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The present work demonstrated that secondary pulp/paper sludge powder, with a higher heating value of 18.3MJ/kg on a dry basis, could be effectively converted into liquid oil products by direct liquefaction in hot-compressed water with and without catalyst. Treatments of secondary pulp/paper sludge in water at 250–380°C for 15–120min in the presence of N 2 atmosphere resulted in yields of...
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