Kojić Ivan, Bechtel Achim, Aleksić Nikoleta, Životić Dragana, Trifunović Snežana, Gajica Gordana, Stojanović Ksenija
Innovation Center of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia.
Department of Applied Geosciences and Geophysics, Montanuniversität Leoben, Peter-Tunner-Str. 5, A-8700 Leoben, Austria.
Polymers (Basel). 2021 Feb 28;13(5):759. doi: 10.3390/polym13050759.
The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography-mass spectrometry (GC-MS), specific carbon isotope analysis of individual hydrocarbons (δC), Rock-Eval pyrolysis, and elemental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrolysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lignite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.
研究了劣质褐煤与高密度聚乙烯（HDPE）在开放系统热解过程中的相互影响，旨在提高褐煤利用率并同时处理HDPE废料。在400、450、500、550和600℃的温度下对褐煤、HDPE及其混合物（质量比1:1）进行热解。通过热重分析（TGA）、气相色谱-质谱联用（GC-MS）、单个烃类的特定碳同位素分析（δC）、岩石热解分析和元素分析对初始底物和热解产物进行表征。在≥450℃的温度下观察到褐煤/HDPE混合物共热解过程中的正协同效应，在500℃时协同效应最大。在500℃时还注意到液体共热解产物的产率最高，其组成与原油相似。与单独热解褐煤相比，褐煤/HDPE混合物共热解得到的液体和气态产物产率以及热解产物质量均有显著提高。另一方面，单独热解HDPE获得的数据表明，它不能与成熟的聚合物回收催化热过程同时进行。然而，考虑到大量生产的HDPE，至少部分这种塑料材料可用于褐煤的深度热处理，特别是在这种低阶煤是主要能源的国家。
