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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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The formation of LC and other aromatic end-group structures in O-alkyl-substituted cellulose during kraft pulping conditions

Journal of Wood Science volume 53, pages 229–233 (2007)Cite this article

Abstract

Ultraviolet resonance Raman spectroscopy (UVRRS) was used to study the formation of aromatic and/or lignin-carbohydrate (LC) structures at the reducing end groups of O-alkyl-substituted cellulose under conditions simulating the initial phase of kraft pulping. The derivatives studied were methyl cellulose (MC) with degree of substitution (DS) of 1.64–1.95, carboxymethyl cellulose (CMC) with DS ∼0.6, and a lignin model compound, creosol. The total alkali concentrations in the treatments were 0.1 M and 0.5 M and the sulfidities were 1%, 10%, and 30%. HS− ions and creosol are both strong nucleophiles and they compete for the hot-alkali-generated unsaturated electrophilic reaction sites in the reducing end groups of the polysaccharides. The results indicated that conditions similar to those in the initial phase of conventional kraft cooking (high OH− and low HS− ion concentrations) increased the aromatic nature of the end groups and conditions similar to those in the initial phase of super batch cooking (low OH− and high HS− ion concentrations) partly inhibited the formation of aromatic and LC end groups.

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Authors and Affiliations

  1. Laboratory of Forest Products Chemistry, Helsinki University of Technology (TKK), PO Box 6400, Espoo, FIN-02150, Finland

    Anne Vikkula & Tapani Vuorinen

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  1. Anne Vikkula
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  2. Tapani Vuorinen
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Correspondence to Anne Vikkula.

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Vikkula, A., Vuorinen, T. The formation of LC and other aromatic end-group structures in O-alkyl-substituted cellulose during kraft pulping conditions. J Wood Sci 53, 229–233 (2007). https://doi.org/10.1007/s10086-006-0849-5

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  • DOI: https://doi.org/10.1007/s10086-006-0849-5

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