ELECTROCHEMICAL DELIGNIFICATION MEDIATED WITH VIOLURIC ACID AND SUBSEQUENT ECF BLEACHABILITY OF DELIGNIFIED POPLAR KRAFT PULP
The electrochemically mediated delignification (EM) is one of the new methods for pulp delignification and bleaching. In this paper, the electrochemical delignification mediated with violuric acid (VIO) of the kraft pulps with different Kappa numbers was carried out. The subsequent bleachability of EM delignified pulps was studied using alkali extraction and chlorite dioxide bleaching. The ECF bleaching sequence containing EM stage was developed. The results showed that VIO was a suitable mediator for the electrochemical delignification of poplar kraft pulp. And this VIO-mediated delignification system had a good delignification ratio for different Kappa number pulps. The alkali treatment after EM could further reduce Kappa number and increase brightness of electrochemical-VIO delignified pulp. With the following EpD bleaching, the EM delignified pulp could be bleached to 80％ ISO at 1.0％ ClO2 with 849 cm3/g viscosity, or about 85％ ISO at 1.5％ ClO2 with 752 cm3/g viscosity. With the following EpD1D2 bleaching, the resulting brightness could reach 87.6％ ISO with 746 cm3/g viscosity at 1.5％ and 1.0％ ClO2 respectively in D1 and D2 stage.
poplar pulp electrochemical delignification chlorine dioxide
Kong Fangong Wang Shoujuan Fu Shiyu Zhan Huaiyu Han Jinmei
Key Laboratory of Pulp and Paper Engineering of Ministry of Education, Shandong Institute of Light I State Key Laboratory of Pulp & Paper Engineering,South China University of Technology, Guangzhou,510
国际会议
广州
英文
593-596
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）