Degradation of Lignin Induced by Microwave Treatment of Straw Pulp
Microwave-induced bleaching of straw pulp was carried out in a sequence consisting of sodium hypochlorite (H)and hydrogen peroxide(P).The effects of the microwave power,bleaching time and the consumption of sodium hypochlorite and hydrogen peroxide on the main physical properties of bleached pulp were investigated.The resultsshowed that the maximum brightness was achieved when the chemical consumption,the microwave power,and bleaching time were 8％,320W,and 2 minutes respectively for the H stage,and 1.5％,320W,1.5 minutes,respectively for the P stage.Under these conditions it was possible to achieve brightness of higher than 80％ ISO,as well as better brightness stability and pulp viscosity.A shortened bleaching time meant energy saving.Therefore microwave-induced bleaching could be an energy saving bleaching technology.The physical and surface properties of pulp fibers were investigated.The results showed that bleaching by microwave inducement could produce pulp with higher viscosity and reduced micro-fibers and fiber damage.The SEM and AFM of the bleached pulps from the control and microwave induced process support the advantages of the microwave-induced bleaching technology.
microwave HP bleaching energy saving
WANG YA-JUAN HAN QING LI DONG ZHAN HUAI-YU
College of Papermaking Engineering,Shaanxi University of Science & Technology,Shaanxi,710021,China State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou,Gu
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
233-236
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）