ECF Bleaching of Pre-Hydrolyzed Larix Kraft Pulp for Production of Dissolving Pulp

Abstract:

Elemental Chlorine Free (ECF) bleaching sequence of O₁/O₂D₀E_OPD₁D₂ was adopted to bleach the pro-hydrolyzed Larix kraft pulp, where O₁/O₂ was two-stage oxygen delignification without interstage treatment, D was chlorine dioxide bleaching, EOP was pressurized alkaline extraction strengthened by hydrogen peroxide. Keeping bleaching temperature and time unchanged, sodium hydroxide charge(NaOH) in O₁ stage, chlorine dioxide(ClO₂) charge in D₀ stage and D₂ stage were studied, pulp properties such as brightness, kappa number, alpha-cellulose, pentosan and polymerization degree were measured and compared to establish optimal bleaching conditions. Results show that the optimal charge of NaOH in O₁ stage is 2.5%, ClO₂ in D₀ and D₂ stage are 2.5%, 0.6%, and the pulp gained at the optimal bleaching conditions has the properties of 93.9% of alpha-cellulose, 2.60% of pentosan, 375.5 ml/g of viscosity and 86.6%ISO of brightness.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 386-390
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.386
• Online since: January 2013
• Authors: Zhi Li, Jun Li, Jun Xu
• Keywords: Dissolving Pulp, ECF Bleaching, Larix, Reaction Property

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