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- Warsta, Elina, et al. Show all 5 Authors
- Holzforschung 2016 v.70 no.7 pp. 603-609
- Pinus sylvestris; anthraquinones; cellulose; delignification; depolymerization; hemicellulose; lignin; pH; pulp; pulping; sodium carbonate; sodium hydroxide; sodium sulfite; softwood; sulfonic acid; temperature; viscosity
- ... 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 ...