Abstract
BLEACHING of lignocellulosic materials with chlorine gas or with hypochlorous acid has been shown, in the case of unbleached wood-pulp1, to take place through a series of reactions involving chlorination, demethoxylation and oxidation of the lignin. The reaction products are of relatively small molecular weight and are readily soluble in solutions of sodium sulphite. The rate of bleaching appears to depend upon the presence of the free phenolic or enolic hydroxyl group, known to exist in lignin, for Brauns2 has shown, in the case of unbleached wood-pulp, that when this is blocked by a methoxyl group the rate of reaction of the lignin with a bleaching solution is greatly reduced.
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References
White, E. V., Swartz, J. N., Peniston, Q. P., Schwartz, H., McCarthy, J. L., and Hibbert, H., Tech. Assoc. Pap., 24, 179 (1941).
Brauns, F. E., Paper Trade J., 103, 36 (1936).
Callow, H. J., Nature, 159, 309 (1947).
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CALLOW, H. Bleaching Reactions with Jute Fibre. Nature 166, 1040 (1950). https://doi.org/10.1038/1661040a0
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DOI: https://doi.org/10.1038/1661040a0
