Oxygen delignification: laboratory evaluation of the impact of dissolved organic matter, sodium carbonate and sodium thiosulfate
-
Caroline Wilke
,
Niclas Andersson
Abstract
Dissolved matter (DM) in the oxygen delignification (O2Del) stage affects the lignin and carbohydrate degradation. To understand this topic better, laboratory O2Del experiments were conducted with controlled addition of either unoxidized dissolved matter (UnoxDM) originating from the cooking stage or oxidized dissolved matter (OxDM) recycled from the post-O2Del washing. The presence of UnoxDM decreased the delignification, while the presence of OxDM showed the opposite effect, both compared to a well-washed pulp and at the same alkali charge level. However, both types of DM had a negative impact on the carbohydrate degradation. The distribution between these DMs will affect the resulting lignin degradation, because the filtrate accompanying the fibers into the O2Del stage is a mixture of UnoxDM and OxDM. It is proposed that the positive impact on the delignification by OxDM is due to the high carbonate ion concentration in the filtrate. Further, the high content of thiosulfate ions in the UnoxDM was one of the reasons for the lower delignification in its presence.
Acknowledgments
This study was performed within the Industrial Graduate School VIPP (Values Created in Fiber Based Processes and Products) at Karlstad University, Karlstad, Sweden.
Conflict of interest: No conflict of interest.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: With financial support from (i) the Knowledge Foundation, Stockholm, Sweden, (ii) BTG Instruments AB, Säffle, Sweden, and (iii) Karlstad University, Karlstad, Sweden.
Employment or leadership: Employment is BTG and Karlstad University, see affliation.
Honorarium: None declared.
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Articles in the same Issue
- Frontmatter
- Original Articles
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Articles in the same Issue
- Frontmatter
- Original Articles
- Synchrotron X-ray measurements of cellulose in wood cell wall layers of Pinus densiflora in the transmission and reflectance modes. Part 1: results without loading
- NIR hyperspectral imaging (NIR-HI) and μXRD for determination of the transition between juvenile and mature wood of Pinus sylvestris L.
- Characterization of the pits in parenchyma cells of the moso bamboo [Phyllostachys edulis (Carr.) J. Houz.] culm
- Identification of chemical constituents from the bark of Larix kaempferi and their tyrosinase inhibitory effect
- Oxygen delignification: laboratory evaluation of the impact of dissolved organic matter, sodium carbonate and sodium thiosulfate
- A study of thermo-hydro-treated (THT) birch wood by chemical analysis and Py-GC/MS
- Thermally modified (TM) beech wood: compression properties, fracture toughness and cohesive law in mode II obtained from the three-point end-notched flexure (3ENF) test
- Cellulolytic activity of brown-rot Antrodia sinuosa at the initial stage of cellulose degradation
- Ligninases remove phenolic inhibitors and facilitate yeast growth in lignocellulosic hydrolysate
- Development of a reinforced styrene-free unsaturated polyester composite based on bamboo fibers
- Functionalisation of poly(ethylene terephthalate) (PET) surfaces with two cationised xylans by means of two anchoring polymers
