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Información tecnológica

On-line version ISSN 0718-0764

Abstract

GUAJARDO, Nadia; SANTANA, Jorge  and  CARLESI, Carlos. The Use of an Ionic Liquid Catalyst for the Oxidation of Hydrophobic High Molecular Weight Alcohols. Inf. tecnol. [online]. 2010, vol.21, n.3, pp.57-65. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642010000300007.

Catalytic batch oxidation runs of an hydrophobic high molecular weight alcohol (docosanol) to the acid were performed using a functionalized ionic liquid composed by an Aliquat®336 cation and a polyperoxometalate {PO4[WO(O2)2]4}3- anion as a catalyst. The active oxygen is efficiently transferred by the catalyst from the aqueous to the alcoholic phase in accordance with an experimentally validated reaction scheme. Only the hydrogen peroxide was used effectively as an oxidant, giving an 81 % conversion and a 55% yield after 6 hours at 90ºC, with a H2O2/alcohol molar ratio that equal 3 and an alcohol/catalyst mass ratio that equal 100. The calculated kinetic constants, at 90ºC, for the docosanol oxidation to the aldehyde intermediate and the further oxidation towards docosanoic acid were 0,26 and 1,3 L mole-1 h-1, respectively.

Keywords : catalysis; docosanol; docosanoic acid; Aliquat ionic liquid; biphasic reaction.

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