ELECTROCHEMICAL DELIGNIFICATION CATALYZED BY PMO7V5 AND FOLLOWING EQP BLEACHING OF POPLAR KRAFT PULP
The prepared polyoxometalate (POM), Na8PMo7V5O40-PMO7V5, as a mediator, was applied in the electrochemically mediated delignification （EM） of poplar kraft pulp. The delignification efficiency of this POM-mediated system and the following bleachability of delignified pulp using EQP were studied and discussed in this paper. The results showed that PMO7V5 was a suitable mediator for the electrochemical delignification of poplar kraft pulp. Under the optimum conditions, the Kappa number was reduced from 17.3 to 11.4 and viscosity was decreased from 1018cm3/g to 898 cm3/g. The alkali treatment after EM could further reduce Kappa number and increase the brightness of the electrochemical-PMO7V5 delignified pulp. The Kappa number of pulp treated with EME could be reduced to 8.5 with 924 cm3/g viscosity. For the pulp with 15.2 initial Kappa number, the EMEQP bleaching can bleach the pulp to 80.9 ％ ISO brightness at 3.0％ H2O2 dosage with 824 cm3/g of final viscosity.
poplar pulp electrochemical delignification hydrogen peroxide bleaching
Wang Shoujuan Kong Fangong Zhan Huaiyu Fu Shiyu Yang Guihua
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
585-588
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）