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- W15790524 abstract "The remaining lignin content in chemical pulps is usually measured as the “Kappa Number” and, frequently, this number has been transformed into a corresponding amount of residual lignin. In this paper it is demonstrated that the kappa number does not correlate exactly with the amount of remaining lignin. Other oxidizable groups present in the pulp carbohydrates can also contribute and the extent of this contribution can vary largely depending on wood species and pulping procedure. In a subsequent bleaching operation these carbohydrate derived structures may or may not react depending on the bleaching agent(s) employed. This, in turn, can result in bleached pulps still having considerable amounts of reactive but colourless structures being chemically attached to the fibre polysaccharides. The major contribution from the carbohydrates to the kappa number is hexenuronic acid which is formed under alkaline pulping conditions. In addition, other, still unknown, carbohydrate structures formed in the pulping process can contribute to various extents depending on the process and wood species. In the paper, a summary of our present knowledge concerning the structure of the carbohydrate derived reactive structures in kraft pulp fibres, unbleached and bleached, is presented." @default.
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- W15790524 date "2001-01-01" @default.
- W15790524 modified "2023-10-16" @default.
- W15790524 title "NON-DESIRABLE CARBOHYDRATE REACTIONS IN PULPING AND BLEACHING" @default.
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- W15790524 doi "https://doi.org/10.1533/9781845693749.5.347" @default.
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