FIELD: chemistry.
SUBSTANCE: invention relates to a method of treating wood oil, particularly tall oil. The method of treating wood oil, which contains fatty acids, sterols and compounds with alcohol groups, in order to increase output of fatty acids and make easier further treatment of sterols, where said wood oil is formed during sulphate pulping of fibrous raw material, is characterised by that a low molecular weight carboxylic acid is added to the wood oil in amount of about 0.5-5.0% of the weight of the wood oil before a considerable number of alcohol groups are esterified by fatty acids initially contained in the wood oil, for esterification using said acid of at least some of the alcohol groups present in the wood oil, and for significant prevention of esterification of said alcohol groups by fatty acids initially contained in the wood oil.
EFFECT: invention increases output of fatty acids and makes easier further treatment of sterols.
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