Method for regeneration of a raw ester

C - Chemistry – Metallurgy – 07 – C

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C07C 67/58 (2006.01) C07C 69/00 (2006.01) C07C 69/80 (2006.01)

Patent

CA 2744130

The invention relates to a raw ester of an esterification reaction catalyzed by a metal-containing esterification catalyst regenerated by a) mixing the raw ester at a temperature T of more than 100°C under a pressure p that is equal to or greater than the vapor pressure of water at the temperature T with an aqueous base, b) relaxing the ester-base mixture and evaporating water, c) mixing the obtained fluid phase with water forming a water-in-oil emulsion, d) distilling water out of said emulsion and e) filtering the ester. Said method results in esters having low acid value and residues accrue in easily filterable form in the solid catalyst residues.

L'invention concerne le traitement d'un ester brut résultant d'une estérification catalysée au moyen d'un catalyseur d'estérification contenant du métal, ce traitement consistant à a) mettre à réagir l'ester brut avec une base aqueuse à une température T supérieure à 100° C sous une pression p qui est supérieure ou égale à la pression de la vapeur d'eau à la température T, b) détendre le mélange ester-base et faire évaporer l'eau, c) mettre à réagir la phase liquide obtenue avec de l'eau pour obtenir une émulsion eau dans huile, d) évacuer l'eau de l'émulsion par distillation et e) filtrer l'ester. Ce procédé permet d'obtenir des esters à faible indice d'acide et les résidus de catalyseur solides se présentent sous forme aisément filtrable.

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