摘要
本研究以预水解硫酸盐未漂竹浆为原料,采用"氧脱木质素(O)-氯漂(D0)-氧和过氧化氢强化碱抽提(Eop)-氯漂(D1)"的漂白工艺制备可用作溶解浆的竹浆.通过优化各工段的处理条件(氧漂白段:氢氧化钠用量2.0％、氧压0.5 MPa、反应时间60 min、反应温度95 ℃;D0漂白段:二氧化氯用量3.5％、反应时间80min、反应温度70℃、初始pH值4.0;Eop漂白段:过氧化氢用量1.4％、氧压0.2 MPa、反应时间90 min、反应温度90 ℃、初始pH值11.5;D1漂白段:二氧化氯用量1.5％、反应时间150min、反应温度70 ℃、初始pH值4.0),最终制备白度82.7％、黏度440.0mL/g、灰分含量0.24％、α-纤维素含量90.92％的竹浆.
Abstract
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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