Papers by Keyword: Alkali-Oxygen Pulping

Abstract: In this paper, the process of cellulase pretreatment before alkali-oxygen pulping of bagasse was studied. The effect of cellulase pretreatment on subsequent pulping was also researched. The results showed that some small-sized components and sugars dissolved into the effluent in the process of cellulase pretreatment. UV spectroscopy showed that there was no significant lignin content in the pretreatment effluent.It was also found that pulping properties were promoted when the cellulase dosage was 2 ECU/g pulp, in that under the same cooking conditions, pulp kappa number was decreased by 1.3 and pulp brightness was increased by 2.5 %ISO, while the viscosity of pulp also increased slightly. Moreover, the tensile index, tear index and folding endurance were increased by 8%, 7% and 30%, respectively, but burst index showed no significant change. The above results illustrated that cellulase pretreatment was only beneficial to the dissolution of sugars and fine components from bagasse and it was an effective method of promoting alkali-oxygen pulping of bagasse.

Abstract: In this paper, the bagasse wet-stored with hypochlorite (H) bleaching waste-water which was the original waste liquid from H bleaching process of bagasse, was cooked with alkali-oxygen and its pulping effect was studied. The results showed that the proper treatment time of wet storage with H bleaching waste-water was 12 days, the pulping properties were as follows: screened pulp yield 62.9%, kappa number 15.4, viscosity 802 mL/g, and brightness 58.8 %ISO. The strength properties of pulp were as follows: tensile index 65.6 N•m/g, tear index 5.86 mN•m2/g, burst index 3.83 kPa•m2/g and folding endurance 302 times. In addition, the pulping properties of bagasse wet-stored with H bleaching waste-water were similar to those of bagasse wet-stored with fresh water. Therefore, it can be concluded that the H bleaching waste-water could be used as spraying water for wet storage of bagasse. It was a new idea for saving fresh water in the pulping and papermaking industry.