硫酸盐竹浆氧脱木质素和全无氯漂白的研究  

Oxygen Delignification of Bamboo Kraft Pulp and Bleaching Effects Using Totally-chlorine-free Bleaching Sequences

作　　者：高慧[1,2] 詹怀宇[2] 

机构地区：[1]安徽农业大学林学与园林学院,安徽合肥230036 [2]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《林产化学与工业》2009年第4期41-46,共6页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(20477046);安徽农业大学创新团队资助(无编号)

摘　　要：通过比较不同条件下氧脱木质素后浆料的卡伯值、黏度、得率、白度和脱木质素选择性等指标,研究了硫酸盐竹浆卡伯值25.6氧脱木质素工艺参数,发现用碱量和温度是决定氧脱木质素效果的主要因素。最佳工艺条件为:用碱量3.5%,温度85℃,氧气压力0.6 MPa,保温时间80 min。两段氧脱木质素(中间不洗涤)可以提高木质素脱除率和选择性。研究还发现,在氧碱脱木质素过程中加入醌类混合物助剂(表示为Oq),可使浆料的黏度和氧脱木质素的选择性大大提高。采用OQ(PO)、(O1O2)Q(PO)、OQ(PO)1(PO)2和OqQ(PO)4种短漂序都可使竹浆白度达到80%(ISO)以上,且具有很好的白度稳定性。OQ(PO)、(O1O2)Q(PO)和OQ(PO)1(PO)23种漂序漂后浆纸页强度性能相近,OqQ(PO)漂后浆的抗张指数、撕裂指数和耐破指数明显高于其它3种漂序。Bamboo kraft pulp with a Kappa number 25.6 was sampled, and oxygen delignification and totally-chlorine-free bleaching sequences were applied to bleach these bamboo pulp samples. By investigating pulp yield, Kappa number, viscosity, brightness of pulp, and delignification-selectivity, it has been proven that caustic soda dosage and reaction temperature were major factors for oxygen delignification. The optimal conditions for oxygen delignification were proposed as follows： alkali dosage of 3.5 % on o.d. pulp-mass, reaction temperature 85 ℃ , oxygen pressure 0.6 MPa, and temperature retention time 80 min. Two stages of oxygen delignification were used and no washing was required between each stage. It was found that delignifieation efficiency and selectivity to lignin-removal were improved signifieantly. In addition, adding hydroquinone compounds （Oq） during oxygen delignifieation can improved greatly the qualities of delignified pulps such as higher viscosity and better selectivity of delignification. The brightness levels of all bleached pulps, using OQ （PO）, （O1O2 ） Q （PO）, OQ （ PO）1（PO） 2 and OqQ （PO） bleaching sequences, individually, were increased up to more than 80 % （ISO）. Strength properties of bleached pulps using OQ （PO）, （ O1O2 ） Q （PO） or OQ （PO） 1 （ PO）2 bleaching sequence, show insignificant differences, while tensile, tearing and burst indices of bleached pulp using OqQ（PO） bleaching sequence were remarkably higher than other three sequences.

关 键 词：硫酸盐竹浆 氧脱木质素 全无氯漂白 

分 类 号：TQ351.0[化学工程]