Application of the Enzymes in Soda-chemi-mechanical Pulp of Wheat Straw

Effect of 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 results showed that suitable xylanase dosage of pretreatment wheat straw was 15 IU/g (on oven dry wheat straw), and the suitable xylanase dosage of pretreatment wheat straw chemi-mechanical pulp was 12 IU/g (on oven dry pulp). Pretreatment time with xylanase was 120 min during chemi-mechanical pulping, and about the same during hydrogen peroxide bleaching of wheat straw bio-chemimechanical pulp that 74.6% ISO brightness of wheat straw bio-chemimechanical pulp could be achieved by XP5aP5a bleaching sequences.