Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Kraft Pulping of Sapwood-A Sawmill Waste

  • Jahant M. Sarwar (Pulp and paper research Division, BCSIR Laboratories) ;
  • Chowdhury D.A. Nasima (Pulp and paper research Division, BCSIR Laboratories) ;
  • Islam M. Khalidul (Pulp and paper research Division, BCSIR Laboratories) ;
  • Mun Sung Phil (Division of Forest Science, College of Agriculture and Life Sciences, Chonbuk National University)
  • Published : 2005.12.01
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Abstract

This paper deals the effect of anthraquinone (AQ) on the contribution of sulphidity in kraft pulping of sapwood. The pulping conditions namely- active alkali concentration, pulpingtime, temperature and liquor ratio were varied in low ($15\%$) and high ($30\%$) sulphidity. $0.1\%$ AQ was added in the low and high sulphidity pulping with varying active alkali concentration and cooking time. At optimum conditions, low sulphidity kraft process produced about $44\%$ pulp yield with kappa number of about 23. But in high sulphidity kraft process kappa number was reduced to about 20 at the same yield. An addition of AQ reduced alkali requirement by $2\%$ on oven dried raw material and cooking time by 1 hour to produce pulp yield of about $44\%$ at kappa number 20. AQ is more effective in low sulphidity pulping than the high sulphidity pulping. The breaking length of kraft-AQ pulp was slightly higher than that of kraft pulp.

Keywords

References

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