Lower alkyl ester recycling in polyol fatty acid polyester...

C - Chemistry – Metallurgy – 07 – H

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C07H 13/06 (2006.01) C07H 3/06 (2006.01)

Patent

CA 2279381

Process for synthesizing polyol fatty acid polyesters which includes the steps of reacting an excess of lower alkyl ester with polyol to esterify hydroxyl groups thereof and form polyol fatty acid polyester, separating at least a portion of the unreacted lower alkyl ester from the polyol fatty acid polyester, and recycling the separated unreacted lower alkyl ester for further reaction with polyol or partially esterified polyol. The recycled lower alkyl ester is substantially free of lower alkyl ester degradation reaction products, such as carbonyls and free fatty acids.

L'invention concerne un procédé destiné à synthétiser des polyester d'acides gras de polyol, qui comporte les étapes consistant à faire réagir une quantité excédentaire d'ester d'alkyle inférieur avec un polyol pour estérifier des groupes hydroxyle de celui-ci et former un polyester d'acides gras de polyol; séparer au moins une partie de l'ester d'alkyle inférieur inutilisé dans la réaction, du polyester d'acides gras de polyol; et recycler l'ester d'alkyle inférieur inutilisé dans la réaction en vue d'une réaction ultérieure avec un polyol ou un polyol partiellement estérifié. L'ester d'alkyle inférieur recyclé est sensiblement exempt de produits de réaction résultant de la dégradation d'ester d'alkyle inférieur, tels des carbonyles et des acides gras libres.

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