Hydrothermal liquefaction technology was applied for treating waste Al-PE-Pa laminated packaging for bio-oil production at 360 °C, 20 MPa and 30 min. Ni10Cex/Al2O3 catalyst was used to upgrade the quality of bio-oil. The effect of Ni:Ce on bio-oil yield, elements and compounds distributions were investigated. Results showed that the maximum bio-oil yield of 35.53 wt% was obtained with 5 wt% Ce loading. In addition, the O content decreased from 21 wt% without catalyst to 15% with Ni10Ce5/Al2O3 catalyst. The interactions between Ce and Ni facilitate the dispersion of the active metals and promoted the hydrodeoxidation reactions. The main content of the bio-oil produced with Ni10Ce5/Al2O3 catalyst was diesel oil, which mainly due to the accelerated degradation of the long chain C-C bond in paper fibre and PE. This study provided a new approach for waste Al-PE-Pa laminated packaging treatment.

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The waste Tetra pack impose a great pressure on environment. In this paper, we use hydrothermal liquefaction technique to convert it into valuable crude oil. The paper fibre and LDPE were studied in supercritical water at 420 °C, 25 MPa and residence time of 30 min. Effect of paper fibre: LDPE on the crude oil yield, components distribution and high heat value were investigated in depth. Results showed that maximum crude oil yield of 27.33 wt% was obtained at paper fibre to LDPE of 8:2, minimum O/C of 0.094 was obtained at paper fibre to LDPE of 5:5, which reflect that HTL of paper fibre and LDPE had a synergetic effect. And the highest high heat value of the crude oil reach 37.7 MJ/kg at the ratio of 5:5• The CH radicals produced from LDPE chain can promote the hydrogenation reaction that then decrease the production of oxygen-containing groups, and also the broken of C-C bond in lignin will be accelerate, which increased the diesel (C16-C47) compound.