THE INFLUENCE OF HEXENURONIC ACIDS IN YIELD AND BLEACHABILITY OF PULP KRAFT

被引：10

作者：

Ventorim, Gustavo ^{[1
]}

Caraschi, Jose Claudio ^{[1
]}

Colodette, Jorge Luiz ^{[2
]}

Gomide, Jose Livio ^{[2
]}

机构：

[1] Univ Estadual Paulista, Dept Engn Ind Madeireira, BR-18409010 Itapeva, SP, Brazil

[2] Univ Fed Vicosa, Dept Engn Florestal, BR-36571000 Vicosa, MG, Brazil

来源：

QUIMICA NOVA | 2009年 / 32卷 / 02期

关键词：

hexenuronic acid; pulping kraft; ECF bleaching; DEGRADATION;

D O I：

10.1590/S0100-40422009000200019

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This study investigated the impact of pulp hexenuronic acids (HexAs) content on pulping yield by changing cooking reaction temperature. The bleachability of pulps containing variable amounts of HexAs was also investigated. The cooking at 170 degrees C produced pulp of kappa number, HexAs and screen yield of 16.2, 49.4 mmol/kg and 50.2%, respectively, whereas the cooking at 156 degrees C resulted pulp of kappa 17.0, 61.3 mmol/kg HexAs and 50.8% screened yield. The pulp produced at lower cooking temperature also showed better bleachability as evaluated by the total amount of active chlorine required to achieve 90% ISO. The sequence OAHTD(EP) DD showed the lowest bleaching performance among all.

引用

页码：373 / 377

页数：5