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Kraft pulping lignin reactions

The addition of anthraquinone (a chemical catalyst produced from coal tar) to the pulping liquor has been shown to speed up the kraft pulping reaction and increase yield by protecting cellulose fibers from degradation. The anthraquinone accelerates the fragmentation of lignin, allowing it to be... [Pg.880]

Condensation Reactions A variety of condensation reactions are known to occur in alkaline pulping. Since carbon-to-carbon linkages are formed between lignin entities, it has been proposed that as a result of condensation reactions, lignin dissolution is retarded, particularly during the terminal phases of kraft pulping. [Pg.132]

Marton J (1971) Reactions in alkaline pulping In Sarkanen KV, Ludwig CH (eds) Lignins Occurrence, formation, structure and reactions Wiley Interscience, New York, 639- 654 Marton J, Marton T (1964) Molecular weight of kraft lignins Tappi 47 471-476 Minor JL (1986) Chemical linkage of polysaccharides to residual lignin in loblolly pine kraft pulp J Wood Chem Technol 6 185 -201... [Pg.19]

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