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2012•Journal of Cellulose Science and TechnologyRequires access

The Effect of Thermostable and Alkaline Tolerant Xylanase Pretreatment on the Bleaching Properties of Poplar Kraft Pulp

Sun Li-xin

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Abstract

The selectivity and its effect of the pretreatment on the elemental chlorine free(ECF) bleaching properties by a thermostable and alkaline tolerant xylanase X were studied.The results show that the pretreatment has high selectivity,without causing an obvious decrease of the pulp viscosity,the effective pretreatment conditions can be varied among 75～80℃ and pH 8.0～9.5,and the better pretreatment conditions were 80℃,pH 8.0 and enzymes dosage 2 IU/g.The final brightness of the bleached pulps with the pretreatment by the xylanase X was 1%ISO higher than that unpretreatment bleached pulps(90%ISO brightness),or the ClO2 dosage in the D0 stage could be saved by 26%～27% to achieve the same brightness(90%ISO) of the unpretreatment bleached pulp.

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What this paper is about

The selectivity and its effect of the pretreatment on the elemental chlorine free(ECF) bleaching properties by a thermostable and alkaline tolerant xylanase X were studied.The results show that the pretreatment has high selectivity,without causing an obvious decrease of the pulp viscosity,the effective pretreatment conditions can be varied among 75～80℃ and pH 8.0～9.5,and the better pretreatment conditions were 80℃,pH 8.0 and enzymes dosage 2 IU/g.The final brightness of the bleached pulps with the pretreatment by the xylanase X was 1%ISO higher than that unpretreatment bleached pulps(90%ISO brightness),or the ClO2 dosage in the D0 stage could be saved by 26%～27% to achieve the same brightness(90%ISO) of the unpretreatment bleached pulp.

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Available abstract

The selectivity and its effect of the pretreatment on the elemental chlorine free(ECF) bleaching properties by a thermostable and alkaline tolerant xylanase X were studied.The results show that the pretreatment has high selectivity,without causing an obvious decrease of the pulp viscosity,the effective pretreatment conditions can be varied among 75～80℃ and pH 8.0～9.5,and the better pretreatment conditions were 80℃,pH 8.0 and enzymes dosage 2 IU/g.The final brightness of the bleached pulps with the pretreatment by the xylanase X was 1%ISO higher than that unpretreatment bleached pulps(90%ISO brightness),or the ClO2 dosage in the D0 stage could be saved by 26%～27% to achieve the same brightness(90%ISO) of the unpretreatment bleached pulp.

Key concepts: Xylanase, Chemistry, Pulp (tooth), Kraft process, Selectivity, Chlorine, Pulp and paper industry, Kraft paper

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The Effect of Thermostable and Alkaline Tolerant Xylanase Pretreatment on the Bleaching Properties of Poplar Kraft Pulp — Research Paper | ScholarLens