A influência dos ácidos hexenurônicos no rendimento e na branqueabilidade da polpa kraft
Nenhuma Miniatura disponível
Data
2009-01-01
Autores
Ventorim, Gustavo [UNESP]
Caraschi, José Cláudio [UNESP]
Colodette, Jorge Luiz
Gomide, Jose Livio
Título da Revista
ISSN da Revista
Título de Volume
Editor
Soc Brasileira Quimica
Resumo
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.
Descrição
Palavras-chave
hexenuronic acid, pulping kraft, ECF bleaching
Como citar
Quimica Nova. São Paulo: Soc Brasileira Quimica, v. 32, n. 2, p. 373-377, 2009.