Bleaching of Bamboo (Phyllostachys bambusoides) Kraft-AQ Pulp with Sodium Perborate Tetrahydrate (SPBTH) after Oxygen Delignification
Year: 2013
Type: article
Abstract: The most prominent environmental problems facing the paper industry are those due to bleaching processes that use chlorine compounds.In this study, totally chlorine free (TCF) bleaching sequences were applied to Phyllostachys bambusoides bamboo unbleached kraft anthraquinone (AQ) pulp, using different conditions with Oxygen (O) delignification and Sodium Perborate Tetrahydrate (SPBTH) stages.The effects of oxygen pressure, SPBTH ratio, and bleaching time were studied to maximize the brightness gain at the lowest viscosity loss.Unbleached kraft-AQ bamboo pulp was applied to first stage oxygen delignification for bleaching with under 5 bar, 3% NaOH, and 12% concentration conditions.Following the chelated bleaching, Sodium Perborate Tetrahydrate (SPBTH) bleaching was carried out as the final stage.The optimum bamboo kraft pulp bleaching conditions were SPBTH level: 4%, MgSO 4 : 0.5%, Na 2 SiO 3 : 3%, bleaching time: 80 min., reaction temperature: 70°C, and concentration: 12%.An overall increase in the physical properties of paper was evident up to an SPBTH level of 4%.When the SPBTH level and bleaching time increased, the kappa number, viscosity, opacity, and yellowness were decreased, but the brightness was increased.Oxygen delignification with chelatation and SPBTH as a bleaching sequence was shown to be a promising alternative to produce high-quality pulp from bamboo for cleaner paper.
Source: BioResources
Authors: Onur Tolga Okan, İlhan Deniz, İbrahim Yildirim
Institution: Karadeniz Technical University
Language: English
Topic: Lignin and Wood Chemistry
Subfield: Process Chemistry and Technology
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,452
OpenAlex ID: W2015246802