytical Reaction Kinetics Mathematical Model Based on Thermogravimetric Data for Reclaimed Plastic Waste From Active Landfills

“…The beginning of the degradation process was around 250°C due to the combustion of the alkane groups; the temperature of spontaneous combustion is lower than 250°C for alkanes such as n-hexane and n-heptane, n-octane, n-nonane, n-decane and n-undecane. The end-set temperature of PE was estimated to be 550°C and approximately 400°C for PP [51]. Tables 5-8 and Fig.…”

Biogas production from agricultural and municipal waste

“…550 °C, except the temperature at the end of decomposition of polypropylene, which is appox. 400 °C [16]. The beginning of the process of decomposition can be caused by the combustion of compounds from an alkanes group, whose temperature of spontaneous combustion is lower than 250 °C (e.g.…”

“…Further stages in the process of decomposition are associated with the process of compound combustion, which includes: nbutane, 1,3-butadiene, ethane and ethylene, and these gases occur at a temperature of approx. 350 °C, 400 °C and 450 °C [16]. There are also present the combustible compounds with higher (than 450 °C) ignition temperature such as: CH4, CO and C6H6 [16].…”

“…350 °C, 400 °C and 450 °C [16]. There are also present the combustible compounds with higher (than 450 °C) ignition temperature such as: CH4, CO and C6H6 [16]. Temperature at which 50% (TG-T50) of weight loss occurred in municipal waste digestate is 552 o C. The amount of mass remained was 46.07%.…”

Simulation of blast furnace operation during the substitution of coke and pulverized coal with granulated waste plastic

“…Za primenu otpadne plastike kao reducenta za proces u visokoj peći, neophodno je istu dobiti u ade-kvatnom obliku. U tu svrhu se koriste operacije mlevenja, kompaktiranja, briketiranja, peletiziranja i ekstruzije [3][4][5]. Nakon dobijanja plastike u adekvatnom obliku i injektiranja u visoku peć kroz duvnice, ista se gasifikuje do CO i H2 koji služe kao reducenti oksida železa iz rude.…”