The effects of the reaction time, the reaction temperature, the dosages of catalyst, phenol, and tetralin on the liquefaction ratio of the Salix psammophila with phenol-tetralin as the hydrogen-donor solvents are investigated by orthogonal and single factor tests. The optimal conditions are found as follows: the reaction temperature is 120℃, the time duration is 2 h, the phenol dosage is 15 g, the catalyst (98%H₂SO₄) dosage is 1 mL, the tetralin dosage is 5 mL. The liquefaction efficiency is 97.51% under these conditions. The order of importance of these factors is: Reaction temperature > reaction time > dosage of catalyst > dosage of tetralin > dosage of phenol. The infrared spectrograms of the liquid products at different reaction times in the liquefaction see new peaks before 30 min and have similar spectrogram characterizations after 30 min. The FTIR of the solid residue indicates that the hemi-cellulose and the lignose are degraded firstly. The fractures of the spatial network structures of the lignin formed by the ether bonds precede those of the carbon-carbon bonds among aromatic nucleus, and the pyranose rings and the hydroxyl bonding groups are contained in the final solid residue of liquefaction. The thermogravimetric analysis of the solid residue suggests that the organic matter in the product is gradually reduced along with the liquefaction. And the pyrolysis reaction shows obvious phases and is divided into two stages.

Salix psammophila  /  phenol-tetralin mixed solvent  /  liquefaction products  /  solid residue