Change of Chemical Composition and Chemical Element of Wheat Straw during Xylanase-soda Mechanical Pulping

Change of chemical composition and chemical element of hot water and xylanase pretreatment prior to soda treatment during chemi-mechanical pulping of wheat straw and hydrogen peroxide bleaching of wheat straw bio-chemimechanical pulp was studied. The chemical composition analysis results showed: Wheat straw contain some components that were dissolved easily in hot water and xylanase. Hot water and xylanase pretreatment prior to chemical treatment obviously enhanced soda delignifing of wheat straw. ESEM-EDAX analysis results showed: Wheat straw contains more mineral elements that weaken effect of xylanase on wheat straw; Alkali metal is easeful to dissolve in the hot water and xylanase. Alkali-earth metal and transition metal are difficult to dissolve during pulping and bleaching. In general, C/O element ratio can reflect change of lignin and carboxylic acid groups of wheat straw and wheat straw bio-chemimechanical pulp.