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预水解硫酸盐竹浆的漂白工艺研究 |
Study on Bleaching Process of Pre-hydrolyzed Bamboo Sulfate Pulp |
收稿日期:2024-06-12 |
DOI:10.11980/j.issn.0254-508X.2024.07.004 |
关键词: 竹浆 氧脱木质素 ClO2漂白 Eop漂白 |
Key Words:bamboo pulp oxygen delignification ClO2 bleaching Eop bleaching |
基金项目:国家重点研发计划(2023YFD2201903);福建省引导性项目(2023H0008)。 |
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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80 min、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150 min、反应温度70 ℃、初始pH值4.0),最终制备白度82.7%、黏度440.0 mL/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; D1 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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