Study on Bleaching Process of Pre-hydrolyzed Bamboo Sulfate Pulp
Using pre-hydrolyzed sulfate unbleached bamboo pulp as raw material,the dissolved bamboo pulp was prepared by the bleaching process of"oxygen delignification(O)-first stage chlorine bleaching(D0)-oxygen and hydrogen peroxide enhanced alkali extraction(Eop)-second stage chlorine bleaching(D1)".The treatment conditions of each section were optimized(O bleaching stage:sodium hydroxide dosage of 2.0％,oxygen pressure of 0.5 MPa,reaction time of 60 min,reaction temperature of 95 ℃;D0 bleaching stage:chlorine dioxide dosage of 3.5％,reaction time of 80 min,reaction temperature of 70 ℃,the initial pH value of 4.0;Eop bleaching stage:hydrogen peroxide dosage of 1.4％,oxygen pressure of 0.2 MPa,reaction time of 90 min,reaction temperature of 90 ℃,initial pH value of 11.5;D,bleaching stage:chlorine dioxide dosage of 1.5％,the reaction time of 150 min,the reaction temperature of 70 ℃,the initial pH value of 4.0),and the final prepared bamboo pulp whiteness reached 82.7％,with viscosity of 440 mL/g,ash content of 0.24％,α-cellulose content of 90.92％.
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