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Liquefacion of the waste wood by polyols in a microwave reactor
liquefaction biomass microwave pinus rigida;
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This study was performed to investigate a conversion method of biomass by liquefying wood using various glycols and acid catalyst and in addition, to find out the optimal condition for the enhancement of liquefaction yield and the reduction of liquefaction time using microwave pre-treatment system. Ethylene glycol and polyethylene glycol were utilized as solvent of wood liquefaction with acid catalyst of p-TSA and sulfuric acid(98%). The liquefaction of wood was conducted under the condition of 1-3% acid catalyst, 150-200 ℃ reaction temperature, and 300-700 W microwave power. The liquefaction reaction was enhanced with increasing reaction time in the case of 190 ℃ reaction temperature, 500 W microwave power, 3% sulfuric acid catalyst, PEG(#400) and EG. The utilization of EG increased the liquefaction yield by 97.85% after 5 minutes of reaction time compared to that of PEG(#400). In case of temperature 190 ℃, microwave power 500 W, 3% sulfuric acid, and EG liquefaction solvent, liquefaction yield was shown to be close to 100% within only 5 minutes for both acid catalysts, p-TSA and sulfuric acid, indicating that both acid catalysts of p-TSA and sulfuric acid would be effective for the liquefaction of wood. The liquefaction yield was augmented with increasing the dosing amount of acid catalyst; however, only 4% of acid catalyst would be enough to meet the goal of liquefaction yield. The liquefaction yield was enhanced by increasing reaction temperature under the condition of 500 W, EG catalyst, and 3% sulfuric acid concentration during 3 minutes, suggesting that the elevation of reaction temperature would be necessary enough to obtain high liquefaction yield. The highest liquefaction yield of 97.20% was obtained at the microwave power 600 W. However, the microwave power was not shown to be a critical factor influencing significantly on the liquefaction yield.