采用混合过氧酸预处理和无氯漂白程序制备杨木漂白KP浆的研究

Study on Producing BKP with the Mixed-peroxyacid Pretreatment and Non-chlorine Bleaching Sequence

进行了采用混合过氧酸预处理和无氯漂白程序制备杨木全漂ＫＰ浆的研究。过氧酸预处理提高了氧脱木素段脱木素的选择性，预处理和氧漂后的浆料再经短程序ＥＣＦ和ＴＣＦ漂白，能制得较高白度的纸浆。

The use of a mixed-peroxyacid solution pretreatment and non-chlorine bleaching processes to produce the bleached poplar kraft pulp is studied.The results show that the lignin content of poplar KP (kappa number 23.1,viscosity 1265ml/g and ISO brightness 35.4%)can be decreased by 39.8% and 55.8% by mixed-peroxyacid(Pxa) pretreatment(0.4% active oxygen content )and the subsequent oxygen delignification respectively,and the related pulp brightness is 42.8%(ISO) and 55.3%(ISO).The mixed-peroxyacid pretreatment can improve the delignification selectivity in oxygen bleaching stage.The pulp which is pretreated with Pxa and bleached with oxygen can be bleached to higher brightness by short-sequence ECF and TCF.For example,the pulp with 85.7% ISO brightness can be obtained by DEpP Sequence.The physical properties of a various of pulps are also researched.