The Chemistry of Bromination of Wood IV. Main Features of the Reaction of Picea excelsa with Aqueous Bromine at Low pH and Low Bromine Concentrations

Jacob Zabicky

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Spruce wood meal treated with aqueous bromine at concentrations under 0.002 M per each g/1 of wood showed an uptake proportional to the initial bromine concentration, where approximately one third of the bromine becomes attached to the wood, while the rest is converted into hydrobromic acid, which remains in solution. The above mentioned bromine concentration constitutes a threshold for this behaviour. Temperature had no influence between 15 and 35° C. No marked differences in behaviour were observed for unextracted, ethanol-benzene-water extracted and ethanol-benzene-water-alkali extracted meals. The influence of added sodium bromide was also studied. Results were interpreted as stemming from a diffusion-controlled process where the most important reactions are “substitution”- and “oxidations-like, that is, reactions where one and two molecules of hydrobromic acid are produced respectively per molecule of bromine consumed. At low bromine concentrations a maximum uptake of one bromine atom per aromatic ring of lignin was observed.

Original languageEnglish
Pages (from-to)158-162
Number of pages5
JournalHolzforschung
Volume24
Issue number5
DOIs
StatePublished - 1 Jan 1970
Externally publishedYes

ASJC Scopus subject areas

  • Biomaterials

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