Hydrolysis of Corn Straw to Produce Reducing Sugar by Diluted Acid Over Ferrous Sulfate Under Microwave Radiation

The corn straw was hydrolyzed by diluted acid via microwave radiation under the conditions of the metal salt ferrous sulfate as catalyst.The effect on the reducing sugar production rate was investigated by the concentration of ferrous sulfate,sulfuric acid content,ratio of liquid to solid,the microwave radiation power,time and pressure.The results show that the product yield can reach 38.5% under the best hydrolysis conditions:ferrous sulfate mass fraction of 3%,sulfuric acid mass fraction of 2%,mass ratio of liquid to solid 15,the microwave radiation power 187.5 W,the microwave radiation time 30 min and the microwave radiation pressure 0.3 MPa.Compared to the method without ferrous sulfate or without microwave radiation,this method shows higher yields by 1.1 and 2.8 times,respectively.