Biobleaching of Poplar Kraft Pulp by New Xylanases
Pretreatment of poplar kraft pulp by new xylanases can reduce the dosage of chlorine,and improve pulp bleachability.AU xylanases which were suitable for the pretreatrnent of poplar kraft pulp were chosen,and the optimal conditions of the xylanase pretretment were selected in the paper.The influence on the bleachability of poplar pulp in different pH value,temperature and xylanase dosage were studied.The results showed that the optimal pH of AU-1 xylanase pretreating was 6 in which the brightness of bleached pulp was 77.5％ ISO,an increase of 1.8％ ISO than that of non-pretreated pulp,and the viscosity 620.2 mL/g.The optimal pH of AU-2 xylanase pretreating was 8 in which the brightness of bleached pulp was 77.7％ ISO,an increase of 0.8 ％ ISO than that of non-pretreated pulp,and the viscosity 578.1 ml/g.The optimal pH of AU-3 xylanase pretreating was 8～9 under the temperature of 70℃ and the 10 IU/gdosage of AU-3 xylanase in which the brightness of bleached pulp was 79.0％ ISO,an increase of 2.1％ ISO than that of non-pretreated pulp,and the viscosity 581.1 ml/g.Effects of AU-3 and AU-1 xylanases pretreatment on the results of CEH bleaching were better than that of AU-2 xylanase,and AU-3 xylanase was alkali-resistant.Biobleaching of the pulp by xylanase could reduce the dosage of chlorine and decrease pollution.
poplar kraft pulp CEH bleaching sequence xylanase biobleaching
GUIHUA YANG JIACHUAN CHEN KEFU CHEN
Guangdong Public Lab.of Paper Technology and Equipment,South China University of Technology,Guangzho Shandong Key Laboratory of Pulp & Paper Engineering,Shandong Institute of Light Industry,Jinan,25035 Guangdong Public Lab.of Paper Technology and Equipment,South China University of Technology,Guangzho
国际会议
第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)
天津
英文
472-474
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）