Process for obtaining highly esterified polyol fatty acid...

C - Chemistry – Metallurgy – 07 – H

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C07H 13/06 (2006.01) C07C 67/02 (2006.01) C07C 69/58 (2006.01) C08G 63/48 (2006.01)

Patent

CA 2089390

An improved. solvent-free, two-stage transesterification process for preparing, from a polyol and fatty acid esters of an easily removable alcohol. highly esterified polyol fatty acid polyesters having reduced levels of difatty ketones and .beta.-ketoesters is disclosed. These reduced levels of difatty ketones/.beta.-ketoesters are achieved by controlling the level of generated alcohol in the liquid phase of the reaction mixture and heating the reaction mixture to certain temperatures during the second stage of this improved process. Other optional reaction conditions, such as keeping the molar ratio of fatty acid esters to polyol within a specified range and reducing the level of basic catalyst, can also be used during the second stage reaction to further reduce the level of difatty ketones and/or .beta.-ketoesters.

Divulgation d'un procédé amélioré de transestérification en deux étapes, sans solvant, pour préparer, à partir d'un polyol et d'esters d'acides gras et d'un alcool facilement remplaçable, des polyesters de polyol et d'acide gras, hautement estérifiés, contenant des taux réduits de cétones grasses diacides et de bêta-cétoesters. Ces taux réduits de cétones grasses diacides/de bêta-cétoesters sont obtenus en contrôlant le niveau d'alcools produits dans la phase liquide du mélange réactionnel et en chauffant ce mélange réactionnel à certaines températures au cours de la deuxième étape de ce procédé amélioré. D'autres conditions expérimentales facultatives, comme le fait de maintenir le rapport des fractions molaires des esters d'acides gras et de polyol dans une gamme spécifique ou de réduire la quantité de catalyseur de base, peuvent aussi être appliquées au cours de la deuxième étape de la réaction, afin de réduire davantage le taux de cétones grasses diacides ou de bêta-cétoesters, ou des deux.

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