Abstract: The effects of five factors on residue rate during the liquefaction of branches of Fraxinus chinensis Roxb. in tetralin-phenol hydrogen-donor solvents were investigated by orthogonal test. The optimal conditions were:reaction temperature 150℃,time 2.5 h, mass ratio of wood to phenol 1:6,catalyst (H₂SO₄) dosage 6.5%, tetralin dosage 20%. The liquefaction efficiency was 96% in above conditions. The sequence of factors were: time>temperature>mass ratio of wood to phonol=catalyst dosage>tetralin dosage. The bigger of time, mass ratio of wood to phenol, and tetralin dosage, the smaller of residue rate of liquefaction or the higher of liquefaction efficiency.

Key words: Fraxinus chinensis Roxb, hydrogen-donor solvents, liquefaction