纸塑铝包装废弃物水热产油过程组分交互作用

Interactive Effect between the Main Components of Al-PE-Pa Complex Packaging Waste during Hydrothermal Process for Bio-Oil Production

目的研究纸塑铝复合包装袋中主要组分(纸纤维、低密度聚乙烯和铝箔)水热液化产油特性,分析各组分共液化过程的交互影响作用。方法采用微型反应釜在温度为360℃,压力为20 MPa,反应时间为30 min条件下,分别对纸纤维、低密度聚乙烯(LDPE)和铝箔单组分、双组分及三组分样品进行水热液化反应,对油品产率、元素组成、成分以及固体残渣形貌等进行表征。结果单组分纸纤维的生物产油率为13.67%,但其氧含量高达24.19%,单组分低密度聚乙烯(LDPE)在该条件下基本不解聚。双组分纸纤维/LDPE的产油率(14.88%)明显高于单组分的理论产油率(10.75%),且油品中烃类产物显著升高,酮类、酯类和醇类均有所降低。铝箔能显著降低纸纤维液化油品产物的氧含量,提高了油品热值,油品组分中酯类和酚类产物得到明显降低。三组分纸纤维/LPDE/铝箔产油率由理论计算值10.21%提升至19.00%,高热值由28.80 MJ/kg升至30.04 MJ/kg,油品氧含量降低至21.76%,产物组分中酮类组分由28.12%降低至8.96%。结论纸纤维与LDPE共液化具有显著的协同作用,铝箔在水热条件下对油品实现原位加氢。纸塑铝共液化过程会产生纸塑协同及铝水反应原位加氢的叠加效应。

The work aims to study the main components(paper fiber,low-density polyethylene and aluminum foil)in Al-PE-Pa complex packaging and analyze their interactive effect during hydrothermal liquefaction.At 360℃ and 20 MPa,the micro reaction still was used to conduct hydrothermal liquefaction reaction on paper fiber,low-density polyethylene and aluminum foil samples of single component,bi-component and three-component for 30 min to characterize the oil product yield,element composition,constituent and solid residue morphology,etc.The results showed that the bio-oil yield of the single-component paper fiber was 13.67%,but its oxygen content was as high as 24.19%.The single-component of low-density polyethylene(LDPE)was barely depolymerized at this condition.The yield of bio-oil(14.88%)was significantly higher than the theoretical yield(10.75%)of simple addition of single components.The hydrocarbon products in the oil were significantly increased.Ketones,esters and alcohols were all reduced.Aluminum foil could significantly reduce the oxygen content of the bio-oil from paper fiber,increase the heating value of the bio-oil,and significantly reduce the ester and phenol contents in the bio-oil.The bio-oil yield of three-component paper fiber,LDPE/aluminum foil increased from the theoretical calculated value of 10.21%to 19.00%.The high heating value increased from 28.80 MJ/kg to 30.04 MJ/kg.The oxygen content of oil decreased to 21.76%.And the ketones in the product components decreased significantly from 28.12%to 8.96%.Co-liquidation of paper fiber and LDPE has synergistic effect.The aluminum foil achieves site hydrogenation of oil products at hydrothermal conditions.The co-liquefaction of three-component paper fiber/LPDE/aluminum foil has superimposed effect of the synergistic effect of paper-plastic synergy and in-situ hydrogenation of aluminum-water reaction.