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A influência dos ácidos hexenurônicos no rendimento e na branqueabilidade da polpa kraft The influence of hexenuronic acids in yield and bleachability of pulp kraft

By Gustavo Ventorim, José Cláudio Caraschi, Jorge Luiz Colodette and José Lívio Gomide

Abstract

<abstract language="eng">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 OA HT D(EP)DD showed the lowest bleaching performance among all

Topics: hexenuronic acid, pulping kraft, ECF bleaching, Chemistry, QD1-999, Science, Q, DOAJ:Chemistry (General), DOAJ:Chemistry
Publisher: Sociedade Brasileira de Química
Year: 2009
DOI identifier: 10.1590/S0100-40422009000200019
OAI identifier: oai:doaj.org/article:99367011fbe84176abc1a353b246e0dd
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