Study Of Formation Of Monosaccharides And Inhibitors During Extremely Low Acid Hydrolysis Cassava Residue Processes

To study temperature,time and acid concentration of extremely low acid(ELA)hydrolysis of cassava residue on pretreatment efficiency,the parameters of monosaccharides and inhibitors were selected.And performing PLS regression(PLSR)analyses was chosen to investigate the relationship of monosaccharides degradation and furfural formation.The results showed as follows:(1)Based on the analysis of the relationship between the dissolution of monosaccharides and inhibitor,the optimal process of cassava residue by ELA was 170 ?,0.05wt%H2SO4 and 120min.(2)For removing starch of cassava residue,the optimal process of cassava residue by ELA was 170 ?,0.05wt%H2SO4 and 60min.(3)Based on partial least square regression,comparison of cassava residue and removing starch of cassava residue,the parameters affecting furfural formation were 5-HMF,xylose,arabinose.However,the method of removing starch of cassava residue can be directly explained that the two pathway of furfural formation was pentose dehydration and HMF thermal cracking.(4)XRD and RAM showed,Cellulose was dehydrated and the molecular chain was arranged more orderly after the pretreatment of cassava residue by different acid concentrations;Raman analysis showed that the removal of cellulose and hemicellulose in the secondary wall,compound middle lamella,and the cell corners were caused by ELA hydrolysis of cassava residue,which were gradually removed over time.(5)TEM further showed that the lamellar structure of the cell wall of cassava residue was not destroyed.For high temperature conditions,the cassava residue cell wall was slightly bent and the thickness of S1 layer decreased.The results showed that the removing starch of cassava residue was more susceptible to temperature,and carbohydrate in the S1 layer was more easily removed.