Dissolving pulp from white press cuttings, TAPPI JOURNAL April 2016

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ABSTRACT: Upgrading of white press cuttings into dissolving pulp was carried out by acidification followed by alkaline extraction. Acid treatment decreased ash content of white press cutting pulp from 11.25% to 0.33% at pH 2. The yield after acidification and screening was 87%. Alkaline extraction removed hemicelluloses and increased α-cellulose content to 92% with viscosity value of 4.3 mPa.s. The overall pulp yield after alkaline extraction was 76.6%. Alkaline extracted liquor contains 9.2% total organics, mostly pentose sugars in the oligomeric form. The produced dissolving pulp can be used for rayon production.

Application: Acid treatment removes minerals and fillers, and alkaline extraction removes hemicellulose from white press cutting pulp, which makes it easier to convert white press cuttings into dissolving pulp.