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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Gustavo Ventorim [1] ; José Cláudio Caraschi [2] ; Jorge Luiz Colodette [3] ; José Lívio Gomide [4]
Total Authors: 4
Affiliation:
[1] Universidade Estadual Paulista ‘Júlio de Mesquita Filho’. Departamento de Engenharia Industrial Madeireira - Brasil
[2] Universidade Estadual Paulista ‘Júlio de Mesquita Filho’. Departamento de Engenharia Industrial Madeireira - Brasil
[3] Universidade Federal de Viçosa. Departamento de Engenharia Florestal - Brasil
[4] Universidade Federal de Viçosa. Departamento de Engenharia Florestal - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Química Nova; v. 32, n. 2, p. 373-377, 2009-00-00.
Abstract

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. (AU)