Synthèse d'acide azélaïque à partir d'huile végétale pour la précipitation sélective de cations métalliques

Abstract : Each year in France, surface finishing industry generates about 200.000 tons of metallic sludges without any possibility of beneficiation. Selective precipitation of metallic cations can be carried out by Azelaic acid. Vegetable oils are an important source of unsaturated fatty acids, especially oleic acid. The oxidation of this acid leads to two saturated carboxylic acids, nonanoic and azelaic acid. Chapter one presents the actual situation of vegetable oil production and oxidations process of unsaturated fatty acids. Then precipitation methods of metallic cations are described. Chapter two describes the azelaic acid synthesis from oleic acid with RuCl3/NaIO4 catalytic system. Toxic solvent CCl4 can be removed and oxidation can even be succeed in water. Azelaic acid is easily purified in water too. This new process is extend to other olefins. Chapter three described the preparation, purification and characterisation of some metallic azelates. Solubilities diagrams versus pH show that separation of metallic cation mixtures is possible. Chapter four studies the specific azelate iron(III) precipitation first, then the separation of FeIII-ZnII by sodium azelate. 99,9 % of iron are recovered without embedding more than 2,1 % of zinc. Finally, the precipitation by azelate/nonanoate mixture indicates that a particular compound is formed.
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François Zimmermann. Synthèse d'acide azélaïque à partir d'huile végétale pour la précipitation sélective de cations métalliques. Autre. Université Paul Verlaine - Metz, 2005. Français. ⟨NNT : 2005METZ023S⟩. ⟨tel-01752384⟩

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