Abstract: After the furfural their residues were pretreated with sodium hydroxide, its composition, crystallinity, surface properties, infrared spectrum and their effects on enzymatic hydrolysis were compared with those without pretreatment. The results showed that the lignin removal proportion increased with the increase of temperature by NaOH pretreated. At 120 ℃, the lignin removal rate was 10.22 %, but it reached 12.6 % for alkaline hydrogen peroxide pretreated sample. The enzymatic hydrolysis rate of samples decreased when the pretreated temperature increased. After enzymolysis for 72 h by loading 12 FPU cellulase and 15 IU cellobiase per gram cellulose, the yield of saccharification was 38.6% by pretreatment of NaOH at 120 ℃, which is 21.0 percent point lower than that of raw material. However, by using alkaline hydrogen peroxide as pretreat agent under the conditions of 60 ℃, 6 h, the yield of saccharification was up to 86.6 % after enzymolysis for 72 h, which was 27.0 percent point higher than that of raw material. The FT-IR spectrum of the sample pretreated by NaOH suggested that new ether boned was generated. The crystallinity of pretreated sample was slightly higher and its surface was smoother than that of untreated sample.

Key words: furfural residues, alkali pretreatment, hydrogen peroxide, cellulose enzymatic hydrolysis, lignin