Processes for producing citrate esters

Details Processes for producing citrate esters Processes for producing citrate esters

C - Chemistry, Metallurgy

07

C

C07C 69/34 (2006.01) C07C 67/08 (2006.01)

Patent

CA 2290092

Described are processes for producing citrate esters in an economic fashion. Esters are prepared by esterification of a citric acid-containing fermentation broth having been treated to remove cations and optionally other impurities, but containing sugar(s). Esters are also prepared by reacting an impure aqueous citric acid source with an alcohol to provide a heterogeneous acqueous/organic reacted mixture, wherein the organic phase contains the ester and the acqueous phase retains water-soluble impurities. A liquid phase separation is then used to separate the organic and aqueous phases, conveniently separating the impurities from the product and avoiding the energy-intensive distillation of water from the reaction medium.

La présente invention concerne des procédés permettant de produire des esters de citrate de façon économique. On prépare les esters par estérification d'un bouillon de fermentation contenant de l'acide citrique qui a subi un traitement destiné à en enlever les cations et, facultativement, d'autres impuretés, mais qui contient du/des sucre(s). On prépare également les esters en mettant à réagir une source d'acide citrique aqueuse impure et un alcool afin d'obtenir un mélange de réaction hétérogène aqueux/organique, dans lequel la phase organique contient l'ester et la phase aqueuse retient les impuretés hydrosolubles. Une séparation de phase liquide permet ensuite de séparer les phases organique et aqueuse et, ce faisant, de séparer sans inconvénient les impuretés du produit tout en évitant la grande consommation d'énergie que requiert la distillation de l'eau à partir du milieu de réaction.

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