Delignification of bagasse by using separate alkali and Caro's acid treatments

Bagasse delignification by using separate alkali and Caro's acid treatments is considered as a promising process to prepare high yield bagasse pulp. This could be achieved via-two-stage technique (NaOH/Caro's acid) and three-stage technique (NaOH/Caro's acid/NaOH) The two techniques were practiced at low temperatures and atmospheric pressure. Three-stage techniques provide a possibility to produce chemical pulps, which have the advantages of both mechanical pulp (high yield pulp), and chemical pulp (good strength properties). At moderate concentration of Caro's acid used (3.0, 4.5% based on raw materials), three-stage technique has higher delignification selectivity than that of two-stage technique. Three-stage techniques produced pulps of higher breaking length and burst factor than that produced by two-stage techniques. Tear factor of pulps produced by two-stage techniques has the superiority.