化工进展2024，Vol.43Issue(6)：3420-3429,10.DOI:10.16085/j.issn.1000-6613.2023-0769
溶剂低压过热蒸汽热裂解塑料制油过程特性
Thermal decomposition of plastics via low pressure and superheated solvent steam and its characteristics
摘要
Abstract
The low-carbon and clean disposal of plastic wastes has great significance to environmental protection and the development of circular economy.A method of thermal decomposition to liquefy plastics in low pressure and superheated solvent steam system was proposed.The solvent thermal decomposition feasibility and characteristics of polypropylene(PP)and high density polyethylene(HDPE)under low pressure(≤5MPa)were studied.Two kinds of degradation mechanisms of plastic thermal decomposition process were proposed.The results showed that the low-pressure organic solvent vapor system could achieve efficient thermal decomposition of plastics under relatively mild temperature and 330℃was the initial temperature for rapid plastic liquefaction.At 330℃,the thermal liquefaction rates of PP in methanol,ethanol and acetone all were 100%,and the ones of HDPE in methanol,ethanol and acetone were 100%,72.9%and 71.03%,respectively.In such conditions,small molecules generated in plastic liquefaction were more likely to occur polycondensation reaction,which released a lot of heat and made the reaction system appear different amplitude rise of temperature,so as to provide energy for further depolymerization of unreacted plastics to smaller molecules and improve the thermal liquefaction rate of plastics.In PP liquefied oil,the content of oxygenates was more than 40%,while the content of oxygenates in HDPE liquefied oil was lower and the content of hydrocarbons was more than 80%,demonstrating that HDPE had great potential to be used as fuel.关键词
塑料/溶剂/低压过热蒸汽/热裂解/液化/回收/碳氢化合物Key words
plastics/solvents/low pressure and superheated solvent steam/thermal decomposition/liquefaction/recovery/hydrocarbons分类
资源环境引用本文复制引用
赵培涛,傅彬彬,赵泉,左武,周海云,韩东太..溶剂低压过热蒸汽热裂解塑料制油过程特性[J].化工进展,2024,43(6):3420-3429,10.基金项目
江苏省研究生科研与实践创新计划(KYCX22_2527) （KYCX22_2527）
江苏省碳达峰碳中和科技创新专项资金(BE2022604). （BE2022604）
