Bio-crude production from secondary pulp/paper-mill sludge and waste newspaper via co-liquefaction in hot-compressed water |
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Authors: | Linghong ZhangPascale Champagne Chunbao Xu |
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Affiliation: | a Department of Civil Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada b Department of Chemical Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada c Department of Chemical Engineering, Lakehead University, Thunder Bay, ON P7B 5E1, Canada |
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Abstract: | Co-liquefaction of secondary pulp/paper-mill sludge (solids concentration: 1.6 wt%) and waste newspaper with a total solids concentration of 11.3 wt% was investigated with and without the addition of catalysts in a 75 ml Parr High-Pressure reactor at temperatures of 250-380 °C for 20 min. The yield of heavy oil (HO) without catalyst was between 16.7 and 28.0 wt% within this temperature range, and peaked at 350 °C. The addition of HCO2H, FeS, or KOH at 5 wt% of the total solids (on a dry basis) was found to enhance the HO yield at 300 °C, particularly HCO2H, which increased the yield of HO from 24.9 to 34.4 wt%. More interestingly, synergistic effects between secondary pulp/paper-mill sludge and waste newspaper were observed in the co-liquefaction operations. For example, the HO yield attained was 26.9 wt% at 300 °C in the co-liquefaction of the mixture of 33 wt% sludge and 67 wt% waste newspaper, and was noted to be 9 wt% and 6 wt% higher than the yields obtained from liquefaction of sludge and waste newspaper alone, respectively. The HOs from liquefaction or co-liquefaction at 300 °C for 20 min exhibited significantly higher energy contents (HHV ≥ 30 MJ/kg), almost doubled those (˜16 MJ/kg) of the original feedstocks. |
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Keywords: | Co-liquefaction Secondary pulp/paper-mill sludge Waste newspaper Heavy oil (HO) |
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