关键词: 微波, ［Bmim］Cl, 离子液体, 稻草秸秆, 还原糖

Abstract: With ［Bmim］Cl as reactive medium, the enhancement of sulfuric acid hydrolysis process of rice straw was studied under microwave irradiation, and the reducing sugar was determined. The influences of ionic liquid volume, sulfuric acid concentration, microwave irradiation time, reaction temperature on yield of reducing sugar with acid hydrolysis of straw pole were mainly tested. Besides, by means of orthogonal experiment, the conditions for sulfuric acid hydrolysis of rice straw under microwaves irradiation were optimized. The results indicate that the best condition of acid hydrolysis of straw pole into reducing sugar in microwave irradiating is ［Bmim］Cl 10.0 ml, H₂SO₄ 10.0%, reactive temperature 85℃, reactive time 60 min, and the yield ratio of reducing sugar could reach 23.22% under the best condition, but the yield ratio of reducing sugar of the conventional acid hydrolysis is only 18.74%. Moreover, the hydrolysis residue and rice materials were characterized using the microscope and infrared spectra, the results show that the hydrolysis residue is thin and has the same structure as straw raw materials and both keep a good structure of cellulose.

Key words: microwave, ［Bmim］Cl, ionic liquid, straw pole, reducing sugar