NDLI: Bleaching of kraft pulp with commercial xylanases

Content Provider	Springer Nature Link
Author	De Araújo, José H. B. Moraes, Flávio F. Zanin, Gisella M.
Copyright Year	1999
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 (X$_{p}$) or Cartazyme (X$_{c}$) has been combined with stages of bleaching using: oxygen (O), sulfuric acid (A), and extraction with hydrogen peroxide (E$_{op}$). The following sequences have been tested: OXpAE$_{op}$, OXcAE$_{op}$, XpOAE$_{op}$, XcOAE$_{op}$ and OAE$_{op}$, 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: OX$_{p}$AE$_{op}$, 4.8; OX$_{c}$AE$_{op}$, 4.9; XpOAE$_{op}$, 5.0; XcOAE$_{op}$, 4.9; OAE$_{op}$, 5.6, and CEH, 1.9; 2. Brightness (% ISO values): OX$_{p}$AE$_{op}$, 68.4; OX$_{c}$AE$_{op}$, 70.1; X$_{p}$OAE$_{op}$, 67.9; X$_{c}$OAE$_{op}$, 26.9; X$_{p}$OAE$_{op}$, 23.4; X$_{c}$OAE$_{op}$, 23.1; OAE$_{op}$, 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 OAE$_{op}$, 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.
Starting Page	713
Ending Page	722
Page Count	10
File Format	PDF
ISSN	02732289
Journal	Applied Biochemistry and Biotechnology
Volume Number	79
Issue Number	1-3
e-ISSN	15590291
Language	English
Publisher	Humana Press
Publisher Date	1999-01-01
Publisher Place	Totowa
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Environmental Engineering Biochemistry Bioengineering Applied Microbiology and Biotechnology Biotechnology

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