Hydrothermal decomposition of polyethylene waste to hydrocarbons rich oil

被引：48
作者：
Colnik, Maja [1 ]
Kotnik, Petra [1 ,2 ]
Knez, Zeljko [1 ,2 ]
Skerget, Mojca [1 ]
机构：
[1] Univ Maribor, Fac Chem & Chem Engn, Lab Separat Proc & Prod Design, Smetanova 17, SI-2000 Maribor, Slovenia
[2] Univ Maribor, Fac Med, Dept Chem, Taborska 8, SI-2000 Maribor, Slovenia
来源：
JOURNAL OF SUPERCRITICAL FLUIDS | 2021年 / 169卷 / 169期
关键词：
Polyethylene; Supercritical water; Chemical recycling; Plastic waste; SUPERCRITICAL WATER; PYROLYSIS CHARACTERISTICS; PLASTIC WASTES; POLYPROPYLENE; DEGRADATION; GASIFICATION; OPTIMIZATION; LIQUEFACTION; ADDITIVES; OXIDATION;
D O I：
10.1016/j.supflu.2020.105136
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present study the supercritical water (SCW) degradation of polyethylene (PE) plastics (virgin LDPE, PE waste) has been investigated in a batch reactor at 380-450 degrees C and reaction time of 15-240 min. The experiments (virgin LDPE) were also performed with the addition of acetic acid. During the SCW decomposition of PE plastics oil or wax, aqueous, gas and solid (only in PE waste) phases were formed. The obtained oil phase was composed of alkanes, alkenes, cycloalkanes, aromatics, and alcohols, while the gas phase manly contained light hydrocarbons (C-1-C-6). By performing reaction at high temperatures (425-450 degrees C) and reaction times from 30 to 240 min the concentrations of long-chain hydrocarbons (> C-20) and C-9-C-20 (diesel) fraction in oil phase decreased, while concentration of C-6-C-8 hydrocarbons (gasoline fraction) increased. Finally, the influence of acetic acid on the PE degradation has been discussed and the potential degradation mechanism of PE waste in SCW is proposed.
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页数：10
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