Abstract
The perform ance of commercial xylanases in totally chlorine-free bleaching of kraft pulp from conifer was tested with Pulpzyme HC (Novo Nordisk) and Cartazyme NS-10 (Sandoz/Clariant), at 500 U/kg of dry pulp, respectively. The treatment with Pulpzyme (Xp) or Cartazyme (Xc) has been combined with stages of bleaching using: oxygen (O), sulfuric acid (A), and extraction with hydrogen peroxide (Eop). The following sequences have been tested: OXpAEop, OXcAEop, XpOAEop, XcOAEop and OAEop, Kraft pulp bleached at the Klabin industrial plant using the sequence, CEH (chlorine, alkaline extreaction, and hypochlorination) was, used for comparison. The following average values were obtained: 1. Kappa number: OXpAEop, 4.8; OXcAEop, 4.9; XpOAEop, 5.0; XcOAEop, 4.9; OAEop, 5.6, and CEH, 1.9; 2. Brightness (% ISO values): OXpAEop, 68.4; OXcAEop, 70.1; XpOAEop, 67.9; XcOAEop, 26.9; XpOAEop, 23.4; XcOAEop, 23.1; OAEop, 25.4, and CEH, 25.2. Pulps that were treated with xylanases, before or affer the delignification with oxygen, have shown reduced kappa number and higher brightness than the pulp OAEop, Enzyme treatment before delignification with oxygen reduces pulp viscosity. Brightness obtained for pulp produced with bleaching sequences containing the enzymatic treatment, when compared with the control, CEH, shows that the xylanases enhance the action of the bleaching agents.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
de Araújo, J. H. B. (1997), Utilização de xilanase comercial em sequências de branqueamento totalmente livre de cloro (TCF) de polpa kraft de coníferas. M. Sc. Thesis, Universidade Estadual de Maringá, Maringá-PR.
de Araújo, J. H. B., de Moraes, F. F., and Zanin, G. M. (1997), in Proceedings of the Fifth Brazilian Symposium on the Chemistry of Lignins and Other Wood Components, Sépia Editora e Gráfica Ltda, Curitiba-PR, Brazil, pp. 357–366.
Paice, M. G., Gurnagul, N., Page, D. H., and Jurasek, L. (1992), Enzyme Microb. Technol. 4, 272–276.
Scott, B. P., Young, F., and Paice, M. G. (1992), in 79th Annual Meeting, Technical Section, CPPA, B167–B173.
Senior, D. J., Hamilton, J., Bernier, R. L., and Du Mamoir, J. R. (1992), Tappi J. 75, 125–130.
Yang, J. L., Lou, G., and Eriksson, K. E. L. (1992), Tappi J. 75, 95–101.
Yang, J. L., Sacom, V. M., Law, S. E., and Eriksson, K. E. L. (1993), Tappi J. 76, 91–96.
Yang, J. L., Cates, D. H., Law, S. E., and Eriksson, K. E. L. (1994), Tappi J. 77, 243–250.
Jurasek, L. and Paice, M. G. (1992), in Proceedings of the International Symposium on Pollution Prevention in the Manufacture of Pulp and Paper—Opportunities and Barriers, Office of Pollution Prevention and Toxics for the U.S. Environmental Protection Agency, Washington, D.C., pp. 105–107.
Tolan, J. S. and Spence, M. (1995), in 82nd Annual Meeting, Technical Section, CPPA, A21–A27.
Timonen, M. (1997), in Workshop of the International Energy Agency on Biotechnology Applied to Lignocellulosic Materials, Sépia Editora e Gráfica Ltda, Curitiba-PR, Brazil.
Jurasek, L., Archibald, F. S., Bourbonnais, R., Paice, M. G., and Reid, I. D. (1994), in Proceedings of 1994 TAPPI Biological Sciences Symposium and 2nd International Symposium on the Applications of Biotechnology to Tree Culture, and Utilization, Minneapolis, MN, 1994.
D'Almeida, M. L. O. (1988), in Celulose e papel: Tecnologia de Fabricação de Pasta Celulósica. v. 1, 2n edição, SENAI, Departamento Regional de São Paulo, Escola Theobaldo de Nigris, São Paulo, Brasil, pp. 107–127.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
De Araújo, J.H.B., de Moraes, F.F. & Zanin, G.M. Bleaching of kraft pulp with commercial xylanases. Appl Biochem Biotechnol 79, 713–722 (1999). https://doi.org/10.1385/ABAB:79:1-3:713
Issue Date:
DOI: https://doi.org/10.1385/ABAB:79:1-3:713