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The Chemistry of Lignin and its Removal

Lignin comprises about 17-33% of the dry weight of wood. It is a complex aromatic polymer which appears to function both as a strengthening agent in the composite wood structure and also as a component which assists in the resistance of the wood towards attack by micro-organisms and decay. [Pg.26]

The contribution of each of these three monomers to the lignin macromolecule differs depending on the source of the lignin. Gym-nosperm (softwood) lignin is based only on coniferyl alcohol, [Pg.26]

Although colored extracts may be separated from most woods by extraction with suitably neutral solvents, it is generally impossible to remove all the coloring matter in this way. This fact means that a considerable part of the coloring matter in wood may be present in macromolecular (insoluble) form, or so firmly bound to the skeleton components - lignin or polysaccharides - that it is not extract-able by means of neutral solvents without destroying the wood structure. Their chemistry is frequently very complex, and few of them have been investigated or elucidated in detail. [Pg.846]

See other pages where The Chemistry of Lignin and its Removal is mentioned: [Pg.26]    [Pg.27]    [Pg.29]    [Pg.31]    [Pg.33]    [Pg.35]    [Pg.37]    [Pg.39]    [Pg.41]    [Pg.43]    [Pg.45]    [Pg.47]    [Pg.51]    [Pg.26]    [Pg.27]    [Pg.29]    [Pg.31]    [Pg.33]    [Pg.35]    [Pg.37]    [Pg.39]    [Pg.41]    [Pg.43]    [Pg.45]    [Pg.47]    [Pg.51]    [Pg.26]    [Pg.9]    [Pg.440]    [Pg.642]    [Pg.295]    [Pg.743]    [Pg.21]    [Pg.75]    [Pg.19]    [Pg.387]    [Pg.21]    [Pg.284]    [Pg.416]    [Pg.22]   


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