Abstract
Sodium sulphite pulping of Scots pine chips in the initial pH range of 7.5–9 was investigated at 180°C and 165°C (for 120–240 min), using chemical charges between 25 and 50% and anthraquinone (AQ) charges 0–0.2%. As a result, pulps with yields of 52–73% and kappa numbers of 35–106 were produced. Delignification was accelerated by higher Na2SO3 charges and temperatures, and by AQ addition, whereas the effect of initial pH was negligible. The high pulp yields at a given kappa number were attributable to high retention of hemicelluloses, especially that of galactoglucomannan. The relatively low viscosities of pulps were apparently caused by depolymerisation of cellulose by sulphite. The sulphonic acid groups in the pulps correlated well with the residual lignin content, although some sulphonation of polysaccharides may also be possible. The results indicate that pulping of softwood in buffer-free (without Na2CO3 and/or NaOH) sodium sulphite liquor may result in pulps with tailored characteristics.
Acknowledgements
The research leading to these results was performed as part of the Value through Intensive and Efficient Fibre Supply (EffFibre) research programme of the Finnish Bioeconomy Cluster (FIBIC). The EffFibre programme received funding from Tekes – the Finnish Funding Agency for Technology and Innovation and from FIBIC Ltd.
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Characteristics of guaiacyl-syringyl lignin in reaction wood in the gymnosperm Gnetum gnemon L.
- Sodium sulphite pulping of Scots pine under neutral and mildly alkaline conditions (NS pulping)
- Characterization of dissolving pulp by fibre swelling in dilute cupriethylenediamine (CUEN) solution in a MorFi analyser
- Hot water extraction of Norway spruce (Picea abies [Karst.]) bark: analyses of the influence of bark aging and process parameters on the extract composition
- Statistical modeling of pressurized hot-water batch extraction (PHWE) to produce hemicelluloses with desired properties
- Lignification of ray parenchyma cells (RPCs) in the xylem of Phellodendron amurense Rupr.: quantitative and structural investigation by TOF-SIMS and thioacidolysis of laser microdissection cuts of RPCs
- Relationship between the hydrophilicity of lignin dispersants and their performance towards pesticide particles
- Preparation of electric double layer capacitors (EDLCs) from two types of electrospun lignin fibers
- Simultaneous measurement of elastic constants of full-size engineered wood-based panels by modal testing
- Development of an industrial applicable dielectric barrier discharge (DBD) plasma treatment for improving bondability of poplar veneer
- Mode of action of brown rot decay resistance of thermally modified wood: resistance to Fenton’s reagent
Articles in the same Issue
- Frontmatter
- Original Articles
- Characteristics of guaiacyl-syringyl lignin in reaction wood in the gymnosperm Gnetum gnemon L.
- Sodium sulphite pulping of Scots pine under neutral and mildly alkaline conditions (NS pulping)
- Characterization of dissolving pulp by fibre swelling in dilute cupriethylenediamine (CUEN) solution in a MorFi analyser
- Hot water extraction of Norway spruce (Picea abies [Karst.]) bark: analyses of the influence of bark aging and process parameters on the extract composition
- Statistical modeling of pressurized hot-water batch extraction (PHWE) to produce hemicelluloses with desired properties
- Lignification of ray parenchyma cells (RPCs) in the xylem of Phellodendron amurense Rupr.: quantitative and structural investigation by TOF-SIMS and thioacidolysis of laser microdissection cuts of RPCs
- Relationship between the hydrophilicity of lignin dispersants and their performance towards pesticide particles
- Preparation of electric double layer capacitors (EDLCs) from two types of electrospun lignin fibers
- Simultaneous measurement of elastic constants of full-size engineered wood-based panels by modal testing
- Development of an industrial applicable dielectric barrier discharge (DBD) plasma treatment for improving bondability of poplar veneer
- Mode of action of brown rot decay resistance of thermally modified wood: resistance to Fenton’s reagent