The influence of hexenuronic acids in yield and bleachability of pulp kraft

Quimica nova

Ventorim, Gustavo¹  Caraschi, José Cláudio¹  Colodette, Jorge Luiz²  Gomide, José Lívio² 

[1] Universidade Estadual Paulista ‘Júlio de Mesquita Filho’, Itapeva, Brasil;Universidade Federal de Viçosa, Viçosa, Brasil

关键词: hexenuronic acid;    pulping kraft;    ECF bleaching.;   

DOI  :  10.1590/S0100-40422009000200019

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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 ºC 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 ºC 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.

【 授权许可】

CC BY