| With the decrease of fossil resources gradually, energy problem is becoming a big problem for most countries in the world, and it is necessary to explore a new energy resource for dissolving the energy shortage. Bioenergy cause a great attention because of its regeneration and low pollution to the circumstance. Conversion of solid biomass into liquid mass, can not only supply a new type of biofuel, but also produce some chemicals. Therefore, to develop liquefaction technology will have a wide application prospective.In this thesis, the liquefaction of a rapid growth tree poplar wood using ethylene glycol (EG)and ethylene carbonate(EC) as liquefied solvents and methanesulfonic acid(MSA) as catalyst was carried out, and the effects of reaction temperature, time and catalyst dosage were discussed. Based on orthogonal experiments, the optimum conditions were determined. Under the optimum conditions, the relative liquefaction ratios were 92.8% and 96.9% respectively. IR analysis of reaction residues showed that lignin and hemicelluloses were easily liquefied while cellulose was not, so it was critical to improve cellulose liquefaction ratio in the liquefaction process.Burning value analysis of the liquefied products showed that the burning value increased 50% than that of the raw material, and it could be used as industrial fuel after simple treatments. Compounds in the liquefied products were identified by GC-MS .By comparison, it was found that EC was better than EG used as solvent though EC is more expensive. The liquefaction of poplar wood using EC as solvent had higher liquefaction rate, lower catalyst demand, higher burning value of its products, and easier solvent recycling.Using ethylene glycol and ethylene carbonate as solvents, methanesulfonic acid as catalyst, the liquefaction of poplar wood was systematically investigated. Our present study can provide a theoretical and experimental basis for further researches of biomass liquefaction.
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