Fig. 5

DDR corn stover solids (CS) composition compared to raw corn stover. Following the same trend as was observed with just deacetylated corn stover, the acetyl composition is minimal while the lignin composition decreases with the increase of sodium hydroxide. Xylan composition remains consistent throughout the severity curve whereas glucan increases with severity due to the loss of lignin. The residence time and gap space for disc-refining does not appear to affect the overall composition of DDR corn stover. X/Y/Z represents NaOH conc (g/kg)/residence time (min)/disc-refining gap (in.)