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THE EFFECT OF XYLANASE PRETREATMENT ON PEROXIDE BLEACHING OF WHEAT STRAW SODA-AQ PULP

Li Cai, Cécile Sigoillot

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Abstract

The peroxide bleachabilities of xylanase pretreated wheat straw Soda AQ pulps, physical properties of bleached pulps as well as post color, viscosity etc. were investigated. Wheat straw pulps were pretreated by xylanase at an optimized condition, followed by an alkaline extraction stage. Both of original pulps and enzymatic treated sample were bleached by using a standard peroxide bleaching sequence. The results indicate: At the same brightness level of bleached pulps, enzymatic bleaching operation could save more than 40% of peroxide than that of the reference pulp, with less losses of the pulp physical strength; Drainability of bleached pulp was improved significantly. Such operation also provides bleached pulps with a higher brightness stabilization

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What this paper is about

The peroxide bleachabilities of xylanase pretreated wheat straw Soda AQ pulps, physical properties of bleached pulps as well as post color, viscosity etc. were investigated. Wheat straw pulps were pretreated by xylanase at an optimized condition, followed by an alkaline extraction stage. Both of original pulps and enzymatic treated sample were bleached by using a standard peroxide bleaching sequence. The results indicate: At the same brightness level of bleached pulps, enzymatic bleaching operation could save more than 40% of peroxide than that of the reference pulp, with less losses of the pulp physical strength; Drainability of bleached pulp was improved significantly. Such operation also provides bleached pulps with a higher brightness stabilization

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Available abstract

The peroxide bleachabilities of xylanase pretreated wheat straw Soda AQ pulps, physical properties of bleached pulps as well as post color, viscosity etc. were investigated. Wheat straw pulps were pretreated by xylanase at an optimized condition, followed by an alkaline extraction stage. Both of original pulps and enzymatic treated sample were bleached by using a standard peroxide bleaching sequence. The results indicate: At the same brightness level of bleached pulps, enzymatic bleaching operation could save more than 40% of peroxide than that of the reference pulp, with less losses of the pulp physical strength; Drainability of bleached pulp was improved significantly. Such operation also provides bleached pulps with a higher brightness stabilization

Key concepts: Xylanase, Pulp (tooth), Peroxide, Straw, Chemistry, Pulp and paper industry, Kappa number, Kraft process

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