Papers by Author: Bing Sun

Abstract: In this paper, the effect of hemicellulase treatment on the properties of bagasse and treatment liquor was investigated, and the chemical components of bagasse after optimized hemicellulase treatment were compared with those of wet-stored bagasse. The research results showed that small molecular sugar and lignin in bagasse were dissolved in hemicellulase treatment process, and most of the sugar was non reducing sugar. The lignin dissolution rate of hemicellulase treatment was twice as much as that of wet storage, and hemicellulase treatment had relatively smaller effect on carbohydrate, especially to cellulose. In addition, the improving effect of bagasse properties with pulpzyme HC treatment was better than that of Nz51024 treatment.

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.