Chemistry of Natural Compounds

, Volume 6, Issue 5, pp 532–535 | Cite as

Oxidation of lignin in aqueous alkaline solution

  • V. E. Bronovitskii
  • L. L. Kalinskaya


The hydrogenolysis and hydrolysis of lignin in an aqueous alkaline medium must be considered as an oxidative degradation of the lignin macromolecule by hydroxyl radicals. This process takes place even in a reducing medium in the presence of a catalyst. This was shown by a study of the hydrogenolysis process using model compounds. The oxidative processes in lignin are connected with the appearance in the system (lignin or its model) of alkali-induced quinoid structures which, being electron-acceptors, abstract electrons from hydroxyl ions and form hydroxyl radicals. The latter lead to oxidative processes through the the hydroxylation of the system. The correctness of this has been confirmed by studying the composition of the products, which shows the oxidative nature of the hydrogenolysis process.


Methyl Orange Phenol Fraction Ethylphenol Aqueous Alkaline Medium Caustic Soda Solution 


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Copyright information

© Consultants Bureau, a division of Plenum Publishing Corporation 1973

Authors and Affiliations

  • V. E. Bronovitskii
  • L. L. Kalinskaya

There are no affiliations available

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