| Abstract:The effects of pretreatment temperature, acetic acid dosage and PFI revolutions on the enzymatic saccharification rate of acacia were discussed by acetic acid pretreatment, three-stage refining and PFI refining of wood chips. The structures of acacia before and after pretreatment were analyzed by XRD, SEM and TG-IR. The results show that acetic acid pretreatment can significantly increase the reducing sugar yield and solid content in the acetic acid extract of acacia, and the enzymatic hydrolysis sugar yield of the substrate after pretreatment also shows an upward trend to varying degrees. Under certain conditions, the higher the pretreatment temperature, the greater the acetic acid dosage or the more the PFI beating revolutions, the higher the total reducing sugar yield in the pretreatment and enzymatic hydrolysis conversion process, and the higher the weight loss of the corresponding raw materials. In addition, after acetic acid pretreatment, the microstructure and chemical composition of wood chips also change significantly. |