Violuric Acid Catalyzed Electrochemical Delignification and Bleaching of Poplar Kraft Pulp
Violuric Acid Catalyzed Electrochemical Delignification and Bleaching of Poplar Kraft Pulp
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紫尿酸催化杨硫酸盐浆电化学脱木质素和漂白
DOI：
10.4028/www.scientific.net/amr.113-116.2067
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发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
Huaiyu Zhan
中科院分区：
文献类型：
--
作者：
Shoujuan Wang;Fangong Kong;Shiyu Fu;Huaiyu Zhan
木质纤维素纤维的电化学介导脱木素（EM）是纤维浆脱木素和漂白的新方法之一。介体的选择是建立脱木素体系的关键。本文选择紫尿酸（VIO）作为介体催化脱木素过程，对脱木素浆进行了催化脱木素及后续可漂性研究。以纸浆卡伯值和粘度为指标评价了催化脱木素效果。讨论了漂白废水的污染负荷。结果表明，VIO是一种适合于电化学脱木素体系的介体。在最佳工艺条件下，改性淀粉的卡伯值从17.4降低到11.7，粘度从1144 cm ~ 3/g降低到1059 cm ~ 3/g，平均降低了5.4。EM后的碱处理可进一步降低纸浆卡伯值，提高纸浆白度。经EME处理的纸浆卡伯值可降至8.9，脱木素率为48.8%，粘度仅降至1065 cm ~ 3/g。EM-E处理后纸浆白度由原来的39.2%ISO提高到50.7%ISO。EM处理后的纸浆可在2.0%H_2O_2用量下用后续的QP或EQP漂白程序漂白至80%ISO。EMQP漂白废水的COD和BOD均低于OQP漂白废水，是一种环境友好的漂白工艺。
The electrochemically mediated delignification (EM) of lignocellulosic fibers is one of new methods for fiber pulp delignification and bleaching. The choice of mediator is a key to the foundation of the delignification system. In this paper, violuric acid (VIO) was selected as a mediator to catalyze this delignification process, and the catalyzing delignification was carried out as well as subsequent bleachability of delignified pulps. The catalyzing delignification efficiency was evaluated according to pulp kappa number and viscosity. The pollution loads of bleaching effuluents were discussed. The results showed that VIO is a suitable mediator for the electrochemical delignification system. At the optimum conditions, the kappa number reduces by 5.4, from 17.4 to 11.7, and viscosity decreases from 1144cm3/g to 1059cm3/g. The alkali treatment after EM can further reduce kappa number and increase brightness of resulting pulp. The kappa number of pulp treated with EME can be reduced to 8.9 with the delignification rate of 48.8% and viscosity only decreases to 1065 cm3/g. The brightness of EM E treated pulp increases from original 39.2% ISO to 50.7% ISO. The EM treated pulps can be bleached to 80%ISO with the subsequent QP or EQP bleaching sequences at 2.0% H2O2 charge. The bleaching effluents of EMQP have lower COD and BOD than that of OQP which is considered as environmental friendly bleaching sequence.
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DOI：
10.1149/1.3493959
发表时间：
1938
期刊：
Transactions of the Electrochemical Society
影响因子：
--
作者：
U. Pomilio
通讯作者：
U. Pomilio
影响因子：
3.9
作者：
D. Rochefort;R. Bourbonnais;D. Leech;S. Renaud;M. Paice
通讯作者：
D. Rochefort;R. Bourbonnais;D. Leech;S. Renaud;M. Paice
DOI：
--
发表时间：
1998
期刊：
Journal of Beijing Forestry University
影响因子：
--
作者：
Yao Chun-li;Pu Junwen
通讯作者：
Yao Chun-li;Pu Junwen
影响因子：
3.9
作者：
M. Mickel;Hee‐Cheol Kim;S. Noll;N. Hampp
通讯作者：
M. Mickel;Hee‐Cheol Kim;S. Noll;N. Hampp